Flowserve Dual Gas Barrier Seals User Manual
Dual Gas Barrier Seals
Experience In Motion
GB-200, GF-200, GX-200,
and BufferPac
Installation
Instructions
1 Equipment Check
To first obstruction
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
μm (63 μinch) R finish or better
a
Gland pilot can be at either of these
register locations, concentric to within
0.13 mm (0.005 inch) FIM of shaft or sleeve OD
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
a
a
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
• 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
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 manufac-
turer's instructions to allow access to seal installation area.
1.3 Remove existing mechanical seal and gland or compression
packing and packing gland (follower ange).
1.4 Check seal chamber to ensure that it is the appropriate design
for the seal you are installing. Dual gas seal congurations are
designed for both standard bore and enlarged bore seal chambers.
Seal Chamber Requirements Figure 1
1.5 Make sure the shaft or sleeve and the seal chamber face
are clean and free of burrs, cuts, dents, or corrosion that might
cause leakage past the sleeve packing or housing O-ring gasket.
Replace worn shaft or sleeve. Remove sharp edges from
keyways and threads.
2
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.
1.6 Check equipment dimensions. They must agree with the
dimensions shown in Figure 1 and the assembly drawing
supplied with the seal. Critical dimensions include shaft or
sleeve OD and the minimum distance to the rst obstruction.
1.7 Check gland bolting to ensure that bolt diameter and bolt
circle conform to the dimensions shown in the assembly drawing.
1.8 Check seal chamber stud length to ensure that they conform
to the dimensions shown in the assembly drawing. Assembly may
require longer studs or use of bolts or cap screws if existing studs
are not long enough.
1.9 Check rotation direction of the equipment. Uni-directional seal
designs must be operated only in the direction shown on the
seal gland.
1.10 Handle the seal with care, it is manufactured to precise
tolerances. The sealing faces of the rotors and stators are
specially nished. Keep the seal faces perfectly clean at all
times. Oil, silicone lubrication, or type of grease should not be
applied to these seal faces.
2 Dual Gas Barrier Seal Installation
Tools needed:
Provided
• Krytox* lubricant for
sleeve O-rings
Not provided
• Open end wrench for
gland nuts
• Allen wrenches for
setting devices and set
screws
• Allen wrenches for
gland cap screws if they
are required in place of
gland nuts or bolts
2.1 Lubricate the shaft or sleeve OD lightly with Krytox lubricant
provided. If bolts or cap screws are required in place of the seal
chamber studs, insert them through the gland bolt holes before
sliding the assembly onto the shaft. Slide the complete seal
cartridge onto the shaft, Figure 2, with the end with the setting
devices toward the bearing housing.
Note: Check for rotation direction requirements on the seal gland or
assembly drawing before continuing.
*Krytox a Registered Trademark of E.I.DuPont
Install Seal Cartridge Figure 2
3
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