Flowserve Dual Gas Barrier Seals - Manual (Page 6)

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! The mechanical seal can in principle be transported with suitable means like
lifting accessories
.
5. Equipment Check
! 5.1 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 files for hazardous material regulations.
5.2 Disassemble pump in accordance with equipment manufacturer’s instruc-
tions and remove existing mechanical seal and gland or compression pack-
ing and packing gland (follower flange).
! 5. Check seal documentation for seal design and materials of construction.
Verify that the seal is designed for the equipment being repaired.
! 5.4 Check seal assembly drawing for any modifications required to the equip-
ment before installation and act accordingly.
! 5.5 Check shaft or pump sleeve OD, seal chamber depth, seal chamber bore,
distance to the first obstruction, gland pilot and gland bolting to ensure
they are dimensionally within the tolerances shown on the seal assembly
drawing. Dual gas seal configurations are designed for both standard bore
and enlarged bore seal chambers.
! 5.6 Check gland bolting to ensure that bolt diameter and bolt circle conform to
the dimensions shown in the assembly drawing.
! 5.7 Check backplate 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.
! 5.8 Check rotation direction of the equipment. Uni-directional seal designs
must be operated only in the direction shown on the seal gland.
! 5.9 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