[Code of Federal Regulations]

[Title 30, Volume 1]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 30CFR35.21]



[Page 174]

 

                       TITLE 30--MINERAL RESOURCES

 

  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR

 

PART 35_FIRE-RESISTANT HYDRAULIC FLUIDS--Table of Contents

 

                       Subpart B_Test Requirements

 

Sec.  35.21  Temperature-pressure spray-ignition tests.



    (a) Purpose. The purpose of this test shall be to determine the 

flammability of a hydraulic fluid when it is sprayed over three 

different sources of ignition which are described in paragraph (b)(4) of 

this section.

    (b) Description of apparatus. (1) A 3-quart pressure vessel, with 

the necessary connections, valves, and heating elements, shall be used 

for containing and heating the fluid under the test conditions as 

specified hereinafter.

    (2) An atomizing round-spray nozzle, having a discharge orifice of 

0.025-inch diameter, capable of discharging 3.28 gallons of water per 

hour with a spray angle of 90 degrees at a pressure of 100 p.s.i., shall 

be connected to the pressure vessel.

    (3) A commercial pressurized cylinder, containing nitrogen with the 

customary regulators, valves, tubing, and connectors, shall be used to 

supply nitrogen to the pressure vessel described in paragraph (b) (1) of 

this section.

    (4) Three igniting devices shall provide three different sources of 

ignition as follows:

    (i) A metal trough with a metal cover in which cotton waste soaked 

in kerosene is ignited.

    (ii) An electric arcing device in which the arc is produced by a 

12,000-volt transformer.

    (iii) A propane torch--Bernzomatic or equivalent.

    (5) A means of measuring distances from the nozzle tip to the 

igniting device shall be provided.

    (c) Test procedures. (1) A 2\1/2\-quart sample of the fluid shall be 

poured into the pressure vessel and heated to a temperature of 150 

[deg]F. The temperature shall be maintained at not less than 145 [deg]F. 

or not more than 155 [deg]F. during the test.

    (2) Nitrogen shall be introduced into the vessel at 150 p.s.i.g.

    (3) The fluid shall be sprayed at each igniting device, described in 

paragraph (b) (4) of this section, which is moved along the trajectory 

of the spray. Each igniting device shall be held in the spray at 

different distances from the nozzle tip for one minute or until the 

flame or arc is extinguished (if less than one minute) to determine this 

fire-resistant characteristic of the fluid.

    (d) Appraisal of tests. If the test procedures in paragraph (c) of 

this section do not result in an ignition of any sample of fluid or if 

an ignition of a sample does not result in flame propagation for a time 

interval not exceeding 6 seconds at a distance of 18 inches or more from 

the nozzle tip to the center of each igniting device, it shall be 

considered fire resistant, according to the test requirements of this 

section.