---
kind: "section"
citation: "49 C.F.R. § 193.2155"
title: "49"
number: "193.2155"
heading: "Structural requirements."
url: "https://uscodex.org/cfr/49/193.2155"
---

# §193.2155. Structural requirements.

- (a) The structural members of an impoundment system must be designed and constructed to prevent impairment of the system's performance reliability and structural integrity as a result of the following:
  - (1) **The imposed loading from—**
    - (i) Full hydrostatic head of impounded LNG;
    - (ii) Hydrodynamic action, including the effect of any material injected into the system for spill control;
    - (iii) The impingement of the trajectory of an LNG jet discharged at any predictable angle; and
    - (iv) Anticipated hydraulic forces from a credible opening in the component or item served, assuming that the discharge pressure equals design pressure.
  - (2) The erosive action from a spill, including jetting of spilling LNG, and any other anticipated erosive action including surface water runoff, ice formation, dislodgement of ice formation, and snow removal.
  - (3) The effect of the temperature, any thermal gradient, and any other anticipated degradation resulting from sudden or localized contact with LNG.
  - (4) **Exposure to fire from impounded LNG or from sources other than impounded LNG.**
  - (5) If applicable, the potential impact and loading on the dike due to—
    - (i) Collapse of the component or item served or adjacent components; and
    - (ii) If the LNG facility adjoins the right-of-way of any highway or railroad, collision by or explosion of a train, tank car, or tank truck that could reasonably be expected to cause the most severe loading.
- (b) An LNG storage tank must not be located within a horizontal distance of one mile (1.6 km) from the ends, or 1/4 mile (0.4 km) from the nearest point of a runway, whichever is longer. The height of LNG structures in the vicinity of an airport must also comply with Federal Aviation Administration requirements in [14 CFR Section 1.1](/cfr/14/1.1.md).

## Notes

### Amendments

[45 FR 9203, Feb. 11, 1980, as amended by Amdt. 193-17, 65 FR 10959, Mar. 1, 2000]

### Authority

Authority: 49 U.S.C. 5103, 60102, 60103, 60104, 60108, 60109, 60110, 60113, 60118; and 49 CFR 1.53.

### Source

Source: 45 FR 9203, Feb. 11, 1980, unless otherwise noted.

### Amendments

[45 FR 9203, Feb. 11, 1980, as amended by Amdt. 193-17, 65 FR 10959, Mar. 1, 2000]