Power Spray Rig Filtration - Straining for Results

Posted by Andrew Greess on Aug 17, 2007

I estimate that 50% of the power spray rig repairs we make for our customers are avoidable, and the majority of those are caused by filtration problems. Here are my thoughts on filtration; I would like to hear yours.

Filtration is a critical consideration in power sprayer design, but often gets little consideration.

Most spray rigs have one filter (aka line strainer), which is placed between the tank and the pump. The objective is to remove debris before it enters the pump and causes damage.

Some things to consider:

The filter should be plumbed so that it can be checked often. It must be easily accessible to the tech. If the tech cannot easily check it, it won't get checked, regardless of company procedures. Use filters that are easy to open and check (we recommend Hypro, Spraying Systems, Banjo, etc.) Also, if the tank is plumbed at the bottom, be sure to install a valve before the filter so you can check the filter even when the tank if full. If the tech doesn't check (and clean) the filter frequently, the pump will be starved for water and damage will occur.

Be sure you select the correct mesh strainer. Too coarse means debris in the pump and clogged guns. Too fine means clogged filter and starved pump.

If you work in an area with really bad water, you may need additional filtration. Some ideas:

Filter on the tank fill - This helps prevent debris from getting into the tank.

Filter basket in the tank - This helps prevent debris from getting into the tank. Downside - Techs remove the baskets and lose them.

Dual In-Line Filters - Place two filters between tank and pump. The first is very course to trap large debris, the second is fine to catch the small stuff.

Most importantly - develop your Company policies and procedures to require technicians to check filters on some periodic basis. Do spot checks of filters and be sure the techs see you checking the filters. This one point will mean money in your pocket thru lower repair bills and less downtime.

Gate Valve & Easily Accessible Filter

Dual filters: first coarse, then fine