Enerpac MITT Series User manual

Document Number: L4473
Document Revision: D
Document Revision Date: 28 Feb 2022
Document Language: ENGLISH EN
Operation and Maintenance Manual
Mechanical Isolation & Test Tools
Enerpac MITT Series
To reduce the risk of injury, user must read and understand this document before use.

For other languages go to www.enerpac.com.
Para otros idiomas visite www.enerpac.com.
Para outros idiomas consulte www.enerpac.com.
L4473_d
MITT SERIES
MECHANICAL
ISOLATION
AND
TEST TOOLS
Contents
1.0 INTRODUCTION ......................................................................................................................................... 1
2.0 SAFETY ....................................................................................................................................................... 1
3.0 FEATURES AND COMPONENTS............................................................................................................... 3
4.0 PREPARATION ............................................................................................................................................ 4
5.0 OPERATION ................................................................................................................................................ 5
6.0 MAINTENANCE......................................................................................................................................... 12
7.0 TROUBLESHOOTING ............................................................................................................................... 13
8.0 TECHNICAL DATA .................................................................................................................................... 17
9.0 TOP LEVEL ASSEMBLIES........................................................................................................................ 24
10.0 REPAIR PARTS LIST................................................................................................................................. 27
11.0 APPENDIX A - TOOL AND STANDARD PRESSURE GUIDE .................................................................38

L4473_d 1
1.0 INTRODUCTION
Overview
The Enerpac™ Mechanical Isolation and Test Tool
(MITT) is a dual purpose tool that provides a safe,
reliable and cost-eective means for the localized
isolation and pressure testing of piping. When installed
and functioned properly, the MITT creates a positive
vapor barrier to allow hot work to safely take place and
verifies the integrity of a newly welded or formed joint
through pressure testing.
The tool’s isolation function is as a Vapour
Barrier ONLY. Not to be used as a pressure plug.
There are two design types of the tool, single bolt and
multi bolt, that cover a size range from ¾” to 40”.
• Single bolt: ¾” to 2”
• Multi bolt: 3” to 40”
Custom tools and larger sizes are available upon
request, but may follow a unique set of instructions.
This document will detail the safe installation and
operation procedures required to be undertaken to
ensure the correct and safe deployment of the MITT,
in order to conduct localized isolation and weld testing.
Tools shall only be used by trained and
competent personnel.
Delivery Instructions
Upon delivery, all components must be inspected for
damage incurred during shipping. If damage is found,
the carrier should be notified at once. Shipping damage
is not covered by the Enerpac warranty.
Warranty
• Enerpac guarantees the product only for the
purpose for which is intended.
• Refer to the Enerpac Global Warranty document
for terms and conditions of the product warranty.
Any misuse or alteration invalidates the warranty.
• Observe all instructions as communicated in this
manual.
• Modification to any part of the equipment outlined
in this manual shall not be attempted, as it will
invalidate the warranty and can lead to serious
injury or death.
• When replacement parts are needed, use only
genuine Enerpac replacement parts.
Part Replacement
Check the Repair Parts Sheet (RPS) section of this
document, to order replacement parts when required.
WARNING
WARNING
2.0 SAFETY
Read all instructions carefully. Follow all recommended
safety precautions to avoid personal injury as well
as damage to the product and / or damage to other
property. Enerpac cannot be responsible for any
damage or injury from unsafe use, lack of maintenance,
or incorrect operation. Do not remove warning labels,
tags, or decals. In the event of any questions or concerns
arising, contact Enerpac or a local Enerpac distributor
for clarification.
If you have never been trained on high-pressure
hydraulic safety, consult your distributor or service
center for information about Enerpac Hydraulic Safety
Courses.
This manual follows a system of safety alert symbols,
signals, words, and safety messages to warn the user of
specific hazards. Failure to comply with these warnings
could result in death or serious personal injury, as well
as damage to the equipment or other property
The Safety Alert Symbol appears throughout
this manual. It is used to alert you to potential
physical injury hazards. Pay close attention
to Safety Alert Symbols and obey all safety
messages that follow this symbol to avoid the possibility
of death or serious injury.
