Round Stainless Steel Manway Lids
- Model:
- Place of Origin:
- Wenzhou, China
- Packing:
- Suitable Packing for Sea/Air Transport
- Quantity:
- 500000 PCS Per Year
- Payment:
- T/T, L/C, Western Union
- Material:
- SS304,SS316L
- Connection:
- Welding
- Shape:
- Round
A stainless steel manway functions as an unpressurized entry hatch mounted on processing vessel heads to facilitate ingredient additions, sampling, and internal inspection. Fabricated from forged AISI 304 or AISI 316L alloys, these circular assemblies operate under static atmospheric conditions (0 bar gauge) while sealing against environmental ingress across standard diameters from 200 mm to 600 mm.
Sanitary Barrier Design Against Environmental Ingress
Food and pharmaceutical processes require wet-contact surfaces with roughness values below 0.8 µm Ra, polished mechanically or through electro-chemical finishing. An outward-opening stainless manway incorporates an overlapping lip profile around the neck collar to direct washdown run-off away from the sealing perimeter.
Flush internal welds prevent microbial harborage, ensuring automated cleaning solutions strip away organic residues without manual scrubbing.
Gasket Performance Metrics In Ambient Containment
Elastomer resilience dictates seal longevity under atmospheric conditions where fluid head does not provide mechanical self-sealing force. Gaskets rely entirely on dimensional recovery to prevent air ingress and aroma loss.
| Elastomer Grade | Temperature Range | Environmental Resistance | Compliance Standard |
|---|---|---|---|
| EPDM | -40°C to 135°C | Atmospheric Ozone, Alkaline Washes | FDA 21 CFR 177.2600 |
| Silicone | -50°C to 200°C | Thermal Shifts, Neutral Solutions | 3-A Sanitary 18-03 |
| NBR | -25°C to 110°C | Vegetable Oils, Fatty Product Streams | FDA 21 CFR 177.2600 |
Compound degradation leads to gasket flattening or embrittlement, allowing microscopic airborne contaminants to compromise process batches during prolonged storage cycles.
Hinge Ergonomics And Counterbalance Handling
Repetitive batch additions require smooth hatch manipulation. Hand-tightened composite knobs secure stainless steel manway lids against collar faces with minimal operator exertion.
Integrated hinge stop mechanisms arrest cover movement at 100 degrees of travel, preventing accidental closure during ingredient introduction. Heavy-diameter designs utilize spring-assisted pivots to neutralize cover weight, protecting sealing faces from alignment shock during closure.
Thermal Distortion Prevention Across Neck Collar Welding
Vessel roof fabrication generates localized heat input that warps cylindrical collars out of round. Symmetrical quadrant tacking followed by staggered TIG passes preserves rim flatness, ensuring the steel manway matches its mating gasket plane.
Post-fabrication pickling removes weld discoloration, re-establishing the chromium oxide film to resist atmospheric corrosion in humid production environments.
Product Description
| Product Name: | Round Outward Manway |
| Material: | SS304 or SS316L |
| Standard: | 3A, SMS, DIN, RJT, IDF |
| Size: | 8"-24" (200mm-600mm) |
| Height: | 100mm |
| Thickness: | 3mm |
| Handle Material : | Stainless steel and plastic |
| Handle number: | 4-6 pieces |
| Type: | With sight glass or without. |
| Seal Material: | Silicone, EPDM, Viton, NBR |
| Surface Finishing: | Ra≤0.8 |
| Working Temperature: | -10 degree to +120 degree (EPDM) |
| Packing Details: | Carton box,plywood case or customized |
Product Parameter
