Manhole – Cangzhou Huairong Pipeline Equipment Co., Ltd.

PRODUCT PARAMETERS

The Manhole is a critical inspection and safety sealing component for storage tanks, vessels, towers, and pipeline systems. It is composed of flanges, cover plates, hinges, lifting rings, and fastening elements.

Its primary function is to provide personnel with access to the interior of containers or pipelines for equipment installation, inspection, cleaning, and maintenance. At the same time, its sealing structure ensures the safety of internal pressure and media. It is an essential accessory for industrial production and vessel operation & maintenance.

Application Fields: Widely used in petroleum & petrochemical, oil & gas transportation, power & energy, metallurgy & shipbuilding, pharmaceutical & food, wastewater treatment plants, waterworks, and tank engineering. It serves as the key access component for maintenance, inspection, and cleaning of various storage tanks, vessels, towers, and pipeline systems—particularly suitable for industrial containers and pipelines requiring periodic internal inspection and handling of pressurized or corrosive media.

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Description

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Description

Item	Specification
Product Size	DN400–DN1000 (16″–40″) and other common specifications; customization available
Pressure Rating	PN6–PN25 / Class 150, Class 300 (customized according to the service environment)
Manufacturing Standards:	Complies with GB, ANSI, DIN, JIS and other international standards
Material	Carbon steel, stainless steel, alloy steel, pipeline steel, low-temperature steel, duplex steel, etc.
Surface Treatment	Pickling and passivation, anti-rust oil coating, painting, hot-dip galvanizing, sandblasting, etc., as per customer requirements
Origin	China
Connection Type	Butt-welded (flange welded and fixed to the vessel/pipeline wall, consistent with the figure); bolted connection customizable
Temperature Range	-50℃ ~ +450℃ (carbon steel/pipeline steel); -196℃ ~ +650℃ (alloy steel/low-temperature steel/duplex steel/stainless steel). The specific temperature resistance depends on the material and application conditions.

FAQs

Are you a manufacturer or a trading company?

Can you manufacture customized flanges and pipe fittings?

Yes. In addition to standard products, we provide customized flanges and pipe fittings according to customers’ drawings, technical specifications, material requirements, dimensions, pressure ratings, surface treatments, and application conditions. Our production facilities support forging, pressing, machining, cold forming, hot extrusion, heat treatment, and other manufacturing processes.