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

mm
inch
m
m

Fluid

lb/h
lb/ft³
cP

Result

Reference

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

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

Expander

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

Orifice

inch
inch
Qty Orifice K
Thin Sharp Orifice Thin Sharp Orifice 0.27
Thick Orifice Thick Orifice 0.27

Pipe Entrances

Qty Pipe Entrances K
Flush/ Square Edged Flush Square Edged Pipe Entrances 0.27

Rounded

Rounded Pipe Entrances
0.27
Inward Projecting Inward Projecting (Borda) 0.27
Chamfered Chamfered 0.27

Pipe Exits

Qty Pipe Exit K
Pipe Exit 0.27