Safety Alert Symbols are used in conjunction with certain
Signal Words that call attention to safety messages or
property damage messages and designate a degree or
level of hazard seriousness. The Signal Words used in
this manual are DANGER, WARNING, CAUTION, and
NOTICE.
Indicates a hazardous situation that, if not
avoided, will result in death or serious personal injury.
Indicates a hazardous situation that, if not
avoided, could result in death or serious personal injury.
Indicates a hazardous situation that, if not
avoided, could result in minor or moderate personal
injury.
Indicates information considered important,
but not hazard related (e.g. messages related to property
damage). Please note that the Safety Alert Symbol will
not be used with the signal word.
DO: an illustration showing how the tool should
be used.
DON’T: an illustration showing an incorrect way
to use a tool.
DANGER
WARNING
CAUTION
NOTICE

2L4473_d
2.1 Safety Precautions
Failure to observe and comply with the following
precautions could result in death or serious personal
injury. Property damage could also occur.
• Read and completely understand the safety
precautions and instructions in this manual before
operating the Mechanical Isolation and Test Tools
or preparing them for use. Always follow all safety
precautions and instructions, including those that
are contained within the procedures of this manual.
• Tools are not rated to hold back pressure - never
allow build up of pressure behind the tool, as this
can result in the tool ejecting and causing serious
bodily injury or death.
• Ensure all hydraulic components are rated to a
minimum safe working pressure of 5,000PSI.
• Do not overload equipment.
• Never exceed the safe maximum test pressure of
the pipe to be tested.
• Wear personal protective gear when operating
hydraulic equipment. Always wear eye protection.
Safety equipment such as dust mask, non-
skid steel-toed safety shoes, hard hats, gloves
or hearing protection (used as appropriate) will
reduce personal injuries.
• Applying pressure to a damaged hose may cause it
to rupture. Immediately replace worn or damaged
parts. Use only genuine Enerpac parts from
approved distributors or service centres. Enerpac
parts have been engineered and manufactured to
be fit-for-purpose.
• To minimise risk of personal injury keep hands
and feet away from the tool and workplace after
installation and torque operations are complete.
• Do not handle pressurised hoses; escaping
medium under pressure can penetrate the skin,
causing serious injury. Seek medical attention
immediately if oil penetration is suspected.
• Only pressurize complete and fully connected
hydraulic systems. Do not pressurize systems that
contain unconnected couplers.
• Always remain out of the line of fire of the tool after
installing the tool and actuating the seals.
• Always vent process vapors downwind at least 30
feet away to prevent risk of volatile atmosphere in
the hot work zone.
• During isolations, pressure between seals must be
verified/monitored regularly to ensure vapor barrier
is still in place.
• During isolations, pressure upstream of tool must
be verified / monitored constantly to ensure no
pressure build up.
• Never attempt to connect or disconnect hoses
while the system is pressurized.
• Becertainthatallhosecouplingsarefully connected
at both the pump and tool fittings before applying
any hydraulic pressure. If the couplings are not
fully connected, medium flow will be blocked, and
the tool could be subjected to excessive hydraulic
pressures. Catastrophic failure of tool could result.
WARNING
• Never apply more hydraulic pressure to any tool,
hose, fitting or accessory than the maximum
allowable pressure as stated in the manufacturer’s
specifications. The system operating pressure
must not exceed the pressure rating of the lowest
rated component in the system.
• Be sure the operator has completed safety induction
training, specific to the work surroundings. The
operator should be thoroughly familiar with the
controls and the proper use of the tool.
• The operator must be of at least the minimum age
required by applicable local regulations, laws and
the facility standard operating procedures.
