The diagram below shows a storage water heater with an uncontrolled energy source.

(Download Exam for Image and table or download image here)

The following table is to be used to size the circulating pipes.

Note: X is the true horizontal distance and Y is the true vertical distance.

Determine each of the following:
(a) the size of the circulating pipes

(b) the height of the vent pipe using the formula H = SP + 1
10
where H = the height of the vent pipe, in metres.
SP = set outlet pressure of the reducing valve, in kilopascals

(c) the pressure on the base of the hot water cylinder

(d) the static pressure in the wetback

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