[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: 46CFR98.25-20]

[Page 85]
 
                           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. 98.25-20  Installation of cargo tanks.

    (a) Independent tanks shall be arranged in the vessel so as to 
provide a minimum clearance of not less than 24 inches from the vessel's 
side and not less than 15 inches from the vessel's bottom. Where more 
than one tank is installed in a vessel, the distance between such tanks 
shall be not less than 15 inches, unless otherwise approved by the 
Commandant. Alternate provisions may be made for moving such tanks to 
provide for adequate inspection and maintenance of the vessel's 
structure and the tanks.
    (b) The design shall show the manner in which the tanks are to be 
installed, supported, and secured in the vessel and shall be approved 
prior to installation. Tanks shall be supported in steel saddles and 
securely anchored in place. If the tanks are required to be stress-
relieved no appendages shall be welded to the tanks after they have been 
stress-relieved unless authorized by the Commandant.
    (c) Tanks may be located in dry cargo holds or in liquid cargo tanks 
or may be installed ``on deck'' or ``under deck'' with the tank 
protruding above deck. On installations where a portion of the tank 
extends above the weather deck, provision shall be made to maintain the 
weathertightness of the deck, except that vessels operating on protected 
inland waters may have tanks located in the holds of hopper type barges 
without the watertightness of the deck being maintained. All tanks shall 
be installed with the manhole opening and fittings located above the 
weather deck.
    (d) The anhydrous ammonia tanks may be installed in the bulk liquid 
cargo tanks provided the liquid surrounding the enclosed anhydrous 
ammonia tanks complies with the following chemical and physical 
properties:
    (1) Boiling point above 125 deg. F. at atmospheric pressure.
    (2) Inert to ammonia at 100 deg. F. at atmospheric pressure.
    (3) Noncorrosive in the liquid and vapor phase to the ammonia tanks 
and piping.

[CGFR 65-50, 30 FR 17022, Dec. 30, 1965, as amended by CGFR 70-10, 35 FR 
3711, Feb. 25, 1970]

[[Page 86]]