• Never strike the tool while it is pressurized or under
load. Components under pressure may become
dislodged, allowing them to become dangerous
projectiles. Dislodged tools may result in loss of
seal / isolation and cause flammable or volatile
conditions.
• Avoid striking the tool at any time, even when it
is not pressurized or under load. Striking the tool
could cause permanent damage to components.
Failure to observe and comply with the following
precautions could result in minor or moderate personal
injury. Property damage could also occur.
• Inspect all ports, ensure they are clean and free
from obstruction.
• Ensure components are protected from external
sources of damage, such as excessive heat, flame,
moving machine parts, sharp edges and corrosive
chemicals.
• Take care to avoid sharp bends and kinks in
hydraulic hoses. Bends and kinks can cause
severe back-up pressure and cause hose failure.
Protect hoses from dropped objects; as a sharp
impact may cause internal damage to hose wire
strands. Protect hoses from crush risks, such
as heavy objects or vehicles; crush damage can
cause hose failure.
• Do not lift equipment by the hoses or couplers.
Use only the designated carrying handles.
• Equipment must only be serviced by a qualified
technician. For repair service, contact the Enerpac
Authorized Service Centre in your area.
• Rope o working area and place warning signs.
• Hot surfaces can be a major source of ignition.
Enerpac has designed and constructed the
MITT series tools to minimize the possibility of
an incendiary spark that may be caused by the
impact of aluminium components with corroded
steel. However, to reduce the chance of an
incendiary spark, use of the tools with corroded
steel structures or components should be avoided
whenever possible. Be especially careful to avoid
accidental impacts with the tools and corroded
steel.
CAUTION
NOTICE

L4473_d 3
3.0 FEATURES AND COMPONENTS
3.1 Single Bolt Configuration
Figure 1: Single Bolt Component Overview (Patent pending)
6
1 2 34
7
5
9 9
4
8
3.2 Multi-Bolt Configuration
5
1
2
3
6
4
7
8
8
Figure 2: Multi-Bolt Component Overview (Patent pending)
Key:
1. Nut
2. Washer
3. Collar
4. Spacer
5. Annular Ring
6. Mandrel
7. Seal Set
8. Internal Seal
9. Backing Rings
Key:
1. Back Plate
2. Front Plate
3. Annular Ring
4. Washer
5. Nut
6. Seal Set
7. Pipe
8. Backing Rings

4L4473_d
4.0 PREPARATION
4.1 Pre-Job Considerations
MITT components / assemblies may require lifting.
Ensure that there is adequate lifting equipment,
accessories and competent personnel to perform the
task.
All lines to be worked on should be blinded and vented
before any work begins. Lines must be depressurized
and monitored for pressure build up with a low pressure
gauge (0-15 psi recommended) prior to beginning work.
It is recommended that primary blinding/blocks/
isolations are of the double block and bleed type.
At no time should any person be allowed to
stand in the line of fire (open end of the pipe) while the
tool is installed in the line.
Figure 3:
High Risk Area
Low Risk Area
Low Risk AreaLow Risk Area
Low Risk Area
Low Risk AreaLow Risk Area
High Risk Area
Line of Fire Risk Areas
Once installed in a line, the tool shall be
monitored continually to assure no pressure build up
occurs behind the tool. Never leave a tool installed in
a line unattended while hot work is taking place in the
immediate job area.
Weld beads should be ground down to meet piping
specifications and piping edges must be deburred to
prevent seal damage as excessive weld beads may
prevent the tool from successful insertion in the pipe.
Prior to installation of the MITT tool, the immediate
installation area – including where the seals will land
– must be cleaned of any residual product, scaling or
corrosion.
4.2 Tool Preparation
4.2.1 Tool and Seal Selection
Select the appropriate tool to match the pipe diameter
and wall thickness as measured on location. Select
seals and seal backing rings (as needed) appropriate to
the pipe schedule and test pressure required. Refer to
Appendix A: Tool Standard Pressure Guide for selection.
Ensure the seal matches the tool size specification.
