30 CFR § 35.22 Test to determine effect of evaporation on flammability.
(a)Purpose. The purpose of this test shall be to determine
the effect of evaporation on the reduction of fire resistance of a hydraulic
fluid.
(b) Description of apparatus--(1) Petri dish.
Standard laboratory Petri dishes, approximately 90 mm. by 16 mm., shall be
used to contain the test samples.
(2)Oven. A gravity convection air oven, capable of
maintaining the specified evaporation temperature constant within ±2°F.,
shall be used in the test.
(3)Pipe cleaner. An ordinary smoker's pipe
cleaner (U.S. Tobacco Co., Dill's or equivalent) shall be used in the test
procedure, described in paragraph (c) of this section.
(c)Test procedures. (1) Three 30-milliliter samples of the
fluid shall be placed in uncovered Petri dishes. Two of these samples shall
be inserted in the oven, that shall have been heated to a temperature of
150° F., ±2°F., which shall be maintained throughout this test. The third
sample shall remain at room temperature.
(2) An electrically operated cycling device, such as an
automobile windshield wiper mechanism, shall be oscillated in a horizontal
plane, 25 ±2 cycles per minute. A pipe cleaner shall be attached to the device
so that it will enter and leave a flame of a standard (Bunsen or equivalent)
laboratory burner, which is adjusted to provide a nonluminous flame
approximately 4 inches in height without forming a sharp inner cone. The
cycling device shall be so arranged that when a 2-inch length of pipe cleaner
is attached thereto the exposed end shall describe an arc with a radius of 4
inches ±1/8 inch. The cycling device shall be so arranged that when the
2-inch length of pipe cleaner is attached thereto, its midpoint shall be in
the center of the flame at one extreme end of the cycle.
(3) Each of five 2-inch lengths of pipe cleaner shall be
soaked separately for a period of 2 minutes in the test sample that remained
at room temperature. Each pipe cleaner shall then be removed from the test
sample and permitted to drain freely until all excess fluid is expelled from
it. Each soaked pipe cleaner shall be attached to the cycling device, the
mechanism started, and the pipe cleaner permitted to enter and leave the
burner flame, as described in paragraph (c)(2) of this section, until a
self-sustaining flame shall be observed on the pipe cleaner. The number of
cycles necessary to obtain a self-sustaining flame shall be noted and
averaged for each of the five soaked pipe cleaners.
(4) After one test sample has remained in the oven for a
period of 2 hours, the Petri dish containing it shall be removed from the
oven and allowed to cool to room temperature, after which 5 lengths of 2-inch
pipe cleaner shall be soaked separately in the test sample for a period of 2
minutes. Then the test procedure stated in paragraph (c)(3) of this section
shall be repeated.
(5) After one test sample has remained in the oven for a
period of 4 hours, the Petri dish containing it shall be removed from the
oven and allowed to cool to room temperature, after which 5 lengths of 2-inch
pipe cleaner shall be soaked separately in the test sample for a period of 2
minutes. Then the test procedure stated in paragraph (c)(3) of this section
shall be repeated.
(d)Appraisal of tests. To be determined as fire resistant
according to the test requirements of this section, the three following
results shall be achieved:
(1) The average number of cycles before attaining a
self-sustaining flame in the test described in paragraph (c)(3) of this
section shall be 24 or more.
(2) The average number of cycles before attaining a
self-sustaining flame in the test described in paragraph (c)(4) of this
section shall be 18 or more.
(3) The average number of cycles before attaining a
self-sustaining flame in the test described in paragraph (c)(5) of this
section shall be 12 or more.
