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seat – сідло
manpower – робоча сила, людські ресурси

Questions

1. Іs the double-acting steam pump in use now?
2. For how many years the triplex plunger pumps have been
used in industry?
3. What is the main difference between double-acting steam
pump and crank-type pump?
4. What are the basic advantages of triplex plunger pump?
5. What are the main modifications that have led to success?
6. What for a centrifugal charge pump was used?
7. How many manufactures are offering a line of triplex
slush pumps?
8. What type of slush pumps (triplex single-acting or duplex
double-acting) has higher rated operating speed ranges?
9. Are the maximum fluid end working pressures included in
the manufacture’s specifications?
10. The fluid end of a slush pump is subjected to abrasive
action, isn’t it?

Exercises

Exercise 1. State whether the statement is true or false
1. The duplex double-acting steam pump is used in drilling
up to now.
2. An important difference in a crank-driven pump is the
operation cycle of the two pistons which are 90° out of phase
rather than 180° as in the steam pump.
3. Even with harmonic motion of the pistons some surges in
discharge volumes would result.
4. In crank-type pumps harmonic motion is achieved due to
some modification in construction.

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