Parr Instrument 4703 Instruction Manual

239M
4600 & 4700
General Purpose Pressure Vessels
Operating Instruction Manual

Table of Contents
Parr Instrument Company
2
PREFACE 3
Scope 3
Related Instructions 3
Intended Usage 3
Safety Information 3
Explanation of Symbols 4
Environmental Conditions 4
Unpack Carefully 4
Provisions for Lifting and Carrying 4
Cleaning and Maintenance 4
User’s Responsibility 5
Pressure and Temperature Limits 5
CLOSURES 6
Split Ring Closures 6
Split Ring Closure Operations 6
Screw Cap Closures 6
Operating 4700 Screw Cap Vessels 6
PARR PRESSURE VESSEL SEALS 7
Flat Gasket or Self Sealing O-ring Closure 7
Seals for Operating Temperatures up to 350 °C 7
Gaskets for Operating Temperature above 350 °C 7
Sealing the Vessel 7
Vessels with an O-ring seal 7
Vessels with a Flat PTFE or Flexible Graphite Gasket 8
Vessels with a Metal Gasket 8
Sealing 4740 High Pressure Vessels 8
OTHER VESSEL HEAD FITTINGS 9
Gage Block Assemblies 9
Pressure Gages 9
Safety Rupture Discs 9
Coned Pressure Fittings 9
Tapered Pipe Threads 10
MAINTENANCE 10
General Maintenance Notes 10
Periodic Pressure Tests 11
HEAD ASSEMBLY GUIDE 12
MATERIAL DESIGNATIONS 12
Material Designations for Alloys other than T316SS 12
Gasket Material Designations 12
SERIES 4700 WORKING LIMITS AND PARTS LISTS 13
Series 4703-4714 13
Series 4740 14
Series 4750 15
Series 4760-4777 16
Series 4760Q-4777Q 18
Series 4790 20
SERIES 4600 WORKING LIMITS AND PARTS LISTS 22
Series 4600-4620 22
Series 4600Q-4620Q 23
Series 4605-4626 24
Series 4650 25
Series 4660 26
Series 4660Q 27
Series 4670-4674 28
Series 4676-4677 29
Series 4678-4679 30
Series 4680 31
4316 & 4317 GAGE BLOCK ASSEMBLIES 32
Gage Block Parts List 32
Gage Block Assembly Drawing 34
Customer Service
Questions concerning the installation or operation
of this instrument can be answered by the Parr
Customer Service Department:
1-309-762-7716 • 1-800-872-7720
Fax: [phone]
E-mail: [email protected]
http://www.parrinst.com

General Purpose Pressure Vessels
www.parrinst.com
3
PREFACE
Scope
These instructions cover the basic operating steps to
be followed when using a variety of pressure vessels
manufactured by the Parr Instrument Company. They
include temperature and pressure ratings for Series
4600 and 4700 General Purpose Pressure Vessels, also
instructions for the gage block assemblies commonly
used with these vessels. This material is intended to
be used in conjunction with several related instruc-
tion sheets listed in the section below covering safety
precautions and other information applicable to Parr
pressure equipment. The user should study all of
these instructions carefully before starting to use any
Parr pressure vessels in order to obtain a complete
understanding of the capabilities and limitations of
these vessels, and to be well aware of the precautions
to be observed in their operation.
Related Instructions
The following Parr publications are also included to
further your understanding of this instrument and
its component parts:
No. Description
201M Limited Warranty
230M Safety Precautions to be observed when
operating Pressure Reaction Equipment
231M Operating Instructions for Parr Safety
Rupture Discs
285M Sealing Instructions for Flexible
Graphite Gaskets
323M Operating Instructions for Pressure
Relief Valves
551M Operating Instructions for 4838
Temperature Controllers
FX004 Health & Safety Assurance Certification
Intended Usage
This system has been designed for use as a high
pressure reactor system. It has been designed, built,
and tested to strict physical and electrical standards.
However, it is the user’s responsibility to install and
operate it in conformance with local pressure and
electrical codes.
If this equipment is used in a manner beyond its
intended usage, the protection provided by the
equipment may be impaired.
Safety Information
To avoid electrical shock, always:
1. Use a properly grounded electrical outlet of
correct voltage and current handling capability.
2. Ensure that the equipment is connected to
electrical service according to local national
electrical codes. Failure to properly connect may
create a fire or shock hazard.
3. For continued protection against possible
hazard, replace fuses with same type and rating
of fuse.
4. Disconnect from the power supply before
maintenance or servicing.
To avoid personal injury:
1. Do not use in the presence of flammable or
combustible materials; fire or explosion may
result.This device contains components which
may ignite such material.
2. Refer servicing to qualified personnel.
Product Registration & Customer Satisfaction
Parr’s Product Registration and Customer Satisfaction
Survey can be found by visiting our website at:
www.parrinst.com/support/product-registration
Register your equipment with us so you can receive:
• Notification of Product Updates
• Free Software Upgrades
• New Product Information
Please complete our Customer Satisfaction Survey so that
we may better serve you. Your feedback helps us improve
our products and customer service.

