# ACF Industries — Pipeline Safety Interpretation

**Citation:** PI-71-0120  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 1971-12-15

PI-71-0120 response to ACF Industries concerning 192.505.

## Document text

<<<PAGE 1>>>

PI-71-0120
December 15, 1971
Mr. R. D Wilkins, Manager
Applications Engineering
Engineering and Research
ACF Industries
P.O. Box 2117
Houston, Texas 77001
Dear Mr. Wilkins:
Thank you for your letter of November 22, 1971, that inquired about the interpretation of 49 CFR §§192.505 (c) and (d).
You are correct in your understanding that in the very limited circumstances delineated in §192.505 (d) the
requirements for a strength test and for maintaining test pressure for eight hours is not required. Thus, if a component
other than pipe is the only item being replaced or added to a pipeline, a strength test after installation is not required, if
the manufacturer of the component certifies that (1) the component was tested to at least the pressure required for the
pipeline to which the component is being added, or (2) the component was manufactured under a quality control
system that ensures that each item manufactured is at least equal in strength to a prototype and that the prototype was
tested to at least the pressure required for the pipeline to which it is being added.
The reason for this exception is that if the manufacturer meets either of the requirements of §192.505 (d) an equivalent
level of safety to §192.505 (c) is maintained without the burden of the eight hour test.
We trust that this will satisfactorily clarify the regulations for you.
Sincerely,
Original signed by:
Joseph C. Caldwell
Acting Director
Office of Pipeline Safety

<<<PAGE 2>>>

ACF Industries
P.O. Box 2117
Houston, Texas 77001
November 22, 1971
Mr. Joseph C. Caldwell
Acting Director
Office of Pipeline Safety
Department of Transportation
400 Sixth St. S.W.
Washington, D. C. 20590
Dear Mr. Caldwell:
We would like to request an interpretation of Paragraph 192.505 of Title 49, Code of Federal Regulations.
In Subparagraph (c) of Paragraph 192.505, an eight hour system strength test is required for a pipeline operating
above 30% of pipe SMYS.
In Subparagraph (d), it is stated that a strength test of this pipeline is not required if a component manufacturer
certifies that the valve was tested to at least the pressure required for the pipeline in which this component will
be installed.
From the way the Paragraph is phrased, we are able to interpret that the eight hour test duration is not required
by the wording of Subparagraph (d).
Since this interpretation is literal, we ask that you verify this interpretation so that we may be also assured of the intent
of the paragraph.
Very truly yours,
R. D. Wilkins
Manager –
Applications Engineering
Engineering & Research

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1971/g71-11-22_Wilkins_192.505-lmxs.pdf>
- Source ID: `phmsa`
- SHA-256: `f7f54cb586c5064bb9a56bc0e2e4c7a49ee0c12d4fd5e3a5678d0853dda308b8`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-23T16:07:40.824Z
- Document slug: `phmsa-interpretation-pi-71-0120`

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