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Tightness testing
Tightness test of press fittings
In order to check that a press fitting is compressed,
a tightness test must be performed before the final
pressure test.
1. Pressurize the pipe to a test pressure of
3 bar for at least 30 minutes. All joints must
be inspected. The pressure may not drop
during the test period.
NOTE!
This tightness test does not replace the man-
datory pressure and tightness test described
below.
Tap water and heating pipes
1. In pressure and tightness testing of pipes
carrying water, the pipe must be slowly
filled with water up to the test pressure.
The tap water system must be tested using
water of drinking water quality.
2. The pipes must be completely full of water
and must have been air bled. In order to
facilitate bleeding, the pipe should be filled
from its lowest point.
3. The temperature difference between the
current room temperature and the water
temperature may not exceed 10°C.
After pressure and tightness testing of the tap
water system with water, the system should be
operational within seven days or completely
drained of water in order to reduce the risk of
bacterial growth.
Guidance
During tightness testing all joints should be
inspected for "invisible leaks". This inspection
is important because such leaks cannot always
be identified by the manometer on the pressure
equipment.
Assembly instructions | LK PressPex and PressPex Eco
Pressure and tightness testing of plastic pipe
systems and pipe systems involving a mix of
plastic and metal pipes
Step A. Pressurise the system for 30 minutes
1. Pressurise the pipe system to a test pressure
of 1.43 × the calculation pressure for at least
30 minutes. The test pressure must be 14.3
bar for tap water systems and 8.6 bar for
heating systems.
2. The test pressure shall be maintained for 30
minutes.
Step B. A fast reduction of the test pressure
1. After 30 minutes, reduce the test pressure
quickly to 7.5 bar for tap water systems
and 4.5 bar for heating systems.
2. This pressure must be maintained for at
least 90 minutes. The pressure should
normally increase slightly during the test
period. The entire pipe system must be
inspected.
Pressure and tightness testing with air
Pressure and tightness testing with air or another
gas must be performed in accordance with the
requirements of AFS 2006.
Tightness testing with air, low pressure
A method developed by VVS Företagen (The
Swedish Association of Plumbing and HVAC
Contractors) and Säker Vatten AB
If there is a risk for freezing or bacterial growth
before a piping system is put into operation, it
is impractical to perform the tightness test with
water. Industry Regulations Säker Vatteninstal-
lation displays on its website www.sakervatten.
se how a simplified tightness test with air can be
performed.
NOTE!
This method may under no circumstances be
carried out with a higher test pressure than
1.1 bar and it does NOT replace the manda-
tory tightness test.
EN.29.C.32.2022-03-14
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