7
rotates are selected to produce minimum axial thrust loads on the anti-friction ball bearings (7)
under the conditions of operation that are "normal" for the application.
GLH8L-400 Mod Kit (3268/1000M) and GLH8L-462 Mod Kit (3269/1000M)
Note: Not every previous designed 8L-400/462 can be converted to the GLH8L-
400/462. Please contact IMO for additional details.
Note: Although the converted pump will be annotated as a GLH8L the outline maybe
slightly different due to the inlet head design. Please contact IMO for additional details
The Mod Kit includes the following design changes:
•
Bearing spacers - to compensate for additional axial clearances
•
Oil Balance tubes - to provide discharge pressure (via housing port) to the GLH thrust
plate (design enhancement to remove gun drilled idlers)
•
End cover – provides additional clearance in order to convert from the thrust cage
design to the thrust plate design.
WARNING
When a unit is purchased, if no inlet conditions are specified, the power rotor will be provided
with standard balance. If a unit with standard balance is installed on an operation with high inlet
pressure, both the ball bearings (7) and the mechanical seal (51) may be overloaded. If the unit
has been fitted to operate with high inlet pressure, operation on low inlet pressure can
overload the ball bearings. Do not change inlet pressure radically without approval from Imo
Pump Division.
Ball Bearing
The GLH8L-400 and GLH8L-462 series pumps are equipped with a standard width size 16
Conrad ball bearing.
Mechanical Seals
The GLH8L-400 and GLH8L-462 series pumps are equipped with a positive drive
mechanical seal. This is a balanced mechanical seal with a tungsten carbide rotating
face and a tungsten carbide stationary face (seal type/material is identified in the pump
nomenclature). Refer to mechanical seal drawing, figure 3, for construction.
When ordering new mechanical seals, it is important that the pump designator and/or serial
number be given. When pump designator and/or serial number cannot be ascertained,
operating conditions should be listed so that proper mechanical seal can be supplied.
Summary of Contents for CIRCOR GLH8L-400 Series
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