# Internal corrosion control: Monitoring.

**Citation:** 49 CFR 192.477  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

If corrosive gas is being transported, coupons or other suitable means must be used to determine the effectiveness of the steps taken to minimize internal corrosion. Each coupon or other means of monitoring internal corrosion must be checked two times each calendar year, but with intervals not excee

## Document text

If corrosive gas is being transported, coupons or other suitable means must be used to determine the effectiveness of the steps taken to minimize internal corrosion. Each coupon or other means of monitoring internal corrosion must be checked two times each calendar year, but with intervals not exceeding 7 1/2 months.

[Amdt. 192-33, 43 FR 39390, Sept. 5, 1978]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-192.477>
- Source ID: `ecfr`
- SHA-256: `1e01e72cffce5c8c1326ec72ceda8f1a58e897876e35063731fbb30adb0b4e40`
- Retrieved: 2026-08-20T05:54:34.435Z
- Exported: 2026-08-23T16:39:45.576Z
- Document slug: `49-cfr-192-477`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "192",
  "section": "192.477",
  "subpart": "Subpart I—Requirements for Corrosion Control",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```