Ametek 7550 User manual

Model 7550
High Temperature
High Pressure Viscometer
Operating Manual
Rev J – August 2019
P/N: 7550-1050
S/N _____________
2001 N. Indianwood Ave.
Broken Arrow, Oklahoma 74012 U.S.A.
Tel: [phone] Fax: [phone]
E-mail: [e-mail]
Web: www.chandlereng.com

Copyright © 2016, by Chandler Engineering Company, LLC
P.O. Box 470710, Tulsa, Oklahoma 74147
All rights reserved. Reproduction or use of contents in any manner is prohibited without express permission from AMETEK Chandler Engineering Company,
LLC. While every precaution has been taken in the preparation of this manual, the publisher assumes no responsibility for errors or omissions. Neither is any
liability assumed for damages resulting from the use of the information contained herein.
This publication contains the following trademarks and/or registered trademarks: AMETEK, CHANDLER ENGINEERING. These trademarks or registered
trademarks and stylized logos are all owned by AMETEK, Inc. All other company, product and service names and logos are trademarks or service marks of their
respective owners.

TABLE OF CONTENTS T-1
Table of Contents
General Information ....................................................................... P-1
Purpose and Use............................................................................................................................ P-1
Description of Instrument ............................................................................................................. P-1
Features and Benefits .................................................................................................................... P-2
Specifications ................................................................................................................................ P-3
Safety Requirements ..................................................................................................................... P-5
Symbols Used on Equipment ........................................................................................................ P-6
Where to find help ........................................................................................................................ P-7
Section 1 – Installation ................................................................... 1-1
Unpacking the Instrument .............................................................................................................. 1-1
Utilities Required ........................................................................................................................... 1-1
Equipment Required ...................................................................................................................... 1-1
Setup Instructions .......................................................................................................................... 1-2
Software Setup ............................................................................................................................... 1-2
Software Installation ...................................................................................................................... 1-3
Minimum PC Requirements ....................................................................................................... 1-3
Installation Procedure ................................................................................................................. 1-3
Serial Hub USB Driver Installation Procedure ........................................................................... 1-4
Section 2 – Operating Instructions .................................................. 2-1
Front Panel Controls ...................................................................................................................... 2-1
Power .......................................................................................................................................... 2-1
Pump ........................................................................................................................................... 2-1
Vessel .......................................................................................................................................... 2-1
Heater .......................................................................................................................................... 2-2
Pressure Gauge............................................................................................................................ 2-2
Pressure Release Valve ............................................................................................................... 2-2
Temperature and Pressure Controllers ........................................................................................ 2-2
Operational Guidelines .................................................................................................................. 2-2
Sample Volume ................................................................................................................................ 2-3
Vessel Disassembly .......................................................................................................................... 2-3
Vessel Assembly .............................................................................................................................. 2-8
Preparing to Pressurize and Heat the Sample ................................................................................... 2-12
Starting a Test ................................................................................................................................ 2-12
Test Preparation ....................................................................................................................... 2-12
Automated Instrument Operation ........................................................................................... 2-14
Software Operation Notes ................................................................................................................ 2-16
Schedule Entry Tab .................................................................................................................. 2-16
Preferences ............................................................................................................................... 2-23
Rheological Models ......................................................................................................................... 2-25
Ending a Test ................................................................................................................................. 2-26
Instrument Calibration ..................................................................................................................... 2-27
Calibration Overview ............................................................................................................... 2-27

