---
kind: "section"
citation: "49 C.F.R. § 192.63"
title: "49"
number: "192.63"
heading: "Marking of materials."
url: "https://uscodex.org/cfr/49/192.63"
---

# §192.63. Marking of materials.

- (a) Except as provided in paragraph [(d)](#d) and [(e)](#e) of this section, each valve, fitting, length of pipe, and other component must be marked as prescribed in the specification or standard to which it was manufactured.
- (b) Surfaces of pipe and components that are subject to stress from internal pressure may not be field die stamped.
- (c) If any item is marked by die stamping, the die must have blunt or rounded edges that will minimize stress concentrations.
- (d) [Paragraph (a)](#a) of this section does not apply to items manufactured before November 12, 1970, that meet all of the following:
  - (1) **The item is identifiable as to type, manufacturer, and model.**
  - (2) Specifications or standards giving pressure, temperature, and other appropriate criteria for the use of items are readily available.
- (e) All plastic pipe and components must also meet the following requirements:
  - (1) All markings on plastic pipe prescribed in the listed specification and the requirements of [paragraph (e)(2)](#e-2) of this section must be repeated at intervals not exceeding two feet.
  - (2) Plastic pipe and components manufactured after December 31, 2019 must be marked in accordance with the listed specification.
  - (3) All physical markings on plastic pipelines prescribed in the listed specification and [paragraph (e)(2)](#e-2) of this section must be legible until the time of installation.

## Notes

### Amendments

[Amdt. 192-1, 35 FR 17660, Nov. 17, 1970, as amended by Amdt. 192-31, 43 FR 883, Apr. 3, 1978; Amdt. 192-61, 53 FR 36793, Sept. 22, 1988; Amdt. 192-62, 54 FR 5627, Feb. 6, 1989; Amdt. 192-61A, 54 FR 32642, Aug. 9, 1989; 58 FR 14521, Mar. 18, 1993; Amdt. 192-76, 61 FR 26122, May 24, 1996; 61 FR 36826, July 15, 1996; Amdt. 192-114, 75 FR 48603, Aug. 11, 2010; Amdt. 192-119, 80 FR 180, Jan. 5, 2015; Amdt. 192-124, 83 FR 58716, Nov. 20, 2018]

### Authority

Authority: 30 U.S.C. 185(w)(3), 49 U.S.C. 5103, 60101 et. seq., and 49 CFR 1.97.

### Source

Source: 35 FR 13257, Aug. 19, 1970, unless otherwise noted.

### Amendments

[Amdt. 192-1, 35 FR 17660, Nov. 17, 1970, as amended by Amdt. 192-31, 43 FR 883, Apr. 3, 1978; Amdt. 192-61, 53 FR 36793, Sept. 22, 1988; Amdt. 192-62, 54 FR 5627, Feb. 6, 1989; Amdt. 192-61A, 54 FR 32642, Aug. 9, 1989; 58 FR 14521, Mar. 18, 1993; Amdt. 192-76, 61 FR 26122, May 24, 1996; 61 FR 36826, July 15, 1996; Amdt. 192-114, 75 FR 48603, Aug. 11, 2010; Amdt. 192-119, 80 FR 180, Jan. 5, 2015; Amdt. 192-124, 83 FR 58716, Nov. 20, 2018]