TSASK
TECHNICAL SAFETY AUTHORITY
O F S A S K AT C H E WA N
GAS INSPECTIONS


2020 Gas Contractor Presentation
CSA B149.3-20


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This presentation will cover the
substantial changes to the following
codes:
• CSA B149.3-20 Code for the field approval of
  fuel-burning appliances and equipment
  (purchase from https://store.csagroup.org)
• 2020 Saskatchewan Codes of Practice to CSA
  B149.3-20, (www.tsask.ca under Gas/Act &
  Regulations/Gas Codes )
    including:
    • SCOP changes caused directly by changes to
      the 2015 CSA B149.3
    • SCOP changes warranted due to experience

                         Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances - Color Coding
in this Presentation
               • White background slides refer to the national code.



               • Light blue background slides refer to the Saskatchewan
                 Codes of Practice.


               • Light grey background slides are issues specific to
                 good design and workmanship


                                                             Inspiring and Shaping Excellence in Public Safety
B149.3-20 Field Approval of Fuel-Burning Appliances
Saskatchewan Codes of Practice 2020


                      In this presentation, the slides with
                      a light blue background will refer to
                      these Codes of Practice for
                      Saskatchewan.



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What are the Saskatchewan Codes of Practice?
• Collection of requirements and interpretations that are unique to
  Saskatchewan.
• Formed by:
  • amending clauses in the national code;
  • adding wording, illustrations or charts to clarify national code
    requirements; or
  • adding new clauses addressing specific issues unique to the
    Saskatchewan environment.

                                                       Inspiring and Shaping Excellence in Public Safety
Scope of this Presentation
2020 CSA code overview
• The Δ Delta Symbol (previously used to identify changes in the CSA
  codes) is no longer used by CSA.
• We will only be covering those clauses having a substantial technical
  change.
• We will cover only the technical changes to the Saskatchewan Codes
  of Practice.
• These codes will be enforced on all permits received May 1, 2021 &
  after.

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Scope of this Presentation
• The items addressed in this presentation are only to identify
  substantial technical changes to the Canadian Code and the
  Saskatchewan Codes Of Practice.
• For example – the next slide shows some of the changes made to the
  code to combine or reorganize requirements in a more logical order,
  but the technical requirements remain the same.
• You are strongly encouraged to review the 2020 Code and
  Saskatchewan Codes of Practice in their entirety.


                                                       Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances
Reorganization of clauses without technical change:
                CSA B149.3-15 Clauses                     CSA B149.3-20 Clauses
      4.1.1 - 4.1.2 - 4.1.3                   5.1 - 10.1.7
      4.1.4                                   5.2
      4.2.2 - 4.2.3 - 5.5.2 - 4.6.4 - 5.5.3   6.2
      4.6.1 - 4.6.2 - 5.5.1                   6.4 - 6.5
      4.7.2                                   7.2.2
      4.1.2                                   10.1.7 - 5.1
      7.4 – 5.7.1                             10.4.1 – 10.4.2 – 10.4.3




                                                                           Inspiring and Shaping Excellence in Public Safety
This presentation will proceed
through the substantial changes
to CSA B149.3-20 and will jump
to the resulting changes to the
Saskatchewan Code of Practice
to B149.3 (slides with a light
blue background) as these areas
come up.


                Inspiring and Shaping Excellence in Public Safety
Please note that in this presentation:
• Clauses with major revisions will be shown in
   normal type.
• Words added into a clause will be shown bold and
   underlined.
• Words deleted from a clause will be shown
   strikethrough in red .
• Comments (like these) will be in italic type with
   blue highlighting




1 Scope
                              Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances - Scope
1.5
The requirements contained in this Code apply
(a) to new non-certified appliances and equipment of all inputs for which there is no
    approved Standard;
(b) when the upgrading, conversion or changes to the control system of a certified or
    non-certified appliance is required; and
(c) to programmable logic controllers or microprocessor-based controls used for flame
    safety and fuel air ratio control.
This change is to clarify that this Code can be used on new certified appliances. For
example: a new certified unit purchased with the expectation of utilizing one particular
fuel and then that fuel not being available, or changes to the control system such as
reverting to single point positioning as opposed to parallel positioning.
                                                                Inspiring and Shaping Excellence in Public Safety
3 Definitions
                Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances - Definitions
Please refer to the code to review the following new definitions:
Burner -Self-Piloted                                 Portable Appliance/Equipment
Complex and integrated facility                      Protected inlet pressure
Engine                                               Proven low fire start
Field approval                                       Safe Location
Flame front generator                                Safety Relay
Flare                                                Turbine
Flare pilot
Locally ignited flare pilot
Locally ignited flare pilot
Flare pilot automatic ignition system
Flare pilot manual isolation valve
Fuel
Non aerated raw gas burner                                                  Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances - Definitions

Protected Inlet Pressure (New definition)
the maximum inlet pressure to a pilot or main pressure regulator caused by
a failure of a single upstream pressure regulator.