Before use, the seals and tool must be visually inspected
for any significant wear, damage, or issues with bonding.
It is recommended that an extra set of seals is available
for replacement as needed. Seal longevity is dependent
WARNING
WARNING
on test pressures, extrusion gap and pipe conditions
but may typically last between 5 and 10 uses.
Reference Appendix A: Tool Standard Pressure Guide
for tool / seal compatibility.
4.2.2 Gauge Selection
Adequately ranged pressure gauges are required for the
proper function of each port of the MITT during isolations
and pressure tests. Refer to the Operation sections for
appropriate gauge selection for each function (5.1 for
isolations and 5.2 for pressure testing).
4.2.3 Fittings
Selected fittings must be rated to the max pressure
capability of the pump being used.
Through-port vents are to remain as
threaded connections ONLY. Quick-disconnect fittings
of any type or style are NOT permitted to be used on
any through-port vent connections.
4.2.4 Lubricating studs / washers
Lubricating the studs and washers helps to transmit
the torque load to the seals. See below guidance for
lubricating the stud and washer. Section 8 provides
both lubricated and unlubricated torque values.
Caution must be taken to ensure the
lubricant does not come into contact with the seals
or tube ID. Failure to properly apply the lubricant on
the shaft threads and washers may cause incomplete
torque transmittal resulting in decreased pressure
holding capacity.
• Single bolt tool
Liberally spread lubricant over both sides of the washer
and on the threads of the stud shaft.
Figure 4: Single bolt tool
• Multi bolt tool
Liberally spread lubricant over both sides of all washers
and on the threads of all stud shafts.
Figure 5: Multi Bolt Tool
CAUTION
CAUTION
Stud
thread washer
Stud
thread
washer

L4473_d 5
5.0 OPERATION
Enerpac’s In-line Weld Test Tools feature double
block and bleed isolation. Once set in position these
tools provide a verified vapor barrier allowing hot
work activities to take place safely on-site. To test the
weld the same tool is repositioned over the weld area.
The weld test is typically undertaken using water as the
test medium, but can be undertaken using inert gas
where necessary.
MITT tools are actuated by applying torque to a single
fastener or multiple fasteners. Each style and size
requires dierent torque values and torqueing patterns.
The proper torque values shall be used for each tool and
can be found in Appendix A: Tool Standard Pressure
Guide.
Gauges must be selected properly to ensure safe
isolations.
• 0-100 PSI gauges shall be utilized to test/monitor
the integrity of the seals during positive pressure
isolations.
• 0-30 PSI, or lower, gauges installed on through-
port vent ports for the purpose of monitoring for
pressure build-up behind the MITT.
Prior to beginning work, ensure all tools and accessories
have been tested and/or calibrated and have valid test/
calibration labels.
Ensure each MITT has the proper fittings for each port
to mate with the ancillary equipment to be used during
operation.
During operation only use clean filtered water.
5.1 Isolations
To perform hydrodynamic isolations, MITT tools are
designed to be placed in piping upstream from the area
in which you want to perform any form of hot work.
The device seals and blocks one portion of the pipe
from the other, therefore isolating and containing the
work area from the rest of the piping system.
MITT tools are NOT to be used as a primary
means of creating an isolation point.
The devices have through-ports that are to remain open
for upstream gas and pressure monitoring. The purpose
of this port is to monitor upstream gas or pressure.
WARNING 1/2” tools (MITT050) do not have a through-
port due to the size of the tool. For these tools, it is
especially critical to have one or more upstream vents
which are monitored throughout the duration of the
isolation.
A hydrodynamic isolation requires the supply of a
continuous flow through the tool to dissipate the heat
from welding or stress relieving. The following shall
identify the basic steps required to accomplish a
hydrodynamic application of the Enerpac™ Isolation
Tool:
Note: Custom 3/4” - 4” hydrodynamic capable tools can
be ordered from Enerpac™.
