Installation
06-237518-001
4-25
July 2018
4-9.5.3
Grooved Joining
Rolled grooved joining may be used for Kidde IGS. If such fittings are to be used then the
supplier must be consulted to verify maximum working pressure.
4-9.5.4
Installation of Pipes
Pipe and fittings must be installed in strict accordance with the system drawings and good
commercial practices. The piping between the cylinder and the nozzles must be the shortest
route possible, with a minimum of fittings. Any deviations in the routing or number of fittings
must be approved by the design engineer before installation.
Piping must be reamed free of burrs and ridges after cutting, welding or threading. All threaded
joints must conform to ANSI B1-20-1 or ISO/IEC Guide 7 as appropriate. Joint compound or
thread tape must be applied only to the male threads of the joint, excluding the first two
threads. Welding must be in accordance with Section IX of the ASME Boiler and Pressure Vessel
Code. Each pipe section must be swabbed clean internally, using a non-flammable organic
solvent.
All piping must be blown clear with dry nitrogen or compressed air before installing the
discharge nozzles.
The piping must be securely braced to account for discharge reaction forces and thermal
expansion/contraction. Care must be taken to ensure the piping is not subjected to vibration,
mechanical or chemical damage. All hangers must conform to general industry standards for
pipe hangers and conform to ANSI B-31.1. Refer to ANSI B-31.1 for additional bracing
requirements.
Dirt traps at least 2-inches (50 mm) in length must be installed at the end of each pipe run.
Care shall be taken that the pipe ends extend into fittings sufficiently.
Pipe runs shall, unless otherwise specified, be horizontal/vertical. Pipes in areas where
condensation may be expected may be laid (sloped) in such a manner that avoidance of
accumulation of water within the pipe or pipe section is prevented. In cases where sloping is
not possible, the pipe sections shall be provided with drain facilities.
CAUTION
Should site conditions demand major alterations to the pipe layout, notification shall
be given to the design engineer on a marked up copy of the relevant drawings for
updating and preparation of new ‘as-built’ flow calculations. These will evaluate the
new pipe runs and determine whether modifications to the design are needed.
The design engineer shall approve the new pipe run before installing of the pipes.
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