New SCOP –Definitions
Protected Inlet Pressure
the maximum inlet pressure to any component of a gas piping system, caused by a
failure of a single upstream pressure regulator, and as limited by the setpoint and
capacity of an overpressure protection device.


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B149.3-20 – Field Approval of Fuel-Burning Appliances - Definitions
Old definition Valve train (2015)
the combination of valves, controls, piping, and tubing of an appliance upstream from
the manifold through which gas is supplied to the appliance and by which gas is
controlled.

New definition Valve train (2020)
all gas confining valves, controls, piping, fittings, and hoses of an appliance
downstream of the manual shut-off valve specified in Clause 6.18.2 of the CSA B149.1
to the inlet of the burner.




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4 Pressure Regulators
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B149.3-20 – Field Approval of Fuel-Burning Appliances – Pressure Regulators

The 2015 Sections
• 4.3 Pressure regulators and
• 5.2 Pressure regulators
Have been relocated and combined into:

2020 Section
• 4 Pressure regulators

The requirements have been relocated and combined to improve logical sequence of
requirements.

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B149.3-20 – Field Approval of Fuel-Burning Appliances – Pressure Regulators

5.2.3 4.4
The pressure regulator shall be capable of maintaining an outlet pressure to within
10% 20% above or below the regulator set pressure during burner operation from
minimum to maximum firing rates.



To match actual feasibility




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7 Pilot Safety Shut-off
  Valves and Burner
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B149.3-20 – Field Approval of Fuel-Burning Appliances – Pilot SSV’s and Burner
(4.7.2 becomes 7.2.2)
7.2.2
A pilot shall be designed, installed, and adjusted to ensure provide safe and reliable
ignition of the main burner and that there will be no injurious flame impingement on
heating surfaces that can cause incomplete combustion or damage to these surfaces.

Previous Clauses 4.7.6, 4.7.7, and 4.7.8 are deleted

The requirement for pilots to be large enough to ensure safe and reliable ignition
conflicts with the previous clauses that dictated the maximum input of the pilot based
on a percentage of the input to the main burner. The safe and reliable ignition
requirements for pilots apply to all appliance inputs.
                                                                Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Pilot SSV’s and Burner
7.2.7 (new)
A pilot burner shall maintain stability of the designed flame shape, with neither
flashback nor blow-off, over the entire burner firing range. In addition, a pilot
turndown test, or similar method, shall be conducted to prove that the pilot is capable
of reliably lighting the main burner in credible firing conditions.

Rationale:
“A pilot should have to meet the same requirement as a main flame, and a pilot
turndown test is a critical part of assessing the pilot burner`s ability to consistently light
the main flame smoothly.”



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B149.3-20 – Field Approval of Fuel-Burning Appliances – Pilot SSV’s and Burner

7.3 Self-Piloted Burner (new)
The pilot portion of a self-piloted burner shall meet the requirements contained in
Clause 4 to Clause 7 and Clause 10 and all applicable clauses where the term pilot is
used…



Rationale:
To provide clear support in the code for self-piloted burners
(a.k.a. “slip-stream pilot” burners).

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8 Main Safety Shut-off
  Valves, Input Flow Control
  Systems and Main Burners
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B149.3-20 – Field Approval of Fuel-Burning Appliances – Main SSV’s and Burner
(5.3.1 becomes 8.1.1 and 5.3.4 becomes 8.1.4)
8.1.1 A safety shut-off valve shall
(a) for input ratings up to and including 200 000 400 000 Btu/h ….;
(b) for input ratings in excess of 200 000 400 000 Btu/h ….;
8.1.4 A single burner appliance that has a rated input up to and including 200 000 400 000
Btu/h ….;
In 2015, the code incorrectly lowered the capacity of a combination control valve from 400,000
btu/h to 200,000 btu/hr. This change is a correction back to 400,000 btu/h as written in 2010.

