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Support => exam support and downloads => Plumbing, Gas fitting and Drainlaying Apprentice Support => Common Exam JUNE 2007 => Topic started by: Plumber on January 23, 2010, 05:03:36 PM

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Title: QUESTION 7
Post by: Plumber on January 23, 2010, 05:03:36 PM

The diagram below shows a water service pipe feeding a tank.

(download exam for image or download image here)

The pressure available from the main is 350kPa.
The service pipe length is 62m and the water requirement at the tank entry is 36 litres/minute.
Using the formula q225L = d5H
where q = discharge in litres per second
d = ID in centimetres
H = head of water in metres
L = length in metres
calculate the internal diameter of the water service pipe from the utility water main to the tank.
Use the conversion 1 metre head = 10kPa.