---
kind: "section"
citation: "40 C.F.R. § 63.166"
title: "40"
number: "63.166"
heading: "Standards: Sampling connection systems."
url: "https://uscodex.org/cfr/40/63.166"
---

# §63.166. Standards: Sampling connection systems.

- (a) Each sampling connection system shall be equipped with a closed-purge, closed-loop, or closed-vent system, except as provided in [§ 63.162(b)](/cfr/40/63.162.md?p=b) of this subpart. Gases displaced during filling of the sample container are not required to be collected or captured.
- (b) Each closed-purge, closed-loop, or closed-vent system as required in [paragraph (a)](#a) of this section shall:
  - (1) Return the purged process fluid directly to the process line; or
  - (2) Collect and recycle the purged process fluid to a process; or
  - (3) Be designed and operated to capture and transport the purged process fluid to a control device that complies with the requirements of [§ 63.172](/cfr/40/63.172.md) of this subpart; or
  - (4) Collect, store, and transport the purged process fluid to a system or facility identified in paragraph [(b)(4)(i)](#b-4-i), [(ii)](#b-4-ii), or [(iii)](#b-4-iii) of this section.
    - (i) A waste management unit as defined in [§ 63.111](/cfr/40/63.111.md) of [subpart G](/cfr/40/subpartG.md) of this part, if the waste management unit is subject to, and operated in compliance with the provisions of [subpart G](/cfr/40/subpartG.md) of this part applicable to group 1 wastewater streams. If the purged process fluid does not contain any organic HAP listed in Table 9 of [subpart G of part 63](/cfr/40/part63-subpartG.md), the waste management unit need not be subject to, and operated in compliance with the requirements of [40 CFR part 63](/cfr/40/part63.md), [subpart G](/cfr/40/subpartG.md) applicable to group 1 wastewater streams provided the facility has an NPDES permit or sends the wastewater to an NPDES permitted facility.
    - (ii) A treatment, storage, or disposal facility subject to regulation under 40 CFR part [262](/cfr/40/part262.md), [264](/cfr/40/part264.md), 265, or 266; or
    - (iii) A facility permitted, licensed, or registered by a State to manage municipal or industrial solid waste, if the process fluids are not hazardous waste as defined in [40 CFR part 261](/cfr/40/part261.md).
- (c) **In-situ—** sampling systems and sampling systems without purges are exempt from the requirements of paragraphs [(a)](#a) and [(b)](#b) of this section.

## Notes

### Amendments

[59 FR 19568, Apr. 22, 1994, as amended at 61 FR 31439, June 20, 1996]

### Source

Source: 59 FR 19568, Apr. 22, 1994, unless otherwise noted.

### Authority

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

### Source

Source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.

### Amendments

[59 FR 19568, Apr. 22, 1994, as amended at 61 FR 31439, June 20, 1996]