Estimation of Equivalent Length (Hydraulic design)

The following is a summary of Estimation of Equivalent Length for hydraulic design

1. Estimation of Equivalent Length

When the piping lay-out is not available, the equivalent length (Le) of the piping will be estimated based on the straight length (Ls) as follows:

-Process Area:    3.0 times Ls
-Common Area:    1.5 times Ls
-Offsite Area:    1.3 times Ls

Note that Ls is the sum of xyz coordinate length.
For large size or high pressure piping, it is recommended to estimate the number of elbows,tees and valves and evaluate the equivalent

length, assuming piping lay-out.

2. Pump suction line

When the piping lay-out is not available, the equivalent length of the pump suction line should be assumed as 50m minimum for process pumps and utility pumps.

3. Expansion loop

For a long and hot service such as steam line, expansion loops which will remarkably increase the equivalent length will be provided, and should be taken into consideration.

a. Equivalent Length

The resistance coefficients (K) for valves and fittings are summarized in Table  in terms of equivalent pipe.  The equivalent length may be applicable for laminar flow.

b.Equivalent Length of Valve and Fittings

Tagged with: Equivalent • Estimation • Hydraulic • Length

Filed under: Engineering

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