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Canadian Code |
US code |
| Tank Construction |
Designed and fabricated to ASME Section VIII, Div 1, CSA B51 including Annex G
312 psig for internal and 250 psig for external.
Approved design in each jurisdiction.
Includes a corrosion allowance of 25% for externally mounted tanks.
Openings greater than #54 drill shall either be recessed or shall be a “substantial fitting”, equal to least the wall thickness of the vessel
One thousand hour salt spray rating on the coating
Manifold tanks must pass a crush test proving the manifold is capable of withstanding the same crushing load as a single of the same diameter and wall thickness
Liquid withdrawal openings shall be protected with back check valves
Tanks moved from one vehicle to another or being returned to service shall be inspected by an approved organization
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Designed and fabricated to ASME Section VIII, Div 1.
External tanks shall be rated for 312 psig if built after 010401, 250 psig if built earlier.
Enclosed tanks shall be rated at 312 psig
Passenger vehicles limited to 200 USG
Non passenger vehicles limited to 300 USG
Tanks larger than 30 USG shall fill into the vapour space
Corrosion resistant coating
If heated, shall be controlled not to exceed 200 psig.
Valves, etc shall be protected from accidental contact.
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| Tank Installation |
Tank can not be installed such that the person filling it must lie on the ground
Have a heat shield if closer than 4” from a heat source and not any closer than 8” to the catalytic converter
When installed at the rear of a unibody bus have a reinforced bumper, not be closer than 12” to the rear most point of the bumper and not be closer than 4” to the differential
To have between 7 and 9” road clearance based upon vehicle wheel base if mounted between the axles and 8” if mounted at the rear of the vehicle as well as meeting the clearance angle requirements
The tank shall not project beyond the sides or top of the vehicle
If installed inside a vehicle, to have a rigid, corrosion resistant vapour box, vented to the outside of the vehicle.
The seals for the vapour box rated from -40°C to 35°C, resistant to propane, road salt, vehicle vibration and non swelling or shrinking
Interconnected tanks shall be installed with the tanks level
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Located to minimize damage to the container or its fittings
Require a heat shield if located within 18” of a heat source
Nameplate shall be readable directly or with a lamp and mirror
Containers shall not be mounted on the roof, extend beyond the sides of the vehicle, ahead of the front axle or behind the rear axle
Containers mounted between axles shall not extended below the lowest part of the vehicle
Containers mounted behind the axle shall meet the ramp angle also
Shall be mounted to resist vibration
If installed in a vehicle the valves are to be mounted in a gas tight enclosure, vented to the outside
The enclosure, seals, etc shall be of durable materials
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| General Valve |
Approved to UL, CSA B12.2 or EN67 |
Material suitable for service
Melting point greater than 1500°F except for float gauge
Main shut off shall be readily accessible without tools
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| Relief Valve |
Spring loaded internal type
Marked as per code
Directed downward, away from the vehicle, outside of an enclosed space, as far as practical from a source of ignition, protected with a rain cap
Where a pipe-away is used, it shall not restrict the flow of propane, be able to withstand the pressure and be of metallic construction, flexible metallic hose of metal re-enforced hose.
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PRV to UL 132 or equal Internal or flush type
Start to leak setting determined by the age of the container
Fusible plugs not allowed
Communicate to vapour space
Marked with code info
Directed upwards or downwards with 45 degrees of vertical
Not impinging on the tank, or vehicle.
If piped away shall have a break away adaptor and no part shall have and ID less than the relief valve opening
The system shall have a length of non-metallic hose installed, as short as possible and capable of withstanding the full pressure from the relief valve.
The system shall be mechanically secured and not routed between the bumper and vehicle
Rain cap on the discharge is required
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| Fixed Liquid Level Gauge |
All tanks to have one c/w# 54 drill opening and to be used to monitor the performance of stop fill valve
The valve shall have a label “If equipped with a stop fill valve, use of fixed liquid level gauge is not required”
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All tanks to have one c/w #54 drill opening
Not be used if the tank is equipped with an OPD
Valve is to be labeled with the percentage of the tank it is located for
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| Double Back Check Valve |
Permit flow in only one direction |
Shall operate at stopped or reverse flow |
| Service Valve |
Valve to have internal excess flow and automotive closure when engine ignition is off |
Valve to have manual shut off, excess flow and automotive closure when engine ignition is off |
| Excess Flow Valve |
Engines < or = to 9 l to not exceed 7.6 lpm
Engines > 9 l not to exceed 12.1 lpm
Amendment accepted to change to Engines < or = 240 HP to not exceed 7.6 lpm
Engines > 240 HP not to exceed 12.1 lpm
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To close at the flow specified by the manufacturer |
| Stop Fill Valve |
To stop flow at 80% of tank capacity and equipped with double back check |
Tanks shall be equipped with this and the valve shall have double back check
If the tank is so equipped, a label is placed on the spit valve not requiring its use in low emission transfer stations
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| Float Gauge |
As per CSA B51 Annex G |
Not required |
| Tank Brackets |
Design calculations submitted to the jurisdiction for approval confirming the brackets are capable of withstanding 20 G in the forward direction and 8 G in the other two directions, not acting simultaneously
O and J brackets shall have a resilient material installed between the bracket and tank wall
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Manufacture to design to 4 G in any direction, not acting simultaneously |
| Tank Valve Guard |
Withstand a load of 50 kg dropped from 1.5 m without the tearing out or the shell deforming more than 1t |
Valves to be protected from damage |
| Tank Nameplate |
Mounted such that any corrosion occurring between the tank and nameplate can be monitored. If seal welded, the weld must be checked with LDP or MP |
Shall be Stainless steel and mounted to minimize corrosion of nameplate and not cause corrosion of the tank |
| Coating |
1000 hr salt spray rating |
Coated to minimize corrosion |
| Labels |
Outlets labels shall be metal or other durable material resistant to water and lettering ¼” high |
Shall be labeled |
| Piping |
A53 or A106 or brass to ASTM B43.
