[Code of Federal Regulations]
[Title 49, Volume 2]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR178.270-2]

[Page 870]
 
                        TITLE 49--TRANSPORTATION
 
 CHAPTER I--RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION, DEPARTMENT OF 
                             TRANSPORTATION
 
PART 178_SPECIFICATIONS FOR PACKAGINGS--Table of Contents
 
               Subpart H_Specifications for Portable Tanks
 
Sec. 178.270-2  General.

    (a) Each tank, including attachments and service and structural 
equipment, must be designed to withstand, without loss of contents, the 
maximum internal pressure that can be anticipated to result from the 
contents and the static and dynamic stresses incurred in normal handling 
and transportation.
    (b) For the purpose of this subchapter MAWP is the maximum pressure 
that an IM portable tank may experience during any normal operation 
(including loading and unloading). The only exception to this limitation 
is hydrostatic testing.
    (c) Each portable tank must have a cross-sectional design that is 
capable of being stress analyzed either mathematically or by the 
experimental method contained in UG-101 in Section VIII of the ASME Code 
(IBR, see Sec. 171.7 of this subchapter), or other method acceptable to 
the Associate Administrator.
    (d) Each portable tank must be designed so that the center of 
gravity of the filled tank is approximately centered within the points 
of attachment for lifting devices.
    (e) When credit is taken for insulation to reduce the required 
emergency venting capacity of safety relief devices, the insulation must 
be jacketed or otherwise protected from the accumulation of moisture or 
foreign matter that would decrease its efficiency or corrode the tank.
    (f) Each portable tank that has a lining must have a lining material 
that meets the following requirements:
    (1) The material used to line the tank must be--
    (i) Substantially immune to attack by the hazardous material 
transported;
    (ii) Homogeneous;
    (iii) Nonporous;
    (iv) Imperforated when applied;
    (v) At least as elastic as the material of the tank shell; and
    (vi) Have thermal-expansion characteristics compatible with the tank 
shell.
    (2) The lining of the tank, tank fitting and piping must be--
    (i) Attached by bonding or other satisfactory means;
    (ii) Continuous; and
    (iii) Extended around the face of any flange.
    (3) Joints and seams in the lining must be made by fusing the 
material together or by other equally effective means.

[Amdt. 178-65, 46 FR 9895, Jan. 29, 1981, as amended by Amdt. 178-65, 46 
FR 24184, Apr. 30, 1981; Amdt. 178-97, 56 FR 66284 and 66287, Dec. 20, 
1991; 66 FR 45386, 45389, Aug. 28, 2001; 68 FR 75750, Dec. 31, 2003]