Flowserve Durametallic P-50 User manual

Installation
Instructions
Durametallic® P-50
Experience In Motion
A cartridge mounted, flexible stator
pusher seal design for general
service applications

2
Congratulations
You have just purchased a reliable, long-life product manufactured by
the leading manufacturer of sealing systems in the world. With proper
installation and operation, this P-50 seal can be a valuable contributor to
your operation by signicantly reducing the mean time between planned
maintenance (MTBPM) of your rotary equipment.
Description
This P-50 seal is a cartridge mounted mechanical seal, designed for
ease of installation and reliable operation. No seal setting dimensions
are required. Removable setting devices provide proper alignment.
The exible stationary face design compensates for inadvertent mis-
alignment of the seal chamber face. Multiple springs provide uniform
face loading and are external of the pumpage, resisting clogging or
hang-up. Installation according to the following steps will assure long
trouble free life of the P-50 seal.
1 Equipment Check
1.1 Follow plant safety regulations prior to equipment disassembly:
• Lock out motor and valves.
• Wear designated personal safety equipment.
• Relieve any pressure in the system.
• Consult plant MSDS les for hazardous material regulations.
1.2 Disassemble equipment in accordance with equipment
manufacturer's instructions to allow access to seal installation
area.
1.3 Remove existing mechanical seal and gland or compression
packing and packing gland.
1.4 Make sure the shaft or sleeve and the seal housing face are
clean and free of burrs, cuts, dents, or corrosion that might cause
leakage past the sleeve gasket O-ring or gland gasket. Replace
worn shaft or sleeve. Remove sharp edges from keyways and
threads.
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.

3
Seal Chamber Requirements Figure 1
1.5 Check equipment dimensions to ensure that they are within the
dimensions shown in Figures 1 and 2. Critical dimensions include
shaft or sleeve OD (A), a chamber depth of at least 25.4 mm
(1.000 inch), minimum and maximum seal housing bore (B), and
the minimum distance to the rst obstruction (F).
1.6 Check gland bolting to ensure that bolt diameter and bolt circle
conform to he dimensions shown in Figure 2.
1.7 Handle the P-50 with care, it is manufactured to precise
tolerances. The stationary and rotating sealing faces are of
special importance. They are lapped at to within three light
bands (34.8 millionths of an inch). Keep the seal faces perfectly
clean at all times.
To first obstruction
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
ASME
Seal housing face to have surface finish
of 1.6 μm (63 μinch) Rafinish or better.
Gland pilot can be at either
of these register locations.
Seal housing bore to have 3.2 μm
(125 μinch) Rafinish or better.
Sleeve or shaft finish to be
0.8 μm (32 μinch) Raor better.

