ISO 3691-1:2011 pdf free download – Industrial trucks一Safety requirements and verification一 Part 1: Self-propelled industrial trucks, other than driverless trucks, variable-reach trucks and burden-carrier trucks.
m) Permanently mounted LPG containers to be filled by the user shall be fitted with the following:
1) a pressure-relief valve connected to the vapour space of the container that, when fitted inside the compartments of trucks, shall have the discharge side of the relief valve piped to the atmosphere away from the operator and that shall comply with 4.5.4.3 d);
2) an 80 % fill stop valve;
3) maximum liquid level devices suitable for the LPG in use, indicating the maximum product level and which shall not vent to the atmosphere,
n) LPG containers shall be positioned such that they are not exposed to the damaging effects of heat, particularly heat from the engine or the exhaust system. If it is necessary to fit a heat shield, this shall not inhibit ventilation.
4.5.4.2 Piping
The following applies to the piping used on trucks powered by LPG.
a) Connecting piping and all associated parts shall be easily accessible, protected against excessive heat radiation, damage and wear, and shall be flexible enough to withstand vibration and deformation in service, as follows:
– piping shall be so arranged that damage or leaks are easily detectable and that checks and maintenance can be carried out;
— piping shall be installed such that it cannot be damaged by any excessive heat radiation from hot parts of the truck;
fully rigid pipes shall not be used for connecting the container to equipment on the engine;
piping shall be so arranged that there are no projections outside the plan view outline of the truck.
b) Pressure hoses operating above 1 bar 3) shall be supported at least every 500 mm. Rigid pipes shall be supported at least every 600 mm.
c) Hoses, pipes and all connections operating at pressures above 1 bar shall be suitable for a working pressure of 25 bar and shall withstand without bursting a test pressure of 75 bar. Hoses, pipes and all connections operating below 1 bar shall withstand without bursting a test pressure of five times the maximum working pressure.
d) Pressure shall not exceed the working pressure rating of components in any section of pipe work containing LPG in liquid form between two shut-off valves that are closed; a pressure-relief valve, for example, or other suitable means, may be used if necessary.
e) Aluminium piping shall not be used.
f) Hoses shall be as short as practical.
g) Pressure unions and joints operating above 1 bar shall be made of metal, except for any constrained sealing washers.
4.5.4.3 Equipment
The following appües to the equipment used on trucks powered by LPG.
a) The supply of gas shall be automatically cut off when the engine stops, irrespective of whether or not the ignition system has been switched off.
b) For multi-fuel applications, the system shall be designed to avoid the possibility of LPG entering any other fuel container and to shut off each fuel source before the alternative one is opened.
c) If the truck is equipped with two or more containers to supply fuel, they shall be connected via a multi-way valve or other suitable means, so that LPG can only be drawn from one container at a time. The use of two or more containers at the same time shall not be possible.
d) Pressure-relief valves or liquid-level indicators shall be installed such that they cannot discharge in the direction of the operator or onto truck components that could be a source of ignition.
e) If corrosion of a part would interfere with its proper functioning, that part shall be provided with a corrosion-resistant protective coating.
f) All fuel system components shall be firmly secured to the truck.
9) Pressure-reducing valves shall be readily accessible for inspection and maintenance.
h) The engine compartment shall be designed in accordance with 4.5.4.1 g). in order to avoid any LPG
accumulation.
4.5.4.4 Regional requirements
LPG-powered trucks are subject to regional requirements, additional to the requirements of this part of ISO 3691. See ISOITS 3691-8.
4.6 Systems for lifting and tilting
4.6.1 Lift chains
The truck or mast manufacturer shall have on record a certificate from the chain manufacturer giving the breaking load of the chains used.
When the lifting mechanism includes a chain or chains, the truck manufacturer shall only use leaf or roller chains. These shall provide a minimum factor, K1, when supporting the maximum capacity load and assuming no friction in the mast structure, which is given by the following equation.