T-2 TABLE OF CONTENTS
System Linearity ....................................................................................................................... 2-28
Slope ......................................................................................................................................... 2-28
Intercept .................................................................................................................................... 2-28
Hysteresis .................................................................................................................................. 2-28
Standard Deviation .................................................................................................................. 2-29
Maximum Hysteresis................................................................................................................ 2-29
Typical Hysteresis Curve ......................................................................................................... 2-29
Calibration Procedure.............................................................................................................. 2-29
Calibration Summary ............................................................................................................... 2-30
Section 3 - Maintenance and Servicing .......................................... 3-1
Tools Required ............................................................................................................................... 3-1
Cleaning and Service Tips ............................................................................................................. 3-1
Controller Calibration and Configuration Procedure ..................................................................... 3-1
High Pressure Diaphragm Valve ................................................................................................... 3-4
Rupture Disk .................................................................................................................................. 3-5
High Pressure Transducer .............................................................................................................. 3-5
Pivot Bearing and Pivot ................................................................................................................. 3-7
Heating / Cooling Jacket ................................................................................................................ 3-7
Pressure Vessel .............................................................................................................................. 3-8
O-rings and Backup Rings .......................................................................................................... 3-8
Sample Cup .................................................................................................................................... 3-9
Thermowell ................................................................................................................................. 3-9
Magnetic Drive .............................................................................................................................. 3-9
Inner Magnetic Rotor .................................................................................................................. 3-9
Outer Magnetic Drive Rotor ..................................................................................................... 3-10
Encoder Assembly ....................................................................................................................... 3-10
Supply Containers ........................................................................................................................ 3-12
Internal Regulator Pressures ........................................................................................................ 3-13
Motor Drive Belt and Stepper Motor ........................................................................................... 3-14
Pump and High Pressure Valves .................................................................................................. 3-15
Instrument Voltage Selection....................................................................................................... 3-16
Instrument Circuit Breakers ......................................................................................................... 3-17
Instrument Solenoid Valves ......................................................................................................... 3-17
Section 4 - Troubleshooting Guide ................................................. 4-1
Rheology Equations ....................................................................................................................... 4-2
Section 5 – Replacement Parts List ................................................ 5-1
Section 6 – Drawings and Schematics ............................................ 6-1

PREFACE P-1
General Information
Figure 1 - Model 7550 HPHT Viscometer
Purpose and Use
The Model 7550 high pressure high temperature (HPHT) couette viscometer is designed for
determining the rheology of well completion fluids under varying conditions in accordance
with applicable API and ISO standards.
Description of Instrument
The shear stress created between a stationary bob and rotating rotor is measured using a
precision torsion spring and high-resolution encoder. Known sample shear rates are created
between the bob and rotor using defined bob/rotor geometry and a stepper motor sub-system
providing rotational speeds ranging from 0 – 600 rpm. Suspended solids in the sample are
circulated during a test using a helical screw on the outside diameter of the rotor.
The sample viscosity is determined as the ratio of shear stress (dyne/cm2) to shear rate (sec-1)
resulting in dyne-sec/cm2, otherwise expressed as Poise.
These measurements are made at sample conditions ranging from 0 - 30000 psi (207 MPa),
and 32°F - 500°F (0°C - 260°C). A chiller is a separate option.
The system is controlled using a program that provides data acquisition, multi-axis data
display options and automatic instrument operation and calibration features.

P-2 PREFACE
Features and Benefits
The major features of the Model 7550 HPHT Viscometer are listed below:
 Viscometer meets applicable API and ISO requirements
 Bench-top instrument
 Data acquisition and control system
 Automatic control of sample temperature and pressure using PID controllers
 High pressure (30000 psi, 207 MPa), high temperature (500°F, 260°C) sample testing
 Mixing of sample during test using helical screw on outside diameter of rotor
 Automatic control of instrument, including data collection, shear rate scheduling, power-
law model coefficients (n’ and K’), display and calibration
 Automatic 10 second and 10 minute gel strength measurements
 Sample wetted parts made from stainless steel and other corrosion resistant high strength
materials
 Stepper motor and magnetic drive used to generate shear rates, providing high accuracy
and stability
 High resolution measurement of shear stress
 Safety systems designed into the instrument and software (over-pressure, over-
temperature)
 Microsoft Excel compatible data output

PREFACE P-3
Specifications
Instrument Utilities:
 Main Power: 208-240 VAC, 50/60Hz, 10A maximum
 Instrument Air or N2: 150 psi, 1034 kPa ±10% (filtered and dry)
 Coolant: Water
Sample Environment:
 Maximum Pressure: 30000 psi, 207 MPa
 Maximum Temperature: 500˚F, 260˚C
 Minimum Temperature: 32˚F, 0˚C
Sample Rheology:
 Minimum Shear Stress: 2.0 dyne/cm2
 Maximum Shear Stress (approximate, varies with spring assembly):
 F4: 6000 dyne/cm2
 F2: 3000 dyne/cm2 (Standard)
 F1: 1500 dyne/cm2
 Shear Stress Resolution: ±0.02% of F.S. (encoder resolution 2:10000)
 Motor Speed Range: 0.001– 600 RPM
 Shear Rate Range: .0017 – 1022 sec-1, corresponding to 1 – 600 RPM (B1/R1)
 Sample Gel Strength: Peak value at 3 RPM
Couette Geometry:
 Bob Radius (Ri): 1.7245 cm (B1) – other bobs are available, contact Chandler Engineering
 Rotor Radius (R0): 1.8415 cm (R1)
 Bob Length (L): 3.805 cm (B1)
 Sample mixing via helical screw on OD of rotor with circulation ports in rotor and bob. A
rotor without the helical mixing option is available.
Pressure Vessel:
 Removable sample plug assembly with support stand
 Sample/Oil separation zone
 High pressure magnetic drive for rotor
 High strength, corrosion resistant superalloy construction
 High pressure pressure ports (F250C), knurled nuts and wrench flats
 Elastomer with metal backup seals
 Material heat traceability, hydrostatically tested to 1.5x rated pressure (45000 psi, 310 MPa)
Test Fluids:
 Well completion fluids containing hematite, barite, calcium carbonate