Deleted SCOP –No longer required
5.3.1 –5.3.4 –5.3.5
These SCOPs to the 2015 edition provided the correct 400,000 btu/hr capacity for a
combination control valve in Saskatchewan.
                                                                     Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Main SSV’s and Burner

[adding subsections (f) and (g)]
8.1.1 A safety shut-off valve shall
(f) not be bypassed except as required for operation of an approved valve proving
    system (VPS); and
(g) when more than one valve is required, be wired in parallel except as required for
    operation of an approved valve proving system (VPS).




                                                                Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Main SSV’s and Burner
(5.6.5 becomes 8.3.5)
8.3.5 When a manually adjusted combustion airflow controlling device is provided on a
burner, it shall be
(a) capable of any desired adjustment to provide sufficient air for the combustion
    process;
(b) provided with a means to prevent an unintentional change in setting;
(c) constructed and mounted such that air leakage is minimized; and
(d) accessible for service and adjustment.
Whether the combustion airflow controlling device is manually or automatically
controlled, the same requirements should apply.
                                                                Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Main SSV’s and Burner
(5.6.6 becomes 8.3.6)

8.3.6 When a combustion airflow controlling device on a burner is operated
automatically, it shall
(a) comply with the requirements of Clause 8.3.5; and
(b) be designed to provide maximum airflow mitigate hazardous conditions upon
    failure of its operating mechanism.

Some applications could result in a hazard if the airflow goes to maximum upon failure
of the operating mechanism. The change keeps the original intent of calling attention
that failures in the mechanism could lead to an unsafe state.


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B149.3-20 – Field Approval of Fuel-Burning Appliances – Main SSV’s and Burner
(5.6.15 becomes 8.3.15)
8.3.6 Where a non-aerated raw gas burner is used, a differential airflow an airflow
proving device shall be provided to measure differential pressure across the profile
plates to ensure combustion air velocity is within the minimum and maximum limits
specified by the burner manufacturer over the full range of operation. The airflow
proving device shall be
(a) connected electrically in series in the safety limit control circuit; and
(b) set to automatically shut down the burner where the limits specified by the burner
    manufacturer are exceeded.

Clause 5.6.15 was too specific on the air flow proving device requirements.


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9 Additional Requirements for
  Liquid Propane Valve Trains
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B149.3-20 – Field Approval of Fuel-Burning Appliances – Propane Valve Trains

(6.1 becomes 9.1)
9.1
All piping shall be Schedule 80 or heavier, flanges shall be minimum Class 150 and all
other fittings shall be minimum Class 300.

Deleted SCOP –No longer required
6.1.1
All fittings on schedule 80 valve train systems shall be
minimum Class 300.


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B149.3-20 – Field Approval of Fuel-Burning Appliances – Propane Valve Trains
(6.5 becomes 9.5)
9.5 Where dictated by the valve train design, the liquid propane regulator may be located
immediately upstream of the test firing valve or may be omitted when the supply
pressure to the burner valve train is required to be greater than tank pressure and is
being controlled by a pump system equipped with a differential bypass valve and
backpressure regulator suitable for use with LPG. Setpoints of the differential bypass
valve and backpressure regulator shall be in accordance with the burner manufacturer’s
installation instructions.

The pressure control requirements for different types of liquid burners include those which many not
want diaphragm type or lock up type regulators used on the fuel train at all. They may require the use of
pumps at the tank location and recommend the use of a backpressure regulator used in conjunction with
a differential bypass regulator, both installed at the pump location. The design of these burners is such
that they need to maintain a set pressure over tank pressure.
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10 Applications
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B149.3-20 – Field Approval of Fuel-Burning Appliances – Applications
(7.1.7 becomes 10.1.6)
7.1.7 When a filter is used on a gas valve train, a low-pressure or high differential
pressure indicator shall be installed directly downstream of the filter.
10.1.6 When a 250 or less micron gas strainer or a 60 mesh or larger filter is used on a
gas valve train, a low-pressure indicator or switch shall be installed downstream of the
filter/ strainer or a high differential pressure indicator or switch shall be installed across
the filter.

The new language allows low gas pressure switches to be used and clarifies where the
differential type indicator is to be installed. When filters are strainers are removing large debris
(e.g. gravel, large sand particles), there is no need for a low pressure indicator, or a differential
pressure indicator, on or across the strainer or filter.
                                                                          Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Applications
(new)
10.1.6 When piping is used to construct a valve train, a minimum of schedule 40 shall
be used.

