What is the flange manhole used for, and how many holes are there in various flanges?

Flange is also known as flange or flange. The flange is the part that connects the pipe to the pipe and connects to the pipe end. There are holes in the flanges, and the bolts make the two flanges close together.

The flanges are sealed with gaskets. Flanges are threaded (wired) flanges and welded flanges.

Manhole. A hole, usually with a cover, through which a person may enter a sewer, boiler, drain, or similar structureSewer access holes:

A kind of hole that is often covered and used by people to enter and exit the drain, boiler, sewer pipe, weak current wells including telecommunications and cable television, and internal passages for large bridge maintenance.

The manhole is a safety emergency ventilation device installed on the top of the storage tank, which is usually used with a fire extinguisher and a mechanical breathing valve, which can not only avoid the accident of damaging the storage tank when the tank is overpressurized or vacuum sharply caused by accidents, but also play a role in safety fire retardation, and is a safety device to protect the storage tank, especially suitable for the vault atmospheric tank with nitrogen capping for storage materials. It has the advantages of constant pressure discharge, constant pressure suction, flexible opening and closing, safe fire resistance, compact structure, good sealing performance, safety and reliability.

Manholes are divided into emergency pressure relief manholes, explosion-proof fire-arresting breathing manholes, tank top manholes, tank wall manholes and core manholes.

Many flanges with lower pressure ratings are. X0D X0a: The general conventional flanges are 4, 8, 12. Flange is a kind of mechanical product, according to the different needs of customers, or pressure and other factors can be designed as 6 holes, if it is not clear that the other party wants the use of this flange, you can ask the other party for drawings.

The stainless steel flange manhole is a safety emergency ventilation device installed on the top of the storage tank, which is usually used in conjunction with the mechanical breathing valve, which can not only avoid the accident caused by the sharp overpressure or vacuum in the tank caused by accidents, but also play a role in safety fire retardation, and is a safety device to protect the storage tank, especially suitable for the vault atmospheric tank where the storage material is capped with nitrogen. The stainless steel flange manhole has the advantages of constant pressure discharge, constant pressure suction, flexible opening and closing, safe fire resistance, good sealing performance, safety and reliability. Flange manholes are mainly divided into "rotary cover plate flat welded flange manholes" (see HG21516-95); "Rotary Cover with Neck Flat Welding Flange Manhole" (see HG21517-95), etc.; the other is called "plate flat welded flange hand hole" (see HG21529-95); The parts of "Hand Hole of Flat Welding Flange with Neck" (see HG21516-95) are mainly convenient for the operator's hand to reach into the inside of the equipment for processing and maintenance, adding fillers, etc.

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It is a component of chemical equipment, which is set up to facilitate the processing and maintenance of operators, filling fillers, etc. Divided into "rotary cover plate flat welded flange manhole" (see HG21516-95); "Rotary Cover with Neck Flat Welding Flange Manhole" (see HG21517-95), etc.; the other is called "plate flat welded flange hand hole" (see HG21529-95); The parts of "Hand Hole of Flat Welding Flange with Neck" (see HG21516-95) are mainly convenient for the operator's hand to reach into the inside of the equipment for processing and maintenance, adding fillers, etc.

Boilers, large pipes, equipment, etc., are designed for people to enter the channels designed for inspection and maintenance, and are sealed in the form of flanges, which are called flange manholes.

In the design of process pipelines and vessels, a manhole is set at some positions to facilitate manual access to the interior for overhaul and maintenance.

However, this position must be sealed in normal production operation. So design a flange and seal the hole with a flange cover.

The flange used to play this part is the manhole flange.

Installed on the pipeline, easy to use.

Flange manhole, isn't it something like a valve?