Durametallic® MD-200 Series
Conditioned Gas Dual Cartridge
Canister Seal for Mixers and Agitators
Installation
Instructions
Experience In Motion
1 Equipment Check
1.1 Follow plant safety regulations prior to equipment disassembly:
• Consult the plant Material Safety Data Sheet (MSDS) les for
hazardous material regulation.
• Wear designated personal safety equipment.
• Lock out the mixer or agitator motor and valves to and from
the vessel.
• Relieve any pressure in the vessel.
• Use plant vessel entry procedures if it is necessary to enter
the vessel.
1.2 Secure the mixer or agitator shaft in accordance with the mixer
or agitator manufacturer’s instructions.
1.3 Remove the coupling and/or drive to access the seal area.
Follow the manufacturer’s instructions.
1.4 Remove the existing seal assembly.
1.5 Remove all burrs and sharp edges from the shaft and vessel
ange area. The shaft and vessel ange must be free of burrs,
sharp edges, cuts, dents, or corrosion that might cause leakage
past the sleeve packing O-rings and the vessel ange O-ring
gasket.
1.6 Check requirements for the shaft and the vessel ange.
They must agree with the dimensions shown in Figure 1.
1.7 Check the assembly drawing accompanying the seal assembly
for specic seal design data, materials of construction, dimensions,
and recommended piping connections.
1.8 Check the shaft OD, vessel ange bolt size, bolt circle, and
distance to the coupling or drive to ensure that these dimensions
agree with the seal assembly drawing provided.
1.9 Handle the seal assembly with care, it is manufactured to
precise tolerances. The sealing faces of the rotors and the stators
are of special importance. These sealing faces are lapped to rigid
specications required for contacting face gas seals. If it becomes
necessary to disassemble the seal, keep these sealing faces
clean and dry at all times and protect them from damage
since they are subject to impact fracture.
The images of parts shown in these instructions may differ visually from the actual
parts due to manufacturing processes that do not affect the part function or quality.
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1.10 Pressure testing of this cartridge canister dual seal prior to
installation is possible using ltered dry nitrogen or instrument air.
Consult Flowserve, Flow Solutions for acceptable gas leakage rates
for this seal design.
Mixer/Agitator Shaft and Flange Requirements Figure 1
To rst obstruction
(See assembly drawing)
Shaft OD to be +0.025 mm
(+0.001 inch)
-0.025 mm
Face of vessel ange to
be square to the axis of
the shaft to within 0.25 mm
(0.010 inch) FIM and have
a √1.6 µm (63 µinch) Ra
nish or better
(-0.001 inch)
with a surface nish of √ 0.8 µm
(32 µinch) Ra or better
• Bearings, drive, and coupling must be in good condition
• Maximum vertical shaft movement (axial end play) = 0.61 mm (0.024 inch) FIM
• Maximum static vessel ange out of concentricity = 0.50 mm (0.020 inch) FIM
• Maximum static vessel ange to shaft out of squareness = 0.25 mm (0.010 inch) FIM
• Maximum dynamic shaft deection = 3 mm (0.125 inch) FIM
The MD-200 Seal design may include an optional radial bearing in
the canister to protect the seal from excessive shaft runout or whip.
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2 MD-200 Seal Installation
Tools needed:
Tools provided:
• Lubricant for O-rings and equipment shaft OD.
Tools not provided:
• Wrenches to secure housing nuts or bolts
• Allen wrenches for housing cap screws
• Allen wrenches for seal setting devices and set screws
2.1 Install the seal adapter plate on the vessel ange if required.
2.2 Lightly lubricate the equipment shaft along the entire length the
gasket O-rings will contact the shaft. Use the lubricant provided if it is
compatible with the process uid.
2.3 Secure the vessel ange O-ring in the gasket O-ring groove using
the lubricant provided if it is compatible with the process uid.
2.4 Install the MD-200 Seal onto the equipment shaft with the end
containing the setting devices toward the equipment drive end and
position the seal assembly onto the vessel ange. Use the lifting
eyes supplied to gently lower the canister assembly onto the adapter
plate. Do not bolt the canister seal assembly to the adapter plate or
vessel ange at this time. Care should be exercised when passing
the seal sleeve incorporating the sleeve packing O-rings over any
keyways or threads that may be present. Any steps or shoulders on
the equipment shaft should be beveled to prevent damage (pinching
and cutting) of these sleeve packing O-rings during installation.
2.5 Position the canister seal assembly so that the barrier gas ports
and any optional bearing lubrication ttings are easily accessible.
2.6 Reinstall the shaft coupling and/or drive. Remove any shaft
holding or restraining clamps and complete adjustments so that
the shaft is in its nal operating position.
2.7 Install and tighten the vessel ange studs or cap screws to
secure the canister seal assembly to the vessel ange or adapter
plate. Do not over tighten.
