Project Description

Temporary Strainer

Temporary Strainers have many names. Some examples are conical strainer, cone strainer, witches hat strainer, plate type strainers, and temporary basket strainers.

First, temporary strainers are generally used at the startup of pipelines to filter larger debris and foreign objects that may be present during construction and startup. Furthermore, temporary strainers may be conical or truncated. Hence, flow and media determine the direction of the strainer. In addition, piping systems usually need industrial strainers.

In brief, temporary strainers are mainly used for the start-up of new or revamped piping systems. Therefore, temporary strainers will prevent construction debris from causing damage to downstream equipment. Also, the screen cone is welded around the entire circumference of the flange ring. Thus provides strength and prevents unwanted bypass.

Size: Range in sizes from 1/4” to 60” nominal pipe size as standard.
Open Area: Range in an open area of strainer to the cross-section area of the pipe from 100% to 300% as standard.
Material Thickness: Gauge of strainer material ranges between 22 to 11 depending on hole size.

Temporary Basket Type Strainers

Perforated Plate – Perforated plate is the most used media for basket strainers and is available in perforation sizes 1/32″ to 1/2″ diameter depending on the degree of straining required and size and type of basket. Perforations are generally made on a staggered pattern for maximum open area and strength.

Basket type strainer

Perforation: Perforation hole sizes range from 1/16” to 1/4” as standard.
Type of Material: Materials include carbon steel, various grades of stainless steel, and alloys.
Flange/Facings: Temporary strainer support rings can be made to work with standard flanges, for example, raised face flanges and ring-type joint flanges.
Welding: Resistance welding, TIG, and Oxyacetylene.
Liners/Covers: Available for small particle removal 200 through 10 mesh carbon steel; stainless steel, etc.
Straight Flow – Mesh on inside.
Reverse Flow – Mesh on the outside.

Cone Type Strainer

Conical strainer

Ordering Information.

Example: Include full description.

4” Temporary Cone Strainer, Stainless Steel, ASME Class 150, 150% Open Area and 1/8” Perf. Screen.

Cone Strainer Size

In general, when ordering, specify:

  • First and foremost, temporary strainer size.
  • Second, tell us the pipe size.
  • Then let us know the pressure rating/flange rating.
  • Subsequently, tell us the perforation or mesh size and material.
  • Know the style – Cone, Basket, etc.
  • In addition to the direction of flow – straight or reverse.
  • Lastly, the percentage of open area or length that you need.

Plate Type Strainer

Plate-type strainers involve a flat plane of mesh that stretches perpendicular to the system’s flow.

Plate type strainer

Conical Strainers

Conical strainers are in the shape of a cone. Hence why they are called cone strainers. A temporary conical strainer is a perforated device of perforated or woven mesh to catch particles in a pipeline. Furthermore, Dannenbaum LLC can help with temporary conical strainers.

However, these are usually temporary and put in pipelines to protect equipment from debris and particles. Also, temporary conical strainers are shaped like a cone or witch’s hat.

Moreover, a conical strainer can catch particles down to .001 inches in diameter. In addition, cone strainers have a slight pressure drop and can be removed after startup, and the debris is evacuated.

And the sizing of Conical strainers is essential to ensure the strainer screen can block particles that could damage equipment.

Cone Strainers

Finally, most industrial strainers suppliers will recommend that all new piping systems have temporary strainers. These are removable strainers with a large mesh installed at the beginning of a new pipeline. This is to help the pipe system from startup.

Removing dirt and other impurities during production is essential. Therefore, the strainer is very important for the natural gas and oil filtering process. The strainers used in this industry are mainly made of materials such as copper and aluminum because they are resistant to corrosion. Therefore, a strainer in the piping system means a cleaner product, protection of equipment, and simple separation of solids from liquids.

The temporary strainer removes seeable items from what is being produced. As a result, small liquid waste can pass through.  When the amount of material to be removed from the stream is relatively small, you can use a filter. The filter is cleaned manually by turning off the drain and removing the filter cap.

By installing a strainer, a marked improvement in chemical operation and a guarantee of a longer equipment life are possible. In addition, industrial and municipal water strainers remove impurities from lakes, rivers, and wells that can damage or clog equipment.

Temporary basket strainers also remove leaves, insects, feathers, etc. From the cooling tower water where the system is open to the atmosphere. Whiches hats remove unwanted material from the water for desalination equipment before being treated to remove the salt. A strainer is a device for mechanically removing unwanted solids from a liquid, gas, or vapor conduit through perforated strain elements or wire mesh.

Temporary Basket Strainers

The temporary basket strainer can remove unwanted material from a piping system.

Clumps of debris can damage expensive products. However, this can be avoided when using the temporary type strainer.

Temporary basket strainers can be essential in dealing with seawater. For smaller type lines, filters are used for cooling lines, fire control lines, sanitation lines, and general cleaning lines. Filters also clean the fuel, hydraulic, and lubrication systems.

Cooling towers and boilers often use conical strainers in the piping system.

Witches Hat Strainers

Witches hats, also called conical Strainers, are used in many applications to protect downstream process system components in many industries—for example, chemical processing, petroleum, power generation, and marine and water treatment. In addition, conical strainers are used in LNG on startups.

If a conical strainer is used in a steam system, large amounts of condensate may form. As a result, you can install steam traps to remove condensate. The second strainer is placed parallel to the primary strainer, and you can deflect flow through the two strainers.

This makes cleaning the filter unit easier while the system is still operating, reducing downtime for maintenance. The large Strainer surface offers a long service life along with minimum pressure drop. The flow coming from the inside to the outside provides maximum strength.

A standard conical strainer is used as a start-up. They protect pump valves and control systems. In a continuous production process, they serve to ensure long-lasting plant protection.

In addition, the Conical Strainer is a highly cost-effective solution.

You must install strainers upstream of each steam trap, flow meter, and control valve.

The Temporary Strainer is designed in the form of a conical filter.

We recommend using temporary strainers in start-up applications.

By installing a temporary pipeline strainer in front of expensive process equipment, they protect against damage from scale, dirt, or by-products, preventing costly downtime. In addition, pipe strainers keep the flow meter and spray nozzle from clogging.

You can use a temporary strainer to capture solid particles and other materials through the system. In addition, conical strainers can help stop damage to the piping system.

Fabricated Temporary Strainers

We officer fabricated temporary pipeline strainers in cone or witches hat strainers, basket, or plate strainers. Fabricated temporary strainers are designed for initial start-up. They should not be used as a permanent straining solution in place of y-strainers, basket strainers, tee strainers, or duplex basket strainers.

Temporary witches hats and temporary basket strainers, and plate-type strainers are solid to help during start-up. Temporary cone or temporary basket strainers can be fabricated to any length in many different types of metals. However, standard lengths are 100% or 150%. This refers to the open area of the cone or basket to the cross-section of the inlet pipe.

Would you mind sending an RFQ? We want to show you lower prices.


Process Industry
Water and Wastewater
Power Industry
Pulp and Paper
Chemical Industry
Oil and Gas
Steel Mills
Metals and Mining
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Cone, basket & plate strainers
100% to 300% open area range (OAR) as standard
Custom engineered designs available

Stainless Steel
Carbon Steel
Other Alloys upon request

Wafer Flat Faced
Raised Face
RTJ Flanged

3/4″ (20mm) up to 24″ (600mm) as standard
Larger sizes available upon request