Flowserve Durametallic Double CRO User Manual
Durametallic® Double CRO
Dual single coil spring friction
drive for applications with
water lubrication properties
Installation
Instructions
Experience In Motion
1 Equipment Check
1.1 Follow plant safety regulations:
• lock out motor and valves.
• wear designated personal safety equipment.
• relieve any pressure in system.
• consult plant MSDS les for hazardous material regulations.
1.2 Adjust the bearings, coupling, and impeller so that the shaft is
in its operating axial position. Disassemble equipment to allow
access to seal installation area.
1.3 Remove all burrs and sharp edges from the shaft, sleeve, seal
housing bore and face, keyways, and any other feature that may
contact sealing gaskets. Replace worn components. Clean all
piping plans.
1.4 Check requirements for shaft, sleeve, and seal housing.
See Figure 1.
Seal Chamber Requirements Figure 1
To first obstruction
Face of seal housing to be square to the
axis of the shaft to within 0.0005 mm/mm
(0.0005 inch/inch) of seal chamber bore TIR
and have a 1.6 μm (63 μinch) R finish or better
a
Gland pilot can be at either of these
register locations, concentric to within
0.125 mm (0.005 inch) of shaft or
Seal housing bore to have 3.2 μm
(125 μinch) R finish or better
Sleeve or shaft finish to be
0.8 μm (32 μinch) R or better
• Bearings must be in good condition
• Maximum lateral or axial movement of shaft (end play) = 0.25 mm (0.010 inch) TIR
• Maximum shaft runout at face of seal housing = 0.05 mm (0.002 inch) TIR
• Maximum dynamic shaft deflection at seal housing = 0.05 mm (0.002 inch) TIR
a
a
sleeve OD TIR
Shaft or sleeve OD
+0.000 mm (+0.000 inch)
-0.050 mm (-0.002 inch)
+0.000 mm (+0.000 inch) API 610/682
-0.025 mm (-0.001 inch) DIN/ISO
ANSI
1.5 Check assembly drawing included with the Double CRO seal for
specic seal design, materials of construction, dimensions, and
piping connections.
1.6 Check shaft or sleeve OD, box depth, box bore, and distance
to the rst obstruction to ensure that they are dimensionally the
same as shown on the seal assembly drawing.
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.
2
1.7 Check gland pilot and bolt holes to ensure they are adaptable
to the equipment and are the same as shown on the assembly
drawing.
1.8 Handle all seal parts with care, they are manufactured to precise
tolerances. The seal faces; rotating face and stationary face, are
of special importance. These two sealing faces are lapped at to
within three light bands (34.8 millionths of an inch).
Keep the seal faces perfectly clean at all times.
1.9 Do not use oil or silicone lubricant on the shaft or sleeve of this
friction driven seal. Use water or a mild water soluble soap solution
to ease installation.
2 Installation on Single End Suction Vertical Split Case
and Vertical In-Line Pumps (1 seal chamber)
2.1 Lubricate one of the two stationary face seat gasket O-rings
with water or mild water soluble soap solution and nest this O-ring
in the gland cavity. Press the stationary face into the gland
with the sealing face orientated toward the inboard side of the
gland. Use hand pressure only. Position the gland over the shaft
or sleeve with the sealing face orientated toward the seal chamber
(stufng box). Place the gland as close to the bearing bracket as
possible. Do not bump the stationary face against the shaft as it
may chip, crack, or break.
2.2 Lubricate the shaft or sleeve with water or soap solution.
2.3 Install the rotating seal parts on the shaft or sleeve one piece
at a time:
• Outer rotating face with rotating face gasket O-ring.
• Single coil spring.
• Inner rotating face with rotating face gasket O-ring.
The rotating seal parts should be as close to their nal axial position as
possible with the rotating face sealing surfaces facing away from the
spring and toward the stationary face sealing surfaces.
2.4 Lubricate the seal chamber bore with water or soap solution.
The seal chamber is usually the stufng box contained in the
pump back plate.
3
Loading...