General Purpose Pressure Vessels
Parr Instrument Company
4
Explanation of Symbols
II On position, full power heater switch
I On position, half power heater switch
O Off Position
~ Alternating Current (AC)
This CAUTION symbol may be present on the Product Instrumentation and
literature. If present on the product, the user must consult the appropriate
part of the accompanying product literature for more information.
This CAUTION symbol indicates that the surface may be hot.
Protective Earth (PE) terminal. Provided for connection of the Protective
Earth (green or green/yellow) supply system conductor.
Environmental Conditions
This instrument is intended to be used indoors.
Caution!
Do not use in hazardous atmospheres.
Operating: 15 ºC to 40 ºC; maximum relative humid-
ity of 80% non-condensing. Installation Category II
(over voltage) in accordance with IEC 664. Pollution
degree 2 in accordance with IEC 664.
Altitude Limit: 2000 meters.
Storage: -25 °C to 65 °C; 10% to 85% relative humidity.
Unpack Carefully
Unpack the equipment carefully and check all the
parts against the packing list. If shipping damage
is discovered, report it immediately to the deliver-
ing carriers.The vessel, motor, heater, and tem-
perature controller may be packed separately for
convenience in shipping, but these parts are easily
reassembled. Examine the components closely for
any loose parts or shipping damage and be sure to
check all layers of packing materials thoroughly so
as not to overlook any parts which might otherwise
be discarded.
Provisions for Lifting and Carrying
The Series 4600 and 4700 General Purpose Vessels
and their components are very heavy. Before
moving ensure all cables are disconnected. Use
proper and safe lifting techniques when installing or
moving the Series 4600 and 4700 General Purpose
Vessels and/ or its components.
Cleaning and Maintenance
Periodic cleaning may be performed on the exterior
surfaces of the instrument with a lightly dampened
cloth containing mild soap solution. All power should
be disconnected when cleaning the instrument.
There are no user serviceable parts inside the prod-
uct other than what is specifically called out and
discussed in this manual. Advanced troubleshooting
instructions beyond the scope of this manual can
be obtained by calling Parr Instrument Company in
order to determine which part(s) may be replaced or
serviced.
Ensure that any hot surfaces have had adequate
time to cool before cleaning or maintaining the
reactor and/or its components.

General Purpose Pressure Vessels
www.parrinst.com
5
User’s Responsibility
All Parr Reactors and pressure vessels are designed
and manufactured with great care to assure safe
operation when used within their prescribed tem-
perature and pressure limits. But . . . the basic
responsibility for safety when using this equipment
rests entirely with the user; who must:
1. Select a reactor or pressure vessel which has the
capability, pressure rating, corrosion resistance
and design features that are suitable for its in-
tended use. Parr engineers will be glad to dis-
cuss available equipment and material options
with prospective users, but the final responsi-
bility for selecting a reactor or pressure vessel
that will perform to the user’s satisfaction in any
particular reaction or test must rest with the user
– not with Parr.
In exercising the responsibility for the selection
of pressure equipment, the prospective user
is often faced with a choice between over- or
under-designed equipment.The hazards intro-
duced by under-designed pressure vessels are
readily apparent, but the penalties that must
be paid for over-designed apparatus are often
overlooked.
Recognizing these criteria, Parr reactors and
pressure vessels are offered in several different
styles, each designed for convenient use in daily
operation within certain temperature and pres-
sure limits, using gaskets, closures and other
elements carefully selected for safe operation
within the limits specified for that design. But in
order to preserve the validity of these designs,
all temperature and pressure limits must be
observed, and no attempt should be made to
increase these limits by making alterations or by
substituting components which are not recom-
mended by Parr Instrument Company.
2. Install and operate the equipment within a
suitable barricade, if required, with appropriate
safety accessories and in full compliance with
local safety codes and rules.
All standard Parr pressure vessels are provided
with either a suitable relief device or a means
to attach one (typically in the form of a plugged
opening). When a pressure vessel is delivered
without a pressure venting device, it is the cus-
tomer’s responsibility to provide pressure relief
in order to protect the operator and the equip-
ment from destructive high pressures. If you
need more information or need help in selecting
a proper relief device, please contact Parr Instru-
ment Company.
3. Establish training procedures to ensure that any
person handling the equipment knows how to
use it properly.
4. Maintain the equipment in good condition and
establish procedures for periodic testing to be
sure the vessel remains structurally sound.
Pressure and Temperature Limits
The working pressure and temperature at which any
reactor or pressure vessel can be used will depend
upon the design of the vessel and the materials
used in its construction. Since all materials lose
strength at elevated temperatures, any pressure
rating must be stated in terms of the temperature at
which it applies. The standard material of construc-
tion for Parr Instrument Company isType 316 Stain-
less Steel.
Limits for vessels made of other materials and for
other operating temperatures can be obtained from
Parr Customer Service. No attempt should be made
to increase these limits by making alterations or by
substituting components that are not recommended
by the Parr Instrument Company. It must also be
understood that lower pressure and temperature
limits may be required for modified reactors and for
vessels made of special alloys.
Limits for vessels will be determined by the physi-
cal characteristics of the vessel material and will be
prescribed on an individual basis.
The maximum working pressure and temperature
for any vessel is governed by the design of the
vessel and the strength of the material from which
it is constructed. There is also a close relationship
between working pressure and temperature since
the strength of any material will normally fall off
as the temperature is increased. Temperature and
pressure limits are also affected by the physical
properties and temperature limits of the gaskets and
seals used in the vessel, and by any valves, gages
or other fittings attached to the vessel. Obviously,
the safe operating pressure of any system can be no
higher than that of its lowest rated component.
All Parr reactors show the maximum safe operating
pressure and temperature imprinted on the cylinder.

