Worked example
The example below is for a ½”diameter temperature relief valve with a discharge pipe (D2) having 4 No
elbows and a length of 7m from the tundish to the point of discharge.
Maximum resistance allowed for a straight length of Ø22mm copper discharge pipe (D2) from a ½” diameter
temperature relief valve is - 9.0 m.
Subtract the resistance for quantity of 4 Ø22mm elbows at 0.8 m each = 3.2m.
Therefore, the maximum permitted length equates to 5.8m.
5.8m is less than the actual length of 7m, therefore, calculates the next largest size.
Maximum resistance allowed for a straight length of Ø28mm-pipe (D2) from a ½” diameter temperature relief
valve equates to - 18m.
Subtract the resistance for a quantity of 4 Ø28mm elbows at 1.0 each = 4m.
Therefore the maximum permitted length equates to 14m.
As the actual length is 7m, an Ø28mm diameter copper pipe will be satisfactory
16
600 min
A typical discharge pipe arrangement
For illustration purposes only.
Summary of Contents for 3C382B
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