Flowserve Allpac MP User Manual

Allpac MP

Flow Solutions Division

BW Seals
Durametallic Seals
Pacific Wietz Seals
Pac-Seal

Dual-inline, cartridge seal
for multiphase applications

Installation Instructions

Introduction

The Allpac MP is a dual-inline, cartridge seal specifically designed for multiphase twin­screw pumps. Four mechanical seal assemblies are installed on one pump. Each seal is

identical; they are designed to fit in any location on the pump.

1 Equipment Check

1.1 Follow site safety regulations prior to equipment disassembly.

• Lock out motor and valves

• Wear designated personal safety equipment

• Relieve any pressure in the system

• Consult site MSDS files for hazardous material regulations

1.2 Disassemble equipment to allow access to seal installation area.

1.3 Remove all burrs and sharp edges from the shaft or sleeve including sharp edges
of keyways and threads. Replace shaft or sleeve if worn in the sleeve gasket
area. Make sure the seal housing bore and face are clean and free of burrs.

1.4 Check requirements for shaft, sleeve, and seal housing, see Figure 1.

Seal Chamber Requirements

To first obstruction

Face of seal housing to be square to the axis
of the shaft to within .005 inch (0.13 mm) FIM
and have a √63 µ inch (1.6 µm) R
better

Concentric to within .005 inch (0.13mm) FIM

Seal housing bore to have a √125 µ inch
(3.2 µm) Ra finish or better

Scribe
Mark B

Sleeve or shaft finish to be
√32 µ inch (0.8 µm) Ra or better

• Bearings must be in good condition.

• Maximum lateral or axial movement of shaft (end play) = .010 inch (0.25mm) FIM

• Maximum shaft runout at face of seal housing = .003 inch (0.07mm) FIM

• Maximum dynamic shaft deflection at seal housing = .002 inch (0.05mm) FIM

of shaft or sleeve O.D.

Scribe
Mark A

+.000 inch (+.000mm) API 610

Figure 1

finish or

a

1.5 Check assembly drawing included with the cartridge seal for materials of construc-
tion, dimensions, and piping connections.

1.6 Check shaft or sleeve O.D., box bore, and distance to the first obstruction to
ensure that they are dimensionally the same as shown on the seal assembly
drawing.

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.

2

© Copyright 2002 Flowserve Corporation

1.8 Handle all seal parts with care, they are manufactured to precise tolerances. The
contacting surfaces of the rotating and stationary seal faces must be treated with
particular care. These two surfaces are lapped flat to within three helium light bands
(34.8 millionths of an inch). Keep the seal faces perfectly clean at all times.

2 Allpac MP Seal Installation

2.1 Lubricate the shaft or sleeve lightly with silicone lubricant before installing any seal
parts.

2.2 Lubricate the two sleeve gaskets before installing them in their grooves in the sleeves.

2.3 Lubricate the flange gasket before installing onto the pilot diameter on the seal
cartridge.

2.4 Back out the drive collar set screws slightly so that no portion of them extends
inward past the sleeve ID.

2.5 Install the complete cartridge seal assembly on the shaft and position it with the
seal oriented toward the pump. If at any time the seal requires a significant amount of
force to position correctly, STOP, BACK UP, and assess the situation.

2.6 Position the cartridge flange against the seal chamber face and tighten the gland
stud nuts evenly in a star pattern. The nuts can be torqued using ordinary wrenching
techniques.

2.7 Adjust the bearings, coupling and pump rotating assembly so that the shaft is in
its operating axial position. Any subsequent axial adjustment of the shaft requires
resetting of the seal.

2.8 Tighten the drive collar set screws to the value specified on the assembly drawing.
Improper installation torque can damage the screws or shaft or result in lower axial
thrust retention of the drive collar.

2.9 Loosen the setting plate fasteners and slide the setting plates away from the drive
collar and sleeve as far as possible. Tighten the setting plate fasteners so that the
setting plates do not come loose during operation.

3 Barrier System Piping

3.1 Each dual cartridge seal has pipe ports labeled as shown in the assembly drawing.

3.2 The Allpac MP seal is designed to be operated with the seal flush and support systems
as defined on the assembly drawing.

4 Operation

4.1 During the first hour of operation, seal performance should be monitoredvery
closely:

• The temperature rise of the barrier fluid should be steady and should level out

after an hour of operation. A quickly rising temperature or a temperature that does
not seem to be leveling off signals a problem and should be thoroughly investi­gated.

• A sudden rise or decrease in barrier fluid, or a significant color change of barrier

fluid signals off-design leakage and should be thoroughly investigated.

3

• A leakage rate of more than 30 drops per minute of the outboard seal signals off-

design leakage and should be thoroughly investigated.

• Excessive vibration of the pump should be investigated immediately.

5 Repairs

This product is a precision sealing device. The design and dimension tolerances are critical
to seal performance. Only parts supplied by Flowserve shall be used to repair the seal.
These are available from numerous Flowserve stocking locations. To order replacement
parts, refer to the part number, material code and description listed on the assembly
drawing.

Decontaminate the seal assembly and return it to Flowserve with an order marked

“Repair or Replace.” A signed certificate 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 in its original condition.

All Flowserve Corporation, Flow Solutions Division, products must be installed in accordance with Flowserve
installation instructions. Failing to do so or attempting to change or modify Flowserve products will void
Flowserve’s limited warranty. Flowserve’s limited warranty is described fully in Flowserve’s Standard Terms and
Conditions of Sale. Flowserve makes no warranty of merchantability or fitness for a particular purpose and in
no event shall Flowserve be liable for consequential or incidental damages.

Flowserve Corporation Flow Solutions Division

Primary Worldwide Flow Solutions Division Locations Licensees, authorized agents, and affiliated companies located worldwide

United States

Kalamazoo, MI
Phone [phone]
Fax [phone]

Edmonton, Alberta
Phone [phone]
Fax [phone]

Canada

Scarborough, Ontario
Phone [phone]
Fax [phone]

Singapore Japan

Phone [phone]
Fax [phone]

Printed in U.S.A.

Tlaxcala
Phone [phone]
Fax [phone]

Sao Paulo
Phone [phone]
Fax [phone]

Netherlands

Roosendaal
Phone [phone]
Fax [phone]

Osaka
Phone [phone]
Fax [phone]

www.flowserve.com

ISO 9000

Certified

Argentina

Villa Martelli
Phone [phone]
Fax [phone]

GermanyBrazilMexico

Dortmund
Phone [phone]
Fax [phone]

Australia

Marayong NSW
Phone [phone]
Fax [phone]

FIS156

ORG 07/02 USA