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  [유체역학] 펌프의 NPSH 마진 (Typical NPSH Margins Recommended by ANSI)
  글쓴이 : 스테파노   고유ID : Stefano     날짜 : 19-11-08 18:47     조회 : 31    
원심펌프에서 NPSHa와 NPSHr 간의 여유치와 관련한 참고자료입니다. 
 
           (Ref: ANSI/HI 9.6.1-2012 "Guide Line for NPSH Margin" )
 

Selected NPSH Margins from ANSI/HI 9.6.1-2012

Guideline for NPSH Margin

 

Industry

 

Application

NPSH Margin
(use whichever is the greater value)

Petroleum / hydrocarbon process

Typical, except vertical canned pumps

1.1 ratio or 1.0 m (3.3 ft)

Chemical process

Typical

1.1 to 1.2 ratio or 0.6 m (2.0 ft) to 1.0 m (3.3 ft)

Electric power generation

Circulating / cooling water

1.0 m (3.3 ft)

Boiler feed < 250 kW/stage

1.3 ratio

Water

Typical, stainless steel or aluminum-bronze impeller, < 75 kW/stage

1.1 ratio or 1.5 m (4.9 ft) minimum

Building services

Typical for pumps in open systems (not pressurized)

1.0 ratio up to a 1.1 ratio or
0.6 m (2.0 ft)

General

Often a standard catalog pump

1.1 ratio or 1.0 m (3.3 ft)

 
 

 

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