Page 5 - VESBO PPR PRODUCT DATA SHEET

Preparation for Fitting & Testing the System Note: if leakage is detected, rectify the leakage area and repeat the
procedure. If pressure drops by more than 0.2 bar within this period,
1. For pressure testing, pressure gauges that allow reading of changes in leakage must have occurred. Detect, rectify and repeat procedure.
pressure of 0.1 bar shall be used, fitted at the lowest possible point in the
system. Step 4
Pressure test is successful when all the above are met and readings
2. Pressure testing for leakages must be conducted while pipe works are recorded.
still accessible and before concealing or plastering.
2.14 Installation Tip and Techniques
3. Finished pipe work must be completely fitted with filtered water and
vented. 1. To reduce the diameter of a pipeline, i.e., joining a larger pipe to a smaller
one, a socket must be used in conjunction with a reducer. For example, to
Test Procedure reduce a pipe diameter from 50 mm to 25 mm, a 50 mm socket must first
be attached to the 50 mm pipe, followed by a 50/25 mm reducer and finally
After the pipe work is filled with water and completely vented to release air the 25 mm pipe.
locks in the system, testing may begin:

2. When using VESBO fittings with metal threaded parts, white Teflon
sealing tapes must be applied adequately to prevent leakage from threads.

3. Over-tightening of fixtures to VESBO fittings with metal parts may cause
damages and leakage problems. Care must be taken to prevent over-
tightening.

4. During fusion welding:
• Fusion parts must be free from sand and particles.
• Welding time and depths must be observed.
•Do not twist and turn pipes and fittings while inserting and detaching from
welding machine.

5. Metal plugs must be used during pressure tests.
Step 1
Produce the test pressure (=permissible working pressure +5 bar), two 6. Pressure test must be conducted BEFORE concealing pipe works.
times within 30 minutes at 10 minute intervals.
7. Install VESBO pipes and fittings according to pressure, temperature and
Note: If there is a pressure drop, restore by hand pump to the required test expansion limitations indicated in VESBO's Technical Catalogue.
pressure after the 10 minute-interval. If leakage is detected, rectify the 8. Do not use pipes that are damaged or cracked at interfaces. Use only
leakage area and repeat the procedure. special pipe cutters to shorten pipes.

Step 2 9. If painting of the installation is required after welding, insulate the VESBO
If no leakage is detected, for the next 30 minutes check if the pressure has pipeline to prevent the passage of chemicals in the paint, which will cause
dropped by more than 0.6 bar and if there are any visible signs of leakage. water contamination through the pipe wall or affect the service life of the
installation. VESBO does not warrant any responsibility regarding
Note: if leakage is detected, rectify the leakage area and repeat the exposures to chemicals and paints. Customers are strictly recommended
procedure. If pressure drops by more than 0.6 bar within this period, to consult our technical department before the design stage of a project.
leakage must have occurred. Detect and rectify.

10. Use only fittings with parallel threads, do not use conical threads and
Step 3 do not tighten too firmly.
If pressure drop is within 0.6 bar and no leakage is detected, continue the
test without restoring the required pressure for the next 120 minutes. During 11. Insulate VESBO exterior installations to prevent excessive heat loss
this time, check if the pressure drop is more than 0.2 bar and no leakage is and to protect against UV radiation.
detected.
12. Before welding commences, it is recommended to cut pipe ends by 4 -
5 cm. Temperatures of welding adaptors should be high enough for welding
process, i.e., 250 - 260°C.

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