---
kind: "section"
citation: "46 C.F.R. § 59.10-35"
title: "46"
number: "59.10-35"
heading: "Wrapper plates and back heads."
url: "https://uscodex.org/cfr/46/59.10-35"
---

# §59.10-35. Wrapper plates and back heads.


Wrapper plates and back heads may be renewed in whole or repaired as follows:

- (a) Wrapper plates or back heads must be cut between two rows of staybolts or on a line of staybolts where the thickness is approximately the same as the original construction. If welding is employed on a line of staybolts, the staybolts must be fitted with a welded collar.
- (b) The edges of wrapper plates riveted to tube sheets and back heads must be removed by cutting out the rivets.
- (c) The edges of existing plates and new plates must be beveled by chipping, flame cutting or grinding so as to form a suitable groove whereby complete penetration of the weld metal will be obtained. The edge preparation and preheat must comply with the requirements of [§ 59.10-5(h)](/cfr/46/59.10-5.md?p=h).
- (d) The edges of the new plate must be butt-welded, and the plate must be riveted to the flanges of the tube sheet and back heads and the staybolts renewed.
- (e) Sections of wrapper plates of combustion chambers outside of stayed areas may be repaired by welding provided the welded joints are stress-relieved by means of controlled heat and the joints are nondestructively tested.

## Notes

### Authority

Authority: 46 U.S.C. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 227; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.3.

### Source

Source: CGFR 68-82, 33 FR 18887, Dec. 18, 1968, as amended by USCG-2020-0634, 89 FR 50183, June 12, 2024, unless otherwise noted.