# Expansion or contraction.

- **operation:** document
- **citation:** 49 CFR 193.2135
- **title:** Expansion or contraction.
- **source type:** regulation
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** historical
- **official:** true
- **published on:** Not available
- **effective on:** 1999-10-01
- **summary:** Each operator shall consider the amount of contraction and expansion of each component during operating and environmental thermal cycling and shall:

(a) Provide components that operate without detrimental stress or restriction of movement, within each component and between components, caused by con
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/49-cfr-193-2135.json
- **markdown:** https://regulus.evalyn.ai/document/49-cfr-193-2135.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-193-2135
- **source url:** https://www.govinfo.gov/app/details/CFR-1999-title49-vol3/CFR-1999-title49-vol3-sec193-2135
**body:**

Each operator shall consider the amount of contraction and expansion of each component during operating and environmental thermal cycling and shall:

(a) Provide components that operate without detrimental stress or restriction of movement, within each component and between components, caused by contraction and expansion; and

(b) Prevent ice buildup from detrimentally restricting the movement of components caused by contraction and expansion.
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- **body characters:** 447