---
kind: "section"
citation: "46 C.F.R. § 154.448"
title: "46"
number: "154.448"
heading: "Calculations."
url: "https://uscodex.org/cfr/46/154.448"
---

# §154.448. Calculations.


The following calculations for an independent tank type B must be specially approved by the Commandant (CG-ENG):

- (a) Plastic deformation, fatigue life, buckling, and crack propagation resulting from static and dynamic loads on the tank and its support.
- (b) **A three-dimensional analysis of the stress exerted by the hull on the tank, its support, and its keys.**
- (c) The response of the tank and its support to the vessel's motion and acceleration in irregular waves or calculations from a similar vessel.
- (d) **A tank buckling analysis considering the maximum construction tolerance.**
- (e) A finite element analysis using the loads determined under [§ 154.406](/cfr/46/154.406.md).
- (f) A fracture mechanics analysis using the loads determined under [§ 154.406](/cfr/46/154.406.md).
- (g) **The cumulative effects of the fatigue load from the following formula—**

## Notes

### Amendments

[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983]

### Authority

Authority: 46 U.S.C. 3703, 9101; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 74-289, 44 FR 26009, May 3, 1979, unless otherwise noted.

### Amendments

[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983]