General Purpose Pressure Vessels
Parr Instrument Company
6
CLOSURES
Split Ring Closures
Most Parr pressure ves-
sels are equipped with
a unique split ring cover
clamp in which the head
of the vessel is clamped to
the cylinder by a hardened
steel ring which has been
split into two sections.
These sections slide into
place from the sides
without interfering with
any fittings attached to the
head.
The closing force is devel-
oped by simply tightening
a set of compression bolts
in the ring sections with a
hand wrench. As a further
convenience, larger Parr
vessels in one and two
gallon sizes, and certain
high temperature and
high pressure vessels, are
equipped with split ring
closures which do not
require an outer retaining
ring or drop band. This
allows the vessel to be
opened and closed by
simply sliding the split ring section into place from
the sides and tightening the compression bolts
while the cylinder remains in place in its heater or
other fixed support.
Split Ring Closure Operations
All vessels with split ring closures, except the larger
Series 4660, 4670 and 4680 sizes, must be removed
from the heater and set on a bench or table top
before attempting to remove the split rings and
head.
1. To Open the Vessel: open the gas release valve
to discharge any internal pressure; then loosen
the compression bolts in the split ring sections.
Loosen the cone pointed screw in the outer band
and lower the band to rest on the table. The ring
sections can now be removed, and the head with
all attached fittings is free to be lifted from the
cylinder.
4751 125 mL Vessel with
Split Ring Closure and
4316 Gage Block Assembly
2. 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 hard-
ened, discolored, or deformed. Examine the
mating surfaces on the cylinder and head to be
sure they are clean and free from burrs; then set
the head on the cylinder.
3. To Close the Vessel: put the two split ring halves
around the head and cylinder flanges, fasten the
latches or tighten the bolts as assembled before.
4. Routinely inspect the bolts on split ring clo-
sures for lubrication and cleanliness. These
screws should not be allowed to dry because
the threads will seize. Regularly apply Parr High
Temperature Anti-Seize Lubricant before this
happens.
Screw Cap Closures
On the smallest Parr vessels a
threaded sleeve and screw cap
are used to clamp the head to a
cylinder. This is a union type cou-
pling in which proper alignment
between the head and cylinder
is always assured since neither
of these parts rotates when the
screw cap is tightened. The flat
gasket is held in a recess in the
head. The seal is made as the
lip of the cylinder is compressed
against the gasket through tight-
ening the screw cap and sleeve.
All components must be kept
clean. The gasket must be re-
placed whenever it becomes worn
or damaged. Any nicks in gasket
recess area or to the sealing face
of the cylinder must be avoided.
Operating 4700 Screw Cap Vessels
To close the Series 4700 Screw Cap Vessels: raise
the sleeve against the top rim of the cylinder; set
the head on the cylinder and attach the screw cap.
Turn the screw cap down until it is finger tight; then
set the vessel in a Parr A22AC3 bench socket and
tighten the cap firmly with a 21AC4 box wrench.
4703 22 mL Screw
Cap Vessel

General Purpose Pressure Vessels
www.parrinst.com
7
PARR PRESSURE VESSEL SEALS
Several different head sealing arrangements are
used in Parr Pressure Vessels, each selected for easy
access to the interior of the vessel as well as for
safe operation within the pressure and temperature
limits for which the vessel is designed. Both flat
compression type gaskets and O-rings are used in
these designs.
The various gasket materials used in Parr pressure
vessels are listed inTable I. Since several of these
materials are produced by different suppliers under
different trade names, the ASTM generic designa-
tion is used in these instructions to identify the type
of sealing material (or materials) recommended for
each Parr vessel.
Flat Gasket or Self Sealing O-ring Closure
The flat gasket is held in a recess in the vessel head
and a machine pilot on the cylinder closes the recess
to completely contain the gasket. The split ring clo-
sure used with this gasket has cap screws which must
be tightened to develop the loading on the gasket.
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 used with this sealing
system does not require nor have the cap screws
used with the flat gasket.
The flat PTFE gasket can be used to operating tem-
peratures as high as 350 °C.The flat flexible graphite
(FG) gasket can be used to operating temperatures
as high as 600 °C.
The maximum temperature of the vessels equipped
with O-ring seals depends upon the material used
for the O-ring. The most common material is a fluo-
roelastomer (FKM) which has a 225 °C maximum
operating temperature limit.
Seals for Operating Temperatures up to 350 °C
Parr uses both flat contained gaskets and O-rings
made of different materials, each with a different
maximum working temperature. Flat gaskets made
of PTFE fluoropolymer resins are the recommended
choice for many applications since PTFE materi-
als are inert to most chemicals. PTFE gaskets will
provide good seals under repeated opening and
closing of the vessel if the gasket temperature does
not exceed 350 °C.
O-rings are available in several different materials
for use within the temperature limit listed in the
following table.
Vessel Seal Temperature Limits
Material Maximum Temperature
NBR 150 °C
FKM 225 °C
FFKM 300 °C
PTFE 350 °C
Gaskets for Operating Temperature above 350 °C
Parr uses a flexible form of graphite which has
proven to be an excellent high temperature sealing
material. It has almost unlimited temperature range,
retaining its structure at temperatures well above the
maximum at which a metal gasket can operate, and
offering broad corrosion resistance as well.
Metal Gaskets can be furnished if required for special
applications. These are usually made of stainless
steel machined to a unique diamond shape with
edges which fit into supporting grooves in the head
and cylinder of the vessel. This type of gasket re-
quires careful maintenance and a uniform loading ap-
plied by tightening a ring of compression bolts with a
torque wrench. For easier handling, Parr has replaced
its diamond shaped metal gaskets with flat, flexible
graphite gaskets (FG) described above. But it will
continue to furnish metal gaskets in custom vessels
for applications in which a metal gasket appears to
offer the best solution to a difficult sealing problem.
Sealing the Vessel
Vessels with split ring closures are sealed by tight-
ening the compression bolts in the split ring sec-
tions with a wrench furnished with the apparatus. To
ensure uniform loading, turn down each bolt finger
tight, then tighten to the limit described below for
the type of gasket being used. Do not over-tighten
the compression bolts as this can generate exces-
sive strain on the closure.
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.

