Model 415C & 415SGS Instruction Manual
D01669102
April 2019, Revision A
37
4.
When the temperature has cooled below 212°F/100°C, release pressure on
the cylinder and the instrument by opening the PRESSURE RELEASE
valve.
5.
Loosen the pressure lines at the bulkhead and head to remove the pressure
release valve.
6.
Remove the slurry cup lock ring and slurry cup plug (head). See following
sections for more details in removing the slurry cup plug.
7.
When the cylinder is cool enough, remove the slurry from the slurry cup.
Under certain heating/cooling conditions the slurry head and
pressure vessel may be at very different temperatures. If the
slurry head is hot to the touch and the pressure vessel is cool
take extreme care in removing the slurry head as the two metals
will be more prone to seizing. Slurry head and/or pressure vessel
damage can be avoided by allowing the two temperatures to
equalize somewhat before removal of slurry head.
7.3 Thermocouple Retainer
On some pressure vessels the bottom has a threaded thermocouple retainer which
must be used correctly to help prevent the thermocouple probe from falling out.
The assembly includes a threaded 10/32 set screw with a hole drilled through it and
an o-ring as shown below. The o-ring is squeezed tight around the thermocouple
probe by tightening the set screw. The thermocouple probe may be inserted or
removed while the o-ring is still good. The o-ring may be required to be changed
after a high temperature test or when after tightening the set screw further and the
o-ring fails to grab onto the thermocouple probe.
Figure 7-1 Screw with hole and o-ring