Flowserve Circpac MD User Manual
Experience In Motion
Circpac MD
Split Segmented
Circumferential Gas Seal
Installation
Instructions
1 Equipment Check and Seal Preparation
1.1 Refer to Figure 1 for sleeve/shaft and equipment requirements.
1.2 The equipment sleeve/shaft must be clean and free of any burrs, nicks or scratches.
1.3 Checksealassemblydrawingforspecicequipmentrequirements,reference
dimensions, special instructions, piping connections, and materials of construction.
Figure 1
Seal chamber squareness to the shaft
centerline should be within 0.25 mm per
25 mm shaft diameter (0.010” per 1” shaft
diameter). Seal chamber face surface
nishshouldbe125RMSorbetter.
1.4 Segmented rings have matched joints and must be mated together per the segment
numbering scheme shown in Figure 2 for 3 segment rings. During assembly, keep all
numbers facing the same direction. The polished side is a sealing surface and should
be handled carefully.
Note: Do not use grease or other lubricants on segmented carbon rings, housing,
or shaft.
1.5 Use caution when handling heavy gland ring halves. Maneuver and support large
parts carefully to avoid personal injury and/or damage to segmented rings.
Shaft runout should not exceed 0.10 mm
(0.004”)FIM.Shaftsurfacenishshould
be 16 RMS or better.
Figure 2
Polished Face
2
2
Back Front
Drive Pin
2
2
2 Seal Installation (Split Housing Designs)
Seal components are assembled in the following order: housing gasket (if separate),
bottom housing half, segmented rings, and upper housing half. Housing gasketing, housing
weight support, centering methods, and multiple ring sequencing should be considered
prior to starting.
Figure 3
2.1 The housing gasket may be supplied split
and bonded to the housing halves or as a
solid ring, depending on gasket type. If the
gasket is already bonded to the housing
halves, no extra preparation is necessary.
Otherwise, with a sharp cutting instrument,
carefully cut the gasket tangential to the
gasket ID with a 45° bias in the thickness, as
shown in Figure 3. At the cut joint, bend the
gaskettotaroundtheshaft.Positionthe
gasket near the equipment face.
Figure 4
2.2 The housing half with drive pin slots at the
joint surface is the bottom half of the housing
ringandisinstalledrst.Orientthelower
housing half toward the equipment in the
direction indicated on the seal assembly
drawing or marked on the housing. Support
the lower half of the housing on the
equipment with loosely engaged bolts or
studs such that the gasket area is accessible
and the segmented ring grooves are fully
exposed.
2.3 If the seal is designed with multiple
segmented rings, start at the housing end
that will be obstructed by additional rings.
Complete each ring before starting the next.
2.4 Feed the garter spring into the ring groove
in the lower housing half. Leave an equal
amount of spring hanging out on each side.
Figure 5
3
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