P-4 PREFACE
Torque Measurement System:
 External cooled torque sensor, magnetically coupled to bob shaft
Motor System:
 Stepper motor subsystem
Temperature Control:
 Programmable PID Controller
 Resistance heaters with contactor and redundant over-temperature protection
 Temperature steady-state control stability: ±2˚F, ±1˚C
 J-type thermocouple located on centerline of bob and within cast heater
Pressure Control (Pump and Valve):
 Programmable PID Controller
 Air/Liquid Pump
 Diaphragm operated high pressure valve and flow restriction
 Pressure control stability: ±500 psi at F.S.
 Pressure transducer
 High pressure rupture disk (31000 psi, 214 MPa)
 Pressurizing fluid: heat transfer fluid
Control System:
 Microsoft Windows based program providing the following:
o Temperature and Pressure control time-based profiles with data collection inhibits
during temperature and pressure stabilization periods
o Motor RPM (shear rate) time or temperature based profiles providing standard speeds
(600, 300, 200, 100, 6, 3) or other user-defined speeds
o Saved user defined test profiles
o Configurable multiple axis plots of all variables (T, P, Shear Rate, Shear Stress,
Viscosity, Dial Reading, etc.)
o Automatic calibration using Newtonian oil and multiple shear rates
o Serial interface to instrument temperature, pressure, motor controllers
o Data export in CSV format, compatible with Microsoft Excel
o Configurable alarms for maximum shear stress, temperature, pressure
o Pause, Resume, Jump feature for profile steps
o Schedule “wizard” to simplify new schedule creation
Environmental Conditions:
 Pollution degree 2
 Altitude 2000 m
 Humidity 50 to 80%
 Indoor use only
 Temperature 5°C to 40°C (41°F to 104°F)
 The mains supply voltage fluctuations are not to exceed ±10% of the nominal supply voltage

PREFACE P-5
Safety Requirements
READ BEFORE ATTEMPTING OPERATION OF THE INSTRUMENT
The Chandler Engineering Model 7550 HPHT Viscometer is designed with
operator safety in mind. Any instrument that is capable of high temperatures and
pressures should always be operated with CAUTION.
NOTE: If this is equipment is not used in a manner consistent with
manufacturer’s specifications, the protection provided by the equipment
may be impaired.
WARNING: Read before attempting operation of instrument. This instrument is
capable of extremely high temperatures and pressures and must always
be operated with CAUTION. The instrument is designed for operator
safety. To ensure that safety it is essential to follow the instructions
outlined below.
WARNING: During a test, the top panel around the test cell can become hot and
cause injury.
WARNING: Remove oil from surfaces prior to conducting tests at high temperatures
to avoid the possibility of creating fumes. The instrument should be
mounted under a vent hood, or equivalent ventilation, if sample
temperatures will be above 400°F, 204°C for extended time periods.
WARNING: The instrument is calibrated with known viscosity silicone oils, do not
expose these oils to temperature above ambient to avoid thermal
decomposition of the silicone oil that may form dangerous fumes.
NOTE: The instrument must be mounted under a vent hood, or equivalent ventilation, if
sample temperatures will be above 400°F, 204°C for extended time periods.
To further ensure safety:
 Provide adequate training of all personnel that will operate the instrument.
 Locate the instrument in a low traffic, well-ventilated area.
 This is a bench top device; place the instrument on a suitable level and stable surface.
Allow a minimum of 5-inches (127mm) unobstructed clearance around the instrument
to provide adequate ventilation.
 Post signs where the instrument is being operated to warn non-operating personnel
that high pressure, high temperature equipment is in use.
 Read and understand instructions before attempting instrument operation.
 Observe caution notes.
 Observe and follow the warning labels on the instrument.
 Never exceed the instrument maximum temperature and pressure ratings.
 Always disconnect main power to the instrument before attempting any service or
repair.
 Turn OFF the heater at completion of each test.
 Remove oil on heated surfaces that may pose a hazard prior to starting a test that will
exceed 400°F, 204°C.
 Although the pressure vessel was designed using suitable materials and techniques,
due to the extreme pressure rating, it is imperative to monitor the condition of the

