Page 152 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

The City & Guilds Textbook: Plumbing Book 1

1

Y
2

3

X
0
0 10 20 30 40 50 60
Key
1 Pumping X Time (minutes)
2 Test pressure 1.5 times maximum working pressure Y Pressure
3 0.5 times maximum working pressure

p Figure 2.61 Pressure test A chart
● Test type B: slowly fill the system with water, pump the system up to the
required pressure and maintain the pressure for a period of 30 minutes.
Note the pressure after this time. The test should continue without
further pumping. Check the pressure after a further 30 minutes. If the
pressure loss is less than 60 kPa (or 0.6 bar), the system has no visible
leakage. Visually check for leakage for a further 120 minutes. The test is
successful if the pressure loss is less than 20 kPa (0.2 bar).
1
Y 2
3 4

X
0
0 10 20 30 60 120 180
Key
1 Pumping X Time (minutes)
2 Pressure drop < 60 kPa (0.6bar) Y Pressure
3 Test pressure
4 Pressure drop < 20 kPa (0.2bar)
p Figure 2.62 Pressure test B chart
● Above-ground sanitation systems: these should be tested in accordance
with Document H of the Building Regulations. They should be tested to a
pressure of 38 mm water gauge (w/g) for a period of three minutes with no
pressure loss.

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