B149.1 now allows the use of schedule 10 piping for the gas piping system.
(Joints must use a press-connect style of fitting.)
Valve trains, however, must use schedule 40 piping at minimum, because the continual
need for maintenance and replacement of the controls requires either threaded or
flanged connections, and cannot be accommodated using press-connect fittings.


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B149.3-20 – Field Approval of Fuel-Burning Appliances – Applications
(7.2 becomes 10.2)
10.2
Unions or flanges shall be installed on valve trains for maintenance and replacement of
components. A raised-face flange shall connect to a raised-face flange of the same
Class. A flat-faced flange shall connect to a flat-faced flange of the same Class.

Deleted SCOP –No longer required
7.2.1
A raised-face flange shall connect to a raised-face flange.
A flat-faced flange shall connect to a flat-faced flange.

                                                                Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Applications
(7.3.1 becomes 10.2)
7.3.1 Pressure test points not exceeding NPS 1/4 shall be provided to allow testing of
the valve train components and the set-up of the burner.
10.2 The opening for pressure test points shall be orificed 1/4” NPS maximum and shall
be provided to allow testing of the valve train components and the set-up of the
burner.



A ¼" nipple (even though it is minimum schedule 80 by code) can be bent or broken in
industrial applications. This wording still allows a ¼” nipple to be used, but it is also
acceptable to use a ½" nipple with a ¼" maximum orifice as an option.
                                                                  Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Applications
(5.7.3 becomes 10.4.5)
5.7.3 ….. Note: A token relief valve should not be used as a full capacity relief valve.
SCOP 5.7.3.1 - A token relief valve shall not be used as a full capacity relief valve.


10.4.5 …..
A token overpressure relief device shall not be used as a full capacity overpressure relief device.


A note in a clause in the code is a non-mandatory observation or recommendation. A note in a
Table in the code is a mandatory part of the code as an extension or explanation of the Table.
This revision ensures that a token relief valve shall not be used as an OPD, and the
Saskatchewan Code of Practice statement is no longer required.
                                                                          Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Applications

(7.6 becomes 10.6)

7.6 Bleed vents for valves, combination controls, pressure regulators, relief valves,
and other control devices

10.6 Atmospheric and bleed vents for valves, combination controls, pressure
regulators, relief valves, and other control devices

The Scope of section 10.6 now covers atmospheric vents as well as bleed vents.


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B149.3-20 – Field Approval of Fuel-Burning Appliances – Applications
(7.9.2 becomes 10.9.2)
10.9.2
An electrically heated compartment intended to house controls and valves in
accordance with Clause 7.9.1 shall be of non-combustible construction and shall be
heated to maintain a temperature within the compartment of at least 18°F (10 °C)
higher than the highest minimum (low) ambient rating of any control within the
compartment, taking into account the possible effects of wind, snow and ice, if the
equipment is intended for use outdoors.

The clause applies to all heated compartments, regardless of the source of heat.


                                                                Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Applications
(new)
10.9.3 A heated compartment shall be equipped with a low limit temperature control
that will operate and be interlocked with the flame safeguard to positively prevent
operation of the fuel burners if the temperature within the heated compartment for
any reason drops 18°F (10°C) below the value specified in Clause 10.9.2.
10.9.4 The low limit temperature control required by Clause 7.9.3 shall be of the
automatic recycling type.

For example, Clauses 10.9.1 and 10.9.2 allow a valve with a minimum rating of 0°C to be housed
in a hot-box heated to at least +10°C. If the hot box internal temperature drops to 0°C, an
unlatched control is required to lock out the burners until the +10°C internal temperature is
restored.
                                                                    Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Applications
(new) 10.11 Multi-fuel burners
When a dual or multi fuel burner has fuel trains that connect for the purpose of using the same exit
holes on the burner for combustion, unless the design is such that it prevents the alternate fuel/s
from back feeding through the alternate fuel train/s, suitable means shall be provided to prevent
back feeding. Manual shut-off valve or safety shut-off valves, with end switches wired into the limit
circuit to allow operation of the alternate fuel when closed, or back pressure check valves may be
used as an acceptable solution. These valves, when used shall be installed as close as practicable to
the point of interconnection.
Note: The test firing valve required by clauses 4.6.1 and 5.5.1 may be used when equipped with end
switches to prove closure.

