[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: 46CFR98.25-20]



[Page 82]

 

                            TITLE 46_SHIPPING



                  (This book contains parts 90 to 139)

 

   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (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]