PIPE FITTING FRICTION CALCULATION can be （管件摩擦计算）.pdf

PIPE FITTING FRICTION CALCULATION The friction loss for fittings depends on a K factor which can be found in many sources such as the Cameron Hydraulic data book or the Hydraulic Institute Engineering data book, the charts which I reproduce here in Figures 1 and 2. The fittings friction HFF can be calculated based on the following formula where K is a factor based on the type of fitting, v is the velocity in feet/second, g is the acceleration 2 due to gravity (32.17 ft/s ). v2 (ft / s)2 H FF (ft fluid ) K 2 2 ( / ) g ft s For example a 2 ½” inch screwed elbow has a K factor of 0.85 according to Figure 1 and using a velocity of 10 ft/s (this is determined from the flow rate). The fittings friction loss will be: 10 H FF (ft fluid ) 0.85 2 1.3 2 32 .17 Fluide Design Inc., 5764 Monkland avenue, Suite 311, Montreal, Quebec, Canada H4A 1E9 Tel: 514.484.PUMP (7867) Fax: 514.484.2294 E-mail: jchaurette@ Web site: page…2 Figure 1 Pressure head loss K coefficients for fittings (source the Hydraulic Institute Standards book ). page…3 Figure 2 Pressure head loss K coefficients for manual valves and other devices (source the Hydraulic Institute Standards book ).