Regular access to the inside of a tank is often required during cleaning, inspection, sampling, and equipment maintenance. A sanitary manhole cover provides this access point while helping maintain a clean and controlled processing environment.
Unlike pressure vessel manways, the Non-Pressure Sanitary Manhole Cover is developed for atmospheric or low-pressure tanks where operators need quick opening and closing during daily operations. The stainless steel cover, sanitary gasket, and secure locking structure work together to create a sealed access opening that is easy to operate and simple to maintain.
With options in SS304 and SS316L materials, different gasket types, and customized dimensions, it can be matched with various sanitary tanks used in food, beverage, dairy, pharmaceutical, and other hygienic processing systems.
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Category |
Specification Parameter |
Technical Details & Standards |
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Dimensional & Operating Limits |
Nominal Size Range (DN) |
Standard: DN200 to DN600 (8" to 24") Custom sizes up to DN800 available upon request |
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Working Pressure & Temperature |
Pressure Rating: Non-pressure / Atmospheric applications (Max 0.2–0.5 bar / 2.9–7.2 psi for dust & splash tightness) Operating Temperature: -20°C to +150°C (-4°F to 302°F) (Gasket dependent) |
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Material Specifications |
Metallic Body (Frame & Cover) |
Stainless Steel 304 (1.4301): Standard food, beverage, and dairy processing applications Stainless Steel 316L (1.4404): High-purity pharmaceutical, bioprocess, and corrosive media |
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Sealing Gasket Materials |
Silicone (Standard): Excellent elasticity and broad temperature range (-50°C to +180°C) EPDM / Viton (FKM) / NBR: Chemical, steam, or oil-resistant requirements Compliance: All gaskets compliant with FDA 21 CFR 177.2600 & USP Class VI |
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Standards & Compliance |
Compliant with 3-A Sanitary Standards, ASME BPE, EHEDG guidelines, and FDA compliance for product contact surfaces |
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Structural & Design Features |
Handle & Closure Options |
Hand Knobs: Ergonomic plastic knob or Stainless Steel 304/316 star wheel Hinge Mechanism: Smooth swing-open design with optional stay-open positioning latch |
Safety Warning: Always verify that internal tank pressure equals atmospheric pressure before loosening the handwheel. Never open under pressure.
Operation: Turn the ergonomic handwheel counter-clockwise to release, then swing open the cover. To seal, align the cover and tighten clockwise hand-tight.
1. Clean the gasket and gasket groove during every tank cleaning cycle.
2. Periodically inspect the elastomeric seal for wear, hardening, or cracking.
3. Replace damaged gaskets immediately to maintain zero-leak performance.
Vessel Entry: Serves as a primary service door (access hatch) for technicians to enter tanks, sanitary vessels, and underground networks for installation, thorough washdowns, and internal repairs.
Ingredient Loading & Sampling: In food, beverage, pharmaceutical, and fine chemical processing, Non Pressure Sanitary Manhole Coverprovide a convenient opening for raw material dosing, visual inspection, and quality sampling.
Inspection Lighting: Opening the manway during cleaning or maintenance allows natural light into the tank interior, improving visibility for service workers.
Safety Ventilation: Connects to external air ducts or facilitates natural airflow during maintenance to prevent gas accumulation and ensure a safe breathing environment for inside-tank operations.
Overpressure Protection & Explosion Prevention: Specialized models (such as emergency pressure relief or explosion-proof breather Non Pressure Sanitary Manhole Cover) act as safety valves that automatically vent excess pressure during thermal expansion or sudden pressure spikes, protecting vessels from rupture.
Sanitary & Hygienic Applications: Widely installed across food, beverage, dairy, pharmaceutical, and bio-engineering systems (typically sized between DN150–DN600). Designed with crevice-free interiors, high-integrity seals, and easy-clean surfaces to integrate seamlessly with hygienic pumps and vessels.
A: No. This model is strictly designed for non-pressurized (atmospheric) tanks. For pressure-rated applications, please inquire about our Pressure Manway Series.
A: Food-grade Silicone comes standard. EPDM, PTFE, and FKM/Viton options are available upon request based on chemical compatibility.
A: The neck collar/flange base is directly welded onto the tank opening by a qualified welder.
Address
Building 1, No. 505, Binhai Erdao, Xinghai Subdistrict, Longwan District, Wenzhou City, Zhejiang Province, China.
