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Suction Hose Strainers - Are 6-inch Barrel Strainers All the Same?
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By President Mark Davis
September 7, 2017

As we approach our September 30th research project on suction strainer performance, we take a couple minutes to look at barrel strainers. A simple visual display of barrel strainers on the tailgate of a pick-up truck is a good example of the differences among nine strainers that all fit 6-inch suction hose. While there are a number of variables that effect the performance of a pumper at draft: lift, altitude, water temperature, rated pump capacity, suction inlet used, condition of the pump seals/packing, suction hose size, etc...the strainer selection is pretty darn important!

It is easy to leave out the "strainer" as a variable in the drafting process - when in fact, the choice of strainer - next to lift - might be the biggest impacting decision made in the drafting process. During our travels across the USA and Canada running water supply drills, we have seen large capacity pumpers struggle to achieve flows of 1,000-1,500 gpm all because of the strainer chosen for the end of the suction hose.

We do know that in most cases, a barrel strainer is a high-performing strainer. The problem of course, is making sure that you have one that matches your pumper's ability to pump from draft, not one that matches the compartment size in which to plan to store it.

As far as low-level and floating strainers go, well those are topics for another article.

A 6-inch American LaFrance barrel strainer from the mid-1960s.  A number of factors effect performance - hole size, strainer length, area:diameter ratio, and outlet size.
A 6-inch American LaFrance barrel strainer from the mid-1960s. A number of factors effect performance - hole size, strainer length, area:diameter ratio, and outlet size.
The outlet side of the strainer is important. Just because the strainer fits onto 6-inch suction hose does not mean that the barrel is 6-inches in diameter.
The outlet side of the strainer is important. Just because the strainer fits onto 6-inch suction hose does not mean that the barrel is 6-inches in diameter.
 
Hole size, style, and arrangement are important in the flow performance formula.
Hole size, style, and arrangement are important in the flow performance formula.
Nine barrel strainers...they all fit 6-inch NST suction hose. Will they all have the same flow performance?
Nine barrel strainers...they all fit 6-inch NST suction hose. Will they all have the same flow performance?
 


 

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