---
kind: "section"
citation: "46 C.F.R. § 174.335"
title: "46"
number: "174.335"
heading: "Watertight doors."
url: "https://uscodex.org/cfr/46/174.335"
---

# §174.335. Watertight doors.

- (a) Each hopper dredge must have sliding watertight doors (Class 3) approved under [§ 170.270](/cfr/46/170.270.md) of this chapter if the sill for the door is—
  - (1) Installed below the bulkhead deck; and
  - (2) Less than 24 inches above the final waterline as shown by the calculations required by [§ 174.310](/cfr/46/174.310.md) in each damage condition up to and including the maximum amount of assumed damage.
- (b) Each hopper dredge must have sliding watertight doors (Class 3) approved under [§ 170.270](/cfr/46/170.270.md) of this chapter, or quick acting hinged watertight doors (Class 1) approved under the same subpart if the sill of the watertight door is—
  - (1) Installed below the bulkhead deck; and
  - (2) Greater than 24 inches above the final waterline as shown by the calculations required by [§ 174.310](/cfr/46/174.310.md) in each damage condition up to and including the maximum amount of assumed damage.

## Notes

### Amendments

[CGD 76-080, 54 FR 36977, Sept. 6, 1989, as amended by CGD 95-072, 60 FR 50468, Sept. 29, 1995]

### Source

Source: CGD 76-080, 54 FR 36977, Sept. 6, 1989, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 9118, 9119, 9153; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 0170.1. Section 174.180 also issued under sec. 617, Pub. L. 111-281, 124 Stat. 2905.

### Source

Source: CGD 79-023, 48 FR 51048, Nov. 4, 1983, unless otherwise noted.

### Amendments

[CGD 76-080, 54 FR 36977, Sept. 6, 1989, as amended by CGD 95-072, 60 FR 50468, Sept. 29, 1995]