Overflow Weir/Drain for Stainless Steel Washing Tanks

Product Specifications

Technical details and manufacturing context for Overflow Weir/Drain

Definition

The Overflow Weir/Drain is an integrated component designed for stainless steel washing tanks used in food manufacturing. It combines two essential functions: an overflow weir that maintains a consistent liquid level by allowing excess fluid to spill over when the tank reaches capacity, and a drain assembly that provides a controlled outlet for complete emptying during cleaning or maintenance. Constructed from stainless steel grades 304 or 316L, the component is suitable for hygienic environments and can be configured with either clamp or weld connections to match installation requirements. The nominal diameter ranges from DN25 to DN100 (ISO 6708), accommodating various tank capacities and flow rates. Overflow capacity is specified between 5 and 50 m³/h, ensuring the weir can handle peak inflow without flooding. Operating temperature spans -10°C to 120°C, making it compatible with CIP/SIP cleaning cycles, while the operating pressure range of 0.1–0.6 MPa is typical for gravity-fed systems; higher pressures may necessitate reinforced design. Surface roughness is maintained at Ra ≤ 0.8 µm (ISO 4287) to meet food-contact hygiene standards. Seal materials are available in EPDM for hot water applications or FKM for chemical resistance. The component length varies from 100 to 300 mm depending on tank wall thickness, and weight ranges from 0.5 to 5 kg. As a directory listing, these values are reference ranges; the actual model must be verified with the manufacturer for specific performance and compliance. Always confirm that the selected unit meets your process requirements and applicable standards before installation.

Working Principle

The overflow weir operates by creating a fixed spillway at a predetermined height. When the liquid level in the tank rises above this height, excess fluid flows over the weir and is directed to a drain outlet, preventing overfilling. The drain portion incorporates a valve or gate mechanism that, when opened, allows the tank contents to flow out by gravity. This dual action enables both continuous level control and complete drainage when needed. The weir height and drain valve size are selected based on the tank's capacity and desired flow rates, ensuring efficient operation during filling, washing, and emptying cycles.

Common Materials

Stainless Steel 304, Stainless Steel 316

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	DN25–DN100 mm	Select based on tank capacity and flow rate.ISO 6708
Overflow Capacity	5–50 m³/h	Maximum flow rate to prevent tank overflow.
Operating Temperature	-10–120 °C	For CIP/SIP cleaning cycles.
Operating Pressure	0.1–0.6 MPa	Gravity drain; higher pressure may require reinforced design.
Surface Roughness	Ra ≤ 0.8 µm	Hygienic finish for food contact.ISO 4287
Material Grade	304/316L	316L for corrosive media.ASTM A240
Seal Material	EPDM/FKM	EPDM for hot water; FKM for chemicals.
Connection Type	Clamp/Weld	Clamp for easy disassembly; weld for permanent installation.DIN 32676
Length	100–300 mm	Depends on tank wall thickness.
Weight	0.5–5 kg	Varies with size and material.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Weir Plate Part
Creates the overflow barrier that controls liquid level

Material: stainless steel
Drain Valve
Controls opening and closing of the drainage port

Material: stainless steel
Mounting Flange Part
Secures the assembly to the tank wall

Material: stainless steel
Gate Mechanism Optional
Alternative to the drain valve on gate-type versions: lifts to open the drain port for gravity emptying.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Stainless Steel Washing Tank

View system integration details

Manufacturers of Overflow Weir/Drain

Manufacturer profiles associated with Overflow Weir/Drain.

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Frequently Asked Questions

What is the purpose of the overflow weir in a washing tank?

The overflow weir maintains a consistent liquid level by allowing excess fluid to spill over when the tank reaches capacity. This prevents overfilling and ensures that the washing process operates at the correct volume.

Can this component be used for CIP/SIP cleaning?

Yes, the operating temperature range of -10°C to 120°C makes it suitable for CIP (Clean-in-Place) and SIP (Sterilize-in-Place) cycles. However, you must verify that the specific model and seal material are compatible with your cleaning agents and temperatures.

What are the available connection types?

The component can be supplied with clamp or weld connections. Clamp connections allow for easy disassembly and maintenance, while weld connections provide a permanent, leak-proof installation. The choice depends on your tank design and cleaning requirements.

How do I select the correct nominal diameter?

The nominal diameter (DN25–DN100) should be selected based on your tank's capacity and the required flow rate. A larger diameter allows higher flow but may require more space. Consult the manufacturer's guidelines to ensure the weir and drain can handle your process demands.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	0 to 1.5 bar (gauge)
flow rate:	Up to 50 m³/h
temperature:	-20°C to 120°C
slurry concentration:	Up to 15% solids by weight

Overflow Weir/Drain

Product Specifications

Applied To / Applications

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Application Fit & Sizing Matrix

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