Page 192 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

Pumping of Liquids I65
Table 3-2 and plastic. The lined impellers are of the open or semi-
Approhate Capacity-Head Ranges For open type.
Centrifugal Pumps
casing

The casing may be constructed of a wide variety of met-
Single Stage (H) 600 225 3-1 and 3-2 als, as well as being lined to correspond to the material of
Canned, Sealless 2000 650 3-1X the impeller. Operating pressures go to about 5000 psi for
Canned, Sealless 1000 800 3-1B the forged or cast steel barrel-type designs. However, the
Single Stage (V) >150 250+ 3-3 usual process application is in the 75 psi to 1,000 psi
Double Suction, range, the latter being in light hydrocarbon and similar
Single Stage (H) 15,000 300 3-4 and 3-5 high vapor pressure systems.
Multistage (H) 3,000 5,000 3-6, -7, and -8
Single and Multistage (V) The removal of the casing parts is necessary for access
a. Mixed Flow (l‘) 100,000 75 3-11 to the impeller and often to the packing or seals. Some
b. Axia! Flow (V) 100,000 25 3-10 designs are conveniently arranged to allow dismantling
c. Centrifugal (V) 40Q+ 5,750 3-9, -12, -13 and -14 the casing without remoting the piping connections.
_ _ _ ~ -
~___--~.____~
__.~___~-
There are proposed construction standards being consid-
”Not necessarily at same point.
(H) = Horizontal. ered which will allow easy maintenance of many of the
(V) = Vertical. types now being offered in a non-standard fashion.

STATIONARY

ROTATING FACE
RQTATl FIG
FACE

STUFFING

SEAL

CASING

IMPELLER
SCREW
Figure 3-3. Cross-sectional view of a vertical in-line pump. (By permission, H. Knoll and S. Tinney, “Hydrocarbon Processing,” May 1971, p.
131 and Goulds Bump, Inc. Mechanical seal and seal venting details courtesy Borg-Warner.)