How to Measure Replacement Filter Plates for an Older Filter Press

Older filter presses often remain mechanically serviceable long after original drawings, spare-part numbers or supplier records have become difficult to find. When a plate eventually needs replacement, buyers may only have the installed component available as a reference.

In this situation, ordering a replacement filter plate should begin with systematic measurement rather than nominal plate size. XUDA manufactures filter plates in multiple structures and can evaluate customized replacements based on drawings, samples and process conditions. XUDA's current product range includes chamber/recessed, membrane, CGR and plate-and-frame designs. 

Why Nominal Plate Size Is Not Enough

Two plates described as “1000 mm” or “1500 mm” may still differ in:

• Thickness

• Chamber depth

• Feed-hole position

• Filtrate outlet arrangement

• Handle geometry

• Sealing design

• Drainage surface

• Material

A replacement should therefore be matched from the complete component.

Replacement Plate Measurement Sheet

Step 1: Select the Best Reference Plate

Do not measure the most damaged plate simply because it has already been removed from the press.

A cracked, warped or heavily worn plate may no longer represent the original dimensions.

Where possible, compare:

• One undamaged installed plate

• A spare unused plate

• Several plates from the same pack

• Any historical drawing or manual

Step 2: Measure Overall Length, Width and Thickness

Record all three dimensions.

Thickness is especially important because small differences accumulate across the plate pack. A replacement that appears to fit individually can still change total pack length if many plates are replaced.

Step 3: Measure Chamber Depth

Chamber depth affects cake volume and should not be confused with total plate thickness.

It also influences the amount of solids held between adjacent plates. Our guide to chamber depth explains why this dimension affects both capacity and cake formation.

Step 4: Map Every Feed Opening

Record:

• Hole diameter

• Distance from plate edges

• Whether the feed is centered or offset

• Opening shape

• Any surrounding sealing geometry

Do not assume that another plate with the same outer dimensions uses the same feed arrangement.

Step 5: Map the Filtrate Outlets

Filtrate ports are equally important, especially in systems where openings align through multiple plates.

Take photographs of both sides of the plate and clearly mark which ports are open, closed or connected to external fittings.

Step 6: Measure Handles and Support Points

Handles determine how the plate sits on the filter press side beams or support structure.

Record:

• Handle width

• Handle height

• Distance from plate centerline

• Contact surface dimensions

• Any rollers or special fittings

An otherwise correct plate may still be unusable if its support geometry does not match the press.

Step 7: Identify the Plate Type

Determine whether the existing component is:

• Chamber/recessed

• Membrane

• CGR/gasketed

• Plate-and-frame

• Another customized design

XUDA currently manufactures these main filter plate categories and supports customized requirements for different filtration processes. 

Step 8: Record the Material and Process Conditions

Dimensions alone cannot determine the correct material.

Provide:

• Slurry composition

• pH

• Operating temperature

• Feed pressure

• Squeeze pressure if applicable

• Cleaning chemicals

• Required cake dryness

XUDA identifies filtration pressure, squeezing pressure, slurry temperature and corrosiveness as application factors used when selecting suitable raw materials.

Step 9: Photograph Both Sides of the Plate

Useful photographs should include:

1. Complete front view

2. Complete rear view

3. Feed opening

4. Filtrate ports

5. Handles

6. Sealing edge

7. Material markings

8. Any damaged areas

Include a scale or measurement reference where possible.

Step 10: Send a Physical Sample When Measurements Are Uncertain

For complex or heavily customized plates, a physical sample can reduce uncertainty that is difficult to resolve from photographs alone.

This is particularly useful for unusual drainage patterns, membrane assemblies, molded sealing geometry or older equipment with no surviving documentation.

Pre-Order Checklist

• Overall dimensions recorded

• Plate thickness confirmed

• Chamber depth measured

• Feed openings mapped

• Filtrate ports mapped

• Handles measured

• Plate type identified

• Material reviewed

• Operating pressure recorded

• Temperature recorded

• Photos supplied

• Sample available if required

FAQ

Can a replacement filter plate be manufactured without the original drawing?

Potentially. A detailed sample, accurate measurements, photographs and operating data can provide the information needed for technical evaluation. Complex designs may require additional verification before production.

Should I send the damaged plate as a sample?

An undamaged plate is preferable. If only a damaged plate is available, identify the damaged areas clearly and provide additional measurements or references so that deformation is not copied into the replacement.

Can I order from the filter press model number alone?

The model number is useful, but older machines may have been modified during their service life. The currently installed plate should also be measured and verified.

What is the most commonly missed measurement?

Plate thickness, feed/filtrate port geometry and handle position are often overlooked when buyers focus only on external length and width.

Build a Replacement Specification Before You Need the Next Plate

Once a compatible replacement has been confirmed, retain the approved drawing, material specification and operating data for future orders. This turns an emergency measurement exercise into a repeatable spare-parts specification.

For additional guidance, see our detailed article on replacement plate matching.

XUDA Filtration supplies standard and customized filter plates for filter press manufacturers and industrial end users. If an older filter press no longer has complete spare-part documentation, contact XUDA with photographs, measurements, samples and operating conditions for technical review.