10
MT 237 – EN ed.2015 (Rev.A)
4.0
COMMISSIONING
4.1
GENERAL
After the installation, verify that the on/off valves at inlet and outlet, any available bypass, and the relief valve are closed.
Before commissioning, it is recommended to verify that the use conditions do meet the features of the equipment.
Such features are identified by the corresponding symbols on the rating plates present on the equipment itself (fig. 13).
It is recommended to enable the opening and closing valves very slowly. Too fast manoeuvres may damage the device.
EQUIPMENT RATING PLATES
Figure 8: Equipment rating plate
Here below there is the list of the symbols used together with their meaning.
= Compliance with Directive 97/23/EC (PED)
TS
= allowable temperature range within which it is possible to use the valve
FLUID=
type of fluid for which the device was developed
AG
= block tripping accuracy.
PS
= maximum allowable pressure that can be born under safety conditions by the device body structure.
Pumax
= maximum operation pressure at device inlet.
DNi=
type of inlet connection to the device
DNu=
type of outlet connection from the device
Class=
allowable temperature range within which it is possible to use the valve
IS=
type of test performed on the device
Wdo
= overpressure tripping range of the slam-shut valve, which can be obtained by using the various calibration springs listed in the
tables.
Wdso
= overpressure tripping range of the slam-shut valve, which can be obtained by using the calibration spring mounted during final
testing.
Wdu
= underpressure tripping range of the slam-shut valve, which can be obtained by using the various calibration springs listed in the
tables.
Wdsu
= underpressure tripping range of the slam-shut valve, which can be obtained by using the calibration spring mounted during final
testing.
OPSO
= tripping value of the slam-shut valve due to pressure increase
UPSO
= tripping value of the slam-shut valve due to pressure decrease