4
1.000 1.625 2.000 1.50 1.750 1.88 2.00 3.69 - 3.75 1.19 2.75 2.88
1.125 1.750 2.125 1.62 1.875 1.88 2.00 3.81 - 3.88 1.19 2.88 3.00
1.250 1.875 2.250 1.75 2.000 1.88 2.00 4.19 - 4.25 1.19 3.00 3.12
1.375 2.000 2.375 1.88 2.125 1.88 2.00 4.19 - 4.25 1.19 3.12 3.25
1.500 2.250 2.625 2.12 2.375 1.88 2.00 4.69 - 4.75 1.19 3.44 3.56
1.625 2.375 2.750 2.25 2.500 1.88 2.00 4.69 - 4.75 1.19 3.56 3.69
1.750 2.500 2.875 2.38 2.625 1.88 2.00 4.94 - 5.00 0.96 3.62 3.75
1.875 2.625 3.000 2.50 2.750 1.88 2.00 4.94 - 5.00 1.19 3.75 3.88
2.000 2.750 3.125 2.62 2.875 1.88 2.00 5.06 - 5.12 1.19 3.94 4.06 4.25
2.125 2.875 3.250 2.75 3.000 1.88 2.00 5.94 - 6.00 1.06 4.06 4.19 4.38
2.250 3.000 3.375 2.88 3.125 1.88 2.00 6.44 - 6.50 1.19 4.19 4.31 4.50
2.375 3.250 3.625 3.12 3.375 2.00 2.12 6.31 - 6.38 1.19 4.44 4.56 4.75
2.500 3.375 3.750 3.25 3.500 2.00 2.12 6.56 - 6.62 1.00 4.56 4.69 4.88
2.625 3.500 3.875 3.38 3.625 2.00 2.12 7.19 - 7.25 1.19 4.69 4.81 5.00 5.25
2.750 3.625 4.000 3.50 3.750 2.00 2.12 7.69 - 7.75 1.19 4.81 4.94 5.12 5.38
2.875 3.750 4.125 3.62 3.875 2.00 2.12 7.94 - 8.00 1.19 4.94 5.06 5.25 5.50
3.000 3.875 4.250 3.75 4.000 2.00 2.12 8.06 - 8.12 1.19 5.06 5.19 5.38 5.62
3.125 4.000 4.375 3.88 4.125 2.00 2.12 8.19 - 8.25 1.19 5.19 5.31 5.50 5.75
3.250 4.125 4.500 4.00 4.250 2.00 2.12 8.31 - 8.38 1.19 5.31 5.44 5.62 5.88
3.375 4.250 4.625 4.12 4.375 2.00 2.12 8.44 - 8.50 1.19 5.44 5.56 5.75 6.00
3.500 4.375 4.750 4.25 4.500 2.00 2.12 8.56 - 8.62 1.19 5.56 5.69 5.88 6.12
3.625 4.500 4.875 4.38 4.625 2.00 2.12 8.69 - 8.75 1.19 5.69 5.81 6.00 6.25
3.750 4.625 5.000 4.50 4.750 2.00 2.12 8.81 - 8.88 1.19 5.81 5.94 6.12 6.38
3.875 4.750 5.125 4.62 4.875 2.00 2.12 8.94 - 9.00 1.19 5.94 6.06 6.25 6.50
4.000 4.875 5.250 4.75 5.000 2.00 2.12 8.94 - 9.00 1.19 6.06 6.19 6.38 6.62
A
Shaft & B B C D E F G H Min. Bolt Circle for Bolt Dia.
Seal Size (Min) (Max) .375 .500 .625 .750
Dimensional Data
(inches)
Figure 2
P-50 F minimum distance
to first obstruction
E
H
1.00 inch Minimum Box Depth
.88
inch
G
D
B
C
A
Shaft & Seal
Size

5
2 P-50 Installation
Note: No seal setting measurements are needed to install the P-50
seal. Instructions are for vertically split case end-suction ANSI pumps.
Modications of the procedure may be required for other style pumps.
Consult Flowserve.
2.1 Tools needed for installation:
• An open end wrench for the gland bolt nuts
• 1/8" Allen wrench (provided)
• 3/32" Allen wrench (provided)
• 3/16" Allen wrench (provided) for sizes> 2.250 inch
2.2 Lubricate the shaft or
sleeve lightly with silicone
lubricant.
2.3 Install the complete P-50
cartridge assembly onto the
shaft or sleeve with the set-
ting devices near the bear-
ing housing. See Figure 3.
2.4 Install the pump back
plate (seal chamber) and
bolt it in place on the bear-
ing frame. See Figure 4.
Figure 3
Figure 4

6
2.5 Position the P-50 with the gland tight against the seal chamber
face. Turn the gland so that the ush tap is as close to the 12:00
o'clock position as possible and so that the ush piping will clear
the bearing frame. Tighten the gland nuts evenly in a diagonal
sequence. Do not overtighten the gland nuts, as this can warp
seal parts and cause leakage.
2.6 Assemble the pump. Avoid pipe strain. Align coupling properly.
2.7 With the impeller, shaft,
coupling, and bearings
in their nal operating
positions, tighten the
P-50 set screws.
See Figure 5.
2.8 Remove the setting
devices from the drive
collar. See Figure 6. Save
the setting devices for future
use when the pump impeller
is reset or when the seal is
removed for repairs.
2.9 Turn the shaft by hand
to ensure unobstructed
operation.
2.10 See Operational
Recommendations
before start-up.
Figure 5
Figure 6

7
3 Operational Recommendations
3.1 Install an adequate seal ush system. The P-50 requires a clean
cool environment for maximum seal life. With a clean cool product
use a bypass ush from the pump discharge (plan 13). With clean
hot product, use a bypass ush through a cooler (plan 21). With
abrasive products or products that are incompatible with the seal,
use a ush from a clean external source (plan 32).
Note: All piping plan designations used in these instructions are from
API 682. For the corresponding ASME B73 piping plan designation,
please add a 73 in front of the referenced piping plan.
3.2 Remove lock outs on pump and valves.
3.3 Do not start up the equipment dry to check motor rotation, etc.
Open valves to ood pump with product uid. Ensure that the seal
ush system is operating. Vent air from the casing of the pump and
the seal chamber before startup.
3.4 Observe the start-up. If the seal runs hot or squeals, check the
seal ush system. Do not allow the equipment to run for any
extended time if the seal gets hot or squeals.
4 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 certicate 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.

