Your scenario works only in a perfect world. After 3 months in service, you may find out that the gap between flanges became wider or closer than you think. If you have a elbow close by, 6 mm on a 12" line may not be an issue.
Idealy, you should plan to replace the screen with a spacer.
Replacing a start up screen depends on the quality of fluid and construction. You should periodically monitor pressure drop across the screen. We typically remove the screen after 6 months of continous flow.
On a project I completed last year, the screen stopped up after only 24 hour of service due to failure of the pipeline's intenal FBE lining.
This is just my humble opinion.
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>
>
>
> Hello everybody
> Temporary strainers are specified on piping
> connected to pumps and compressors during
> commissioning.They are placed between two flanges,
> so there is a gasket specified on both sides of the
> strainer.If the thickness of the strainer plate is
> 't' mm , then the total space between the two
> flanges is (6 + t )mm .(taking gasket thickness =
> 3mm ).The same is reflected on the isometrics.
>
> Now , after commissioning , when this strainer is
> removed , how is the gap created by removal of the
> strainer ( 3+t )mm compensated for ?
>
> Is a spacer ring of thickness 't' installed in
> place of the strainer.? If this is not the case ,
> then strain is being imposed on the equipment nozzle
> for which there is no accounting during stress
> analysis.
>
> Regards,
>
>
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>
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