Welded Straight Strainer
The Saifilter welded straight strainer is a cleanable stainless steel pipeline strainer designed for installation in a straight pipe run. Fluid enters and exits on the same axis, while a removable cylindrical element captures solid particles before they reach downstream equipment.
Reference dimensions are available for DIN sizes DN25 through DN100 and inch sizes 1″ through 4″. Available options include 304 or 316L stainless steel, several surface finishes, and elements within the published 10 to 400 mesh range. Element construction, connections, seals, and operating limits are matched to the application and finalized with the order.
How the Welded Straight Strainer Works
Fluid enters one end of the housing, passes through the cylindrical filter element, and leaves through the opposite connection. Particles larger than the selected opening remain on the element. As debris builds up, the pressure drop increases, signaling that the screen should be inspected and cleaned.
- Inlet and outlet on the same centerline
- Cleanable stainless steel housing
- Removable metal filter element
- Clamp-retained service cover in the illustrated configuration
- Connections, element, seal, and finish selected for the application
If the piping layout calls for an angled service chamber, compare the welded Y-type strainer. An angle-type strainer is designed for a filtration point that also needs a 90-degree change in piping direction.
Inside the Strainer
A clamp-retained end cover provides access to the cylindrical element without opening the pipeline connections. In the disassembled view, the element has a perforated wall and seats against a gasketed service end. Depending on the required retention, the perforated cylinder can provide coarse screening or support a finer filtering layer. Screen rating, seal material, finish, connections, and working limits are specified for the selected configuration.
Welded Straight Strainer Technical Data
| Parameter | Reference Specification |
|---|---|
| Product type | Welded straight pipeline strainer |
| Flow arrangement | Inlet and outlet on the same axis |
| Product-specific reference sizes | DIN DN25-DN100 / Inch 1″-4″ |
| Available material grades | 304 or 316L stainless steel |
| Filtration range | 10-400 mesh; screen construction selected for the application |
| Finish options | Mirror polished, brushed/matte polished, or sandblasted |
| Optional construction | Insulation jacket based on project requirements |
| Project-defined details | Connections, seals, pressure, temperature, and closure configuration |
Specification note: the dimensions below apply to the welded straight strainer reference drawing. Material, finish, mesh, and jacket options are selected to suit the size and service conditions. Connections, seals, and operating limits are recorded on the order drawing.
DIN Reference Dimensions (mm)
| DN | d1 | d2 | L |
|---|---|---|---|
| 25 | 26 | 70 | 386 |
| 32 | 32 | 70 | 386 |
| 40 | 38 | 70 | 472 |
| 50 | 50 | 70 | 472 |
| 65 | 66 | 114.3 | 648 |
| 80 | 81 | 129.0 | 648 |
| 100 | 100 | 139.7 | 798 |
Inch Reference Dimensions (mm)
| Size | d1 | d2 | L |
|---|---|---|---|
| 1″ | 22.1 | 70 | 377 |
| 1-1/2″ | 34.8 | 70 | 462 |
| 2″ | 47.5 | 70 | 637 |
| 2-1/2″ | 60.2 | 114.3 | 637 |
| 3″ | 72.9 | 114.3 | 784 |
| 4″ | 97.4 | 139.7 | 784 |
All dimensions are in millimeters and come from the welded straight strainer data sheet. Final connection details, service clearance, and piping layout follow the order drawing.
Removable Stainless Steel Filter Element
The cylindrical element slides out through the clamped service end, giving operators direct access for inspection and cleaning. The illustrated element has a perforated wall; depending on the required opening, that wall can serve as the screen or support an additional mesh layer.
Element length, seating diameter, end geometry, and flow direction are matched to the housing. Other removable screen formats are available for different housing designs, including industrial filter strainer baskets.
- 304 or 316L stainless steel, depending on element design
- Opening or mesh rating specified with the screen construction
- Perforated support and fine filtering layer defined separately
- Seating and gasket surfaces accessible during maintenance
- Damaged or distorted elements replaced rather than returned to service
Available Element Designs
Element design can be matched to the target particle size, solids loading, cleaning method, and allowable pressure drop. Millimeter openings and mesh counts describe different rating systems and should not be treated as interchangeable. Final dimensions and seating details are matched to the straight housing.
Perforated or Mesh Element
Reference openings are 0.5, 0.8, 1, 1.5, 2, and 3 mm, with 304 or 316L stainless steel listed as material options. A finer stainless steel filter mesh also needs a defined wire diameter and weave pattern.
