FED-STD-791D
e. Oil system, recirculating, 4-L (l-gal) capacity sump, equipped with 3.8 L/min (l
gpm) pump and bypass line to sump, to circulate 1.9-2.3 L/min (0.5-0.6 gpm) of
test lubricant to support and test bearings.
f. Oil temperature control. A thermistor (L) or other suitable temperature sensing
device mounted to contact steel shell of upper half of test bearing; this controls
the sump heater.
Bearing temperature is monitored by spring-loaded
thermocouple (M) in contact with steel shell of upper half of test bearing.
Temperature of oil supply to bearing is monitored from thermocouple (P).
High-temperature cutoff switch (C) to sump is to insure against overheating of
oil. Temperature of oil in sump is recorded from thermocouple (D). High
temperature cutoff in the recorder is set for 150C (300F).
NOTE 1:
A suitable cover for the machine is useful for controlling temperatures
during winter months. A wooden box can be used. Thermocouples placed
inside and outside the box serve for recording these ambient temperatures.
g. Oil flow rate and pressure control. Oil supply to bearings (sum of oil flow to
three bearings) is observed at flowrater (T). Oil supply pressure to bearings is
observed on gage (Q). A minimum oil pressure to bearings of 13.7 gage kPa (2
psig) pressure is insured by low- pressure cutoff switch (S).
Detailed drawings of test equipment may be obtained from US Navy
NOTE 2:
Marine Engineering Laboratory, Annapolis, MD.
4.2 The properties of the new lubricating oil will be determined as follows:
a. Viscosity in cSt at 38C (100F), 54C (130F), and 99C (210F), by
method D 445, ASTM Standards.
b. Carbon residue, percent, by method D 524, ASTM Standards.
c. Total acid number by method D 974, ASTM Standards.
5. MATERIALS
5.1 CAUTION - SOME MATERIALS ARE TOXIC AND HAZARDOUS. The
chemical materials listed in this section must be handled carefully. Federal Test Method
10000, Material Handling Safety Precautions, is a reference which lists all toxic and
hazardous materials cited in FTMS 791. The synonyms, life hazard, flammability,
handling and storage precautions, emergency treatment and measures, and spill practices
of each chemical are explained.
5.2 Naphtha; aliphatic (TT-N-95), type II [1,4,0].
6. PROCEDURE
6.1 Determine and record the following properties of the new lubricating oil:
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