Fluid Flow

Pipe Fitting Losses

Pressure loss in a pipe due to fittings such as elbows, tees, valves, expanders and reducers based on 3K and 2K method.

Pipe

Pipe Size (inch) Schedule / Thickness

Pipe Roughness, ε

inch

Length, L

m

Elevation, H

m

Fluid

Result

Reference

Pipe Fitting Losses at cheguide.com

90° Elbow

Qty	90° Elbow	K
	Threaded, r/D=1	0.27
	Threaded, Long Radius, r/D=1.5	0.27
	Flanged, Welded, Bend, r/D=1	0.27
	Flanged, Welded, Bend, r/D=2	0.27
	Flanged, Welded, Bend, r/D=4	0.27
	Flanged, Welded, Bend, r/D=6	0.27
	Mitered, 1 Weld, 90°	0.27
	Mitered, 2 Weld, 45°	0.27
	Mitered, 3 Weld, 30°	0.27
	Mitered, 4 Weld, 22.5°	0.27
	Mitered, 5 Weld, 18°	0.27

45° Elbow

Qty	45° Elbow	K
	Standard, r/D=1	0.27
	Long Radius, r/D=1.5	0.27
	Mitered, 1 Weld, 45°	0.27
	Mitered, 2 Weld, 22.5°	0.27

180° Bend

Qty	180° Bend	K
	Threaded, r/D=1	0.27
	Flanged/ Welded, r/D=1	0.27
	Long Radius, r/D=1.5	0.27

Tees

Qty	Tees	K
	Standard, Threaded, r/D=1	0.27
	Long Radius, Threaded, r/D=1.5	0.27
	Standard, Flanged/Welded, r/D=1	0.27
	Stub-in Branch	0.27
	Run Through Threaded, r/D=1	0.27
	Run Through, Flanged/Welded, r/D=1	0.27
	Run Through Stub in Branch	0.27

Valves

Qty	Valves	K
	Angle Valve =45°, β=1	0.27
	Angle Valve =90°, β=1	0.27
	Globe Valve, β=1	0.27
	Plug Valve, Branch Flow	0.27
	Plug Valve, Straight Through	0.27
	Plug Valve, 3-way, Flow Through	0.27
	Gate Valve, β=1	0.27
	Ball Valve, β=1	0.27
	Butterfly Valve	0.27
	Diaphragm Valve, Dam Type	0.27
	Swing Check Valve	0.27
	Lift Check Valve	0.27
	Tilting Disk Check Valve	0.27

Reducer

Qty	Reducer	K
	Square Reduction	0.27
	Tapered Reduction	0.27
	Rounded Pipe Reduction	0.27

Expander

Qty	Expander	K
	Square Expansion	0.27
	Tapered Expansion	0.27
	Rounded Pipe Expansion	0.27

Orifice

Qty	Orifice	K
	Thin Sharp Orifice	0.27
	Thick Orifice	0.27

Pipe Entrances

Qty	Pipe Entrances	K
	Flush/ Square Edged	0.27
	Rounded r/D	0.27
	Inward Projecting	0.27
	Chamfered	0.27

Pipe Exits

Qty	Pipe Exit	K
	Pipe Exit	0.27