Vapour < 125 psig shall be S40 and if ≥ to 125 psig shall be S80. All liquid piping shall be S80
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B36.10M, A 53, A 106B, B 43, or B42
If vapour service is ≤ 125 psig rated at 125,if liquid or vapour > 125 but ≤ to container pressure rated at 250 psig, if > than container pressure, rated at 350 psig, or container pressure, which ever is higher, or 400 psig WOG rating
Exposed pipe shall be of corrosion-resistant material or protected to minimize corrosion
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| Hose |
For vapour service less than 5 psig, hose must be resistant to propane.
All other hose shall be CSA 8.1, CGA Type III with a minimum rated pressure of 350 psig and stainless steel reinforced
The hose shall have flow greater than the excess flow it is connected to.
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If used at less than container pressure to be designed and marked for operating pressure |
| Tube |
ASTM A539, SAE J527 or ASTM B75
Minimum thickness based upon diameter
Steel tubing coated with lead and covered in coiled steel wire
Copper tubing to be sheathed in rubber or plastic as per ASTM D572 and marked AUTOPROPANE
Sheath to be cut back 1” at fittings
Fitting shall be rated for the pressure service and accessible
Connections shall be double flare
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A 539, B 135, Type L or K of B88, or B280
-if vapour service is ≤ 125 psig rated at 125,if liquid or vapur > 125 but ≤ to container pressure rated at 250 psig, if > than container pressure, rated at 350 psig, or container pressure, which ever is higher, or 400 psig WOG rating
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| Installer |
Shall instruct the user in the safe operation of the system and supply the user with the manufacturers written instructions, where available
Shall be trained
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Shall be trained |
| Fuel Pump |
Tanks with fuel pumps in them shall be marked as such, equipped with a crash switch and the pump certified to EN67 |
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| Electrical |
System shall be separately fused.
Propane-containing components shall not be used to carry electrical current.
Wires shall be protected from damage.
Electrical components contained within propane containing components shall have the propane containing components purged with an inert gas or vacuum purged prior to use
Wiring shall be stranded
All connections water tight and vibration resistant
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| Propane injectors |
Shall be OEM type and approved to EN67 |
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| Remote Fill Connection |
Either in a metal enclosure, permanently mounted in the body of the vehicle or located on the bumper such that the vehicle will provide protection |
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| Bulkhead Fitting |
Shall be steel or brass with wrench flats on the fitting, have a clamp nut and lockwasher and use a flare, tapered pipe or fitting thread to connect the line |
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| General |
Nested bushing are not allowed
Thread sealant shall be ULC-S642
Bends are not allowed that reduce the cross section area of the part or weaken the part
Close nipples are not allowed
Structural members of the vehicles shall not be cut such that it reduces the vehicle strength
Piping and tubing can not be installed between parts of the vehicle that move relative to one another
Piping and tubing shall be coated on the exterior with a corrosion resistant material
Hose, pipe or tubing shall not be run in concealed areas
If run within 4” of a heat source shall have a heat shield installed
All assembled piping, tubing and hose shall be tested with air or inert gas
All connections on the tank shall be tested with a liquid leak detection solution or device after the equipment is activated
If mono fuel, the gasoline tank and fill connection shall be removed or plugged
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Pipe and hose shall be installed to minimize damage and installed in a protected location
If tees are used, the tee shall be in the main fuel line under the floor of the vehicle
When two or more service lines are connected spring-loaded back flow connections shall be used
A hydrostatic relief valve or equal shall be installed between sections of piping, tubing or hose that can be isolated
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| Vapourizer |
Same as converter, or regulator
Sized to suit engine
Securely fastened
Not have a fuse plug
Equipped with a lock off
Approved to EN67
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Fabricated from material resistant to propane and were exhaust gases are used to resist the exhaust gas
Rated for at least tank pressure
Not to have a fuse plug
Able to be drained using a valve or plug at the lower end of the unit
To have approved pressure reducing equipment installed between it and the tank
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| Fuel Lock Off |
Connected to ensure only one fuel can be used at one time
Compatible with OEM existing requirements
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Located as close to the inlet of gas regulator as possible
Prevent flow of fuel to the carburetor when the engine is not running
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| Marking |
All propane vehicles shall be marked with an approved label |
All propane vehicles shall be marked with an approved label |
| Re-Inspection |
All propane vehicles shall have their fuel systems inspected every five years |
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