---
kind: "section"
citation: "46 C.F.R. § 56.10-5"
title: "46"
number: "56.10-5"
heading: "Pipe."
url: "https://uscodex.org/cfr/46/56.10-5"
---

# §56.10-5. Pipe.

- (a) **General.** Pipe and tubing must be selected as described in table 1 to [§ 56.60-1](/cfr/46/56.60-1.md).
- (b) **Ferrous pipe.** ASTM A53/A53M (incorporated by reference, see [§ 56.01-2](/cfr/46/56.01-2.md)) furnace welded pipe must not be used for combustible or flammable liquids within machinery spaces. (See §§ [30.10-15](/cfr/46/30.10-15.md) and [30.10-22](/cfr/46/30.10-22.md) of this chapter for definitions of combustible and flammable liquids.)
- (c) **Nonferrous pipe.** (See also [§ 56.60-20](/cfr/46/56.60-20.md).)
  - (1) Copper and brass pipe for water and steam service may be used for design pressures up to 250 psig and for design temperatures to 406 °F.
  - (2) Copper and brass pipe for air may be used in accordance with the allowable stresses of the materials found from table 1 to [§ 56.60-1](/cfr/46/56.60-1.md).
  - (3) Copper-nickel alloys may be used for water and steam service within the design limits of stress and temperature indicated in ASME B31.1 (incorporated by reference; see [§ 56.01-2](/cfr/46/56.01-2.md)).
  - (4) Copper tubing may be used for instrument service up to 1,000 psig.
  - (5) Copper, brass, or aluminum pipe or tube must not be used for flammable fluids except where specifically permitted by this part.
  - (6) Aluminum-alloy pipe or tube along with similar junction equipment may be used within the limitation stated in 124.7 of ASME B31.1 and [paragraph (c)(5)](#c-5) of this section.
- (d) **Nonmetallic pipe.** Plastic pipe may be used subject to the conditions described in [§ 56.60-25](/cfr/46/56.60-25.md).

## Notes

### Amendments

[CGFR 68-82, 33 FR 18843, Dec. 18, 1968, as amended by CGFR 69-127, 35 FR 9978, June 17, 1970; CGFR 72-59R, 37 FR 6189, Mar. 25, 1972; CGD 77-140, 54 FR 40602, Oct. 2, 1989; CGD 95-028, 62 FR 51200, Sept. 30, 1997; USCG-2000-7790, 65 FR 58460, Sept. 29, 2000; USCG-2003-16630, 73 FR 65175, Oct. 31, 2008]

### Source

Source: CGFR 68-82, 33 FR 18843, Dec. 18, 1968, as amended by USCG-2020-0634, 89 FR 50131, June 12, 2024, unless otherwise noted.

### Authority

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.

### Source

Source: CGFR 68-82, 33 FR 18843, Dec. 18, 1968, unless otherwise noted.

### Amendments

[CGFR 68-82, 33 FR 18843, Dec. 18, 1968, as amended by CGFR 69-127, 35 FR 9978, June 17, 1970; CGFR 72-59R, 37 FR 6189, Mar. 25, 1972; CGD 77-140, 54 FR 40602, Oct. 2, 1989; CGD 95-028, 62 FR 51200, Sept. 30, 1997; USCG-2000-7790, 65 FR 58460, Sept. 29, 2000; USCG-2003-16630, 73 FR 65175, Oct. 31, 2008]