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HIGH PERFORMANCE BUTTERFLY VALVE
FIGURE HPA
5
4.3 CLEANING AND TESTING
4.3.1 Clean the pipeline by flushing the system with a
compatible liquid to remove any contaminants
that may be present in order to avoid scratches
being formed on the sealing surfaces by
these contaminants.
4.3.2 While testing the pipeline, ensure that the media
is clean and free from sand, dirt, pebbles, etc. Add
corrosion inhibitors to the testing media to avoid
any internal corrosion of the valve.
4.3.3 Operate the valve once to check for
smooth operation.
4.3.4 If no obvious problems are observed, test
pressure according to applicable standard may
be applied and leak tightness and operability may
be checked.
CAUTION:
The improper alignment of the pipe and
the valve during installation can lead to
unbalanced tightening of the flanges which
may cause excessive stress on the bolts and
lead to leakage. Ensure all nuts, flanges and
cables are properly fastened.
CAUTION:
•
Faulty installation may lead to valve and/or
pipeline damage.
•
Avoid contact with the valve closure
element during cycling.
•
During shell test, the valve shall be in
the partially open position to prevent the
seat from being subjected to the shell
test pressure.
CHECK:
•
Installation of the valve as per the piping drawing.
•
End protectors are not removed during storage and only to be removed before valve installation.
•
General pipe and valve cleanliness.
•
Face to face and/or end to end dimensions.
•
Conformance of piping connectors with relevant standards or norms.
•
Parallelism of piping flanges or piping connectors.
•
Alignment of the bolt holes of the pipe and valve flanges.
•
For availability of enough space for the valve and its accessories and for easy operation.
•
The suitability and efficiency of valve and accessories support.