General Purpose Pressure Vessels
Parr Instrument Company
8
Vessels with a Flat PTFE or 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. Unless otherwise note on
documentation accompanying the product, recom-
mended torque values are shown alongside respec-
tive model numbers in subsequent pages on this
operating instruction manual.
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 level 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.
For vessels with PTFE Flat Gasket, after recom-
mended torque value is reached, let the vessel
stand for about five minutes then re-tighten again to
recommended torque value.This will compensate
for any tendency of the PTFE gasket to flow under
the loading.
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.
Sealing 4740 High Pressure Vessels
Closing operations for the 1.0 inch I.D., Series 4740
high pressure vessels are similar to those described
for larger vessels with flexible graphite gaskets,
except on the 4740 Series the compression screws
are carried in a screw cap instead of in a split ring.
When closing a 4740, clamp the cylinder in a vise;
check the graphite gasket to be sure that it fits
properly in the head groove; set the head on the
cylinder and add the compression ring. Check the
screw cap to be sure that the six screws have been
turned back so that they do not project through the
cap, and then screw the cap onto the cylinder. Turn
it down as far as it will go, then back it off about 1/8
turn. Now, tighten the screws with a torque wrench
with an initial 10 ft-lbs using the criss-cross pattern
described for larger vessels. After all have been
tightened to 10 ft-lbs, repeat the procedure, increas-
ing the torque until all have been tightened to the
recommended 15 ft-lb limit.

General Purpose Pressure Vessels
www.parrinst.com
9
OTHER VESSEL HEAD FITTINGS
Gage Block Assemblies
Parr gage block assemblies combine the function of
an inlet valve, a pressure gage and a safety rupture
disc in a compact assembly on a block which can
be attached to the head of a pressure vessel with a
single connecting tube. There is a threaded socket
in the block for a gas connection with a pressure
hose or tubing using aType A coned pressure fitting.
Coned pressure fittings are also used on the tube
which connects the block to the pressure vessel.
The valve in this assembly controls the flow of gas
into the vessel and the gage shows the internal
pressure when the valve is closed. Two styles are
offered: The 4316 gage block assembly has a 3-1/2”
dia. pressure gage and aType A socket connector.
This unit is normally used on smaller vessels where
space is limited.
The 4317 gage block assembly has a 4-1/2” dia. gage
and aType B connector. It is typically furnished on
vessels one liter and larger.
Pressure Gages
Pressure gages display in both psi and bar in vari-
ous ranges for use on Parr gage block assemblies.
The available ranges are shown in the gage block
parts list. All of these gages have stainless steel
cases withT316SS Bourdon tubes and ¼” NPT male
connections. Gages constructed of Alloy 400 are
available on special order.
Safety Rupture Discs
Detailed instructions for the safety rupture disc
installed in Parr gage blocks and heads are provided
in a separate Instruction Sheet No. 231M. The user
should review these instructions carefully. Please
note that the operating pressures in the vessel
should not exceed 90% of the range of the pressure
gage and rupture disc. Also note the warning that
the discharge port from the rupture disc must always
be directed away from all operating personnel. A
compression fitting for use with 3/8” O.D. tubing is
attached to the rupture disc body. It is recommend-
ed that tubing be attached to this connector to carry
any discharge to a fume hood or safe area in the
event of an over-pressure. The free or discharge end
of any attached tubing must be anchored securely.
Coned Pressure Fittings
The coned pressure fittings used to connect gage
blocks, pressure hoses and other detachable parts
to Parr pressure vessels are illustrated below. These
fittings have a sleeve with a left-handed thread
which screws onto the end of a thick-walled tube
plus a compression nut to complete the assembly.
When screwed into a matching socket, these parts
form a rigid joint which will remain tight over a wide
temperature and pressure range, yet the joint can be
made and broken repeatedly without destroying the
sealing faces. No gasket is required.
4316 Gage
Block
Assembly
4317 Gage
Block
Assembly

