Owner's Manual

53
Z223.1) and all requirements of the gas supplier and
municipality.
4.5.1 Please consider the serviceman who must periodically
clean and adjust the modules, and repair accessories.
Do not block passageways with piping. Do not block
access panels on the module jackets.
4.5.2 Material – Use only Schedule 40 black iron pipe.
Make sure all threads are fully formed and free of
burrs. Threaded joints should be sealed with an
approved compound to prevent leaks.
4.5.3 Traps – Install a trap similar to that shown in Figure
4-8 at the low end of the vertical run to each module.
4.5.4 Supports – Pipe supports should be installed according
to Figure 4-7. Supports should encircle the pipe at
ceiling level but allow movement for expansion of
the piping. The weight of the gas piping must not be
placed upon the module gas connection.
4.5.5 Grounding – Gas piping must be grounded. If any
non-conductive ttings are used they must be bridged
with an appropriately sized ground wire. Particular
attention should be given to a propane system with
above ground tank(s). Such tank(s) must be externally
grounded.
4.5.6 Leak Testing – If the gas lines have been designed
according to preceding sections of this manual, the
operating gas pressure will be 0.5 psig. Under such
pressure, fuel gas may be used for leak testing. On
each module, turn the manual portion of combination
valve to off position before applying gas pressure.
Immediately after applying gas pressure, apply leak
check solution to all gas piping and observe piping for
leaks. Repair any leaks found and retest piping. If the
gas supplier requires leak testing at pressures higher
than 0.5 psig, or with inert gas, follow that required
procedure in full.
4.6 Gas Piping Maintenance – Piping should be inspected
annually or after any extended shut down period. If
the normal operating gas pressure is 0.5 psig or less,
fuel gas can be used for leak detection as described in
4.5.6 above.
4.6.1 Any pipe or tting showing unusual rust or corrosion
should be replaced.
4.6.2 Gas piping should not be used as an electrical
conductor. Relocate any electrical circuit which is
found to be using the gas piping as a conductor.
Note: Many municipalities allow light weight, low
voltage, well insulated electrical wire to be supported
on the gas piping with approved non-conductive
fasteners.
4.6.3 Gas piping should not be used to support any other
pipe or heavy object. Find other means to support any
such heavy object.
4.6.4 Traps should be cleaned at least once every two
years. Turn off gas supply, remove cap below tee, as
shown in Figure 4-8, and clean out all moisture and
foreign material. Replace cap and check for leaks as
described in 4.5.6 above.