0.5-3 mm reference openings
Wedge Wire Element
316L wedge wire uses continuous slots to provide a rigid screening surface. The reference filtration range is 0.1-0.5 mm; slot direction, support geometry, and allowable differential pressure are selected for the application.
0.1-0.5 mm reference range
Woven Screen Element
Reference grades are 50, 100, 200, and 300 mesh in 304 or 316L stainless steel. The clear aperture depends on both mesh count and wire diameter.
50-300 mesh reference grades
Installation, Inspection, and Cleaning
Check flow direction and clearance
Install the housing in the specified orientation, with enough room to release the cover and pull out the full element.
Isolate and depressurize the line
Shut down the process, isolate both sides, drain the housing, and verify zero pressure before loosening the clamp.
Inspect the element and seal
Look for blocked openings, damaged mesh, cracked welds, distortion, worn seating surfaces, or chemical attack on the gasket.
Clean and reassemble
Choose a cleaning method that removes the residue without damaging the element, then replace worn parts before returning the line to service.
Where Welded Straight Strainers Are Used
These strainers fit straight pipe runs that need an accessible, cleanable metal screen ahead of sensitive equipment. Potential duties include food and beverage lines, dairy processing, pharmaceutical and fine-chemical service, edible-oil processing, and water treatment. Final selection depends on the fluid, retained solids, temperature, pressure, connections, and cleaning requirements.
Ingredient and Process-Liquid Screening
Remove unwanted solids from transfer lines using product-contact materials, seals, and finishes selected for the process.
Beverage Process Lines
Protect downstream equipment with a screen opening selected around the product and expected solids load.
Dairy Liquid Transfer
Provide accessible screening where routine removal and cleaning of the element are part of the operating plan.
Specified Process Liquids
Configure the materials, finish, seals, connections, documentation, and cleaning method around the project requirements.
Particulate Pre-Screening
Capture suspended debris before downstream equipment using an opening selected for the flow and expected solids load.
Compatible Liquid Service
Screen process liquids after checking viscosity, corrosion compatibility, particle characteristics, and cleaning method.
If the solids load would require frequent manual cleaning, an automatic self-cleaning filter may be a better fit for the process.
What to Specify
Process and Filtration Data
- Fluid name, composition, density and viscosity
- Normal and maximum flow rate
- Operating and design pressure and temperature
- Particle size distribution and expected solids loading
- Required screen opening and acceptable pressure drop
Mechanical and Documentation Data
- Pipe size, connection type and connection standard
- Housing and element material grade
- Gasket material and process compatibility
- Surface finish, installation orientation and service clearance
- Drawing, material certificate or inspection requirements
WHAT DOES “STRAIGHT” MEAN IN A WELDED STRAIGHT STRAINER?
It describes the piping geometry: the inlet and outlet are located on the same axis so the housing installs in a straight pipe run. It does not by itself define the end-connection standard or the internal screen opening.
HOW DOES IT DIFFER FROM ANGLE-TYPE AND Y-TYPE STRAINERS?
A straight strainer keeps both process connections on one centerline. An angle-type strainer accommodates a 90-degree pipe turn, while a welded Y-type strainer places the screen chamber at an angle to the main flow path.
DOES 100 MESH DEFINE AN EXACT MICRON RATING?
No. Wire diameter and weave pattern also affect the clear opening. Select the mesh construction by the particle size the strainer needs to retain, not by mesh count alone.
HOW SHOULD PRESSURE DROP BE EVALUATED?
Clean and loaded pressure drop depend on flow rate, fluid density and viscosity, connection size, element geometry, open area, and retained solids. Because no standard pressure-drop curve is available for this product, the calculation needs the actual operating data.
CAN THE STAINLESS STEEL ELEMENT BE CLEANED AND REUSED?
It is designed as a cleanable metal element, but reuse is acceptable only when the mesh or perforations, support, welds, seating surfaces and gasket remain suitable for service.
WHICH DETAILS MUST BE CONFIRMED BEFORE ORDERING?
Confirm process fluid, flow rate, pressure, temperature, size, connection standard, material, screen opening, gasket, finish, flow direction, dimensions, service clearance and documentation requirements.
Angle-Type Strainer
Industrial Filter Strainer Baskets
Stainless Steel Filter Mesh
Wedge Wire Filter Elements
Stainless Steel Filter Cartridges
Temporary Strainers
Automatic Self Cleaning Filter
Industrial Candle Filter System