General Purpose Pressure Vessels
Parr Instrument Company
10
TUBING
NUT
BUSHING
D
E
Coned Pressure Fittings
Type A B
Tube Size 1/4” 3/8”
Thread (D) 9/16-18 3/4-16
Bore (E) 3/32” 1/8”
Nut No. 35HC 326HC
Bushing No.
40HC 366HC
When using these coned connectors, screw the
bushing onto the tube as far as it will go; then insert
the end of the tube into the head or gage block and
tighten the compression nut firmly while holding the
block stationary with the gage facing in the desired
direction. Note that this assembly behaves like a
pipe union, allowing the connecting tube or hose to
remain stationary while the joint is tightened.
Note: PTFE tape is not required on these connectors.
Tapered Pipe Threads
The pressure gage, needle valves and other fixed
attachments on Parr vessel heads have tapered pipe
threads which are not to be disturbed after they
have been screwed into place. If it becomes neces-
sary to remove any of these fittings, the pipe threads
must be coated with PTFE tape, flexible graphite
tape, or similar luting material on reassembly.
The ID of a pipe or pipe fitting can be enlarged to
accommodate a tubing feed-thru. Note that, in some
cases, this may cause a reduction of the pressure
rating.The port below a female pipe connection can
also be opened up to a larger size.
The maximum openings are shown in the table below.
A
B
C
Tapered Pipe Threads
Nominal Size 1/8” 1/4”
Pipe OD (A) 0.405” 0.540”
Maximum
Feed-thru (B) 1/4” 3/8”
Maximum Exit
Port (C) 0.339” 0.438”
MAINTENANCE
General Maintenance Notes
1. Periodically inspect all electrical wiring and pres-
sure connections for excessive corrosion. Sus-
pect parts should be replaced by components
only supplied by Parr Instrument Company.
2. Always use appropriate wrenches on all fittings
and valves. Never use pliers or pipe wrenches.
3. Head and cylinder service fixtures are available
for convenience and protection of components
during maintenance of your reactor.
Note: For more information about available
service fixtures, referenceTechNote 307.
4. A light coating of thread lubricant, such as Parr
HighTemperature Anti-Seize Lubricant, (424HC2)
should be applied to the straight threads of
coned pressure connections as well as to the
nose of the mating piece this will help to obtain
a tight joint.
Note: PTFE tape should be used only on
all tapered (NPT) threads not NPS straight
threads.
5. NPT (National PipeTaper) threads should not be
disassembled any more than necessary. It will
become increasingly difficult to maintain a tight
seal with these tapered threads if the joint is
made and broken repeatedly.
6. Do not use oil or anti-seize lubricant on threads
or fittings if the vessel is to be used with oxygen.
7. If your vessel is equipped with a loose compres-
sion ring be sure that it is in place on the head
before attaching any head fittings. The compres-
sion ring cannot be installed after fittings have
been screwed into the head.
8. Clean all threads and gas passages thoroughly
and remove all tape fragments when overhaul-
ing a vessel. An ultrasonic bath is excellent for
cleaning metal parts, but do not place a thermo-
couple probe, pressure gage, face seals or ball
bearings in an ultrasonic bath. Periodic cleaning
may be performed on the exterior surfaces of
the reactor stand with a damp cloth. All power
should be disconnected when cleaning.

General Purpose Pressure Vessels
www.parrinst.com
11
9. Routinely inspect the bolts on split ring clo-
sures for lubrication and cleanliness. These
screws should not be allowed to dry because
the threads will seize. Regularly apply Parr High
Temperature Anti-Seize Lubricant before this
happens. It is important to keep the bolts lubri-
cated so they will not seize and also to achieve
the intended torque value.
10. Routinely inspect screw cap threads for wear
and cleanliness.
11. If servicing assistance is needed, contact Parr In-
strument Company direct at the address shown
on the back of these instructions.
Periodic Pressure Tests
Each cylinder used in a Parr pressure vessel is tested
under hydrostatic pressure to the higher of 1.43
times the rated working pressure at room tem-
perature or 1.30 times the rated working pressure
corrected for temperature before it is released from
the factory. Micrometer caliper measurements are
taken during this test to check the deflection of the
walls under pressure. Excessive deflection or failure
of the metal to resume its original dimensions after
pressure is released indicates that a cylinder is po-
tentially unsafe and it will be rejected. Similar tests
should be made at regular intervals during the life
of each cylinder, and particularly whenever the user
suspects that the equipment has been over-stressed
or damaged.
Some laboratories maintain hydraulic test facilities
and make it a rule that all pressure vessels must
be tested at regular intervals. Records are kept of
deflections at specific test pressures so that any
increase in deflection becomes a warning that the
metal has lost strength. Any cylinder that fails to
return to its original dimensions after application of
the prescribed hydrostatic test should be discarded
as unsafe for further use.
Users who do not have pressure test facilities can
return any Parr pressure vessel to the factory for hy-
drostatic testing and overhaul. This should be done
whenever the metal shows excessive damage from
corrosion or whenever an over-pressure or other
unusual occurrence raises any safety questions.
To return a vessel for repair, contact Parr Instrument
Company for a return authorization number (RMA).
Apparatus returned for testing and overhaul should
be shipped prepaid to the following address:
Ship repair to:
Parr Instrument Company
Attn: Service Department
RMA # XXXXXX
211 53rd Street
Moline, Illinois 61265
USA
An order or letter of instructions should be mailed to
the same address, as no repair work will be started
without specific instructions and a Health & Safety
Assurance Certification form (FX004) signed by a
responsible user.

