---
kind: "section"
citation: "40 C.F.R. § 63.5121"
title: "40"
number: "63.5121"
heading: "What operating limits must I meet?"
url: "https://uscodex.org/cfr/40/63.5121"
---

# §63.5121. What operating limits must I meet?

- (a) Except as provided in [paragraph (b)](#b) of this section, for any coil coating line for which you use an add-on control device, unless you use a solvent recovery system and conduct a liquid-liquid material balance according to [§ 63.5170(e)(1)](/cfr/40/63.5170.md?p=e-1), you must meet the applicable operating limits specified in Table 1 to this subpart. You must establish the operating limits during performance tests according to the requirements in [§ 63.5160(d)(3)](/cfr/40/63.5160.md?p=d-3) and Table 1 to [§ 63.5160](/cfr/40/63.5160.md). You must meet the operating limits established during the most recent performance test required in [§ 63.5160](/cfr/40/63.5160.md) at all times after you establish them.
- (b) If you use an add-on control device other than those listed in Table 1 to this subpart, or wish to monitor an alternative parameter and comply with a different operating limit, you must apply to the Administrator for approval of alternative monitoring under [§ 63.8(f)](/cfr/40/63.8.md?p=f).

## Notes

### Amendments

[67 FR 39812, June 10, 2002, as amended at 85 FR 10862, Feb. 25, 2020]

### Source

Source: 67 FR 39812, June 10, 2002, unless otherwise noted.

### Authority

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

### Source

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

### Amendments

[67 FR 39812, June 10, 2002, as amended at 85 FR 10862, Feb. 25, 2020]