1910.111(b)(7): Piping, tubing, and fittings
Key takeaways
- 1910.111(b)(7) is part of OSHA's general industry standards (29 CFR Part 1910, Subpart H).
- OSHA cited it 1 times in the last 3 years, in 1 inspections, with $5,959 in current penalties.
- Related part: 1910.111(b) Basic rules (7 citations).
- Free 5-minute toolbox talk for your crew below.
In this article
What this rule covers
29 CFR 1910.111(b)(7) ("Piping, tubing, and fittings") is one requirement inside 1910.111 Storage and handling of anhydrous ammonia, an OSHA general industry standard (Part 1910, Subpart H). It includes 7 sub-paragraphs. The official text below is copied word for word from the Electronic Code of Federal Regulations (eCFR). The numbers, injury cases and training on this page show how OSHA enforces it on real job sites.
Official text
(7) Piping, tubing, and fittings. 1 citations
(i) All piping, tubing, and fittings shall be made of material suitable for anhydrous ammonia service.
(ii) All piping, tubing, and fittings shall be designed for a pressure not less than the maximum pressure to which they may be subjected in service. 1 citations
(iii) All refrigerated piping shall conform to the Refrigeration Piping Code, American National Standards Institute, B31.5-1966 with addenda B31.1a-1968, which is incorporated by reference as specified in § 1910.6, as it applies to ammonia.
(iv) Piping used on non-refrigerated systems shall be at least American Society for Testing and Materials (ASTM) A-53-69 Grade B Electric Resistance Welded and Electric Flash Welded Pipe, which is incorporated by reference as specified in § 1910.6, or equal. Such pipe shall be at least schedule 40 when joints are welded, or welded and flanged. Such pipe shall be at least schedule 80 when joints are threaded. Threaded connections shall not be back-welded. Brass, copper, or galvanized steel pipe shall not be used. Open (b)(7)(iv)
(v) Tubing made of brass, copper, or other material subject to attack by ammonia shall not be used.
(vi) Cast iron fittings shall not be used but this shall not prohibit the use of fittings made specifically for ammonia service of malleable, nodular, or high strength gray iron meeting American Society for Testing and Materials (ASTM) A47-68, ASTM 395-68, or ASTM A126-66 Class B or C all of which are incorporated by reference as specified in § 1910.6.
(vii) Joint compounds shall be resistant to ammonia.
Source: eCFR, text current as of 2026-10-15. Read all of 1910.111.
Where and how often it was cited
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A 5-minute crew talk on 1910.111(b)(7), plus alerts when this rule changes. Free.
OSHA interpretation letters
Related parts of this rule
- 1910.111(b) Basic rules 7 citations
- 1910.111(b)(12) Transfer of liquids 1 citations
- 1910.111(b)(12)(ii) 1 citations
- 1910.111(b)(7)(iv)
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Sources
- 29 CFR 1910.111 (eCFR), text current as of 2026-10-15
- U.S. Department of Labor enforcement data: OSHA inspections, citations and accident records, copied nightly; data as of 2026-10-20
3-year window. Federal OSHA only; state-plan rules are not counted. Plain-language text is a summary, not legal advice; the official text controls. Black Belt Safety is not part of OSHA or the Department of Labor.