General Purpose Pressure Vessels
Parr Instrument Company
12
HEAD ASSEMBLY GUIDE
Refer to this table for more information about Head Styles Listed in Series Working Limits and Parts List section.
Head Style Description
One opening, TBD One opening, size to be determined by user
“A” Socket OneType “A” Socket opening, to be used with 4316 Gage Block Assembly 1
“B” Socket OneType “B” Socket opening, to be used with 4317 Gage Block Assembly 1
VGR Valve, gage, rupture disc, and thermocouple 2 3
Notes:
1) Reference pages 32-35 for more information about Gage Block Assemblies.
2) Number of valves varies amongst series. See individual heads for number of valves.
3) A thermowell with thermocouple is offered for most series if needed.
MATERIAL DESIGNATIONS
Material Designations for Alloys other than T316SS
For parts made from alternate materials use the codes shown below as a suffix to the standard part number.
CM - Alloy 400 CC - Alloy 20Cb3 CH - Alloy C-276
CT - Alloy 600 CAD - Titanium G2 CXA - Zirconium G702
CG - Alloy B-2 CAA - Titanium G4 CXB - Zirconium G705
Gasket Material Designations
Common Trade Name Type of Material ASTM Designations Parr Suffix
Nitrile, buna-N Butadiene / acryloelastomer NBR JB
Viton®1Fluoroelastomer FKM JV
Kalrez®2
Chemraz®3
Parofluor®4
Perfluoroelastomer FFKM JK
Ethylene/ Propylene Ethylene propylene Copolymer elastomer EP JE
Teflon®5Tetrafluoroethylene polymer PTFE HA
Grafoil®6Flexible graphite FG KL
1) Viton® is a registered trademark of DuPont
2) Kalrez® is a registered trademark of DuPont
3) Chemraz® is a registered trademark of Green,Tweede & Co. Ltd.
4) Parofluor® is a registered trademark of Parker Hannifin Corporation
5) Teflon® is a registered trademark of DuPont
6) Grafoil® is a registered trademark of UCAR Carbon, Inc.

General Purpose Pressure Vessels
www.parrinst.com
13
Series 4703-4714
Model Size Head Style Closure
Material
4703 22 mL One opening, TBD Steel
4704 22 mL “A" Socket Steel
4713 45 mL One opening, TBD Steel
4714 45 mL “A” Socket Steel
Working Limits
Maximum Working Pressure
(T316SS) 1700 psi (117 bar)
Maximum WorkingTemperature
with Steel Closure 300 °C
Note: For special material vessels add material code for head, cylinder and/or internal fittings per page 12.
Recommended Bolt Torque:
PTFE Gasket
500 PSI 15 ft - lbs
1000 PSI 20 ft - lbs
1500 PSI 30 ft - lbs
1700 PSI 40 ft - lbs
Part No. Description Flat Gasket Seal
7AC7 Head, "A" socket
7AC8 Head, one 1/4" NPT opening
7AC27 Head, one 1/8” NPT opening
2AC Cylinder, 22 mL, 1.62" deep
2AC4 Cylinder, 45 mL, 3.81" deep
170AC Screw cap, alloy steel
6ACDB Body Sleeve, alloy steel
27ACHA Gasket, PTFE
21AC4 Wrench, 1-5/8" octagon
A22AC3 Holder Socket with screws
7AC7 HEAD, A SKT (4704/4714)
170AC SCREW CAP
27ACHA GASKET
6ACDB BODY SLEEVE
W/PLUG (4703/4713)
7AC27, HEAD, 1/8 NPT
2AC CYLINDER, 22mL
2AC4 CYLINDER, 45mL
SERIES 4700 WORKING LIMITS AND PARTS LISTS

General Purpose Pressure Vessels
Parr Instrument Company
14
Series 4740
Model Size Head Style
4740 75 mL “A” Socket
4742 25 mL “A” Socket
Working Limits*
Maximum Working Pressure (T316SS)
8500 psi (586 bar) @ 350 °C
1850 psi (127 bar) @ 538 °C
Maximum WorkingTemperature 538 °C
*See Manual No. 294M for more information.
Recommended Bolt Torque:
PTFE or Flexible Graphite
8500 PSI 15 ft - lbs
Note: For special material vessels add material code for head, cylinder and/or internal fittings per page 12.
**Required for maximum working pressure of 7900 psi (544 bar) at 538 °C for vessel of T316SS
Part No. Description Flat Gasket Seal
1827HC Head , "A" Socket opening
A1828HC Cylinder, 75 mL
A1828HC2 Cylinder, 22 mL
1829HCKL Gasket, Flexible Graphite
1826HC Compression Ring
A33HD2 Screw Cap with compression bolts,
alloy steel
33HDF2 Compression Bolt for screw cap
(6 required)
A33HD2CH ** Screw Cap with compression bolts,
Hastelloy C
40HD2HA PTFE Liner, 25 mL
40HD Pyrex Liner, 75 mL
40HDHA PTFE Liner, 75 mL
1826HC
COMPRESSION RING
GASKET, GRAFOIL
1829HCKL
1827HC HEAD
SCREW CAP
A33HD2
COMPRESSION BOLTS
(6) 33HDF2
A1828HC (4740)
CYLINDER, 75mL
A1828HC2 (4742)
CYLINDER, 25mL

