Parr Instrument Series 4530 - Manual (Page 10)

Floor Stand Reactors
P a r r I n s t r u m e n t C o m p a n y 10
HOW TO USE THE VESSEL
Fixed Head Vessels
First, lower the heater and push it aside before at-
tempting to remove the split ring and cylinder. Raise
the cylinder support holder to the bottom of the
cylinder. Open the gas release valve to discharge
any internal pressure.
To open the Vessel
Remove the split rings. For vessels with a confi ned,
fl at PTFE gasket, loosen the six bolts. For vessels
with an O-ring closure, loosen the latches on each
side of the split rings. The split ring halves can now
be removed. The head with all attached fi ttings will
remain in place. The cylinder can now be lowered
away. Handle the cylinder carefully so as not to
damage the stirring shaft and other internals.
Before Closing the Vessel
Examine the head seal carefully to be sure that it
is in good condition. The seal should not have any
nicks or be hardened, discolored or deformed. Ex-
amine the mating surfaces on the cylinder and head
to be sure they are clean and free from burrs; then
raise the cylinder up to the head.
To Close the Vessel
Put the two split ring halves around the head and
cylinder fl anges and fasten the latches or tighten the
bolts as assembled before.
Removable Head Vessels
First, open the gas release valve to discharge any in-
ternal pressure. For vessels on a movable fl oor cart,
lift the vessel out of the heater before attempting
to remove the split ring and head. For vessels on a
stationary stand, loosen the panel screw holding the
vessel retainer, remove the vessel from the stand
and set it on a table.
To Open the Vessel
Remove the split rings. For vessels with a confi ned,
fl at PTFE gasket, loosen the six bolts. For vessels
with an O-ring closure, loosen the latches on each
side of the split rings. The split ring halves can now
be removed. The head with all attached fi ttings is
free to be lifted from the cylinder. Handle the head
carefully so as not to damage the stirring shaft and
other internals.
Before Closing the Vessel
Examine the head seal carefully to be sure that it
is in good condition. The seal should not have any
nicks or be hardened, discolored or deformed. Ex-
amine the mating surfaces on the cylinder and head
to be sure they are clean and free from burrs. Then
carefully set head on cylinder.
To Close the Vessel
Slide the two split ring halves around the cylinder
and head fl anges. If equipped with a drop band, po-
sition the split ring halves such that the indentation
for one of the halves is located 180 degrees away
from the pressure gage. Slide the drop band over
the split ring halves and tighten the set screw lightly
to hold the band in place.
For vessels on a movable fl oor cart, place the ves-
sel into the heater with the gage facing forward and
swing the drive arm into position, connecting the
rubber sleeve onto the spline coupling on the stirrer.
For vessels on a stationary stand, place the vessel
onto the midplate such that the drop band set screw
fi ts into the slot on the back of the midplate.
Note: The following steps are common to both
head confi gurations
Sealing Vessels with PTFE Gaskets
If your split ring has compression bolts, tighten each
of the bolts with the wrench furnished. Apply a fi rm
but hard pull to each bolt. Or, if a torque wrench
is available, apply 25ft-lbs to each bolt. Tightening
should proceed in a criss-cross pattern rather than
progressively around the circle. Let the vessel stand
for about fi ve minutes after the initial tightening;
then tighten the bolts again. This will compensate
for any tendency of the PTFE gasket to fl ow under
the loading pressure.
Gas Connections
Gas connections are dependent on applications.
For general usage, use the pressure hose furnished
with the reactor. Screw the Type “A” coned pressure
fi tting into the adapter attached to the gas inlet valve
and tighten the compression nut fi rmly. Do not use
any thread dope on the coned fi tting. The A495HC
pressure hose is made of reinforced Nylon that can