Applications And Sealing Of Pressureless Round Manhole Covers

A stainless steel manway can provide hygienic tank access while reducing exposure to outside contamination. For non-pressurized food and beverage tanks, a circular cover with a sanitary gasket and even ring-shaped compression can maintain a closed tank opening while allowing inspection, cleaning, and product access.

Why Aseptic Sealing Matters

A tank opening can become a contamination point during inspection, filling, or maintenance. Even gasket compression around the full circumference supports a more consistent seal and limits unwanted air exchange.

A stainless manway is intended for atmospheric or non-pressure tank service. The referenced circular design is also used to close the tank opening and maintain separation between the tank interior and surrounding environment.

Hygienic Design Features

•  Food-grade gasket options provide sealing around the cover.
•  Stainless steel construction suits routine washing and tank maintenance.
•  Smooth surfaces reduce areas where product residue can remain.
•  Circular geometry distributes fastening force around the sealing ring.

Where Sanitary Tank Manways Are Used

Sanitary tank manways provide access to processing vessels without leaving a permanent open connection. Their size and position depend on tank inspection, product loading, cleaning, and maintenance needs.

A steel manway can suit beverage, dairy, ingredient, and other atmospheric food-processing vessels. The selected cover should match the tank structure, cleaning method, and required access area.

Common Tank Applications

• Beverage storage and processing tanks
• Dairy and liquid-food vessels
• Ingredient holding tanks
• Atmospheric mixing and preparation tanks

Product Specification Reference

The referenced circular cover is available in SS304 or SS316L with welded installation and silicone, EPDM, Viton, or NBR sealing options. Listed sizes range from 8 to 24 inches, with a surface finish of Ra≤0.8. EPDM is listed for -10°C to +120°C service.

These are product reference values. Tank pressure, gasket compatibility, vessel dimensions, and sanitation conditions should be checked before installation.

Sealing, Cleaning, and Tank Access

The cover must provide both access and a hygienic boundary after closure. Gasket seating, compression, weld quality, and the surrounding tank surface all affect sealing performance.

CIP should also cover the manway, gasket, welded collar, and nearby tank surfaces. A smooth Ra≤0.8 finish supports cleanability, while the complete vessel design determines the final cleaning result.

Practical Inspection Points

• Gasket condition and correct seating
• Cover alignment and fastening
• Weld quality around the tank opening
• Surface cleanliness after CIP
• Seal compatibility with process temperature and cleaning agents

Stainless Steel Manway vs. Pressure-Rated Manway

A stainless steel manway for non-pressurized service should not replace a pressure-rated tank cover. The referenced circular design is intended for access and sealing on tanks without internal pressure.

When a vessel operates under positive pressure or vacuum, the cover structure, locking system, gasket, and pressure rating require a separate design review.

FAQ

What is a stainless steel manway used for?

It provides access to a sanitary tank for inspection, cleaning, product addition, and maintenance while keeping the opening closed during normal operation.

Is a non-pressure manway suitable for every food tank?

No. It is intended for non-pressurized service. Tanks exposed to pressure or vacuum require a suitable rated cover.

Which gasket materials are available?

The referenced design lists silicone, EPDM, Viton, and NBR. Selection should match the product, cleaning agents, temperature, and sanitation cycle.

Selection Factors for Food & Beverage Service

1. Tank pressure: Confirm whether the vessel operates at atmospheric pressure, positive pressure, or vacuum.
2. Material: Select SS304 or SS316L for the product and cleaning environment.
3. Seal: Match the gasket material with process and sanitation conditions.
4. Size: Choose the opening according to access and loading requirements.
5. Surface finish: Check the required sanitary finish for vessel cleaning.
6. Installation: Confirm weld dimensions, cover alignment, and gasket seating.

For food and beverage vessels, a stainless steel manway should match the tank pressure, access requirements, sealing material, and sanitation process. A non-pressure circular cover suits atmospheric service where hygienic closure and practical tank access are required.

Sanitary Stainless Steel Cover Manhole Round None Pressure

• Non-pressurized tank manholes are available in SS304 or SS316 (as special order).
• Their primary application is to make the liquid in the tank accessible, allow checking of liquid levels.
• While still retaining control over the head-space atmosphere of the tank - manholes do seal and prevent air exchange.
• But are not designed to withstand the stronger pressure like tank manways.
• Manholes are usually mounted on top of the tank with the size depending on the condition application: larger for ease of adding solids, or smaller for adding liquids or powders.

Technical Data

Product Parameter

Product Pictures