General Purpose Pressure Vessels
www.parrinst.com
15
Note: For special material vessels add material code for head, cylinder and/or internal fittings per page 12.
Series 4750
Model Size Head Style
4750 125 mL One opening, TBD
4751 125 mL “A” Socket
4752 200 mL One opening, TBD
4753 200 mL “A” Socket
4754 125 mL “A” Socket & 1/8” NPT
with thermocouple
4755 200 mL “A” Socket & 1/8” NPT
with thermocouple
Working Limits
Maximum Working Pressure (T316SS)
3000 psi (207 bar)@ 350 °C
[200 bar for CE orders]
Maximum WorkingTemperature 350 °C
Recommended Bolt Torque:
PTFE or Flexible Graphite
15 ft - lbs max
Part No. Description Flat Gasket Seal
428HC3 Head, "A" socket opening
428HC9 Head, two 1/8" NPT
428HC11 Head, "A" socket & 1/8" NPT
428HC22 Head, "A" socket & 1/8" NPT
for thermowell
425HC Cylinder, 125 mL, 4.44" deep
425HC3 Cylinder, 200 mL, 6.94" deep
429HC2 Gasket, PTFE
429HC2KL Gasket, Flexible Graphite
430HC Compression Ring
A431HC Split ring, pair, with cap screws
232HCFDE Cap Screw for above (6 required)
A432HC Drop band with set screw
456HCF2 Set screw for above
A833HC Male Connector for thermocouple
A472E Thermocouple, 7-1/2”, SS
A472E2 Thermocouple, 9-1/2”, SS
A138CA Male Connector for thermowell
A1453HC Thermowell
2920HC4HA PTFE liner, 125 mL
2920HC2 Pyrex liner, 125 mL
2920HC3HA PTFE liner, 200 mL
2920HC3 Pyrex liner, 200 mL
428HC SERIES HEAD
430HC COMPRESSION RING
A431HC SPLIT RING ASSY
429HC2 GASKET
A432HC DROP BAND W/SCREW
A833HC MALE CONNECTOR
425HC CYLINDER, 125mL
425HC3 CYLINDER, 200mL
A472E THERMOCOUPLE, 125mL
A472E2 THERMOCOUPLE, 200mL

General Purpose Pressure Vessels
Parr Instrument Company
16
Note: For special material vessels add material code for head, cylinder and/or internal fittings per page 12.
Series 4760-4777
Model Size Head Style
4760 300 mL One opening, TBD
4761 300 mL “A” Socket
4762 450 mL One opening, TBD
4763 450 mL “A” Socket
4764 600 mL One opening, TBD
4765 600 mL “A” Socket
4766 300 mL VGR
4767 450 mL VGR
4768 600 mL VGR
4772 160 mL One opening, TBD
4773 160 mL “A” Socket
4774 160 mL VGR
4775 100 mL One opening, TBD
4776 100 mL “A” Socket
4777 100 mL VGR
Working Limits
Maximum Working Pressure
3000 psi (207 bar) @ 350 °C
[200 bar for CE orders]
Maximum WorkingTemperature
with PTFE confined flat gasket 350 °C
Recommended Bolt Torque:
PTFE Gasket 25 ft - lbs
Flexible Graphite 35 ft - lbs
Part No. Description Flat Gasket Seal
453HC Head, "A" Socket opening
453HC5 Head, "A" Socket & 1/8” NPT
453HC79* Head, “A” Socket & 1/8” NPT for
thermowell
818HC45 Head, VGR
452HC Cylinder, 300 mL, 3.94" deep
452HC2 Cylinder, 450 mL, 5.94" deep
452HC3 Cylinder, 600 mL, 7.94" deep
452HC9 Cylinder, 160 mL, 2.00" deep
452HC8 Cylinder, 100 mL, 2.00" deep, 2” ID
457HC2 Gasket, PTFE
457HC3KL Gasket, Flexible Graphite
454HC Compression Ring
A455HC Split ring, pair, with cap screws
232HCFDE Cap screw for above (6 required)
A456HC Drop band with set screw
456HCF Set screw for above
A833HC Connector for thermocouple
A472E Thermocouple, 7-1/2”, SS
A472E2 Thermocouple, 9-1/2”, SS
A472E3 Thermocouple, 11-1/2, SS
A1453HC Thermowell
A138CA Connector for thermowell
2583HC Head/Cylinder Service Fixture
Liners
Volume Pyrex PTFE
100 mL 762HC7 762HC7HA
160 mL 762HC8 762HC8HA
300 ML 762HC 762HC4HA
450 mL 762HC2 762HC5HA
600 mL 762HC3 762HC6HA

General Purpose Pressure Vessels
www.parrinst.com
17
A122VB STRAIGHT VALVE
420HC ADAPTER
835HC ADAPTER TEE
A146VB ANGLE VALVE
A122VB STRAIGHT VALVE
526HC SERIES R/D
832HC4 DIP TUBE W/NUT
836HC GAGE ADAPTER
818HC45 HEAD
452HC CYLINDER, 300mL
288VBAD MALE CONNECTOR
366VBA_ HEX COUPLING
A455HC SPLIT RING ASSY
457HC2 GASKET
454HC COMPRESSION RING
A456HC DROP BAND W/SCREW
A472E THERMOCOUPLE
A888HC2 R/D HOLDER ASSY
593HC SERIES PRESSURE GAGE
A833HC MALE CONNECTOR

