---
kind: "section"
citation: "49 C.F.R. § 193.2505"
title: "49"
number: "193.2505"
heading: "Cooldown."
url: "https://uscodex.org/cfr/49/193.2505"
---

# §193.2505. Cooldown.

- (a) The cooldown of each system of components that is subjected to cryogenic temperatures must be limited to a rate and distribution pattern that keeps thermal stresses within design limits during the cooldown period, paying particular attention to the performance of expansion and contraction devices.
- (b) After cooldown stabilization is reached, cryogenic piping systems must be checked for leaks in areas of flanges, valves, and seals.

## Notes

### Source

Source: Amdt. 193-2, 45 FR 70405, Oct. 23, 1980, unless otherwise noted.

### 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.