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

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.

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.

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

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

1.00 inch Minimum Box Depth

.88

inch

Shaft & Seal

Size

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

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

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.

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.

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

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

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