Installation
06-237619-001 4-23 April 2020
4-8 DISTRIBUTION PIPE & FITTINGS
Piping should be installed in accordance with good commercial practice. Care should be taken
to avoid the potential for restrictions being caused by foreign material, faulty fabrication or
improper installation.
The piping system should be securely supported with due allowance made for agent thrust
forces and thermal expansion or contraction. Piping should not be subjected to mechanical,
chemical, vibrational, or other damage. Where there is an explosion risk, the piping should be
attached to those supports which have been identified as being the least likely to be dislodged.
Open ended pipe sections, selector valves, nozzle ports etc. should be protected against
ingress of impurities until the installation is completed.
Although Agent piping systems are not subjected to continuous pressurization, ensure that the
type of pipe installed can withstand the maximum stress at the maximum storage temperature
at the site.
The selected pipe schedule shall always be in accordance with the project specification and
accepted by the authorities having jurisdiction.
Lay pipes in such a manner that accumulation of water within the pipe or pipe section is
avoided with a slope towards the nozzles. In cases where this isn’t possible, provide drain
facilities to the pipe sections.
4-8.1 Pipe
Piping must be of noncombustible material having physical and chemical characteristics, such
that its integrity under stress can be predicted with reliability. The computer flow program has
only been verified for the specific types and schedule of pipe and fittings covered in this
manual. There is a risk that the system may not supply the required quantity of Agent in
unbalanced systems when other pipe types and fittings are used.
4-8.2 Ferrous Piping
Use black steel or galvanized pipe in accordance with Table 4-11, Table 4-12 and Table 4-13.
CAUTION
Pipe supplied as dual stenciled A-120/A-53 Class F meets the requirements of
Class F furnace welded pipe ASTM A-53. Ordinary cast-iron pipe, steel pipe
conforming to ASTM A-120, or nonmetallic pipe must not be used.
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