46 C.F.R. § 154.451

Current through May 31, 2024

Section 154.451 - Design vapor pressure

The P_o (kPa) of an independent tank type C must be calculated by the following formula:

P_o = 196 + AC(_[RHO]) ³/₂

where:

A = 1.813 ([SIGMA]_m/^[DELTA][SIGMA]_A)²;

[SIGMA]_m = design primary membrane stress;

^[DELTA][SIGMA]_A = (allowable dynamic membrane stress for double amplitude at probability level Q = 10^-8) 53.9 MPa (7821 psi) for ferritic and martensitic steels and 24.5 MPa (3555 psi) for 5083-0 aluminum;

C = a characteristic tank dimension that is the greatest of h, 0.75b, or 0.45 l;

where:

h = the height of the tank or the dimension in the vessel's vertical direction, in meters;

b = the width of the tank or the dimension in the vessel's transverse direction; in meters; and

l = the length of the tank or the dimension in the vessel's longitudinal direction, in meters; and

_[RHO] = the specific gravity of the cargo.

46 C.F.R. §154.451