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Title 49 Part 179 → Subpart D → §179.220-6

Title 49 → Subtitle B → Chapter I → Subchapter C → Part 179 → Subpart D → §179.220-6

Electronic Code of Federal Regulations e-CFR

Title 49 Part 179 → Subpart D → §179.220-6

e-CFR data is current as of December 5, 2019

Title 49Subtitle BChapter ISubchapter CPart 179Subpart D → §179.220-6


Title 49: Transportation
PART 179—SPECIFICATIONS FOR TANK CARS
Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW)


§179.220-6   Thickness of plates.

(a) The wall thickness, after forming of the inner container shell and 2:1 ellipsoidal heads must be not less than specified in §179.221-1, or not less than that calculated by the following formula:

eCFR graphic ec13no91.035.gif

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Where:

d = Inside diameter in inches;

E = 0.9 welded joint efficiency; except E = 1.0 for seamless heads;

P = Minimum required bursting pressure in psig;

S = Minimum tensile strength of plate material in p.s.i. as prescribed in AAR Specifications for Tank Cars, appendix M, Table M1;

t = Minimum thickness of plate in inches after forming.

(b) The wall thickness after forming of the inner container heads, if flanged and dished, must be not less than specified in §179.221-1, or not less than that calculated by the following formula:

eCFR graphic ec13no91.036.gif

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Where:

E = 0.9 welded joint efficiency; except E = 1.0 for seamless heads;

L = Main inside radius to which head is dished, measured on concave side in inches;

P = Minimum required bursting pressure in psig;

S = Minimum tensile strength of plate material in psi as prescribed in AAR Specifications for Tank Cars, appendix M, Table M1 (IBR, see §171.7 of this subchapter);

t = Minimum thickness of plate in inches after forming.

(c) The wall thickness after forming of the cylindrical section and heads of the outer shell must be not less than seven-sixteenths of an inch.

(d) See §179.220-9 for plate thickness requirements for inner container when divided into compartments.

[Amdt. 179-9, 36 FR 21340, Nov. 6, 1971, as amended at 66 FR 45390, Aug. 28, 2001; 68 FR 75762, Dec. 31, 2003]


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