Installation
Instructions
Experience In Motion
Single Inside Pusher Type Seals
BPO, BPT, BRO, BRT, PTO, PT, RO, RO-TT,
and others
1 Equipment Check
1.1 Follow plant safety regulations prior to equipment disassembly:
1.1.1 Wear designated personal safety equipment
1.1.2 Isolate equipment and relieve any pressure in the system
1.1.3 Lock out equipment driver and valves
1.1.4 Consult plant Safety Data Sheet (SDS) files for hazardous material regulations
1.2 Disassemble equipment in accordance with the equipment manufacturer’s instructions
to allow access to seal installation area.
1.3 Remove existing sealing arrangement (mechanical seal or otherwise).
Clean seal chamber and shaft thoroughly.
1.4 Inspect surfaces under gaskets to ensure they are free from pits or scratches. Break all sharp
corners on shaft steps, threads, reliefs, shoulders, key ways, etc. over which gasket(s) must
pass and/or seal against.
1.5 Check shaft or sleeve OD, seal chamber bore, seal chamber depth, gland pilot, stud diameter,
stud bolt pattern and distance to first obstruction to ensure they are dimensionally the same
as shown in the seal assembly drawing.
1.6 Check seal assembly drawings for any modifications (reworks) to be made to the equipment
for mechanical seal installation and act accordingly.
1.7 The equipment must be earthed to prevent sparks due to static electricity discharge.
2
Shaft runout should be checked against the equipment manufacturer‘s specifications.
Generally, should not exceed 0.05 mm (0.002 inch) TIR (Total Indicator Reading)
at any point along the shaft for ball or roller type bearings.
For sleeve type bearings, refer to manufacturer instructions.
If the equipment is not completely dismantled, verify runout
near seal location.
The above values apply to shaft speeds in the range from
1000 to 3600 RPM. For values above and below, consult your
Flowserve representative. See Figure 1.
Shaft endplay should not exceed 0.25 mm (0.010 inch) TIR,
regardless of thrust bearing type. See Figure 2.
Radial bearing play at seal chamber face should be checked
against the equipment manufacturer’s specifications. Generally
0.05 - 0.10 mm (0.002 - 0.004 inch) will be applicable for ball o
r
roller type bearings. For sleeve or journal type bearings, values
will generally be in the order of 0.10 - 0.15 mm (0.004 - 0.006 inch).
If equipment is found outside the general range, contact the
equipment manufacturer and your Flowserve representative
to verify the equipment’s suitability for the seal.
Seal chamber squareness to the shaft centerline should
be within 0.0005 mm/mm (0.0005 inch/inch) of seal
chamber bore TIR.
Note: make sure that shaft endplay does not affect
the reading. Verify the smoothness of the seal
chamber face for a good gasket joint. See Figure 3.
Concentricity of the shaft to the seal chamber bore or gland
pilot register should be within 0.025 mm per 25 mm shaft
diameter (0.001 inch per 1 inch shaft diameter)
to a maximum of 0.125 mm (0.005 inch) TIR.
See Figure 4.
Figure 4
Figure 3
Figure 1
Figure 2
Surface finish requirements
Figure 5
To first obstruction
Seal housing face to have a surface finish
of 1.6 μm (63 μinch) R
a
finish or better
Scribe
Mark A
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
Scribe
Mark B
Seal housing bore to have 3.2 μm
(125
μ
inch)
Ra finish or better
ANSI
Sleeve or shaft finish to be
0.8 μm (32 μinch) R
a
or better.
Gland pilot can be at either
of these register locations.
Single Inside Pusher Type Seal Installation
2 Single End Suction Vertical Split Case Pumps (1 box)
2.1 Scribe mark A on the shaft or sleeve to line up with the face of the seal housing.
2.2 Scribe mark B at the seal setting point shown enclosed in a rectangular box on the assembly
drawing included with the seal. This seal setting dimension is measured from the face of the
seal housing to the back of the spring holder. The back of the spring holder will be located at
this point.
2.3 Lubricate the shaft or sleeve lightly with the lubricant provided with the seal before installing
any seal parts.
2.4 Lightly lubricate O-ring or Duraflex seat gasket.
2.5 Press the stationary face into the gland (flexibly mounted stationary faces only). Use hand
pressure only. Where a face has an O-ring mounting on the back shoulder, it is usually better
to nest this O-ring into the gland cavity and then push the face into the nested O-ring.
2.6 Install the gland with stationary face over the shaft. 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.
2.7 Install the rotating face gasket into the bore of the rotating face.
2.8 Install the rotating face components on the shaft or sleeve in the proper sequence. Handle
PTFE U-cup rings and Durafite rotating face gaskets with extreme care. PTFE U-cup rings must
be assembled individually and not pushed on the shaft or sleeve while they are installed on the
rotating face. Avoid nicking or pinching either lip of the U-cup ring. Use both U-cup rings, they
work together to form an effective seal.
2.9 Set the back of the spring holder at reference mark B, Figure 5, and tighten set screws firmly
and evenly. The rotating component assembly is now in the proper position to provide the
correct setting and spring compression for final assembly.
2.10 Wipe the seal faces clean with alcohol before completing equipment assembly.
Seal faces should not be lubricated, but should be left clean and dry.
2.11 Assemble the pump.
2.12 Position the gland to the face of the seal housing. Be sure the gland pilot is properly engaged.
Tighten the gland stud nuts evenly, cross stagger the adjustment of the nuts. Follow the
equipment manufacturer's recommendations for gland stud nut torque. In the absence of
recommendations, gland nuts should only be torqued to establish a leak tight seal at the gland
gasket. Proper gland bolt adjustment is especially important with clamp style stationary faces
where excessive torque may damage the face.
2.13 See Operational Recommendations before starting pump.
3
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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