---
kind: "section"
citation: "46 C.F.R. § 45.145"
title: "46"
number: "45.145"
heading: "Hatchway covers."
url: "https://uscodex.org/cfr/46/45.145"
---

# §45.145. Hatchway covers.

- (a) Hatchways in position 1 and 2 must have weathertight hatch covers with gaskets and clamping devices.
- (b) The maximum ultimate strength of the hatchway cover material must be at least 4.25 times the maximum stress in the structure calculated with the following assumed loads:
  - (1) **For ships 350 ft or more in length, at least 250 lb/ft 2 in position 1 and 200 lb/ft 2 in position 2.**
  - (2) **For ships less than 350 ft in length, at least <I>AL</I> in the following formula—**
    - (i) **Position 1—**
    - (ii) **Position 2—**
- (c) Hatchway covers must be so designed as to limit the deflection to not more than 0.0028 times the span under the loads described in [paragraph (b)](#b) of this section and the thickness of mild steel plating forming the tops of covers must be at least 1 percent of the spacing of stiffeners or 0.24 in, whichever is greater.

## Notes

### Authority

Authority: 46 U.S.C. 5104, 5108; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 73-49R, 38 FR 12290, May 10, 1973, unless otherwise noted.