Instruction Manual Dräger P7-TDX
26
11.1 Testing of drinking water installations using air
The following tests can be selected:
Tightness test
= start of the automatic tightness test
Tightness external pump
= start of the tightness test with extern pump
Stress test up to DN50 0.3 MPa (3 bar)
= start of a stress test at 0.3 MPa (3 bar)
Stress test up to DN100 0.1 MPa (1 bar)
= start of a stress test at 0.1 MPa (1 bar)
11.1.1 Fully automatic tightness test
Up to a pipeline volume of 100 l a test time of 120 minutes is
required for the measurement. The test time must be pro-
longed by 20 minutes per additional 100 liters of pipeline vol-
ume. The duration of the stabilization phase is not specified
and is defined depending on the pressure stability in the
drinking water installation pipeline (2 to 10 min).
The measurement period is automatically calculated depend-
ing on the volume.
Connect measuring device and drinking water installation and start measurement. The
current pressure (P) and the elapsed pump time (t) are shown. After reaching the test
pressure, the stabilization for temperature equalization is automatically started.
The remaining sequence of a tightness test is described in Chapter 13.1. on page 33
11.1.2 Tightness test with external pump
Until the tightness test is started, the function equals the fully automated tightness test
(Chapter 11.1.1 on page 26).
After starting the tightness test and connecting the drinking
water installation pipeline to the measuring device, the pres-
sure in the line must be increased. Connect the external
pump to the drinking water installation pipeline using a valve
and increase the pressure to 155 hPa (mbar). The stabiliza-
tion phase begins using (
OK
). The duration of the stabilization
phase is not specified and is defined depending on the pres-
sure stability in the drinking water installation pipeline (2 to
10 min).
The remaining sequence of a tightness test is described in Chapter 13.1. on page 33
