R.P. Adams Poro-Edge™ Automatic Self-Cleaning Strainers

Procint and their fabricator R.P. Adams can supply you with automatic backwash filters for the following industries and media:

Industries served:
- Offshore Oil and Gas Industry
- Chemical and Petro Chemical Industry
- Refineries
- Steel Works and Mills
- Civil Engineering Industry
- Power Plants
- Breweries
- Water Treatment Plants

- All water types, like cooling water, sea water, surface water, etc.
- Emulsions
- Other Liquid Products

The Operating Principle

As raw water enters the unit, it passes through the tubesheet into the ports of the multiple Poro-Edge™ strainer tubes, causing dirt and debris to collect along the length of the tube. The tubes retain any solids while allowing clean water to pass through the slots and into the strained water chamber where it exits via the outlet.

The strainer operates continually with only a 2 PSIG pressure drop until the filter media are seventy five percent (75%) full of dirt

Unlike other strainer designs, the tubesheet is the reason for the 2 PSIG pressure drop, not the filter media.

As the strainer continues to collect the dirt beyond the 75% full condition, the pressure drop begins to increase.

At 4 PSIG, the strainer goes into backwash mode.

During backwashing the stainless steel backwash assembly rotates along the tubesheet. The seal plate forms a pressure tight connection with the tubesheet permitting each tube to be cleaned – one at a time – in consecutive order.

Unlike other designs, the Poro-Edge media of the R.P. Adams Strainer is separated from the backwash mechanism by a substantial metal tube sheet. This prevents the backwash mechanism from coming into contact with the media and damaging the elements caused by large solids becoming lodged between the media and the backwash arm. In the event of the shear key failing, due to very large solids entering the raw water chamber, the large surface area of the Poro-Edge media will permit flow to continue, allowing time to correct the problem before a loss of flow is encountered.

The Advantages

Poro-Edge Media & Full Flow Protection
All R.P. Adams strainers use Poro-Edge media. The Poro-Edge element is made from continuous trapezoidal wire which is welded to axial stringers at every intersection.

This forms a one-piece screen of amazing strength. The cylindrical wedge-wire media provides the largest effective straining area (dirt-holding capacity) of any automatic water strainer, while operating at a lower average pressure loss. The large open area allows greater efficiency by increasing the time between backwashing. In addition, the media is protected from damage by a large metal tubesheet separating the backwash mechanism and the media.

Available in several levels of separation, Poro-Edge media can safely handle differential pressures up to 200 PSIG, collapse or burst. R.P. Adams Automatic Self-Cleaning Strainers have a standard design pressure of 150 PSIG. Higher design pressures, special materials of construction and ASME Code design and stamp are available .

Operating Economics
By design, R.P. Adams Poro-Edge strainers will operate at a clean pressure drop, typically 2 PSIG, until a 75% full condition exists. A lower pressure drop results in power savings and a better ability to handle upset conditions that would blind other strainers.

Space Saving Design for Economical Installation
Available in horizontal or vertical configurations, R.P. Adams Automatic Self-Cleaning Strainers adopt an efficient design which eliminates unnecessary piping and fittings. In addition, the flexibility of the strainer allows the inlet and outlet nozzles to be located in several different positions, including on the same side, if required .

Two-Year Warranty
All R.P. Adams Automatic Self-Cleaning Strainers are backed by a two-year warranty on materials and workmanship.

Element Exchange Program
When the unit has started operation and it becomes clear that the real process data are different from the data at engineering stage, then R.P. Adams will re-design and fabricate new filter elements for free. The only costs that are charged will be the transport costs for exchanging the elements. Note however that this service can only be applied within 2 months after the unit has been put in operation.

While a single basket strainer design may look attractive in capital cost, many customers have discovered that it is more expensive when you consider the TOTAL COST which includes maintenance and operation!