2015 SCOP No Longer Required
9.5.3.1-When propane is one of the fuels used on a multi-fuel appliance, a check valve shall be
installed to restrict the flow of any other gas into the propane piping from the propane container.
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12 Safety Controls
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B149.3-20 – Field Approval of Fuel-Burning Appliances – Safety Controls
(9.1.4 becomes 12.1.4)
12.1.4
Intermediate relays may be used in the limit circuits, provided that each intermediate
relay serves only one safety interlock. Each intermediate relay shall be rated for at
least 100,000 cycles or the number of cycles of its associated safety interlock
component, whichever is greater.

A General Purpose relay could be certified for 6 000, 30 000 or 100 000 cycles. The use of a less
reliable relay could lead to a hazard that could be easily avoided. CSA C22.2 NO. 24 –
“Temperature indicating and regulating equipment” requires automatic reset limiters to be
certified to 100,000 cycles, so the relay associated needs to also be certified to 100,000 cycles
for reliability of the system.

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B149.3-20 – Field Approval of Fuel-Burning Appliances – Safety Controls

(new)
12.1.5
When the combustion safety control system is not suitably rated for the electrical load
of the safety shut-off valves, an intermediate safety relay circuit shall be used.

Added coverage for this situation which happens frequently with large diameter valving
systems.




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B149.3-20 – Field Approval of Fuel-Burning Appliances – Safety Controls
(9.4.1 becomes 12.4.1)
12.4.1
An appliance that heats a liquid or vapor shall be equipped with all of the following fuel supply shut off
safety devices as required for safe operation of the appliance. The safety devices shall include a
manual-reset feature or shall require operator attention before resuming operation:
(a) low liquid level …
(b) low liquid or vapor flow …
(c) high fluid temperature;

Note: Where portions of the appliance are sufficiently independent,
multiple temperature sensors might be required;
(d) High fluid pressure…


(continued next slide…)                                                       Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Safety Controls
(9.4.1 becomes 12.4.1)
12.4.1
An appliance that heats a liquid or vapor shall be equipped with all of the following
fuel supply shut off safety devices as required for safe operation of the appliance. The
safety devices shall include a manual-reset feature or shall require operator attention
before resuming operation: ………
(e) high steam pressure for a steam boiler with a maximum rated input of less than
    12.5 MMBtu/h;
(f) high steam pressure for a steam boiler with a maximum rated input greater than
    or equal to 12.5 MMBtu/h in unattended operation; or and
(g) low water level in a water boiler located above the hot-water circulating system.

Added coverage for steam boiler pressure safeties.
                                                                Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Safety Controls
(9.5.3 becomes 12.5.3 and remains unchanged with a Note added)

12.5.3 When a gas pilot is used on a multi-fuel appliance, a low gas pressure safety device shall be
installed in the gas pilot supply immediately upstream of the first safety shut-off valve. When the pilot is
firing, the low gas pressure safety device shall be in service and shall
(a) shut down the pilot in a low gas condition; or
(b) shut down the main burner in a low gas condition if the pilot is required for stable main burner
    flame.
If the pilot is an interrupted pilot, this device may be removed from service at the completion of the pilot
run time.
Note: A low gas pressure safety device would not be required if the pilot is protected by the main fuel
low gas pressure safety device.

It was not previously clear that the pilot PSLL is only required when a different gas than the main gas is
used for the pilot.
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B149.3-20 – Field Approval of Fuel-Burning Appliances – Safety Controls
(new)
12.5.5
The low gas pressure safety device and high gas pressure safety device shall be of the
manual reset type or operator attention shall be required before resuming operation.

Previously, the manual reset function was only required in Clause 13 Additional requirements
for process ovens, process furnaces, and atmosphere generators.
CSA boiler codes (3.1 and 4.9) require pressure devices to cause a safety shutdown. All new
boilers are shipped with manual reset function.
All LP & HP devices must now be latched controls. An unlatched trip will require a separate
setpoint approaching the latched setpoint.

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B149.3-20 – Field Approval of Fuel-Burning Appliances – Safety Controls
12.7 Programmable controllers
This section is of vital importance for designers of programmable controllers to review
in its entirety.

