Correct flow direction, accurate pipe alignment and even flange tightening are essential for proper strainer installation. This guide covers the main preparation steps, installation procedures and checks before commissioning.

1. Prepare for Installation

Before starting work, isolate, depressurize and drain the relevant pipeline section. Allow hot equipment to cool before handling.

Unpack the strainer and check that its pressure rating, temperature limits and material compatibility meet the intended service conditions. Inspect the body, flange faces and sealing surfaces for damage, and remove any dirt or debris.

Prepare suitable gaskets, bolts, nuts, specified washers and installation tools. Gaskets and fasteners must match the flange specifications and operating conditions.

2. Check Pipe Alignment and Clearance

Leave sufficient space between the pipe flanges to accommodate the strainer and gaskets at both ends.

Ensure the pipework is properly supported, the centerlines align and the mating flange faces are parallel. Do not force the pipework into position or use flange bolts to correct misalignment, as this can place stress on the assembly.

Provide enough access for future inspection, screen removal and cleaning.

3. Position the Strainer

Place the strainer between the pipe flanges and align the bolt holes.

The flow arrow on the strainer body must point in the same direction as the fluid flow. For the horizontal liquid-service arrangement described here, position the strainer with the cover and drain plug facing downward, subject to the model-specific installation instructions.

4. Fit the Gaskets and Fasteners

Insert a gasket between the strainer flange and the pipe flange at each end. Keep both gaskets centered and correctly seated.

Insert the bolts, fit the specified washers and nuts, and hand-tighten the connections at both ends. Recheck alignment and gasket positioning before final tightening.

5. Tighten Both Flange Connections

Tighten the nuts gradually and evenly in a crosswise sequence, working in stages around each flange.

Use a suitable torque wrench and follow the specified tightening torque for the flange, gasket and fastener combination. Avoid overtightening, including when using hydraulic or pneumatic tools.

Check both connections to confirm that the flanges remain parallel and all fasteners have been tightened as specified.

6. Inspect and Commission

Before introducing pressure, confirm that:

• The flow arrow matches the intended flow direction.

• Both gaskets are correctly positioned.

• Flange fasteners are tightened to the specified torque.

• The cover and drain plug are securely fitted.

• The pipework is supported and free from forced alignment.

Follow the approved system commissioning procedure and inspect the flange connections, cover joint and drain plug for leakage.