P-6 PREFACE
vessel and related components with a focus on safety. Any damage to the vessel or
related high pressure components must be brought to the attention of Chandler
Engineering.
 Note that AMETEK Chandler Engineering recommends periodic re-inspection and
testing of the pressure vessel assembly to maintain the rated temperature and pressure
ratings. Without re-inspection and testing, the pressure rating of the vessel assembly
must be de-rated as a function of age, usage and condition in accordance with
established vessel de-rating schedules at Chandler Engineering. Chandler
Engineering supports the design and offers periodic vessel testing services and
component replacement if/when required.
 A fire extinguisher, type 8 BC, should be located within 50 feet (15
meters) of the instrument.
 Have the safety officer at your location or laboratory review the safety aspects of the
instrument and installation and approve the operational and installation procedures.
Before attempting to operate the instrument, the operator must read and
understand this manual.
Symbols Used on Equipment
Symbol
Meaning
Protective Conductor
Terminal
Caution, risk of electric
shock. Equipment may be
powered by multiple
sources. Disconnect
(Lock-out) all services
bef
ore servicing.
Caution, hot surface. Do
NOT touch. Allow to cool
before servicing.
On (Power)
Off (Power)

PREFACE P-7
Where to find help
In the event of problems, the local sales representatives will be able to help or the
personnel at Chandler Engineering can be contacted.
 Telephone: [phone]
 FAX: [phone]
 E-mail: [e-mail]
 Website: www.chandlereng.com

P-8 PREFACE
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SECTION 1 – INSTALLATION 1-1
Section 1 – Installation
Unpacking the Instrument
Remove the instrument from the packing crate carefully. The unit comes fully equipped with
all the necessary components and any spare parts that were ordered with the unit. Make sure
that no parts or tools are lost when discarding the packing materials. Place the instrument on
a firm table, close to the coolant and air sources and required electrical outlet.
After the instrument is removed from the shipping crate, the equipment and spare parts
should be checked against the packing list to ensure that all parts have been received and
none are damaged.
NOTE: File an insurance claim with your freight carrier if damage has occurred
during shipping. Verify all parts shown on the enclosed packing list have
been received. If items are missing, immediately notify Chandler
Engineering.
Utilities Required
 Main Power to Instrument: 208-240 VAC, 50/60 Hz, 10A maximum.
 A suitable uninterruptible power supply is recommended to prevent data loss during a
power failure.
 Coolant: Clean water
 Optional Chiller subsystem
 Drain: Suitable for steam
 Air or Nitrogen: Filtered, dry; 75-150 psi, 517-1034 kPa.
NOTE: To achieve 30000 psi, 207 MPa using the internal pump, a supply of at
least 130 psi, 900 kPa Air or Nitrogen is required.
Equipment Required
 Set of English open-end wrenches
 Set of English size hex wrenches (supplied with instrument)
 Solvent based parts cleaning equipment
 Mounted bench vise

1- 2 SECTION 1 - INSTALLATION
Setup Instructions
READ BEFORE ATTEMPTING OPERATION OF INSTRUMENT
1. Locate the instrument near power, air, water, and drain connections.
2. Level the instrument by adjusting the legs under the instrument. A bubble level is
provided on the top panel of the instrument. Place the bubble on the top of the vessel
when leveling the instrument. This approach ensures that the bob shaft is vertical.
3. This instrument requires 208-240VAC.
Warning:
Verify that the proper input voltage is applied
before connecting power (220 VAC).
Damage can occur if the wrong line voltage is applied, verify
that the proper input voltage is applied. To prevent shock
hazard, connect the instrument to an electrical outlet using a
three-prong socket to provide positive ground.
4. Connect power to the instrument using the power cord supplied with the instrument. All
power and grounding must be consistent with local wiring codes.
5. The power plug may need to be changed if the local receptacle is incompatible with the
plug supplied with the instrument.
6. Connect the Air (or N2), Coolant, and Vent connections to the instrument. The coolant
outlet connection must be rated for high temperature steam.
7. The Vent port is connected to the rupture disk discharge. If the rupture disk fails,
potentially hot fluid will discharge from this port. Route the discharge from this port to a
safe location.
8. An additional Exhaust port is used to discharge low pressure air during valve switching.
Discharge from this port may include oil mist. Route the discharge from this port to a
safe location.
Software Setup
1. Leave computer off until instructed to turn it on. This will ensure proper installation of
drivers later in the process.
2. Install the USB serial port hub by connecting the USB cable from the hub to the PC, and
connecting the two (2) supplied Serial Communication Cables from the hub to the
Viscometer:
 Connect USB hub serial port S1 or Port 1to DATA serial port (the top serial
connection provides serial communication to the System I/O and temperature
controller.)
 Connect USB hub serial port S2 or Port 2 to MOTOR serial port (the bottom serial
connection provides serial communication to the motor controller.)
3. Connect the power cable.

