Round Manhole Cover are the most common passage closure devices in pressure vessels. Their circular structure ensures uniform stress distribution and eliminates stress concentration, resulting in excellent pressure resistance and the largest passage area for a given perimeter. They are typically made of 304/316L stainless steel, with the inner surface polished to Ra≤0.8µm, and equipped with FDA-grade sealing rings. Operating pressures can reach 5.0 bar, and they are widely used in the food, pharmaceutical, and other hygiene industries. Industrial models are available in carbon steel and often feature quick-opening or hinged structures for easy operation.
Round Manhole Cover – Hygienic Tank Access Solution
The Round Manhole Cover is specifically designed for use in hygienic processing industries such as food, beverage, brewing, and pharmaceuticals. It offers a reliable and sanitary access point for inspection, cleaning, or maintenance of tanks and vessels. This model features an outward-opening round lid, ensuring user safety and convenience. Available with plastic or stainless steel handwheels, it allows for flexible customization based on operational needs. The inner surface is polished to a high sanitary standard (Ra 0.8µm–0.5µm), while the outer surface can be provided with a polished, matte, or sandblasted finish to meet different aesthetic and hygiene preferences. Designed to withstand working pressures up to 1.0 bar, the unit is sealed with FDA-compliant gaskets (EPDM, NBR, Silicone, FPM) certified under FDA 21 CFR 177.2600. Standard height options include 100mm, 120mm, and 150mm, and both height (H1) and wall thickness can be customized. Constructed from premium-grade stainless steel AISI 304 (1.4301) or AISI 316L (1.4404), this round manhole offers excellent corrosion resistance, long-term durability, and optimal hygiene performance for sanitary tank applications.
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