---
kind: "section"
citation: "40 C.F.R. § 63.984"
title: "40"
number: "63.984"
heading: "Fuel gas systems and processes to which storage vessel, transfer rack, or equipment leak regulated material emissions are routed."
url: "https://uscodex.org/cfr/40/63.984"
---

# §63.984. Fuel gas systems and processes to which storage vessel, transfer rack, or equipment leak regulated material emissions are routed.

- (a) **Equipment and operating requirements for fuel gas systems and processes.**
  - (1) Except during periods of start-up, shutdown and malfunction as specified in the referencing subpart, the fuel gas system or process shall be operating at all times when regulated material emissions are routed to it.
  - (2) The owner or operator of a transfer rack subject to the provisions of this subpart shall ensure that no pressure relief device in the transfer rack's system returning vapors to a fuel gas system or process shall open to the atmosphere during loading. Pressure relief devices needed for safety purposes are not subject to this paragraph.
- (b) **Fuel gas system and process compliance assessment.**
  - (1) If emissions are routed to a fuel gas system, there is no requirement to conduct a performance test or design evaluation.
  - (2) If emissions are routed to a process, the regulated material in the emissions shall meet one or more of the conditions specified in [paragraphs (b)(2)(i) through (iv)](#b-2-i..b-2-iv) of this section. The owner or operator of storage vessels subject to this paragraph shall comply with the compliance demonstration requirements in [paragraph (b)(3)](#b-3) of this section.
    - (i) Recycled and/or consumed in the same manner as a material that fulfills the same function in that process;
    - (ii) Transformed by chemical reaction into materials that are not regulated materials;
    - (iii) Incorporated into a product; and/or
    - (iv) **Recovered.**
  - (3) To demonstrate compliance with [paragraph (b)(2)](#b-2) of this section for a storage vessel, the owner or operator shall prepare a design evaluation (or engineering assessment) that demonstrates the extent to which one or more of the conditions specified in [paragraphs (b)(2)(i) through (iv)](#b-2-i..b-2-iv) of this section are being met.
- (c) **Statement of connection.** For storage vessels and transfer racks, the owner or operator shall submit the statement of connection reports for fuel gas systems specified in [§ 63.999(b)(1)(ii)](/cfr/40/63.999.md?p=b-1-ii), as appropriate.

## Notes

### Source

Source: 64 FR 34866, June 29, 1999, unless otherwise noted.

### Authority

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

### Source

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