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Figure 2-16. Gum Apparatus Cabinet. (Unit No. 6)
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TM-5-6640-214-14 Petroleum Base Laboratory Assembly NSN
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Figure 2-17. Water Still Cabinet (Unit No. 7)
TM 5-6640-214-14
(c) For detailed description of test procedure, refer to applicable petroleum testing reference.
(d) Preventive Maintenance. Clean exterior of baths by using a clean cloth and mild soap-and-water
solution. Clean allied equipment using standard solvent PD 680. Drain and clean baths periodically. Check to make
sure that all electrical connections are tight.
WARNING
Most cleaning solvents are hazardous. Avoid prolonged skin contact and breathing of vapors.
Check container label for warnings.
2-14. WATER STILL CABINET.
a. Component Parts. The water still cabinet (fig. 2-17) consists of a water still, permanently mounted on top of the
elevating platform; an automatic cutoff; and a 5-gallon capacity (18.93 L) distilled water bottle.
b. Operation. Make certain elevating platform is properly raised and locked in position before starting operation.
(1) Remove automatic cutoff from cabinet and hang on pipe rack of adjacent unit to left of water still. Connect
electric cord to water still heater and automatic level control, and connect cord to electric power outlet.
(2) Connect water inlets to still; connect condenser to waterline, and connect overflow to drain.
(3) Connect rubber tubing to distilled water outlet and run through hole in top of cabinet. Connect tubing to 5-
gallon capacity distilled water bottle in cabinet.
(4) Open water valves to still and turn on water still heater and automatic cutoff.
c. Preventive Maintenance.
(1) Repair or replacement. Do not attempt other than organization preventive maintenance. If heater element
burns out it must be replaced. Other defective parts of water-still must be replaced or turned in to higher echelon for
repair.
(2) Cleaning. Remove dome cover of water-still after daily use, and wipe away accumulated soft sludge. If
sludge has hardened into a crust, leave a dilute (about 10 percent) solution of acetic acid in the evaporator overnight.
After this treatment, operate still for about 2 hours to remove all traces of acid. Make sure that no distilled water
produced during this period is used.
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