[Code of Federal Regulations]

[Title 46, Volume 4]

[Revised as of October 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 46CFR119.730]



[Page 370-371]

 

                            TITLE 46_SHIPPING



                  (This book contains parts 90 to 139)

 

   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)

 

PART 119_MACHINERY INSTALLATION--Table of Contents

 

                        Subpart G_Piping Systems

 

Sec.  119.730  Nonferrous metallic piping materials.



    (a) Nonferrous metallic piping materials are acceptable for use in 

the following:

    (1) Non-vital systems;

    (2) Aluminum fuel piping on an aluminum hulled vessel, if at least 

Schedule 80;

    (3) Aluminum bilge, ballast, and firemain piping on an aluminum 

hulled vessel;



[[Page 371]]



    (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;

    (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.