# Soda acid · stainless steel shell · Hydrostatic test · OSHA 29 CFR 1910.157 — Fire extinguisher inspection, maintenance and hydrostatic test intervals by agent type

For Soda acid · stainless steel shell · Hydrostatic test · OSHA 29 CFR 1910.157, extinguishing agent / type is Soda acid; shell material qualifier is stainless steel shell; service obligation is Hydrostatic test; interval is 5; authority is OSHA 29 CFR 1910.157, recorded from its source on 2026-08-19.

- **Extinguishing agent / type:** Soda acid _(verified: appears in the quote below)_
- **Shell material qualifier:** stainless steel shell _(verified: appears in the quote below)_
- **Service obligation:** Hydrostatic test _(our reading, not quoted from the source)_
- **Interval:** 5 _(verified: appears in the quote below)_
- **Authority:** OSHA 29 CFR 1910.157 _(our reading, not quoted from the source)_
- **Section:** Table L-1 _(verified: appears in the quote below)_

## What the source says

> The employer shall assure that portable extinguishers are hydrostatically tested at the intervals listed in Table L-1 of this section, except under any of the following conditions: ( i ) When the unit has been repaired by soldering, welding, brazing, or use of patching compounds; ( ii ) When the cylinder or shell threads are damaged; ( iii ) When there is corrosion that has caused pitting, including corrosion under removable name plate assemblies; ( iv ) When the extinguisher has been burned in a fire; or ( v ) When a calcium chloride extinguishing agent has been used in a stainless steel shell. ( 3 ) In addition to an external visual examination, the employer shall assure that an internal examination of cylinders and shells to be tested is made prior to the hydrostatic tests. Table L-1 Type of extinguishers | Test interval (years) | Soda acid (soldered brass shells) (until 1/1/82) | ( 1 ) | Soda acid (stainless steel shell) | 5

## Source

- https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-L/section-1910.157

Last verified: 2026-08-19. Review by: 2027-08-19.
Part of [Fire extinguisher inspection, maintenance and hydrostatic test intervals by agent type](https://referencesource.org/fire-extinguisher-inspection-testing-intervals-by-type/).