Flowserve Uniseal BW Seals User Manual

BW Seals® Uniseal Series

Cartridge metal bellows single and dual seals

Installation

Instructions

Experience In Motion

Description

The Uniseal metal bellows seal series consists of:

Uniseal I - Single seals for standard bore seal chambers
Uniseal I Plus - Single seals for enlarged bore seal chambers
Uniseal II - Dual seal for standard bore seal chambers

Uniseal II Plus - Dual seal for enlarged bore seal chambers

1 Equipment Check

1.1 Follow plant safety regulations prior to equipment disassembly
including, but not limited to, the following:

• 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 pump in accordance with equipment manufacturer’s

instructions and remove sealing arrangement.

1.3 Check seal documentation for seal design and materials of construction.
Verify that the Uniseal is designed for the equipment being repaired.

1.4 Check seal assembly drawing for any modications required to the
equipment before installation and act accordingly.

1.5 Check shaft or pump sleeve OD, seal chamber depth, seal chamber
bore, distance to the rst obstruction, gland pilot and gland bolting
to ensure they are dimensionally within the tolerances shown on the seal

assembly drawing. Check gland bolt length to ensure adequate thread

engagement for the actual seal gland.

1.6 Thoroughly inspect and clean the seal chamber and shaft or pump

sleeve. Inspect for corrosion or any defects. Remove all burrs, cuts, dents
or defects that might damage gaskets or allow a leak path. Replace worn
shaft or pump sleeve. Remove sharp edges from keyways and threads.

1.7 Check equipment requirements as described in Figure 1. Any reading

greater than what is allowed must be brought within specications.

1.8 Handle the Uniseal with care; it is manufactured to precise tolerances.

The seal faces are of special importance and should be kept perfectly

clean at all times.

1.9 Tools needed for installation: An open-end wrench and torque wrench

sized for the gland bolt nuts; a torque wrench for the set screws. All other
tools are provided.

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

Seal Chamber Requirements Figure 1

Face of seal housing to be square to the axis
of the shaft to within 0.013 mm per millimeter
(0.0005 inches) of seal chamber bore FIM and
have a √1.6

Gland pilot can be at either of these
register locations, concentric to within

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) FIM

• Maximum shaft runout at face of seal housing = 0.05 mm (0.002 inch) FIM

• Maximum dynamic shaft deflection at seal housing = 0.05 mm (0.002 inch) FIM

a

a

0.13 mm (0.005 inch) FIM of shaft or sleeve OD

To first obstruction

μm (63 μinch) R finish or better

Shaft or sleeve OD
+0.000 mm (+0.000 inch)

-0.050 mm (-0.002 inch) ANSI

+0.000 mm (+0.000 inch) API 610/682

-0.025 mm (- 0.001 inch) DIN/ISO

a

2 Uniseal Installation

Note: No seal setting measurements are needed to install the seal. Instructions

are for end-suction back pull-out pumps. Modication of these procedures may be
required for other style pumps. Consult Flowserve for installation support.

2.1 Lubricate the shaft or pump sleeve lightly with silicone lubricant unless
otherwise specied.

2.2 Tighten the setting device cap screws to ensure they are tight before
installation.

2.3 Slide the Uniseal cartridge onto the shaft or pump sleeve with the setting

devices toward the bearing housing. See Figure 2.

2.4 Install the seal chamber and bolt it in place on the bearing frame.
See Figure 3.

2.5 Position the Uniseal with the gland tight against the seal chamber.

Bearing Housing

Bearing Frame

Seal
Chamber

Figure 3

Setting Device

Figure 2

3