5.1.1 Installation for Isolations
1. Install correctly chosen seals and seal backing
rings (if required) as per figures 1 and 2.
NOTICE
2. For isolations / vapor barriers, steel hard line
extensions shall be connected directly to the MITT
to transition past the heat aected zone due to
temperature limitations of flexible hose extensions
and better protect the lines against potential
abrasions. Flexible hoses can be connected to the
hard lines once past the heat aected zone.
3. Insert and position the tool in the pipe as far as
possible from the hot work area to ensure minimal
heat exposure to the seals – must be a minimum
of 6 inches, although 12 inches is recommended.
4. Ensure fill and vent fittings are positioned 6 o’clock
and 12 o’clock respectively to allow the test
medium to properly fill the tool cavity and bleed
o air.
5. Torque the tool nuts to compress the seals until
initial contact is made with the piping internal
diameter
• For single bolt tools, tighten using a cresent
wrench. Tighten the nut until the tool is stationary
and a seal is achieved. Care must be taken not to
exceed the max torque value specified in Section 8
of this manual. The nut must always be accessible.
• For single bolt tools, the tool shall be held as
concentric to the pipe as possible during torqueing
operation to aid correct seating of seals.
• For multi-bolt tool systems, a torque wrench
may be used to tighten the compression nuts to the
ASME PCC-1 Alternate Assembly Pattern #3.
6. Connect all the hoses and accessories as per
Figure 6 except for the isolation gauge. Fill the tool
until the test medium begins to seep out of the
upper fitting. Attach the isolation gauge.
7. If necessary torque the nuts to the value as detailed
in Section 8 following ASME PCC-1 Alternate
Assembly Pattern #3
8. Pressurize the tool and close the inlet valve to
verify hydrostatic seal can be maintained to the
required pressure. Recommended minimum of 50
PSI be held for duration of installation.
9. Attach pipe assembly, vent hose and low
pressure gauge to the through-port, per figure 4.
All threaded connections shall be wrapped with
Teflon tape. Route the attached vent hose a
minimum of 30 feet, downwind of the work area in
a safe location. Be mindful of any other potential
ignition sources when routing the vent hose.
NOTICE
Please note that 1/2” tools cannot
connect to a vent hose. For these tools, it is
especially critical to have one or more upstream
vents which are monitored throughout the duration
of the isolation.
The vent port shall:
• Have only approved hoses or fittings connected
to it
• Have all approved hoses or fittings arranged
such that inline vapors are always vented to
a safe distance and location away from the
isolation point
• Have an inline gauge connected to allow
continuous pressure monitoring, see figure 6.

6L4473_d
The vent port shall not:
• Be blocked o by any means
• Be modified in any way
• Be blocked by debris
• Have any connections that do not allow vapor
to vent properly to a safe distance and location
away from the isolation point
• Ever be used as a port to introduce pressure
behind the tool
Should the vent port be blocked by debris, the
debris shall be cleared in a manner so as to not
damage the threads.
Should the threads be damaged in any way, the
tool shall not be used.
Once the seal has been proven hydrostatically,
connect a supply hose to the inlet (lower) fitting
on the Enerpac™ MITT and open the inlet valve.
Quick disconnect connections are NOT
permissible for any portion of the through-port monitor
assembly.
For multi-bolt hydrodynamic isolations
the front of the MITT must be packed with insulation
to protect from radiant heat for any heat treatment
processes. Improper shielding may result in tool and
seal damage potentially catastrophic to the function of
the isolation/vapor barrier.
10. Open the discharge valve suciently to establish
a flow through the Isolation Tool while maintaining
a pressure within the Tool cavity (monitored at the
inlet).
11. The flow through the Tool will need to be enough
to prevent overheating of the Seal. Discharge flow
from the Tool should be no more than warm to the
touch.
12. Both inlet and outlet pressures must be monitored.
A decrease in the outlet pressure and flow without
a corresponding decrease in the inlet pressure can
indicate a problem with the seals.
