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  [À¯Ã¼¿ªÇÐ] ÆßÇÁÀÇ NPSH ¸¶Áø (Typical NPSH Margins Recommended by ANSI)
  ±Û¾´ÀÌ : ½ºÅ×Æij렠 °íÀ¯ID : Stefano     ³¯Â¥ : 19-11-08 18:47     Á¶È¸ : 4320    
¿ø½ÉÆßÇÁ¿¡¼­ NPSHa¿Í NPSHr °£ÀÇ ¿©À¯Ä¡¿Í °ü·ÃÇÑ Âü°íÀÚ·áÀÔ´Ï´Ù. 
 
           (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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