19
Dival SQD-1 - MT 234-E - 02-2020
EN
TROUBLE-SHOOTING
At the end of the operation, reconnect the control head to the downstream pressure take-off
ATTENTION!
N.B.: The intervention tests should be repeated at last every months.
At the end of the slam-shut check, proceed as follows:
1) Make sure the block is on closing-position;
2) Open the inlet block valve V1;
3) Open very slowly the block valve, pulling the compass;
4) Partially open the relief faucet 6 placed on the outlet piping;
5) Check, through pressure gauge 5, that the outlet pressure has the gauging value indicated by the regulator.
If not, it is then necessary to adjust the gauging value, operating on the internal clamp, rotating it clockwise to
increase and anti-clockwise to decrease;
6) Close the relief faucet 6 and check the value of the closure pressure;
7) Using a foaming agent, check the capacity of all the joints placed between block valves V1 and V2;
8) Open very slowly the outlet block valve V2, until the piping gets completely full;
9) It is advisable to check that, activating the block valve manually, the line capacity gets stopped.
6.0 TROUBLE-SHOOTING
The problems of various kinds which could arise over time are highlighted below. They derive from phenomena asso
-
ciated with the conditions of the gas as well, of course, as with the natural ageing and wear of the materials.
It must be remembered hat all operations on the apparatuses must be carried out by highly qualified personnel with
appropriate knowledge of the subject. Tampering with the apparatuses by unsuitable personnel relieves us from all
responsibility of any kind.
You must therefore train your maintenance personnel or avail yourself of the service centres officially authorised by
us
Regulator set-point
(Pds) mbar
Relief Valve
Slam-shut Max
Slam-shut Min
10<Pds≤15
Pds x 1.7
Pds x 2
Slam-shut not available
15<Pds≤19
10 mbar
19<Pds≤24
Pds x 0.56
24<Pds≤35
Pds x 1.55
Pds x 1.77
Pds x 0.57
35<Pds≤40
Pds x 1.7
Pds x 0.6
40<Pds≤70
Pds x 1.4
Pds x 1.52
70<Pds≤80
Pds x 1.3
80<Pds≤100
Pds x 1.4
100<Pds≤300
Setting of on-line apparatuses consisting of regulators SQD-1 + Slam-shut + Relief valves
Tab. 4
