Conical strainers are designed for 'temporary' or 
short periods of operation, for example during
commissioning and initial start-up periods of new
or reconditioned process lines to remove any coarse
debris such as rags, welding rods, pipe scale, rust etc
accidentally or unavoidably present within the system.

After a nominal period of operation Conical Strainers
are usually replaced with a permanent strainer of
fine filtration. (Y-Type Strainers or Basket Strainers). 

Barton Firtop Engineering Company Limited design
and manufacture four types of temporary strainers : -

 'Witch Hat' Conical Basket Strainer.

 'Top Hat' Conical Basket Strainer.

 Flat Disc, also known as 'Tennis Bat' Strainer.

 'Bath Tub' or 'T'-Type Strainer.