Temporary cone strainers
Pointed start-up strainers with perforated shells and mesh liners.
Product detailsDrawing-based manufacturing
Cone strainers
Pointed cone, truncated cone and flat start-up strainers capture construction debris during pipe flushing and commissioning. We manufacture the perforated support, optional fine-mesh lining and retaining ring as one installation-specific assembly, with the flow direction and removal clearance defined on the drawing.
- Temporary forms
- Cone · truncated · flat
- Media
- Perforated · optional mesh liner
- Fit
- Flanged or union
Metal filtration componentsCone strainer configurations
Compare cone strainers
Pipeline class does not establish the allowable pressure drop across a screen.
| Construction | Application and fit | Confirm first | Find a product |
|---|---|---|---|
| Witch-hat strainers | A temporary screen must project upstream or downstream between flanges. | Line size, cone length, flange OD, flow direction and support. | Filter matching products |
| Truncated cone strainers | Available length or handling favors a flat-ended cone. | Large and small diameters, length, flange and closed-end detail. | Filter matching products |
| Flat start-up screens | The available pipe spool has no axial room for a pointed or truncated cone. | Confirm flange fit, active open area, support and the expected start-up pressure loss. | Filter matching products |
Pointed, truncated and flat startup screens
Choose by flow geometry
Cone strainer configurations
Start with the line size, flange interface and available installation length, then define flow direction and screen support.
01
Witch-hat strainers
Pointed temporary strainers installed between flanges for equipment protection.
View matching products →02
Truncated cone strainers
Flat-ended conical screens where a full point is unnecessary or restricted.
View matching products →
03
Flat start-up screens
Flat perforated or mesh-lined screens for flange joints with no room for a cone.
View matching products →Cone strainers
Find a product
3 products
Truncated cone strainers
Short tapered start-up strainers with defined large and small diameters, end closures and flange seats.
Product details
Flat startup strainers
Flat perforated and mesh-lined start-up strainers with defined active area, support plate, gasket land and identification tab.
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Clear filters
Construction
How a start-up screen is built
- Cone orientationPointing the cone tip upstream or downstream changes the load on the screen. The piping drawing specifies the tip direction, mesh position and support together.
- Backing screenPerforated backing carries flow loads while woven mesh retains finer debris. Mesh lies against the supporting face for the specified flow direction.
- Removal planPlan differential-pressure monitoring, an opening connection and the removal sequence before commissioning. A flat screen occupies a short axial space; the cone provides a larger developed surface within its longer envelope.
- Cone formA pointed cone, truncated cone or flat disc defines the screen envelope. Base diameter, axial length and exposed surface are dimensioned together with the flange retaining ring.
- Retaining ring and screen bodyThe retaining ring seats at the flange joint while the cone projects into the pipe spool. Ring thickness, gasket contact, screen attachment and the identification handle are coordinated so that installation and removal remain accessible.
01Cone orientation
02Backing screen
03Removal plan
04Cone form
05Retaining ring and screen body
Start with the flange joint and available spool length
A start-up strainer occupies two different envelopes: the retaining ring at the flange faces and the screening body inside the pipe. The flange bore establishes the passage; the distance to bends, valves and reducers establishes the permitted projection. Record both envelopes before choosing the cone profile.
A pointed cone uses a long tapered surface. A truncated cone combines two end diameters with a shorter axial envelope. A flat screen keeps the assembly close to the flange plane. For each form, show the gasket contact band, identification handle, support arrangement and the space needed to withdraw the part.
Keep the collection surface supported through start-up
The fine mesh intercepts small debris and the perforated body provides structural backing. Their relative positions follow the drawing flow arrow. Continuous attachment around the ring and the screen edges establishes the collection boundary and prevents debris from passing around the mesh.
Commissioning work also defines the maintenance sequence. Record the clean differential pressure, check the pressure rise as debris accumulates, isolate the line for inspection and remove the screen at the specified commissioning stage. A planned access joint and clear identification make this sequence practical on site.
What we need to size a cone
The screen is sized against the pipe bore and the debris load, not against a nominal micron figure.
Pipe/flange interface
Defines the mounting ring and fit. State the flange bore, seating diameter, ring thickness and gasket contact band.
