with a discharge pipe (D2) having 4 22mm elbows and a length of
7m from the tundish to the point of discharge.
The maximum resistance allowed for a straight length of 22mm
copper discharge pipe (D2) from a ”diameter temperature relief
valve is: 9.0m.
Subtract the resistance for 4 No 22mm elbows at 0.8m each =
3.2m.
Therefore, the maximum permitted length equates to: 5.8m.
5.8m is less than the actual length of 7m, therefore, calculate the
next largest size.
Maximum resistance allowed for a straight length of 28mm pipe
(D2) from a ”diameter temperature relief valve equates to: 18m.
Subtract the resistance for 4 No 28mm elbows at 1.0 each = 4m.
Therefore the maximum permitted length equates to 14m.
As the actual length is 7m, a 28mm diameter copper pipe will be
satisfactory.
5. ELECTRICAL INSTALLATION
WARNING!
THIS EQUIPMENT MUST BE EARTHED.
All electrical wiring must be carried out by a competent person
and in accordance with the current I.E.E. Wiring Regulations. All
pipework should be earthed!
5.1. The sheathed heating elements
Two parallel 1.2kW 230v 50Hz sheathed heating elements are pre
fitted to the cylinder at the factory. They are wired in accordance
with the instructions given in Figure 4.
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