ICEweb has nearly 100 Control, Instrumentation, Fire & Gas, Safety Instrumented Systems core pages and a total of more than 300 pages - It Really is Cool Engineering - By Engineers for Engineers it must be just about the World's first choice for Technical Information.

Whilst every effort is made to ensure technical accuracy of the information supplied on, Keyfleet Pty Ltd and its employees accept no liability for any loss or damage caused by error or omission from the data supplied. Users should make and rely on their own independent inquiries. By accessing the site users accept this condition. Should you note any error/omission or an article offends please do not ignore it, contact the webmaster and we will review, rectify and remove as necessary.

Get seen by the people who use your products!
can be yours

Shutdown and Blowdown Valves - Partial Closing Techniques

For some years now there have been systems available to check and report on the operation of shutdown and blowdown valves by partially closing and validating the results.  

There are various schools of thought on the technique,  and whilst it does not fully validate the integrity of the valve,  the partial closing does give the valve some exercise and monitor such things as break out torque and parameters over the 10-20% operation.  This must improve the chances of operation during a true demand on the system and hence enhance integrity.

Also,  of course,  there usually are trips during operation,  when this occurs a window of opportunity arises to capture all the valve status information across both the opening and closing stokes of the valve.  This is usually achieved by a comparison against the "new footprint" or signature of the valve.  Thus faults will be sensed by Torque changes,  slower speed of operation etc.  Data such as this is captured either by propriety  software or Asset Management Systems.  Hence the software can  predict that the valve is going to fail and schedule in appropriate maintenance at an appropriate moment (rather than have a unplanned and rather expensive shutdown).

ICEweb sponsor Neles has a partial closing system developed,  their web site will be a good source of further information. Click onto Neles Valvguard.