Howden Roots RAS Whispair, Installation, Operation & Maintenance Manual

Page: 22 / 33

ILRB-3000 GEA20261
RAS and RAS-J WHISPAIR Blowers
Page 22 of 33
E - Replacing Lip Seals (RAS/RAS WHISPAIR)
1. Check the shafts for a surface finish of 10-16 micro inches (.3 to .4 micrometers) root mean square (RMS) in the seal contact
area. Also ensure that they are in good condition at the bearing locations. Carefully remove any burrs or sharp corners, but do
no attempt to refinish them.
The seals are “Directional, Hydrodynamic,” which means that proper sealing is completely dependent on the direction of the
shaft rotation. In each seal kit, there are:
• (2) Clockwise (CW) “blue coated” seals for inboard seal replacement
• (2) Counter-clockwise (CCW) “red coated” seals for inboard seal replacement
• Reversible (CW/CCW) “green coated” seal for drive shaft seal replacement
• Protective sleeve tool (inboard seals)
• Protective sleeve tool (drive shaft seal)
Warning: For seals to perform properly:
• Use careful handling procedures to avoid damaging the seals during installation. Use the installation sleeves provided in the
kit as described in Operation F below. Seal lips are not very flexible and will tear or become damaged if not installed properly.
• Clean the shaft surface and make sure it is free of scratches with a finish between 10 to 20 RMS.
• Keep the seals on the shipping rings until the time of installation. Otherwise the seal lips will deform over time.
Note: Proper sealing for shafts that have been repaired with a “speedi-sleeve” depends on the quality of the “speedi-sleeve” and
its installation.
2. Finish the assembly as outlined below.
ILRB-3000 GEA20261 RAS and RAS-J WHISPAIR Blowers.pdf 22 03/09/2015 13:21:27