[Code of Federal Regulations]
[Title 46, Volume 4]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR98.25-95]

[Page 90]
 
                           TITLE 46--SHIPPING
 
    CHAPTER I--COAST GUARD, DEPARTMENT OF TRANSPORTATION (CONTINUED)
 
PART 98--SPECIAL CONSTRUCTION, ARRANGEMENT, AND OTHER PROVISIONS FOR CERTAIN DANGEROUS CARGOES IN BULK--Table of Contents
 
                Subpart 98.25--Anhydrous Ammonia in Bulk
 
Sec. 98.25-95  Tests and inspections.

    (a) Each tank shall be subjected to the tests and inspections 
described in this section in the presence of a marine inspector, except 
as otherwise provided in this part.
    (1) An internal inspection of the tank is conducted within--
    (i) Ten years after the last internal inspection if the tank is a 
pressure-vessel type cargo tank on an unmanned barge described under 
Sec. 151.01-25(c) of this chapter and carrying cargo at temperatures of 
-67  deg.F (-55  deg.C) or warmer; or
    (ii) Eight years after the last internal inspection if the tank is 
of a type other than that described in paragraph (a)(1)(i) of this 
section.
    (2) An external examination of unlagged tanks and the visible parts 
of lagged tanks is made at each inspection for certification and 
periodic inspection. The owner shall ensure that the amount of 
insulation deemed necessary by the marine inspector is removed from 
insulated tanks during each internal inspection to allow spot external 
examination of the tanks and insulation, or the thickness of the tanks 
may be gauged by a nondestructive means accepted by the marine inspector 
without the removal of insulation.
    (3) If required by the Officer in Charge, Marine Inspection the 
owner shall conduct nondestructive testing of each tank in accordance 
with Sec. 98.25-97.
    (4) If the tank is a pressure vessel type cargo tank with an 
internal inspection interval of 10 years, and is 30 years old or older, 
determined from the date it was built, the owner shall conduct 
nondestructive testing of each tank in accordance with Sec. 98.25-97, 
during each internal inspection.
    (b) A hydrostatic test of 1\1/2\ times the maximum allowable 
pressure as determined by the safety relief valve setting shall be made 
at any time that the inspector considers such hydrostatic test necessary 
to determine the condition of the tank. If the jacket and lagging are 
not removed during the hydrostatic tests prescribed in this paragraph, 
the tank shall hold the hydrostatic test pressure for at least 20 
minutes without a pressure drop.
    (c) The safety relief valves shall be popped in the presence of a 
marine inspector by either liquid, gas or vapor pressure at least once 
every four years to determine the accuracy of adjustment and, if 
necessary, shall be reset.

[CGFR 65-50, 30 FR 17022, Dec. 30, 1965, as amended by CGFR 67-86, 32 FR 
17622, Dec. 9, 1967; CGD 85-061, 54 FR 50965, Dec. 11, 1989; USCG 1999-
4976, 65 FR 6503, Feb. 9, 2000]