Cone dimensions and orientation
Controls available area and structural behavior. Give the axial space between nearby fittings as well as the cone base and height.
Aperture or mesh specification
Defines the debris retained. Pair the mesh opening with wire diameter and identify the perforated backing separately.
Flow and differential pressure
Guides support construction. Include clean flow, debris loading and the maximum operating differential pressure.
Service duration and cleaning
Separates temporary from permanent duty. Specify the inspection interval, access joint and the point at which the screen is removed.
Nominal pipe size
DN25 to DN200 and beyond · 1" to 8" and larger. Use the nominal pipe size together with the actual mating dimensions and flange arrangement.
Installation details that control performance and maintenance
| Detail | Dimension or construction | Purpose | Inspection point |
|---|---|---|---|
| Retaining ring | Bore, thickness and gasket band | Locate and clamp the assembly | Seating contact and concentricity |
| Cone envelope | Base diameter, height and tip clearance | Fit the available pipe spool | Projection and withdrawal space |
| Fine mesh and backing | Separate opening and perforation definitions | Combine interception with support | Mesh position and continuous fixing |
| Identification handle | Position, projection and marking | Identify the temporary installation | Clearance from bolts and adjacent parts |
Cone strainers
Applications
These screens are installed for commissioning and removed afterwards, wherever debris would damage downstream equipment.
Pump protection
Intercept weld debris, scale and foreign material during flushing.
Auxiliary liquid circuits
Protect specified equipment circuits during initial circulation.
Plant turnaround
Control debris following pipe modifications.
New pipeline commissioning
Installed between flange faces before first flow to catch weld slag, mill scale and construction residue, then removed.
Pump and compressor protection
Fitted upstream of rotating equipment during start-up so debris cannot reach impellers and clearances.
Inspect the retaining ring and supported screen
The retaining edge transfers load into the pipeline joint.
Ring fit
Measure thickness, bore and gasket contact geometry.
Attachment
Inspect the mesh, backing and retaining-edge joints.
Orientation
Document flow direction and installed position.
Lining boundary
Inspect the full circumference where mesh joins the support or retaining ring. The fastening keeps debris on the intended collection side while the support carries the flow load.
Documented product examples
Temporary cone strainers
Temporary cone strainers catch construction debris during line flushing and commissioning. They are installed at a flange joint or spool and removed after the system reaches its approved clean condition.
Flat startup strainers
Flat start-up strainers place a perforated or mesh-lined screen across a flange opening for short-term equipment protection. They are useful when there is no spool length for a cone.
Cone strainers
Technical resources
Technical guide
Strainer area, pressure drop and maintenance
Compare exposed screening area, pressure rise and cleaning access for the commissioning duty.
Strainer area, pressure drop and maintenance→Technical guide
Perforated open area and structural support
Relate perforation pattern, solid welding margins and support to the usable screening area.
Perforated open area and structural support→How to specify a custom metal filter
Prepare the mating dimensions, flow arrow, support and acceptance information for the drawing.
How to specify a custom metal filter→Cone strainers
Questions before ordering
Can a temporary strainer be used permanently?
Startup screens serve a defined commissioning period. A permanent installation has a separately specified screen area, structural differential-pressure limit, monitoring and cleaning access.
Does Class 150 specify the cone differential-pressure limit?
Class 150 describes the flange pressure–temperature rating. The screen and its support have a separately defined differential-pressure limit based on their own construction.
Which direction should a startup cone face?
The piping drawing fixes whether the tip faces upstream or downstream. The flow arrow, mesh backing position, debris collection side and removal space are defined as one installation.
What does the identification handle do?
The projecting handle identifies the installed temporary screen and provides its orientation or service marking. Its position is coordinated with flange bolts and adjacent equipment so that the screen remains visible and accessible during commissioning.
How are usable area and cone length related?
The conical surface provides screening area within the available pipe length. The exposed perforations, mesh, weld margins and any blocked end region determine usable area. Compare this area with the required flow and debris allowance when choosing pointed, truncated or flat geometry.
Related products and guidance
Technical enquiry
Define the dimensions, media, joints and inspection records before confirming the order.