Page 238 - 4637

5. The single-acting triplex slush pump has gained
prominence in recent years.
6. In some earlier triplex slush pumps efforts were made to
operate without a charge pump.
7. Atmospheric pressure alone on the back side of the piston
on the suction stroke was enough to expand the conventional
piston sufficiently to obtain an effective seal between piston and
liner.
8. Triplex single-acting slush pumps have lower rating
operating speed rages than duplex double-acting slush pumps of
equal capacity.
9. Routine maintenance of the power end of either duplex or
triplex pumps is minimal except that recommended oil levels
should not be overlooked.
10. Complete removal of abrasives is considered to be a
possible task.

Exercise 2. Insert the appropriate word
1. The power-driven duplex double-action slush pump made
use of the technology that had been developed in the … of the
steam pump.
a) fluid end
b) power end
c) liner
2. An important difference in a crank-driven pump is the
operation cycle of the two pistons which produces essentially a
uniform … throughout the entire stroke.
a) rod velocity
b) piston velocity
c) harmonic motion
3. Piston movement on the outer half of the working stroke is
… than on the first half of than stroke.
a) slower
b) faster

237