Page 275 - Reciprocating Compressors Operation Maintenance

260 Reciprocating Compressors: Operation and Maintenance

Quantity of Material to be Removed When Reboring

«Solid Bore Cylinders
The maximum diameter to which a compressor cylinder can be
rebored is usually limited by the counter bore. Generally, the counter
bores are %" to V" larger than the cylinder bores.
While a cylinder may have sufficient strength to be bored larger
than the counter bore diameter, it may be impractical to do so
because there would be no way to center the heads without major
redesign (see Figure 4-16),

- End of Stroke

Counter \_ Piston \_ Cylinder
Bore Ring Bore
FIGURE 4-16. Cylinder bore and counter bore configurations.

Cylinders with liners
On cylinders with liners, the liners can be honed, but not much
boring can be done. The amount will depend on the liner thickness,
which typically varies from .375" to .750". When replacing a cylin-
der liner, it is important that the cylinder bore is not out of round or
tapered. The OD of the liner requires full support. Unsupported lin-
ers will distort, and the liner bore (ID) will take an out-of-round or
tapered shape.
The cylinder may be rebored to .060" over the original liner diam-
eter. Obviously, the amount removed from the cylinder bore must be
added to the liner OD.