SECTION 1 – INSTALLATION 1-3
Software Installation
The Model 7550 viscometer is operated remotely via PC serial interface, using the
Rheo7500 software.
If the Model 7550 viscometer is ordered with a computer, the software will be
pre-installed on the computer, and it is only necessary to click the Rheo7500 icon
on the desktop to start the software.
Alternatively, the software can be installed on a user’s computer following the
procedure.
Minimum PC Requirements
 Microsoft Windows XP or Windows 7 Operating System
 1 GB RAM
 2 RS232 Ports (via USB HUB or direct connection)
 1024 X 768 Display Resolution or higher
 CD-ROM/DVD Drive (for software installation, data backup)
Installation Procedure
1. Turn on the computer.
2. Insert the Rheo7500 CD into the CD drive of the computer. Run the Setup.exe file from
the root folder on the CD (double-click it).
3. The “Preparing to Install” window will appear. Read the information and Click “Next”
to continue.
4. The “Install Shield Wizard” window will appear. Read the information and Click “Next”
to continue.
5. The “License Agreement” window will appear. Read the information, click “I accept” if
you accept the terms of the agreement, and wish to continue installation. Click “Next” to
continue.
6. The “Customer Information” window will appear. Fill in your Username and Company
Name. Click “Next” to continue.
7. The “Ready to Install” window will appear. Verify the information and Click “Install” to
continue or “Back” to make a change.
8. The “Installing Rheo7500” window will appear showing installation progress.
9. When installation is complete, the screen below will appear. Click “Finish” to exit the
installer.
10. Proceed to the Driver installation procedure.

1- 4 SECTION 1 - INSTALLATION
Serial Hub USB Driver Installation Procedure
1. Install the driver for the Rocketport or Edgeport serial hub on the CD
2. Follow the on-screen instructions to install the device driver.
3. Right-Click on “My Computer” and select “Properties.”
4. Select the “Hardware” tab and “Device Manager” to determine the COM port
assignments. They will be needed during software configuration.
5. Click on the Rheo7500 icon to start the software.
6. From the manager screen, click “File” then “Open Instrument” and select the instrument
(usually SNxxx.ini) - "xxx" = instrument serial number
7. In the instrument window, select the “Setup” tab.
8. Select “Communication Settings,” “7550 Serial Ports,” “I/O, Pressure & Temperature
Control”. Assign the COM port that is used with the pressure and temperature control
9. Select “Communication Settings,” “7550 Serial Ports,” “B Motor Controller”. Assign the
COM port that is used with the motor control.
10. Verify that values on the temperature and pressure controllers are indicated on the main
screen user interface.
11. Verify that the motor may be controlled in manual mode.
12. The instrument is now ready to calibrate.
The instrument is tested and calibrated at the factory before
shipment, but it is recommended that it be re-calibrated before its
first use.

SECTION 2 – OPERATING INSTRUCTIONS 2-1
Section 2 – Operating Instructions
Front Panel Controls
Figure 2 - Front Panel Controls
Power
Controls the main power to the instrument.
Pump
ON: Provides manual control of the internal pump
OFF: Disables the internal pump
AUTO: Controller provides pressure control of the pump
Vessel
FILL: Fills the pressure vessel with pressurizing fluid from the right-front supply
bottle
OFF: Vents the low pressure air or nitrogen to the supply vessel
DRAIN: Drains the pressurizing fluid from the pressure vessel once the pressure release
valve is open.

