Flowserve MD-200 Series Durametallic User Manual
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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