FED-STD-791D
6.6 Weigh a clean coking tube (within 10 mg), and record the weight. Handle by
the top to avoid contaminating coking surface.
6.7 Weigh a clean filter screen to the nearest 10 mg, and record the weight.
6.8 Clean a new coking-head diffuser stone, a new pump-shaft seal, and a
complete set of new O-rings by rinsing in isopropyl alcohol, and then in petroleum ether,
and allow them to air-dry.
6.9 Assemble clean components of the test section, installing the previously
cleaned new parts (see 6.8)
CAUTION:
Do not use compound of any type on threaded fittings, stopcocks, or
elsewhere in the system.
6.10 After assembly, check to see that all fittings are tight, all valves are in
proper position, bayonet thermocouples are "bottomed" in the coking tube, all
thermocouples are registering, and the temperature indicators on all controllers and
recorders read correct ambient temperature. (Adjust if necessary.)
6.11 Level coking head by means of adjusting screws.
6.12 Ascertain (at least once a month) that the air flowmeter is calibrated to
deliver 300 mL/min of saturated air at atmospheric pressure and 25C (77F). In
calibrating (to detect leaks in the flowmeter or line), use a definite flowmeter pressure
(preferably 69 gage kPa [10 psig]) and a wet test meter, connecting from the discharge
line of the humidifier to the inlet of the meter.
6.13 Flush the oil system as follows:
a. Charge the circulating system with unused isopropyl alcohol, and circulate for 5
min, alternating the flow several times between the filter (36, Figures 2 and 3),
and the pressure-relief bypass valve (34). This is accomplished by use of valves
(35) and (37). Drain thoroughly opening valve (37), and tubing connections as
necessary for complete venting and draining. Discard the used isopropyl
alcohol.
b. Repeat step (a) using unused petroleum ether. Drain thoroughly, and discard
used petroleum ether.
c. If the first flush of petroleum ether comes out dirty or discolored, repeat until
petroleum ether remains colorless. Drain thoroughly, and discard all used
solvents.
6.14 Check the adjustment of the system as follows:
a. Open valve (29), and charge the system with test oil through oil filler system.
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