2.8 Tighten the set screws in the sleeve drive collar uniformly with an
Allen wrench.
2.9 Remove the setting devices. Save the setting devices and
attachment hardware for future use.
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3 Seal Barrier Gas Supply
The standard MD-200 seal design, using #22 carbon rotor faces, is
engineered to operate with non-humidied gas supplied to the seal
chamber at a consistent pressure 2 bar (25 psig) above the maximum
vessel pressure. Nitrogen gas is the barrier uid of choice. The gas to be
used, maximum vessel pressure, shaft speed, temperature, equipment
and shaft size must be specied when the seal is ordered.
Note: MD-200 seal designs using #5 carbon rotor faces, still require a
conditioned or humidied barrier gas. Nitrogen gas, humidied with a
polar compound (water), is the barrier uid of choice.
4 MD-200 Seal Piping
4.1 Install piping for the clean nitrogen to the canister tap. A lter,
pressure regulator, ow meter, check valve and pressure indicator
are recommended.
Note: A conditioner or humidier is recommended when using MD-200
with #5 Carbon rotor faces.
4.2 Bearings (optional) have been pre-lubricated during seal assembly.
Recommended Piping for Dual Conditioned Gas Seal
Figure 2
N
Source
Filter
Pressure
Indicator
Barrier
Gas
Inlet
Bypass
Flow
Meter
Humidier
(optional: use only with
#5 carbon rotor faces)
Pressure
Regulator
Check
Valve
2
5
5 Seal Operation
To assure reliable operation of this sealing product, the following
operating guidelines should be observed.
5.1 Maintain the gas (non-conditioned or conditioned) supply
pressure both while the seal is operating and when the equipment
is on standby. Always ensure that there is an adequate ow of
barrier gas to the seal.
5.2 Do not exceed the maximum barrier pressure specied for the
seal design. The barrier pressure should be 2 bar (25 psig) above
the operating vessel pressure.
5.3 Do not exceed the maximum vessel pressure specied for the
application. This could reduce the recommended vessel to barrier
differential pressure which could adversely affect seal performance.
5.4 Do not exceed the maximum vessel temperature specied for
the application. This could exceed the temperature limits of the seal
materials of construction applied to the application.
5.5 Do not exceed the seal material corrosion limits. This seal was
designed for the application shown on the seal assembly drawing.
Do not exceed the limits of the material alloys and elastomers
supplied in its construction.
For special problems encountered during installation, contact your
nearest Flowserve Sales and Service Representative or Flowserve
Authorized Distributor.
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6 Repair
This product is a precision sealing device. The design and dimension
tolerances are critical to seal performance. Only parts supplied by
Flowserve should be used to repair a seal. To order replacement parts,
refer to the part code and B/M number. A spare backup seal should be
stocked to reduce repair time.
When seals are returned to Flowserve for repair, decontaminate the
seal assembly and include an order marked "Repair or Replace."
A signed certicate of decontamination must be attached.
A Material Safety Data Sheet (MSDS) must be enclosed for any
product that came in contact with the seal. The seal assembly will be
inspected and, if repairable, it will be rebuilt, tested, and returned.
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TO REORDER REFER TO
flowserve.com
B/M #
F.O.
FIS103eng REV 08/12 Printed in USA
To find your local Flowserve representative
and find out more about Flowserve Corporation,
visit www.flowserve.com
Flowserve Corporation has established industry leadership in the design and manufacture of its products. When properly
selected, this Flowserve product is designed to perform its intended function safely during its useful life. However,
the purchaser or user of Flowserve products should be aware that Flowserve products might be used in numerous
applications under a wide variety of industrial service conditions. Although Flowserve can provide general guidelines,
it cannot provide specific data and warnings for all possible applications. The purchaser/user must therefore assume
the ultimate responsibility for the proper sizing and selection, installation, operation, and maintenance of Flowserve
products. The purchaser/user should read and understand the Installation Instructions included with the product, and
train its employees and contractors in the safe use of Flowserve products in connection with the specific application.
While the information and specifications contained in this literature are believed to be accurate, they are supplied for
informative purposes only and should not be considered certified or as a guarantee of satisfactory results by reliance
thereon. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding any
matter with respect to this product. Because Flowserve is continually improving and upgrading its product design,
the specifications, dimensions and information contained herein are subject to change without notice. Should any
question arise concerning these provisions, the purchaser/user should contact Flowserve Corporation at any one of
its worldwide operations or offices.
© 2012 Flowserve Corporation
USA and Canada
Kalamazoo, Michigan USA
Telephone: 1 269 381 2650
Telefax: 1 269 382 8726
Europe, Middle East, Africa
Dortmund, Germany
Telephone: 49 231 69640
Telefax: 49 231 6964 248
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