PREVOST PPS Manuel Technique page 13

GB
TIGHTENING THE NUT OF THE COUPLING
5
Tighten the nut manually as far as possible, then tighten up to the
recommended torque value using the wrench (ref. PPS1 CLE) while
maintening the coupling with the key PPS CLESTD.
Check that the pen mark is no longer showing.
A torque wrench may be used in the square on the PPS1 CLE wrench.
Draw a mark on the nut, body and tube so as to easily see the extent of
tightening and, if necessary, retighten the nut when the network is first
pressurised.
After pressurising, check that the mark is aligned and that no nuts are
not loose.
Final checking: right / wrong
DISASSEMBLY
6
PPS pipes and fittings disassemble in a snap. Simply loosen the nut on the fitting
completely and carefully pull out the pipe
Warning: Before refitting the nut, always check the pipe for
damage. See section 2 for information.
In case of reassembling operation, check position of the lug
For a tighter seal, apply Teflon® (Ref: TEFLON 12), Teflon® thread sealant,
oakum or pipe joint compound to pipe threads and tappings.
Moderately tighten with the key to avoid damaging the fitting.
IInstall a compensation system that will absorb pipe expansion or
contraction, to be calculated at the drawing up.
The client is responsible in case of non respect of the conception rules.
PREVOST stays at your disposal to create or validate your plans.
Before fitting couplings and accessories to the ring main, blow air through
it to remove any burrs inside.
Tube Ø Nm
PPS TUB16 8
PPS TUB20 15
PPS TUB25 21
System PPS ringmains can be pressurised immediately once installed.
PPS TUB32 32
PPS TUB40 32
PPS TUB50 43
PPS TUB63 54
PPS TUB80 55
Immediately replace any defective or uneven sections on the ringmain.
When the gauge registers the test pressure, maintain it for at least 10 minutes (slight
dips are tolerated).
After the first 48 to 96 hours, check all seals and make sure that no nuts have been
loosened after components have been installed. The mark made when tightening the nuts
(section 6) should be aligned.
13
THREAD SEALS
7
EXPANSION OR CONTRACTION CAUSED BY
8
TEMPERATURE FLUCTUATIONS
CLEANING THE RINGMAIN
9
BEFORE PRESSURISING
10
1_ Once the system is installed, check for any anomalies and any signs of impacts,
dents or abrasion. Make sure that all fittings have been correctly connected to
the pipe and that the mark made during installation is no longer visible.
2_ Check all clamp or wall bracket anchoring points.
3_ Pressurise the ringmain in two phases:
• Before reaching the required test pressure, test for leaks and / or faulty
connections first by gradually raising the pressure to 3 bar.
Once all checks and adjustments have been made, maintain the pressure at
3 bar and wait at least 5 minutes before raising it again.
• When pressurising, raise the pressure gradually and continuously (1 bar every
4 to 6 seconds) until the gauge registers half of the test valuee.
PROBLEMS/INCIDENTS
In the event of problems, the customer or fitter must provide the following
information in order to file a claim:
- the operating pressure
- the temperature in the room
- the total meterage and the various sections used
- the description of the incident: when, exactly where, etc.
- pictures of the network,