---
kind: "section"
citation: "46 C.F.R. § 64.9"
title: "46"
number: "64.9"
heading: "Maintenance, repair, and alteration of MPTs."
url: "https://uscodex.org/cfr/46/64.9"
---

# §64.9. Maintenance, repair, and alteration of MPTs.

- (a) Each MPT must be maintained in accordance with the approved plans, this part, and [subpart 98.30](/cfr/46/subpart98.30.md) of this chapter.
- (b) **Repair of an MPT is authorized, provided that each repair is in accordance with the approved plans.**
- (c) No MPT may be altered, except with the written approval of the Commanding Officer, U.S. Coast Guard Marine Safety Center.
- (d) After each welded repair or alteration, an MPT must be hydrostatically pressure-tested in accordance with [§ 64.83(a)](/cfr/46/64.83.md?p=a).

## Notes

### Amendments

[CGD 84-043, 55 FR 37409, Sept. 11, 1990, as amended by USCG-2020-0634, 89 FR 50199, June 12, 2024]

### Authority

Authority: 46 U.S.C. 3306, 3703; 49 U.S.C. App. 1804; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.3.

### Source

Source: CGD 73-172, 39 FR 22950, June 25, 1974, unless otherwise noted.

### Amendments

[CGD 84-043, 55 FR 37409, Sept. 11, 1990, as amended by USCG-2020-0634, 89 FR 50199, June 12, 2024]