---
kind: "section"
citation: "46 C.F.R. § 52.01-100"
title: "46"
number: "52.01-100"
heading: "Openings and compensation (modifies PG-32 through PG-39, PG-42 through PG-55)."
url: "https://uscodex.org/cfr/46/52.01-100"
---

# §52.01-100. Openings and compensation (modifies PG-32 through PG-39, PG-42 through PG-55).

- (a) The rules for openings and compensation must be as indicated in PG-32 through PG-55 of Section I of the ASME BPVC (incorporated by reference; see [§ 52.01-1](/cfr/46/52.01-1.md)) except as noted otherwise in this section.
- (b) (Modifies PG-39.) Pipe and nozzle necks must be attached to vessel walls as indicated in PG-39 of Section I of the ASME BPVC except that threaded connections must not be used under any of the following conditions:
- (c) (Modifies PG-42.) Butt-welding flanges and fittings must be used when full radiography is required by [§ 56.95-10](/cfr/46/56.95-10.md) of this subchapter.

## Notes

### Amendments

[CGD 81-79, 50 FR 9432, Mar. 8, 1985, as amended by USCG-2003-16630, 73 FR 65161, Oct. 31, 2008]

### Authority

Authority: 46 U.S.C. 3306, 3307, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.3.

### Source

Source: CGFR 68-82, 33 FR 18815, Dec. 18, 1968, as amended by USCG-2020-0634, 89 FR 50095, June 12, 2024, unless otherwise noted.

### Amendments

[CGD 81-79, 50 FR 9432, Mar. 8, 1985, as amended by USCG-2003-16630, 73 FR 65161, Oct. 31, 2008]