---
kind: "section"
citation: "40 C.F.R. § 60.482-6a"
title: "40"
number: "60.482-6a"
heading: "Standards: Open-ended valves or lines."
url: "https://uscodex.org/cfr/40/60.482-6a"
---

# §60.482-6a. Standards: Open-ended valves or lines.

- (a)
  - (1) Each open-ended valve or line shall be equipped with a cap, blind flange, plug, or a second valve, except as provided in [§ 60.482-1a(c)](/cfr/40/60.482-1a.md?p=c) and paragraphs [(d)](#d) and [(e)](#e) of this section.
  - (2) The cap, blind flange, plug, or second valve shall seal the open end at all times except during operations requiring process fluid flow through the open-ended valve or line.
- (b) Each open-ended valve or line equipped with a second valve shall be operated in a manner such that the valve on the process fluid end is closed before the second valve is closed.
- (c) When a double block-and-bleed system is being used, the bleed valve or line may remain open during operations that require venting the line between the block valves but shall comply with [paragraph (a)](#a) of this section at all other times.
- (d) Open-ended valves or lines in an emergency shutdown system which are designed to open automatically in the event of a process upset are exempt from the requirements of paragraphs [(a)](#a), [(b)](#b), and [(c)](#c) of this section.
- (e) Open-ended valves or lines containing materials which would autocatalytically polymerize or would present an explosion, serious overpressure, or other safety hazard if capped or equipped with a double block and bleed system as specified in [paragraphs (a) through (c)](#a..c) of this section are exempt from the requirements of [paragraphs (a) through (c)](#a..c) of this section.

## Notes

### Source

Source: 72 FR 64883, Nov. 16, 2007, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 36 FR 24877, Dec. 23, 1971, unless otherwise noted.