---
kind: "section"
citation: "30 C.F.R. § 18.65"
title: "30"
number: "18.65"
heading: "Flame test of hose."
url: "https://uscodex.org/cfr/30/18.65"
---

# §18.65. Flame test of hose.

- (a) **Size of test specimen.**
  - (1) [Reserved]
  - (2) **Hose—** four specimens each 6 inches long by 1/2-inch wide by thickness of the hose.
- (b) **Flame-test apparatus.** The principal parts of the apparatus within and/or appended to a 21-inch cubical test gallery are:
  - (1) **A support stand with a ring clamp and wire gauze.**
  - (2) A Pittsburgh-Universal Bunsen-type burner (inside diameter of burner tube 11 mm.), or equivalent, mounted in a burner placement guide in such a manner that the burner may be placed beneath the test specimen, or pulled away from it by an external knob on the front panel of the test gallery.
  - (3) A variable-speed electric fan and an ASME flow nozzle (16-8 1/2 inches reduction) to attain constant air velocities at any speed between 50-500 feet a minute.
  - (4) **An electric timer or stopwatch to measure the duration of the tests.**
  - (5) A mirror mounted inside the test gallery to permit a rear view of the test specimen through the viewing door.
- (c) **Mounting of test specimen.** The specimen shall be clamped in a support with its free end centered 1 inch above the burner top. The longitudinal axis shall be horizontal and the transverse axis inclined at 45° to the horizontal. Under the test specimen shall be clamped a piece of 20-mesh iron-wire gauze, 5 inches square, in a horizontal position 1/4-inch below the pulley cover edge of the specimen and with about 1/2-inch of the specimen extending beyond the edge of the gauze.
- (d) **Procedure for flame tests.**
  - (1) The Bunsen burner, retracted from the test position, shall be adjusted to give a blue flame 3 inches in height with natural gas.
  - (2) The observation door of the gallery shall be closed for the entire test.
  - (3) The burner flame shall be applied to the free end of the specimen for 1 minute in still air.
  - (4) At the end of 1 minute the burner flame shall be removed, the ventilating fan turned on to give an air current having a velocity of 300 feet per minute, and the duration of flame measured.
  - (5) After the test specimen ceases to flame, it shall remain in the air current for at least 3 minutes to determine the presence and duration of afterglow. If a glowing specimen exhibits flame within 3 minutes the duration of flame shall be added to the duration of flame obtained according to [paragraph (d)](#d) (4) of this section.
- (e) **Test requirements.** The tests of the four specimens cut from any sample shall not result in either duration of flame exceeding an average of 1 minute after removal of the applied flame or afterglow exceeding an average of 3 minutes duration.
- (f) **Acceptance markings.**
  - (1) [Reserved]
  - (2) **Hose—** hose conduit accepted by MSHA as flame-resistant shall be marked as follows: Impressed letters, raised letters on depressed background, or printed letters with the words “Flame-Resistant, USMSHA No. ____” at intervals not exceeding 3 feet. This number will be assigned to the manufacturer after the sample has passed the tests. The letters and numbers shall be at least 1/4-inch high.

## Notes

### Amendments

[33 FR 4660, Mar. 19, 1968, as amended at 43 FR 12314, Mar. 24, 1978; 73 FR 80612, Dec. 31, 2008]

### Authority

Authority: 30 U.S.C. 957, 961.

### Source

Source: 33 FR 4660, Mar. 19, 1968, unless otherwise noted.

### Amendments

[33 FR 4660, Mar. 19, 1968, as amended at 43 FR 12314, Mar. 24, 1978; 73 FR 80612, Dec. 31, 2008]