VALICALC · TECHNICAL REFERENCE

Pipe Fitting Loss Reference

Look up scoped fitting K examples, compare quantity-adjusted head loss and equivalent length, then transfer the selected K subtotal to Pump TDH.

SELECT YOUR CONDITIONS

Search within the verified subset. Numeric sizes match complete designations; a nearby size is a candidate, not an exact match.

SELECTED REFERENCE

Long-radius elbow

Single fitting K
0.6
Quantity-adjusted K
0.6
Minor head loss
68.8308 mm
All fields & cell provenance
Equivalent straight length
1,500 mm

v1.2.0 · verified 2026-10-06 · values use the valid conditions shown above

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Long-radius elbow0.6Back to answer ↑

Explore the verified data

9 matching rows · 9 in this subset

Pipe Fitting Loss Reference, metric display
Fitting / conditionSingle fitting KQuantity-adjusted KMinor head lossActions
45° elbow0.40.445.8872 mm
Exit11114.7181 mm
Gate valve, fully open0.20.222.9436 mm
Long-radius elbow0.60.668.8308 mm
Short-radius elbow0.90.9103.2463 mm
Square entrance0.50.557.359 mm
Standard tee, through branch1.81.8206.4925 mm
Standard tee, through run0.60.668.8308 mm
Swing check valve, fully open2.52.5286.7952 mm

45° elbow

Single fitting K
0.4
Quantity-adjusted K
0.4
Minor head loss
45.8872 mm
More dimensions
Equivalent straight length
1,000 mm

Exit

Single fitting K
1
Quantity-adjusted K
1
Minor head loss
114.7181 mm
More dimensions
Equivalent straight length
2,500 mm

Gate valve, fully open

Single fitting K
0.2
Quantity-adjusted K
0.2
Minor head loss
22.9436 mm
More dimensions
Equivalent straight length
500 mm

Long-radius elbow

Single fitting K
0.6
Quantity-adjusted K
0.6
Minor head loss
68.8308 mm
More dimensions
Equivalent straight length
1,500 mm

Short-radius elbow

Single fitting K
0.9
Quantity-adjusted K
0.9
Minor head loss
103.2463 mm
More dimensions
Equivalent straight length
2,250 mm

Square entrance

Single fitting K
0.5
Quantity-adjusted K
0.5
Minor head loss
57.359 mm
More dimensions
Equivalent straight length
1,250 mm

Standard tee, through branch

Single fitting K
1.8
Quantity-adjusted K
1.8
Minor head loss
206.4925 mm
More dimensions
Equivalent straight length
4,500 mm

Standard tee, through run

Single fitting K
0.6
Quantity-adjusted K
0.6
Minor head loss
68.8308 mm
More dimensions
Equivalent straight length
1,500 mm

Swing check valve, fully open

Single fitting K
2.5
Quantity-adjusted K
2.5
Minor head loss
286.7952 mm
More dimensions
Equivalent straight length
6,250 mm

How to use this data

Ksubtotal=nK; h=nKv²/(2g); equivalent straight length Le=nKD/f using Darcy f and D in metres. Different fitting types must be totalled separately.

    CHECK THE METHOD

    Worked example

    Two long-radius elbows with K0.6 each give subtotal 1.2. At 1.5 m/s, loss is about 0.138 m; D50 mm and f0.02 give 3 m equivalent length.

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    ReferencePipe Size & Schedule ChartReferencePipe Roughness ChartReferenceHazen-Williams C-Factor Chart

    Common lookup questions

    Can I use these values as a universal specification?

    Actual fitting geometry, opening and Reynolds number affect K. Applying a subtotal replaces the calculator total K; it does not add automatically. Do not count both K and equivalent length for the same fitting.

    TRACEABLE DATA

    Sources, scope & verification

    Dataset v1.2.0
    Last verified:

    Nine selected EPA EPANET fitting examples. K values are generic examples, not certified product data. Equivalent length is conditional on the entered Darcy f.

    Values are curated product facts or generated scenarios. Paid standards, complete catalogs and source diagrams are not reproduced. A verification date applies to this documented subset.

    EPANET hydraulic input coefficients ↗

    Type B · US EPA · EPANET 2.2; EPA/600/R-20/133, 2020

    Selected government-authored engineering facts; source conditions are retained.

    Full provenance & artifact record
    Source checked
    2026-10-06
    Use basis
    public-domain
    Artifact SHA-256
    No retained source artifact hash; see the stated source and verification record.