Revisions to 9.6.1 for clarity, becomes 12.6.1 (also see 12.1.2)

Revisions to 9.7.2.3.1, 9.7.2.3.2, and 9.7.2.3.3
to become 12.7.2.3.1, 12.7.2.3.2, 12.7.2.3.3 and new 12.7.2.3.4
are based upon the general philosophy that it is permissible to bypass a redundant
input device, but it is not permissible to bypass a tripping function.


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14 Rating Plate
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B149.3-20 – Field Approval of Fuel-Burning Appliances – Rating Plate
14 Rating plate
An appliance shall have a clearly legible permanent rating plate that shall include the following
information:
a) manufacturer’s or vendor’s name;
b) appliance type and identification number;
c) electrical specifications;
d) type of fuel(s);
e) maximum input rating in Btu/h (kW) and design altitude in ft (m);
f) minimum inlet pressure and maximum protected inlet pressure at the point of connection;
g) maximum and minimum burner manifold fuel pressure; and
h) a statement identifying if it is portable.

To support the new section for portable appliances and equipment, Section 20.
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16 Additional Requirements for
   Process Ovens, Process
   Furnace and Atmosphere
   Generators
                Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Additional
Requirements for Process Ovens, Process Furnaces and Atmosphere Generators

(new)
16.1 Scope
16.1.1
This Clause is intended for appliances used in commercial and industrial processing
application (e.g.: heating treating of metal in a hydrogen atmosphere).




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B149.3-20 – Field Approval of Fuel-Burning Appliances – Additional
Requirements for Process Ovens, Process Furnaces and Atmosphere Generators
(new) 16.1.2
Clause 16 does not apply to appliances in a facility whose main business activity meets the definition of one of the following North
American Industry Classification System (NAICS) Canada 2017 Version 1.0 codes:
• Code 21111 (Oil and gas extraction)
• Code 21114 (Oil sands extraction)
• Code 32411 (Petroleum refineries)
• Code 32511 (Petrochemical manufacturing)
• Code 32519 (Other basic organic chemical manufacturing)
• Code 32521 (Resin and synthetic rubber manufacturing)
• Code 32531 (Fertilizer manufacturing)
• Code 32532 (Pesticide and other agricultural chemical manufacturing)
• Code 32599 (All other chemical product manufacturing)
Note: Due to the nature and process of petroleum refining, some of the requirements in Clause 16 can create hazards for the
refining process. Designers typically identify any operating requirements that are needed in addition to Clauses 1 –15 of this Code.
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17 Generators, Compressors /
   Pressure Boosters, Engines
   and Turbines
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B149.3-20 – Field Approval of Fuel-Burning Appliances – Generators,
Compressors/Pressure Boosters, Engines and Turbines
      CSA B149.1-15 Clauses            CSA B149.3-20 Clauses
             7.2.1.1                           17.1.1
                                                                                          Compiled
             7.2.2.3                           17.2.1
                                                                                     requirements from
             7.2.2.9                           17.2.3                               the previous edition
             7.2.2.11                          17.2.4                                   of CSA B149.1
         7.2.4.2 / 7.2.4.3       Compiled as 17.3.2 / 17.3.3 / 17.3.5                     positioned
             7.2.4.5                           17.3.6                               downstream of the
             7.2.4.6                           17.3.7                                 appliance manual
             7.2.4.7                           17.3.8                                  shut-off valve.
             7.2.4.8                           17.3.9
             7.2.4.9                            17.5

                                                                        Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Generators,
Compressors/Pressure Boosters, Engines and Turbines

(B149.1-15 7.2.2.6 becomes B149.3-20 17.2.2)

17.2.2
A compressor shall be isolated from vibration at the inlet or outlet by a flexible metallic
gas hose certified to the requirements of CAN/CSA-8.1, CAN/CSA-8.3, ULC/ORD C536,
or CGA CR96.

To expand the list of acceptable hose certifications.



                                                                  Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Generators,
Compressors/Pressure Boosters, Engines and Turbines
B149.1-15 7.2.4.2 / 7.2.4.3
7.2.4.2 required an engine or turbine to be equipped with a) a 6.5 C/I safety shut-off valve, b) an
automatic speed governor, c) a vacuum or LP switch, d) a zero governor regulator, and e) a gas hose.
7.2.4.3 required an engine or turbine over 1 million btu/hr to be equipped with a second safety shut-off
valve.

becomes B149.3-20 17.3.2 / 17.3.3 / 17.3.5
17.3.5 covers requirements for an engine or turbine over 12.5 million btu/hr with inlet pressures greater
than 150 psi.
17.3.3 covers safety shut-off valve requirements for an engine or turbine not meeting the conditions of
clause 17.3.5.
17.3.2 covers the other requirements for an engine or turbine not meeting the conditions of clause 17.3.5.

