46 CFR § 56.90-10 - Threaded piping (modifies 135.5).

---
identifier: "/us/cfr/t46/s56.90-10"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 56.90-10 - Threaded piping (modifies 135.5)."
title_number: 46
title_name: "Shipping"
section_number: "56.90-10"
section_name: "Threaded piping (modifies 135.5)."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "F"
subchapter_name: "MARINE ENGINEERING"
part_number: "56"
part_name: "PIPING SYSTEMS AND APPURTENANCES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 1321(j), 1509; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; E.O. 12777, 56 FR 54757, 3 CFR, 1991 Comp., p. 351; DHS Delegation No. 00170.1, Revision No. 01.4."
regulatory_source: "CGFR 68-82, 33 FR 18843, Dec. 18, 1968, unless otherwise noted."
cfr_part: "56"
---


# 56.90-10 Threaded piping (modifies 135.5).

(a) Any compound used in threaded joints must be suitable for the service conditions and must not react unfavorably with either the service fluid or the piping materials.

(b) Threaded joints that are to be seal welded must be made up without any thread compound.

[CGFR 68-82, 33 FR 18843, Dec. 18, 1968, as amended by USCG-2003-16630, 73 FR 65185, Oct. 31, 2008]