Manway lid, also known as an inspection cover or access cover, is a closure device installed over openings in various facilities. It allows personnel or equipment to enter for installation, maintenance, cleaning, or inspection work, while keeping the opening sealed and secure when not in use. Typically composed of a cover plate, sealing element, hinges, and a locking mechanism.

Product Parameters

Category	Description
Material	Mainly includes cast iron, composite materials, and carbon steel.
Dimensions	Common diameters: 500mm to 1000mm; Thickness: 20mm to 100mm. Custom shapes such as round, square, and rectangular are available.
Sealing Performance	Utilizes rubber gaskets, silicone pads, etc., with waterproof rating up to IP67/IP68, ensuring water and gas leakage prevention.
Surface Treatment	Anti-slip designs (checkered plate, studded surface) Anti-corrosion treatments (hot-dip galvanizing, epoxy coating, asphalt coating)
Operating Environment	Temperature resistance typically ranges from -20°C to 300°C; pressure resistance up to 0.6MPa;
Installation Method	Mainly includes recessed, flanged, and welded types;

Product Advantages

High Strength & Durability: Made of 304 stainless steel with a yield strength of ≥205 MPa. The load - bearing grades cover A15 - F900, and the average service life is > 20 years.
Excellent Sealing & Leak Prevention: Manway lid equipped with sealing structure employs silicone rubber rings to ensure stable operation within a pressure range of 0.6 MPa and a temperature range from -20°C to 300°C.
Protective Design: Anti - slip serrated design with friction coefficient ≥0.65, the tensile strength of the lock is ≥10 KN.

Main Applications

Underground Utility Networks: Used for inspection openings of storm drains, sewer manholes, cable chambers, and communication conduits, facilitating cleaning and maintenance of underground facilities.
Industrial Equipment: Installed on petrochemical tanks, reactors, boilers, etc., allowing personnel entry for internal inspection, cleaning, or repair.

Frequently Asked Questions (FAQ)

Q1: How does the manway lid ensure waterproof sealing? Will it leak in rainy regions?

A1: It uses rubber gaskets and a recessed design to achieve an IP68 waterproof rating. Additional waterproof seals can be added.

Q2: Which is more durable, stainless steel or cast iron manway lid? Is the cost difference significant?

A2: Stainless steel offers superior corrosion resistance, ideal for chemical/humid environments with a longer lifespan, but is more expensive. Cast iron provides excellent load-bearing at a lower cost; galvanized surfaces suit general outdoor use. Choosing based on the environment is more economical.

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