---
kind: "section"
citation: "46 C.F.R. § 182.422"
title: "46"
number: "182.422"
heading: "Integral and non-integral keel cooler installations."
url: "https://uscodex.org/cfr/46/182.422"
---

# §182.422. Integral and non-integral keel cooler installations.

- (a) A keel cooler installation used for engine cooling must be designed to prevent flooding.
- (b) Except as provided in [paragraph (e)](#e), a shutoff valve must be located where the cooler piping penetrates the shell, as near the shell as practicable, except where the penetration is forward of the collision bulkhead.
- (c) The thickness of the inlet and discharge connections, outboard of the shutoff valves required by [paragraph (b)](#b) of this section, must be at least Schedule 80.
- (d) Short lengths of approved nonmetallic flexible hose, fixed by two hose clamps at each end of the hose, may be used at machinery connections for a keel cooler installation.
- (e) **Shutoff valves are not required for integral keel coolers.** A keel cooler is considered integral to the hull if the following conditions are satisfied:
  - (1) The cooler structure is fabricated from material of the same thickness and quality as the hull;
  - (2) The flexible connections are located well above the deepest subdivision draft;
  - (3) The end of the structure is faired to the hull with a slope no greater than 4 to 1; and
  - (4) Full penetration welds are employed in the fabrication of the structure and its attachment to the hull.

## Notes

### Amendments

[CGD 85-080, 61 FR 986, Jan. 10, 1996, as amended by USCG-2000-7790, 65 FR 58465, Sept. 29, 2000]

### Authority

Authority: 46 U.S.C. 3306; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; DHS Delegation No. 00170.1, Revision No. 01.4.

### Source

Source: CGD 85-080, 61 FR 986, Jan. 10, 1996, unless otherwise noted.

### Amendments

[CGD 85-080, 61 FR 986, Jan. 10, 1996, as amended by USCG-2000-7790, 65 FR 58465, Sept. 29, 2000]