Marine Diesel Engines by Nigel Calder

Author:Nigel Calder
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2007-04-06T04:00:00+00:00

FIGURE 6-6. Operation of a variable-volume flexible-impeller pump. The housing is flat on the top, which squeezes the impeller blades toward the shaft. As the blades expand, a vacuum is created that draws liquid into the pump body (A). As the impeller rotates, each successive blade draws in liquid and carries it to the outlet port (B). When the blades are compressed, they expel the remainder of the liquid, creating a continuous, uniform flow (C). (Courtesy ITT/Jabsco)

Other common problems are leaking seals (quite likely as a result of running dry; there will be telltale signs of water dribbling out of the weep hole on the base of the pump) and worn or corroded bearings. Apart from normal wear, bearings will be damaged by water from leaking seals, an overtightened belt, and misalignment of drive pulleys or couplings. Optimum belt tension permits the longest stretch of belt to be depressed by 1/3 to ½ inch with moderate finger pressure. Check pulley alignment by removing the belt and placing a rod in the groove of the two pulleys; any misalignment will be clearly visible. Pumps that operate in sandy water will experience a gradual loss of performance due to wear on the pump housing, cover plate, wear plate (if fitted), and impeller.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.