                                                                              Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Generators,
Compressors/Pressure Boosters, Engines and Turbines
B149.1-15 7.2.4.2 item e) gas hose has been revised to read
17.3.2
A turbine not falling under Clause 17.3.5 or engine shall be equipped with
e) a gas hose which shall be of a Type I hose connector approved in compliance with
   certified to CAN/CSA-8.1, CAN/CSA-8.3, ULC/ORD C536, or CGA CR96, not exceeding
   3 ft (1 m) 6 ft (2 m) in length, where the connector gas hose is installed downstream
   of the safety shut-off valve or valves required under Item a). The valve train
   upstream of the gas hose shall be mounted, anchored, and supported in such a
   manner as to minimize damage to the valve train from the engine or turbine
   vibration.


                                                               Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Generators,
Compressors/Pressure Boosters, Engines and Turbines

(new) 17.3.1
If the generator is used as Emergency electrical supply system defined by CSA C282
Emergency electrical power supply for buildings, the gas train safety interlocks, if
installed, shall be permitted to be wired and operated in accordance with Table 1 of CSA
B282.

To remove conflicts in requirements for the wiring of the interlocks between the CSA
B149.3 and CSA C282 Emergency electrical power supply for buildings.


                                                                Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Generators,
Compressors/Pressure Boosters, Engines and Turbines

(new)
17.3.4
Where the input to an engine or turbine is in excess of 2.5 MMBtu/h (732 kW), a high
gas pressure safety device and a low gas pressure safety device shall be installed and set
to detect incorrect outlet pressure ranges of the pressure regulator.




                                                                 Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Generators,
Compressors/Pressure Boosters, Engines and Turbines
(new clause –similar to B149.1-20 clause 7.2.1.9)
17.4.2 The equipment for indoor installation or in an enclosure shall be equipped with a gas detector that
a) is installed in accordance with the detector manufacturer’s instructions for the type of gas;
b) is set to activate at gas detection levels at and above one-fifth of the lower limit of flammability;
c) upon activation, produces an audible and visual alarm;
d) is interlocked with the mechanical ventilation system; and
e) is interlocked to shut off the equipment.

New SCOP (mirroring SCOP to CSA B149.1)
17.4.2 CSA B149.3-20 requirement 17.4.2(e) “is interlocked to shut off the equipment” is not mandatory
in Saskatchewan.

                                                                                Inspiring and Shaping Excellence in Public Safety
      This Section moves the previous
      non-mandatory Annex into the
      mandatory body of the code.




18 Flare Pilot (New Section)
                     Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Flare Pilot
Deleted SCOP (no longer required)
(2015) 4.8.1

Annex E is adopted in Saskatchewan as mandatory requirements for flare pilot systems
in accordance with clause 4.8.




                                                              Inspiring and Shaping Excellence in Public Safety
       This Section can only be used with
       prior approval of Gas Inspections on
       equipment that cannot be
       evaluated otherwise.




19 Appliances in a Complex and
   Integrated Facility (New Section)
                         Inspiring and Shaping Excellence in Public Safety
20 Additional Requirements for
   Portable Appliances and
   Equipment (New Section)
                Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Additional
Requirements for Portable Appliances and Equipment
(new clauses)
20.1 Portable appliances and portable equipment shall be approved [see Annex J for guidelines on mobile food service
equipment (food trucks)].
20.2 Portable appliances and portable equipment shall be clearly marked as being portable.
20.3.1 Instructions for (re)-assembly, commissioning, operation, decommissioning, disassembly, and transportation of the
portable appliance and portable equipment shall be approved.
20.3.2 A checklist for the activities listed in Clause 20.3.1 shall
  a) be created;
  b) be dated and completed each time the portable appliance or portable equipment is relocated;
  c) identify the person(s) performing the work; and
  d) be kept with the portable appliance or portable equipment.
20.4 A portable appliance or portable equipment shall not be used in one location longer than the approved time period.
20.5 Vent lines such as those from vent valves, relief valves, regulator vents, pressure limit sensors, or other controls shall be
an integral part of the portable appliance or portable equipment, or shall be field installed in accordance with CSA B149.1.
                                                                                              Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Additional
Requirements for Portable Appliances and Equipment

New SCOP 18.1.2.1
A flare, or combustor, or thermal oxidizer, or incinerator, designed for the elimination of a waste
gas, which does so without a pilot, does not fall under the jurisdiction of Gas Inspections. No
field approval, permit, or inspection of a pilotless combustor will be required through TSASK Gas
Inspections.

