[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR35.21]

[Page 163-164]
 
                       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:

[[Page 164]]

    (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.