Reducer K Value Table

These types of pressure drops are highly dependent on the geometry and are not usually covered in simple pressure loss estimation schemes such as a single k value equivalent length etc.

Reducer k value table. ξ minor loss coefficient. Minor or dynamic pressure loss in pipe or tube system components can be expressed as. δp minor loss minor pressure loss pa n m 2 psf lb ft 2. ρ f density of fluid kg m 3 slugs ft 3.

Determine l friction loss in pipe fittings in terms of equivalent length in feet of straight pipe. Fittings such as elbows tees valves and reducers represent a significant component of the pressure loss in most pipe systems. K value for piping reducer expander k factor calculator. Pressure drop in a pipe due to fittings such as elbows tees valves expanders and reducers based on 3k and 2k method.

Select the appropriate k value for such and select d and f for schedule 40 pipe from the table below where k is the pipe diameter in feet. This article provides methods to calculate the k value resistance coefficient for determining the pressure loss cause by changes in the area of a fluid flow path. δp minor loss ξ ρ f v 2 2 1. Assume a 6 angle valve for schedule 40 pipe size.

V flow velocity m s ft s. In pre project common values are often sufficient. Usual coefficients are given in the tables below. This coefficient must be determined for every fitting.

K values for different fittings type of fitting value of k sudden contractions 0 3 0 5 entrance shape well rounded 0 5 elbow 900 0 5 1 0 450 0 4 0 75 220 0 25 0 50 tee 900 take off 1 5 straight run 0 3. Checalc chemical engineering calculations to assist process plant operation and maintenance engineers. Pipe size inches sch. Later editions give the equation for sudden contractions in chapter 2 derived by using an approximation of the weisbach contraction coefficients along with the continuity equation.

The tp 409 1942 presented a table of k values for different area ratios. The early editions of the tp 410 1957 1982 used a graph of k values for different area ratios. For quick calculation of equivalent length and frictional losses across a pipe run approximate k value for reducers and expander joints can be considered to be 0 5. 40 d feet f pipe size inches.

This article details the calculation of pressure losses through pipe fittings and some minor equipment using the k value method also known as the resistance coefficient velocity head excess head or crane method.