---
kind: "section"
citation: "40 C.F.R. § 63.854"
title: "40"
number: "63.854"
heading: "Work practice standards for potlines."
url: "https://uscodex.org/cfr/40/63.854"
---

# §63.854. Work practice standards for potlines.

- (a) **Periods of operation other than startup.** If you own or operate a new or existing primary aluminum reduction affected source, you must comply with the requirements of [paragraphs (a)(1) through (8)](#a-1..a-8) of this section during periods of operation other than startup.
  - (1) **Ensure the potline scrubbers and exhaust fans are operational at all times.**
  - (2) **Ensure that the primary capture and control system is operating at all times.**
  - (3) **Hood covers should be replaced as soon as possible after each potroom operation.**
  - (4) Inspect potlines daily and perform the work practices specified in [paragraphs (a)(4)(i) through (iii)](#a-4-i..a-4-iii) of this section.
    - (i) Identify unstable pots as soon as practicable but in no case more than 12 hours from the time the pot became unstable;
    - (ii) Reduce cell temperatures to as low as practicable, and follow the written operating plan described in [paragraph (b)(4)](#b-4) of this section if the cell temperature exceeds the specified high temperature limit; and
    - (iii) **Reseal pot crusts that have been broken as often and as soon as practicable.**
  - (5) **Ensure that hood covers fit properly and are in good condition.**
  - (6) If the exhaust system is equipped with an adjustable damper system, the hood exhaust rate for individual pots must be increased whenever hood covers are removed from a pot, provided that the exhaust system will not be overloaded by placing too many pots on high exhaust.
  - (7) Dust entrainment must be minimized during material handling operations and sweeping of the working aisles.
  - (8) Only tapping crucibles with functional aspirator air return systems (for returning gases under the collection hooding) can be used, unless the regulatory authority approves an alternative tapping crucible.
- (b) **Periods of startup.** If you own or operate a new or existing primary aluminum reduction affected source, you must comply with the requirements of paragraphs [(a)(1) through (8)](#a-1..a-8) and [(b)(1) through (4)](#b-1..b-4) of this section during periods of startup for each affected potline.
  - (1) **Develop a potline startup schedule before starting up the potline.**
  - (2) **Keep records of the number of pots started each day.**
  - (3) Inspect potlines daily and adjust pot parameters to their optimum levels, as specified in the operating plan described in [paragraph (b)(4)](#b-4) of this section, including, but not limited to: alumina addition rate, exhaust air flow rate, cell voltage, feeding level, anode current and liquid and solid bath levels.
  - (4) Prepare a written operating plan to minimize emissions during startup to include, but not limited to, the requirements in (b)(1) through (3) of this section. The operating plan must include a specified high temperature limit for pots that will trigger corrective action.

## Notes

### Amendments

[80 FR 62423, Oct. 15, 2015]

### Source

Source: 62 FR 52407, Oct. 7, 1997, unless otherwise noted.

### Authority

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

### Source

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

### Amendments

[80 FR 62423, Oct. 15, 2015]