At no time should the isolation installer(s) or
any other personnel perform hot work without a gas test
and without authorization from the installer.
5.1.2 Reactivate an Unattended Isolation
An isolation shall never be left unattended,
but in the event that a technician must approach an
unattended isolation, the following steps shall be
followed:
1. Installing technician to request a gas test prior to
entering the area.
2. Installing Technician to visually inspect Enerpac
Isolation gauges and seal for condition.
3. Seals must be reverified, as per section 5.1.1, step
8.
4. Adjustments to the Tool are to be made until a new
isolation seal is proven.
5. The Isolation Installer will notify the customer
representative that it is safe to begin hot work in
the area. They will monitor the isolation while work
is in progress and until the work has been stopped
or has been completed.
WARNING
NOTICE
CAUTION
WARNING
5.1.3 Monitoring Isolations
To monitor the isolation while work is being performed,
ensure the following:
• While the tool is installed, at no time can parts (vent
gauges or hoses) be removed. Welders and Pipe
fitters may request to have the venting apparatus
temporarily removed so that they can perform their
work and have easier access to the work. This
practice is strictly forbidden.
Constant monitoring is required to ensure
there is no back pressure build -up.
Removing the venting assembly negates the
use of the MITT as an isolation / vapor barrier and likely
creates a volatile and/or flammable atmosphere.
• Only trained installers are authorized to monitor
isolation.
• No hot work can be performed in the aected area
unless isolation tool seal is checked and monitoring
of Isolation Tool gauges occurs.
• Loss of pressure shown on the pressure gauge
represents one seal has failed. Work is to be
stopped immediately until the Isolation seal is re-
checked and proven.
• Increase of pressure shown on the pressure gauge
represents an increase of temperature of the pipe.
If pressure is increased too high, it is possible one
of the seals may leak. Reduce the pressure to
maintain a pressure between 20-50psi.
• Pressure increase on vent gauge represents a
build-up of upstream pressure / product behind
the Isolation Tool. Work is to stop immediately, and
area cleared until upstream pressure is reduced to
acceptable levels, prior to continuing work in the
area.
• At NO TIME shall any personnel be standing or
monitoring gauges directly in front of the isolation
tool. All workers are to remain o to the side and
out of the “LINE OF FIRE.”
• When an Isolation Tool is left unattended, a
warning sign MUST be placed in the area to alert
any personnel that a Enerpac™ MITT is in place.
• Once the weld has been completed and cooled
down, the isolation can be removed.
5.1.4 Removal of an Isolation
1. Notify operations that an isolation needs to be
removed
Verify that there is no back pressure or
product behind the tool
Prior removal of any equipment, ensure that
a representative from the safety department is present
with a gas monitor to monitor for any flammable/noxious
gases during the subsequent steps.
2. Loosen and remove the vent gauge, vent hose,
and vent pipe.
3. Bleed o the pressure from the annulus.
4. Remove the inlet and outlet hoses.
5. Gradually loosen nuts evenly to prevent stud
overload/damage. After several passes on
NOTICE
DANGER
DANGER
DANGER

L4473_d 7
loosening the studs, the tool will gain clearance
from the pipe and can be removed. If needed, use
a twisting motion while pulling to aid in removal.
5.2 Pressure Testing
Mechanical Isolation & Test Tools are designed to be
installed into the pipe to perform a localized hydrostatic
test in a specific weld area. Each tool contains two
parallel seals with a test chamber located in between
them. The tool must be inserted into the pipe such that
the seals straddle the weld.
Prior to beginning, pressure gauges must be selected to
match the specific test application. Assure the selected
gauge has a current calibration certificate. Proper
gauge selection shall preferably have dials graduated
over a range of approximately double the intended test
pressure. In no case should the upper limit of the gauge
be less than 1-1/2 times that pressure, nor more than
4 times the test pressure. Refer to the table below for
recommended selection criteria.
