30 CFR § 7.101
Surface temperature tests.
The test for determination of exhaust gas cooling efficiency
described in § 7.102
may be done simultaneously with this test.
(a) Test procedures. (1) Prepare to test the diesel power package
(i) Perform a detailed check of parts against the drawings and
specifications submitted to MSHA under compliance with § 7.97 to
determine that the parts and drawings agree.
(ii) Fill the coolant system with a mixture of equal parts of
antifreeze and water, following the procedures specified in the
application, § 7.97
(iii) If a wet exhaust conditioner is used to cool the exhaust gas,
fill the exhaust conditioner to the high or normal operating water
level and have a reserve water supply available, if applicable.
(2) Tests shall be conducted as follows:
(i) The engine shall be set to the rated horsepower specified in
(ii) Install sufficient temperature measuring devices to determine
the location of the highest coolant temperature. The temperature
measuring devices shall be accurate to ± 4 deg.F
(± 2 deg.C).
(iii) Operate the engine at rated horsepower and with
0.5 ± 0.1 percent,
by volume, of methane in the intake air mixture until all parts of the
engine, exhaust coolant system, and other components reach their
respective equilibrium temperatures. The liquid fuel temperature into
the engine shall be maintained at 100 deg.F (38 deg.C) ± 10
deg.F (6 deg.C) and the intake air temperature shall be maintained at
70 deg.F (21 deg.C) ± 5 deg.F (3 deg.C).
(iv) Increase the coolant system temperatures until the highest
coolant temperature is 205 deg.F to 212 deg.F (96 deg.C to 100
deg.C), or to the maximum temperature specified by the applicant, if
(v) After all coolant system temperatures stabilize, operate the
engine for 1 hour.
(vi) The ambient temperature shall be between 50 deg.F (10 deg.C)
and 104 deg.F (40 deg.C) throughout the tests.
(b) Acceptable performance. The surface temperature of any external
surface of the diesel power package shall not exceed 302 deg.F (150
deg.C) during the test.