4.1.1 Selection and spacing of pipe supports in
shipboard systems should be determined as a function of allowable
stresses and maximum deflection criteria. Support spacing should be
not greater than the pipe manufacturer's recommended spacing. The
selection and spacing of pipe supports should take into account pipe
dimensions, length of the piping, mechanical and physical properties
of the pipe material, mass of pipe and contained fluid, external pressure,
operating temperature, thermal expansion effects, loads due to external
forces, thrust forces, water hammer, vibration, maximum accelerations
to which the system may be subjected, and the type of support. The
support spans should also be checked for combinations of loads.
4.1.2 Each support should evenly distribute the
load of the pipe and its contents over the full width of the support
and be designed to minimize wear and abrasion.
4.1.3 Heavy components in the piping system such
as valves and expansion joints should be independently supported.
4.1.4 Suitable provision should be made in each
pipeline to allow for relative movement between pipes made of plastics
and the steel structure, having due regard to:
4.1.5 When calculating the thermal expansions,
account should be taken of the system working temperature and the
temperature at which assembling is performed.