Parr-instrument 4700 Manual de usuario descargar pdf (Pagina 8)

General Purpose Pressure Vessels

Parr Instrument Company

Vessels with an O-ring seal

The self-sealing design features an O-ring retained

in a groove on the vessel head. This design is self

sealing and the split ring does not require or have

the compression bolts used with the ﬂat gasket.

Vessels with a Flexible Graphite Gasket

The closure bolts may be tightened using either an

open-end wrench for smaller vessels where the bolt

torque requirement is less or with a torque wrench

where additional loading is required for the higher

operating pressures.

Some of the gasket numbers shown in the attached

table are furnished with vessels that have different

maximum working pressures. We have shown the

maximum torque value to correlate to the maximum

working pressure of the vessel.

It is important to make sure that the bolts are

periodically lubricated with a high-temp anti-seize

compound to insure that they move freely so that

the desired torque value is obtained in the tighten-

ing procedure.

It is also important to insure that there is uniform

loading on all of the bolts. Make sure that the head

sits levelly on the cylinder. Install the split ring and

tighten all bolts ﬁnger tight.

Pick a starting position and tighten the bolt to 5 or 10

ft-lbs depending on the maximum amount of torque

to be applied. For those vessels with a maximum

torque requirement of 15 ft-lbs, a 5 ft-lb increment

is appropriate. For vessels with a maximum of 135

ft-lbs, 20 ft-lb increments may be used.

Bolt tightening should continue in a criss-cross

pattern from the initial bolt with the second bolt 180

degrees from the ﬁrst and continuing until all bolts

are tightened. Repeat this procedure increasing the

torque to the required level as shown in the table

below.

Torque Required For Sealing Vessels

with Flexible Graphite Gaskets

Vessel

Series

No.

Maximum

Working

Pressure, PSI

Graphite

Gasket

No.

Torque

Required

ft-lb

4600 1900 315HC4KL 35

4790 3000 to 5000 429HC2KL 15

4760 3000 457HC3KL 35

4650 5000 to 6000 457HC3KL 40

4660 1900 655HC3KL 35

4680 5000 1808HCKL 40

4670 3000 1812HCKL 35

4740 8500 1829HCKL 15

4676 1900 1559HC2KL 135

Note: It may be possible to extend the life of

the Flexible Graphite gasket by coating both

sealing surfaces of the head and cylinder as

well as the gasket itself with a silicone base

lubricant. Additionally, it helps to rough up

the cylinder lip with 120 grit sandpaper to

insure that the gasket remains in the head

recess and does not stick to the cylinder.

Vessels with a Metal Gasket

Pressure vessels with a metal gasket require a

uniform loading on the gasket carefully applied by

tightening a ring of compression bolts with a torque

wrench. The amount of torque to be applied will

vary with different vessels and with the intended

maximum working pressure. Speciﬁc sealing

instructions will be provided for any Parr pressure

vessels with a metal gasket furnished on special

order.

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 35 36

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Parr-instrument 4700 Manual de usuario Pagina 8

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