Custom Fabricated Duplex Strainers

Eaton Model 950 – Continuous Flow for Special Requirements

Eaton Model 950 duplex strainers are used when cast duplex designs will not meet the application. Special alloys, higher open area ratios, specific differential pressure targets, corrosion allowance, ASME code stamps, or other custom requirements often necessitate a fabricated solution.

 

The Model 950 consists of two fabricated Eaton Model 90 basket strainers modified so the inlet and outlet nozzles are on the same side. The two chambers are connected to common inlet and outlet headers with butterfly valves that control the flow path. One set of valves is closed so flow passes through the active chamber. When cleaning is required, flow is diverted to the clean chamber and the dirty chamber is isolated for safe access.

 

Pipeline connections are typically ANSI flanged but can also be butt-weld or other configurations as needed.

 

Valve Switching Sequence

To avoid interrupting process flow, operate the valves in this order:

1. Open the clean chamber discharge valve
2. Open the clean chamber inlet valve
3. Close the dirty chamber discharge valve
4. Close the dirty chamber inlet valve

 

After venting and draining the isolated chamber, the basket can be safely removed and cleaned.

 

Butterfly valves are the most common choice (single, double, or triple offset). Ball valves can be used when required. Linked 3-way diverting ball valves are possible but uncommon. Actuators can be added to automate the sequence.

 

Larger Model 950 baskets may require an overhead winch or lifting mechanism. For some applications a hinged quick-opening cover can be supplied, eliminating the need for a davit assembly on larger units.

 

If the particle load is continuous and the pipeline is 6" or larger, consider an automatic strainer. In many cases the cost is comparable and the unit provides fully automatic operation without interrupting flow.

 

Use the calculator to approximate clean differential pressure. Select connection size, enter flow rate (GPM), adjust specific gravity and viscosity if needed, then update. Target a clean differential of ≤ 2 PSI. Because these units are custom fabricated, a larger body with reduced flanges can be supplied when a lower clean ΔP is required.

 

Typical engineering and manufacturing lead time is 6–12 weeks, depending on the degree of customization and current shop load.

 

Part numbers and additional details are shown below. Full specifications and the IOM manual are available here:
Eaton Model 950 Fabricated Duplex Strainer Specifications & IOM