Gauge Range
(PSI)
Suitable for Tests
From To
0-30 7.5 20
0-60 15 40
0-100 25 66
0-160 40 106
0-200 50 133
0-300 75 200
0-600 150 400
0-1000 250 666
0-2000 500 1333
0-5000 1250 3333
0-10000 2500 5333
1. Install correctly chosen seals and seal backing
rings (if required) as per Appendix A: Tool and Seal
Index Table.
2. Insert and position the MITT tool such that the
weld being tested is centered between the two
Seals, if possible.
3. Ensure fill and vent fittings are positioned 6 o’clock
and 12 o’clock respectively to allow the test
medium to properly fill the tool cavity and bleed
o air.
4. Torque the tool nuts to compress the seals until
initial contact is made with the piping internal
diameter.
• For single bolt tools, tighten using a crescent
wrench. The nut must always be accessible.
• For multi-bolt tool systems, a torque wrench
may be used to tighten the compression nuts
to the ASME PCC-1 Alternate Assembly
Pattern #3.
5. Once the initial actuation is complete (the primary
torque value is achieved), allow 5 minutes for
relaxation of the seals. Check the torque applied
prior to flooding the test chamber.
6. To introduce test medium into the cavity of the
weld test tool, there are unique steps for single-
bolt and multi-bolt tools to purge the air from the
test chamber.
• For single-bolt tools:
i. Lightly actuate the seals until they fully make
contact with the pipe ID.
ii. Connect the test manifold, test gauge and other
ancillaries, as normal
iii. Fill the test chamber and begin to build pressure
untiltheairisexpelledwherethepipeIDandseals
make contact
iv. Once the test medium begins to seep out, stroke
the pump a few more times until only the test
mediumisleaking.Thisisreferredto“burpingthe
tool” to purge the air from the test chamber.
v. Close the valve on the test manifold.
vi. Lightly tighten the compression nut to make
further pipe wall contact.
• For multi-bolt tools:
i. Connectahosefromthepumptothelowerfitting
and fill until medium begins to seep out of the
upper fitting, then attach all hoses.
7. Install selected pressure gauges via quick
disconnects.
8. Tighten fasteners to within the specified torque
range in 25% increment steps of the desired
torque until the desired torque value is achieved.
Note: Some pressure may build up within the
test cavity due to the compression of the area. If
pressure buildup is greater than 10% of the desired
test pressure, bleed the test cavity via the relief
valve of the pump to zero and continue to torque.
Repeat if necessary.
• Torquing while under pressure of the test medium
may cause one, or both, of the seals to roll from
outside the seal retaining area. Should this occur,
the seals will be damaged, unable to retain test
pressure, and will cause the Enerpac MITT to
become stuck within the pipe.
• For applications with lower pressures and/or higher
extrusion gaps, lower torque values are acceptable
and often preferred to prevent seal extrusion.
• For applications with higher test pressures and
seal backers are not available, extra care may
be required to torque the studs and pressurize to
intermediate levels and longer intermediate hold
times (still via ASME PCC-1 Alternate Assembly
Patterns) as this will help to solidify the seals.
9. Once the desired torque value has been achieved,
pressurize the test cavity in 25% increments of the
prescribed test pressure. At each increment, stop
and hold the pressure for the minimum of 1 minute.
If possible, visually inspect the tool, looking for
puddling of test medium or other signs of a leak
occurring.
10. After the test pressure has been held for the
specified amount of time and the Customer /
Inspector confirms that their requirements have
been satisfied, release the pressure to zero and
recover test medium.

8L4473_d
11. Disconnect gauge and pump hose assemblies.
12. Loosen the fasteners. Note that with multi-bolt
tools to loosen no more than 3 turns per fasteners
to evenly unload the torque and not overload a
single stud.
13. Remove the tool from the pipe.
14. Visually inspect seals to determine if they are in
good condition for further use or must be replaced.
15. Safely package the MITT tool for transport and
storage in a way to prevent damage.