Stainless Steel Round Manhole
Stainless steel round manholes provide access openings for non pressure process vessels, tanks and machinery. NOWARUN manufactures them in SS304 or SS316 covering nominal sizes from DN150 up to DN800 with brushed or mirror finishes down to Ra 0.4 to 0.8 micrometers. Equipped with silicon, EPDM, FPM or NBR gaskets and stainless steel or plastic hand-wheels, units are fabricated to your specific tank drawings rather than selected from fixed catalogue stock.
Published Data for Stainless Steel Round Manhole
Every value below is taken from NOWARUN's own specification for this part.
| Product Name | Round Manhole |
|---|---|
| Material | SS304, SS316 |
| Size Range | DN150 to DN800 (DN150mm to DN600mm / DN800mm) |
| Pressure Rating | Non pressure |
| Surface Smoothness | Ra 0.4 to 0.8 micrometers |
| Polishing | Brushed finish, mirror finish |
| Hand-Wheel Material | Stainless steel, plastic |
| Gasket Material | Silicon, EPDM, FPM, NBR |
| Origin | Hangzhou, Zhejiang, China |
| Packaging | PP bag, carton, crate, box or to customer requirement |
Key Benefits
- Fabricated from SS304 or SS316 to handle corrosive environments across food processing and industrial tanks
- Surface finishes finished to Ra 0.4 to 0.8 micrometers prevent product hangup and simplify cleaning cycles
- Size range spanning DN150 to DN800 accommodates small inspection ports up to full equipment access points
- Gasket materials include silicon, EPDM, FPM and NBR to match broad chemical and thermal working parameters
- Non pressure flange design simplifies manual access while maintaining positive closure on process vessels
- Custom logos and dimensions produced directly to customer drawings or vessel build specifications
Problems It Solves
- Rough weld or surface finishes harbor residues inside tanks, solved by defined Ra 0.4 to 0.8 micrometer polishing
- Aggressive process fluids attacking generic seals, solved by offering application-specific silicon, EPDM, FPM or NBR
- Fixed catalogue access ports failing to fit specific vessel diameters, solved by manufacturing across DN150 to DN800
- Stock suppliers unable to provide custom-marked or branded assemblies on standard vessel components
Who It Is For
- Vessel builders fabricating fermenters, distillation tanks and storage units to client drawings
- Food processing equipment OEMs needing sanitary-grade stainless steel hatches with defined roughness values
- Process machinery rebuilders sourcing replacement stainless steel tank covers with specific gasket compounds
- Industrial tank manufacturers requiring custom-branded round manholes across metric sizing standards
Application Scenarios
- Fermenter access covers in food processing operations requiring sanitary interior surfaces
- Storage tank inspection hatches where regular manual entry or batch verification is required
- Distillation equipment access ports operating under atmospheric non pressure working conditions
- Drying machines needing sealed access panels for scheduled cleaning and interior routine maintenance
- Custom machine construction where vessel ports must integrate directly into fabricated tank shells
Technical Features
- SS304 and SS316 stainless steel fabrication for structural body and flange elements
- Surface roughness controlled between Ra 0.4 and 0.8 micrometers with brushed or mirror finishing options
- Hand-wheel configurations available in stainless steel or plastic options for manual tensioning
- Gasket sealing profiles supplied in silicon, EPDM, FPM or NBR formulations
- Non pressure rated design suitable for atmospheric process vessels and tanks
Materials
- SS304 stainless steel for standard atmospheric vessel bodies and tank covers
- SS316 stainless steel for enhanced corrosion resistance in aggressive or acidic process media
- Silicon, EPDM, FPM and NBR elastomer compounds selected to suit liquid or vapor contact
- Stainless steel or molded plastic hand-wheels for manual vessel opening mechanisms
How It Is Made
- 1
Drawing verification confirming nominal diameter, flange dimensions, gasket profile and hand-wheel material
- 2
Stainless steel plate cutting, forming and rolling to round manhole frame specifications
- 3
Flange welding and mechanical assembly of hinge and hand-wheel retaining hardware
- 4
Mechanical surface polishing to achieve specified brushed finish or mirror finish Ra 0.4 to 0.8
- 5
Elastomer gasket fitting and seal seat inspection prior to packaging
- 6
Packaging in PP bags, cartons, crates or boxes according to customer specifications
Quality Control
- Surface roughness verification against the specified Ra 0.4 to 0.8 micrometer range
- Dimensional check across nominal diameters from DN150 to DN800 against customer drawings
- Material verification to ensure SS304 or SS316 grade compliance
- Gasket seat and closure fit checks before release to export packaging
Customization Options
- Nominal diameter sized from DN150 up to DN800 according to vessel design requirements
- Selection between brushed finish or mirror finish based on internal sanitation demands
- Choice of hand-wheel material in either stainless steel or industrial plastic
- Gasket material tailored to vessel chemistry using silicon, EPDM, FPM or NBR
- Custom logos etched or stamped onto assemblies upon request
Compared With the Alternatives
| Alternative | Honest trade off |
|---|---|
| Pressure rated manhole | Non pressure round manholes cost less and open faster, but they cannot operate under elevated tank working pressures |
| Standard mill finish hatch | Ra 0.4 to 0.8 polished surfaces clean more reliably in food applications, though they require more finishing labor |
| Catalogue stock manholes | Made-to-drawing units match exact vessel dimensions and gasket requirements, though they carry short manufacturing lead times |
Use Guide
- Confirm your tank vessel operates under non pressure conditions prior to specifying this hatch
- Specify SS304 or SS316 depending on the chemical properties of the process media inside the tank
- Select the gasket elastomer silicon, EPDM, FPM or NBR matching the product contact temperature and chemistry
- Select brushed or mirror finish based on required Ra 0.4 to 0.8 micrometer process cleaning protocols
- Tighten the hand-wheel evenly to compress the elastomeric gasket against the seating face
Stainless Steel Round Manhole Questions
What size range is available for this round manhole?
Units can be produced across nominal diameters spanning DN150 to DN800 depending on your tank opening specification.
What surface roughness finish can you supply?
We provide brushed or mirror polishing with surface smoothness verified between Ra 0.4 and 0.8 micrometers.
Is this manhole rated for pressurized tanks?
No. This design is built specifically for non pressure applications such as atmospheric fermenters, dryers and storage vessels.
Which gasket materials are available?
We supply silicon, EPDM, FPM and NBR gaskets to suit different chemical and thermal operating environments.
What material options exist for the hand-wheel?
Hand-wheels can be ordered in either stainless steel or plastic depending on operating preference and cost requirements.
How is the manhole packaged for overseas shipping?
Units are packed in PP bags, cartons, crates or boxes, or according to your company's export packing specification.
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