[Code of Federal Regulations]
[Title 46, Volume 7]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR182.730]

[Page 286-287]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 182--MACHINERY INSTALLATION--Table of Contents
 
                        Subpart G--Piping Systems
 
Sec. 182.730  Nonferrous metallic piping materials.

    (a) Nonferrous metallic piping materials are acceptable for use in 
the following:
    (1) Non-vital systems;
    (2) Aluminum fuel piping, if of a minimum of Schedule 80 wall 
thickness on an aluminum hulled vessel;
    (3) Aluminum bilge, ballast, and firemain piping on an aluminum 
hulled vessel;
    (4) If acceptable to the cognizant OCMI, nonferrous metallic piping 
with a melting temperature above 927[deg] C (1,700[deg] F) may be used 
in vital systems that are deemed to be galvanically compatible; and
    (5) Other uses specifically accepted by the cognizant OCMI.
    (b) Where nonferrous metallic material is permitted for use in 
piping systems by this subpart, the restrictions in this paragraph 
apply:
    (1) Provisions must be made to protect piping systems using aluminum 
alloys in high risk fire areas due to the low melting point of aluminum 
alloys;

[[Page 287]]

    (2) Provisions must be made to prevent or mitigate the effect of 
galvanic corrosion due to the relative solution potentials of copper, 
aluminum, and alloys of copper and aluminum, which are used in 
conjunction with each other, steel, or other metals and their alloys;
    (3) A suitable thread compound must be used in making up threaded 
joints in aluminum pipe to prevent seizing. Pipe in the annealed temper 
must not be threaded;
    (4) The use of aluminum alloys with a copper content exceeding 0.6 
percent is prohibited; and
    (5) The use of cast aluminum alloys in hydraulic fluid power systems 
must be in accordance with the requirements of Sec. 58.30-15(f) in 
subchapter F of this chapter.