23 July 2003
TUBING SUPPORT SPACING
Nominal Tubing Size
Gas and Liquid Service
B.8.1.4 Materials. In general, piping materials should be in
accordance with MIL-STD-777, Schedule of Piping, Valves,
Fittings, and Associated Piping Components for Naval Surface
Ships. However, materials called out in ASME B-31.1 may be used
with prior SCA approval. Consideration should be given to
eliminate contact between dissimilar metals where galvanic
effects of corrosion may occur. Specific approval must be
obtained from the SCA for the use of non-metallic piping and
piping components. Refer to Appendix A for additional
information on material categories.
B.8.1.5 Pipe Joints. Only pipe joint designs that are
fabricated, assembled and tested to accepted military or
commercial standards may be used (typically; butt welds, socket
welds, bolted flange connections and O-ring faced fittings).
Other joint designs (typically; bite type, flared, compression
fittings and threaded joints) must be justified to the SCA.
Brazed joints, while considered standard practice in shipboard
pipe systems, should be justified for portable and shore based
The number of pipe joints should be kept to a minimum. Wherever
possible, bending of the pipe should be considered. MIL-STD-
specific requirements and limitations for bending pipe or tube.
All pipe and tube fittings should be used only at temperatures
and pressures not exceeding ratings recommended by the
Lines, which must be connected and disconnected during system