Parr Instrument Series 4550 - Manual (Page 14)

4550 Floor Stand Reactors
P a r r I n s t r u m e n t C o m p a n y 14
HOW TO USE THE VESSEL
Fixed Head Vessels
First, lower the heater and push it aside before
attempting 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 confined,
flat 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 fittings 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.
Examine 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 flanges and fasten the latches or tighten the
bolts as assembled before.
Removable Head Vessels
First, open the gas release valve to discharge any
internal pressure. For vessels on a movable floor
cart, lift the vessel out of the heater before attempt-
ing to remove the split ring and head. For vessels
on a stationary stand, loosen the panel screw hold-
ing 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 confined,
flat 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 fittings 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.
Examine 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 flanges. If equipped with a drop band,
position the split ring halves such that the indenta-
tion 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 floor cart, place the vessel
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
fits into the slot on the back of the midplate.
Note: The following steps are common
to both head configurations
Sealing Vessels with PTFE Gaskets
If your split ring has compression bolts, tighten each
of the bolts with the wrench furnished. Apply a firm
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 five minutes after the initial tightening;
then tighten the bolts again. This will compensate
for any tendency of the PTFE gasket to flow 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
fitting into the adapter attached to the gas inlet valve
and tighten the compression nut firmly. Do not use
any thread dope on the coned fitting. The A495HC
pressure hose is made of reinforced Nylon that can
be used at ambient temperature for all non-corro-
sive gases at pressures up to 2500 psig. For opera-
tions involving corrosive gases, this hose should