Question 1

What is a duplex strainer and how does it work?

Accepted Answer

A duplex strainer is a pipeline filtration device with two separate filter chambers and a diverter valve. When Chamber A's filter element becomes clogged, the operator switches flow to Chamber B using the diverter valve — allowing continuous filtration without shutting down the process line. The operator can then clean Chamber A while Chamber B is in service. This 'no-downtime' design is critical for chemical plants, refineries, and water treatment facilities where process interruption costs thousands of dollars per minute.

Question 2

What materials are available for industrial strainers?

Accepted Answer

Our standard material is 316L stainless steel (CF8M casting) for all wetted parts — suitable for most chemical, water treatment, and refinery applications. For aggressive media, we offer Hastelloy C276, Alloy 20, Monel 400, Inconel 625, and Titanium Grade 2 construction. All materials come with full EN 10204 3.1 certification. For high-pressure applications above Class 600, we use forged 316L bodies with integral seats.

Question 3

What certifications do PUREFLOW strainers carry?

Accepted Answer

PUREFLOW strainers are manufactured to API 6D pipeline valve standards and PED 2014/68/EU Module H. We hold ISO 9001:2015 quality management certification. For sour service (H2S) applications, our products comply with NACE MR0175/ISO 15156. We also provide ATEX certification for strainers used in potentially explosive atmospheres. Every strainer is hydrostatically tested to 1.5x rated pressure with full test certificates.

Question 4

How do I specify the right strainer for my process?

Accepted Answer

To specify the correct industrial strainer, provide: (1) fluid type and characteristics, (2) flow rate in m3/h or GPM, (3) operating and design pressure, (4) operating temperature, (5) required filtration level in microns, (6) pipe size and flange standard (ANSI/DIN/JIS), (7) any special material requirements. Our engineering team will return a complete technical proposal within 48 hours including 3D models and pressure drop calculations.

Question 5

What is the difference between wedge wire screens and perforated plate strainers?

Accepted Answer

Wedge wire (Vee-wire) screens feature continuous-slot construction with V-shaped profile wires welded to support rods. This design provides up to 60% open area — significantly higher than perforated plates — making them ideal for high-solids streams where clogging is a concern. Perforated plate strainers use punched holes in a flat sheet and are better suited for clean fluid applications with low solids loading. Wedge wire is the standard choice for mining, pulp & paper, and wastewater treatment.

Industrial Strainers & Screens

316L DUPLEX BASKET STRAINER

WEDGE WIRE SCREEN ELEMENT

HIGH PRESSURE Y-STRAINER

AUTOMATIC SELF-CLEANING STRAINER

HASTELLOY C276 STRAINER

SKID-MOUNTED FILTRATION PACKAGE