6” Polypropylene Offset Basket Strainers for Seawater Intake

Seawater Strainers for an Oil & Gas Service Specialist

An Oil & Gas Service specialist in the Middle East contacted us who needed 4 6” (DN150) Seawater Strainers for pump and pipework protection on board ship. They were currently using 4 Cast Iron Mud Boxes which are strainers designed for a ships seawater inlet, but they had experienced rapid corrosion in tropical seas, and were looking for other solutions quickly. 

Our Glass Fibre Reinforced Polypropylene Suction Strainer 

North Ridge worked with the customer to specify a Glass Fibre Reinforced Polypropylene Suction Strainer which was suitable for the inlet pressure at the intake within the light weight vessel, handling flows up to 245M³H.

The units incorporate an easy to access clear lid enabling operators to perform a quick visual inspection of the inside without process stoppage. The lids are also designed for quick removal meaning should they require maintaining, this can be performed quickly.

The suction and discharge piping is offset within this design enabling higher amounts of media to be captured by the larger surface area of the basket exposed within the liquid, further reducing clogging times.

Factors to Consider When Specifying Strainers

When specifying strainers it is important to ensure the mesh size is not too fine, which would create an excess pressure loss within suction lines likely to cause NPSH issues to pumps fed by the salt water intake. Another issue with filters being too fine is that they quickly become clogged requiring frequent manual cleaning or backwash to clear debris.

The 4 filters were ready within a week for dispatch and supplied with all the necessary test and material certification.

To learn more about their applications, working principle and how they are specified – read our guide.