Page 139 - Petroleum Production Engineering, A Computer-Assisted Approach

Guo, Boyun / Computer Assited Petroleum Production Engg 0750682701_chap11 Final Proof page 134 3.1.2007 8:54pm Compositor Name: SJoearun

11/134 EQUIPMENT DESIGN AND SELECTION
11.1 Introduction piston stroke. These are graphically shown in Figs. 11.1
and 11.2. The double-action stroke is used for duplex (two
Crude oil and natural gas are transmitted over short
and long distances mainly through pipelines. Pumps and pistons) pumps. The single-action stroke is used for pumps
compressors are used for providing pressures required for with three or more pistons (e.g., triplex pump). Normally,
the transportation. This chapter presents principles of duplex pumps can handle higher flow rate and triplex
pumps and compressors and techniques that are used for pumps can provide higher pressure.
selecting these equipments. Pipeline design criteria and
fluid flow in pipelines are also discussed. Flow assurance 11.2.1 Triplex Pumps
issues are addressed. The work per stroke for a single piston is expressed as

pD 2
W 1 ¼ P L (ft lbs):
11.2 Pumps 4
Reciprocating piston pumps (also called ‘‘slush pumps’’ or The work per one rotation of crank is
‘‘power pumps’’) are widely used for transporting crude oil pD 2
through pipelines. There are two types of piston strokes: W 2 ¼ P L(1) (ft lbs)=rotation,
the single-action piston stroke and the double-action 4

Figure 11.1 Double-action stroke in a duplex pump.

Figure 11.2 Single-action stroke in a triplex pump.