8
4.1 Repair Procedures
4.1.1 These instructions are to be used in conjunction with the P-50
Repair Kit. The Repair Kit contains replacement seal faces, sec-
ondary seals, and other special hardware. The parts are identied
in Figure 7. The repair should be done in a clean, well lit area. The
tools you will need to do the repair include:
• Alcohol
• Paper towels or cloths
• Small screw driver
• 1/8" Allen wrench (provided)
• 3/32" Allen wrench (provided)
• 3/16" Allen wrench (provided) for sizes> 2.250 inch
Stator Rotor
O-rings
Set Screws
Centering
Tabs
Retaining Ring
Gasket
O-ring
Springs
O-ring
Half Dog
Set Screws
For special problems encountered during the repair procedure,
contact your nearest Flowserve Sales and Service Representative.
Figure 7
Figure 8
4.2 Disassembly
4.2.1 Replace the centering tabs on the
sleeve collar before removal of the
gland bolt nuts.
4.2.2 Remove the seal from the pump.
4.2.3 Remove and discard the centering
tabs and set screws.
4.2.4 Remove the sleeve collar.
4.2.5 Turn the assembly "gasket side up"
and lift out he sleeve and rotor.
See Figure 8.

9
4.2.6 Remove the rotor retaining
ring from the sleeve and re-
move the rotor from the sleeve.
4.2.7 Remove the O-rings from the
sleeve and discard. Be careful
not to mar the sleeve.
4.2.8 Pull the stator from the gland
ring bore and remove and dis-
card the springs. See Figure 9.
4.2.9 Remove the stator mounting
O-ring and face gasket, from
the gland and discard.
Note: Parts which should be discarded include the O-rings, gasket,
springs, centering tabs and centering tab cap screws and set screws.
Parts which may be reused if in satisfactory condition include the sleeve,
gland and sleeve collar.
Parts which may be reconditioned by an authorized Flowserve repair
facility include the rotor and stator.
Figure 10
4.3 Re-assembly
4.3.1 Install new set screws into the
collar. Be careful to locate the
cup point and half dog point set
screws in the proper holes.
See Figure 10.
Figure 9

10
4.3.2 Coat all sleeve O-rings with
silicone lubricant and install
them onto the sleeve. See
Figure 11.
Note: Earlier versions of the P-50
utilized a different pin drive design
which does not require O-ring. If the
pin in the sleeve is not grooved for an
O-ring, the O-ring will not be used.
Note: If Duraon encapsulated
O-rings are to be installed, contact
your local Flowserve repair facility for
proper installation.
4.3.3 Install the rotor onto the sleeve
aligning the drive slot with the
pin. See Figure 12.
4.3.4 Install the rotor retaining ring.
Be careful not to nick, scratch or
damage the rotor face.
4.3.5 Place the sleeve/rotor assem-
bly rotor face up and clean the
face with alcohol.
See Figure 13.
4.3.6 Install new springs into the
stator, clean the stator face
with alcohol and place it down
onto the rotor. Be sure the
springs are placed in the proper
(deeper) holes. See Figure 14.
Figure 12
Figure 13
Figure 11
Figure 14

11
4.3.7 Coat the stator O-ring with
silicone lubricant and install it
into the gland ring groove.
4.3.8 Place the gland ring over
the stator being careful to
engage the anti-rotation pins.
See Figure 15.
4.3.9 Install the sleeve collar onto
the sleeve and align the set
screws with the holes.
See Figure 16.
4.3.10 Engage all set screws into
the holes. Back off the dog
point set screws by one quar-
ter turn after bottoming.
4.3.11 Install the centering tabs by
pressing the gland ring down
to compress the springs. Lo-
cate the tab lips into the gap
between the gland and sleeve
collar. See Figure 17.
4.3.12 Apply a light coating of
silicone lubricant to one side
of the gland face gasket to
help the gasket adhere to the
gland.
4.3.13 Rotate the sleeve by hand to
ensure freedom of movement
of the rotating parts.
4.3.14 The P-50 is now ready for
installation. Follow the pro-
cedures in Section 2 of these
instructions for proper installa-
tion.
Figure 15
Figure 16
Figure 17

TO REORDER REFER TO
B/M #
F.O.
FIS112eng REV 09/2018 Printed in USA
flowserve.com
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.
© Flowserve Corporation (2013)
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