Boekel Scientific 25515016 Cement Autoclave - Manual (Page 9)

4.6 Final Cooling of Specimens:
After opening the cylinder, place the test specimens in water at a temperature above
194° F (90° C). Cool the water surrounding the specimens at a uniform rate by adding
cold water so that the temperature of the water will be lowered to 74° F (23° C) in 15
minutes. Maintain the water surrounding the specimens at 74° F for an additional 15
minutes, then surface dry the specimens.
As soon as the bars are removed from the cylinder, the water remaining at the bottom
should be removed and the interior of the cylinder wiped clean and dry to reduce
incrustation and corrosion.
5. Maintenance
5.1 Safety Valve:
It is strongly recommended that a spare Safety Valve be purchased (Boekel Model No.
NP16016). Once a year the valve should be removed and replaced with the spare valve.
The used valve should be sent to the valve manufacturer for cleaning, adjusting, and
setting. Upon its return, the valve may be kept as a spare. Modification or use of non-
approved safety valves is strictly prohibited.
The valve seat has been specially ground to be pressure-tight at the normal working
pressure of 295 PSIG, which is 55 PSIG below the 350 PSIG release setting. It is
possible however, that a valve will leak slightly, particularly if it has been lifted from its
seat. If leaks develop, lift the valve from its seat (by means of hand operated lifting lever)
and brush the valve and seat bearing surfaces with a moderately thick soap solution. In
reseating the valve, the lifting lever should be lowered gradually and should never be
allowed to snap back into position. DO NOT MAKE THIS ADJUSTMENT WHEN
STEAM PRESSURE IS UP.
NOTE: The safety valve on the autoclave may or may not have this lever depending on
the style available at the time of manufacture.
5.2 Pilot Light:
Pilot lights may become loose in transit; they can be tightened after unscrewing the
chrome-plated cover and replaced with a Boekel No. NP 20250 Neon Glow Lamps.
5.3 Heater Replacement:
Should it become necessary to replace the autoclave heating unit, contact the Boekel
Customer Service Department to obtain authorization to return the autoclave. The heater
can only be replaced at the factory.
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