General Purpose Pressure Vessels
Parr Instrument Company
18
Note: For special material vessels add material code for head, cylinder and/or internal fittings per page 12.
Series 4760Q-4777Q
Model Size Head Style
4760Q 300 mL One opening, TBD
4761Q 300 mL “A” Socket
4762Q 450 mL One opening, TBD
4763Q 450 mL “A” Socket
4764Q 600 mL One opening, TBD
4765Q 600 mL “A” Socket
4766Q 300 mL VGR
4767Q 450 mL VGR
4768Q 600 mL VGR
4772Q 160 mL One opening, TBD
4773Q 160 mL “A” Socket
4774Q 160 mL VGR
4775Q 100 mL One opening, TBD
4776Q 100 mL “A” Socket
4777Q 100 mL VGR
Working Limits
Maximum Working Pressure (T316SS)
3000 psi (207 bar)
[200 bar for CE orders]
Maximum WorkingTemperature
with FKM O-ring
with FFKM O-ring
225 °C
300 °C
Part No. Description O-ring Seal
2321HC2 Head, “A" socket opening
2321HC3
Head, "A" socket & 1/8” NPT
2340HC11 Head, VGR
2342HC Cylinder, 300 mL, 3.94" deep
2342HC2 Cylinder, 450 mL, 5.94" deep
2342HC3 Cylinder, 600 mL, 7.94" deep
2342HC4 Cylinder, 100 mL, 2.00” deep, 2” ID
2342HC5 Cylinder, 160 mL, 2.00" deep
2341HCJV O-ring, FKM
2341HCJK O-Ring, FFKM
2195HC Split ring, pair
A456HC Drop band with set screw
456HCF Set screw for above
A833HC Connector for thermocouple
A472E Thermocouple, 7-1/2”, SS
A472E2 Thermocouple, 9-1/2”, SS
A472E3 Thermocouple, 11-1/2, SS
A1453HC Thermowell
A138CA Connector for thermowell
2587HC Head/Cylinder Service Fixture
Liners
Volume Pyrex PTFE
100 mL 762HC7 762HC7HA
160 mL 762HC8 762HC8HA
300 ML 762HC 762HC4HA
450 mL 762HC2 762HC5HA
600 mL 762HC3 762HC6HA

General Purpose Pressure Vessels
www.parrinst.com
19
A833HC MALE CONNECTOR
562HC SERIES R/D
2340HC11 HEAD
2195HC SPLIT RING ASSY
A456HC DROP BAND W/SCREW
2341HCJV O-RING
832HC4 DIP TUBE W/NUT
288VBAD MALE CONNECTOR
A472E THERMOCOUPLE
366VBA_ HEX COUPLING
A888HC2 R/D HOLDER ASSY
2342HC CYLINDER, 300mL
A122VB STRAIGHT VALVE
593HC SERIES PRESSURE GAGE
836HC GAGE ADAPTER
A122VB STRAIGHT VALVE
835HC ADAPTER TEE
A146VB ANGLE VALVE
420HC ADAPTER

General Purpose Pressure Vessels
Parr Instrument Company
20
Series 4790
Model Size Head Style
4791 25 mL VGR
4792 50 mL VGR
4793 100 mL VGR
Working Limits (Standard Ratings)
Maximum Working Pressure
(T316SS) 3000 psi (207 bar)
[200 bar for CE orders
With PTFE Flat Gasket
With FKM O-ring
With FFKM O-ring
350 °C
225 °C
300 °C
Working Limits (High Pressure/High Temp.)
Maximum Working Pressure
(T316SS) 5000 psi (345 bar)
With PTFE Flat Gasket
With Flexible Graphite Gasket*
350 °C
500 °C
*A vessel with a Fixed Head is required for effective heating to 500 °C.
4790 with Flat Gasket & Split Ring
Part No. Description
2432HC3 Head, VGR (three valves) & 1/8” NPT
(General Purpose & HP vessels)
3665HC Fixed Head, VGR (two valves) &
&
1/8” NPT
(HP/HT vessels)
2430HC Cylinder, 25 mL
2430HC18 Cylinder, 25 mL, 100 mL Profile (HP/HT)
2430HC2 Cylinder, 50 mL
2430HC19 Cylinder, 50 mL, 100 mL Profile (HP/HT)
2430HC3 Cylinder, 100 mL
429HC2 Gasket, PTFE
429HC2KL Gasket, Flexible Graphite
454HC Compression Ring
A455HC Split Ring
A456HC Drop Band
232HCFDE Bolt for Split Ring
1443HC2 DIP TUBE, 50mL
1443HC DIP TUBE, 25mL
593HC SERIES PRESSURE GAGE
836HC GAGE ADAPTER
1432HC SERIES HEAD
A888HC2 R/D HOLDER ASSY
1430HC3 CYLINDER, 100mL
1443HC3 DIP TUBE, 100mL
526HC SERIES R/D
366VBA_ MALE CONNECTOR
288VBAD MALE CONNECTOR
1433HC SERIES O-RING
1430HC CYLINDER, 25mL
1430HC2 CYLINDER, 50mL
1379HC SCREW CAP
4790 with O-ring Seal and Screw Cap
Part No. Description
1432HC Head, VGR (three valves) & 1/8” NPT
1430HC Cylinder, 25 mL, 2" deep
1430HC2 Cylinder, 50 mL, 2.25" deep
1430HC3 Cylinder, 100 mL, 4.5" deep
1433HCJE O-Ring Gasket, EP
1433HCJK O-Ring Gasket, FFKM
1433HCJV O-Ring Gasket, FKM
1379HC Screw Cap
4790 with O-ring Seal & Easy Close Split Ring
Part No. Description
2902HC3 Head, VGR (three valves) & 1/8” NPT
2520HC Cylinder, 25 mL
2520HC2 Cylinder, 50 mL
2520HC3 Cylinder, 100 mL
2521HCJV O-Ring, FKM
2521HCJK O-Ring, FFKM
2195HC Split Ring
A456HC Drop Band
195VBAD Tee, 1/8” NPT
836HC Gage Adapter
420HC Adapter, A socket x 1/8” NPT
4790Q General Purpose Vessel
O-ring Seal and Screw Cap