Note: A combustor with a slipstream pilot (where a utility gas, such as propane or natural gas, is
introduced into the main waste gas stream to facilitate reliable combustion) is nonetheless a
pilot, and is therefore subject to the same requirements of field approval meeting B149.3, gas
permit as an appliance, and all resulting inspections, as a combustor pilot which is separated in
whole or in part from the main waste gas stream.


                                                                       Inspiring and Shaping Excellence in Public Safety
Annexes
          Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Annexes
The following Annexes have been renumbered:

Annex E - Flare Pilots was moved to Section 18.
Annex F - Guidelines for valve proving systems becomes Annex E.
Annex G - Requirements for use of oxygen in combustion systems becomes Annex F.
Annex H - Liquid fuels becomes Annex G.
Annex I - Solid fuels becomes Annex H.




                                                           Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Annexes
The following new Annexes have been added:
Annex I - Risk-based program for determining requirements for an appliance in a
complex and integrated facility.
This non-mandatory Annex can only be used with prior approval of Gas Inspections on
equipment that cannot be evaluated otherwise.
Annex J - Mobile outdoor food service unit.
To provide compiled requirements for food trucks from various codes
Annex K - Recommended requirements for automatic safety shutoff valves and
automatic vent valves installed on gas turbines having capacities greater than 12.5
MMBtu/h (3.66 MW) and inlet pressures greater than 150 psi.
See clause 17.3.5
                                                               Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Annex J
New SCOP to Annex J Mobile outdoor food service unit
J.1.1 Annex J of CSA B149.3-20 is adopted in Saskatchewan as mandatory for
inspections of mobile outdoor food service units.
J.5.4 Gas cooking appliances shall be mounted to a mobile food service unit in
accordance with J.5.3 and shall be connected by a gas connector that is certified to ANSI
Z21.69/CSA 6.16.

These gas connectors required on all gas appliances in a commercial kitchen are also
required on gas appliances in a commercial food truck.

                                                                Inspiring and Shaping Excellence in Public Safety
   Thank you for reviewing the first section of this
presentation of the substantial changes to B149.3-20
and the resulting changes to the Saskatchewan Code
            of Practice to CSA B149.3-20

   The next section of this presentation provides
changes to the Saskatchewan Code of Practice to CSA
    B149.3-20 resulting from recent experiences.

                                        Inspiring and Shaping Excellence in Public Safety
B149.3-20 Field Approval of Fuel-Burning Appliances


                                  Saskatchewan
                                  Codes of
                                  Practice 2020


                                             Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Applications
10.6.10.2

In a plant environment, where a relief valve terminates into a common flare
header, a locked-open, or sealed-open, full port manual valve may be used to
isolate the operational flare header from a relief valve discharge for
maintenance purposes of the equipment under the protection of the relief
valve. In this situation, the TSASK Pressure Relief Path (PRP) Stop Valve
Control Program may be utilized. The requirements for application and the
PRP Stop Valve Control program manual are available from TSASK Boiler and
Pressure Vessel.


                                                              Inspiring and Shaping Excellence in Public Safety
B149.3-20 – Field Approval of Fuel-Burning Appliances – Safety Controls

12.3.1 (new SCOP)

Where the Low-Fire start required in clause 12.3 is accomplished by means of
a separate Low-Fire valve train, the Low-Fire valve train shall meet the
requirements for a pilot valve train.




                                                              Inspiring and Shaping Excellence in Public Safety
 Thank you for reviewing this presentation of the substantial
 changes to B149.3-20 and the changes to the Saskatchewan
                Code of Practice to CSA B149.3-20
  If you have any questions, please ask. It is likely that others
      have the same question. Please contact your local gas
                          inspector, or
                   Doug Hird, Senior Engineer
                    Gas Codes and Standards
                      doug.hird@tsask.ca
We will be posting on-line a running Q&A so no question goes
                         unanswered.              Inspiring and Shaping Excellence in Public Safety