2-2 SECTION 2 – OPERATING INSTRUCTIONS
Heater
ON: Enables the heater
OFF: Disables the heater
Pressure Gauge
The instrument is equipped with a 30000 psi, 207 MPa pressure gauge in addition to the
internal pressure transducer.
Pressure Release Valve
The pressure release valve must be closed for pressure to build inside the vessel. When
opened, pressure is released from the vessel and the fluid drains to the rear bottle located
at the right-rear of the instrument.
Temperature and Pressure Controllers
The instrument is equipped with two controllers that are interfaced to the computer based
software. Each controller may be enabled / disabled by pressing the EZ1 button.
Operational Guidelines
 Thoroughly clean vessel components and threads after each test.
 Replace top cap and plug o-rings at the first sign of wear. These o-rings must be
discarded after each test that exceeds 450°F. Use the FFKM o-rings when the sample
temperature will exceed 450°F. Below this temperature the FKM o-rings may be
used.
 Routinely inspect the pivot bearing and pivot, replacing if the instrument sensitivity
has diminished.
 Routinely inspect the bushing that is located below the rotor, replacing as needed.
 Routinely inspect the o-rings (2) that are used on the sample cup baffle, replacing as
necessary. Note that neglecting these o-rings will result in contamination of the
sample, pressurizing oil and incorrect results.
 Assemble the plug assembly without sample. Verify that bob and spring assemblies
move freely, and the top pivot is supported by the top clip. Verify that the top pivot
does not extend beyond the top clip.
 Mount the plug assembly in the vessel.
 Mount the top seal ring and o-ring (FFKM or FKM) and screw the top cap into place.
 Attach the high-pressure interconnection tube.
 Mount the encoder and attach cable and cooling air tube.
 Zero the encoder electronics.
 Open the pressure release valve.
 Operate the motor at 50 rpm, use the syringe adapter and luer-tip syringe to slowly fill
the sample cup with 110 mL of sample.
 In cases where the sample viscosity is excessive, zero the encoder, remove the plug
assembly and fill the sample cup with 80 mL of sample. Replace the plug assembly
and encoder, noting that the encoder reading may indicate a positive deflection due to
the gel strength of the sample.

SECTION 2 – OPERATING INSTRUCTIONS 2-3
 Use the syringe adapter and luer-tip syringe to slowly fill the sample cup with 30 mL
of sample.
 Remove the syringe adapter and install the high-pressure plug.
Sample Volume
The sample is pressurized with an inert mineral oil. To eliminate frictional effects, seals
are not used to separate the sample from the mineral oil. The oil/sample interface exists
within the plug above the sample volume. During use, provided the interface remains
within the plug, mixing of the oil and sample does not occur.
During a test over a range of temperatures and pressures it is important to be aware of
sample PVT characteristics. In other words, the sample volume varies with pressure and
temperature.
The volume of the sample cup below the plug is 100 mL. The 7500 Viscometer is
designed with adequate volume in the plug needed for changes in sample volume during
a test.
At no time during a test can the mineral oil exceed the 100 mL sample volume since this
will cause incorrect measurement results.
A sample fill volume of 105 - 110 mL is satisfactory in most cases. Other cases
involving sample volumes that change more than 10% as a function of temperature and
pressure (increasing or decreasing) during a test may require adjustment of the starting
sample volume.
The sample volume up to the level of the front fill port may be determined using the
syringe adapter and syringe. With the plug assembly mounted on the stand, fill the plug
assembly with water using a 60mL syringe. The sample volume is determined when it is
apparent that the water level is level with the fill port.
Figure 3 – Sample Injection
Vessel Disassembly
1. Remove the encoder assembly, disconnecting the cable and air-cooling tube.
2. Disconnect the high-pressure tube between the top cap of the vessel and the top panel
of the instrument. The nuts on each end of the tube require a 5/8-inch open-end
wrench.

2-4 SECTION 2 – OPERATING INSTRUCTIONS
3. Unscrew the top plug assembly from the vessel. The plug is loosened by turning
counterclockwise.
4. Once the plug assembly is removed, place the assembly in the plug support bracket.
Figure 4 - Plug Assembly in Stand
5. Remove the top cap, rotating counterclockwise. Remove the top o-ring and metal
backup ring. You may use the Seal Extractor tool 7500-2292, when necessary.
Replace the o-ring after each high temperature test.
Plug Support
Bracket
Plug Assembly
HP O-ring and
HP Backup Ring