Can the two flange bolt holes be docked if the position is not the same?

If the position of the two flange holes is not the same, it is not appropriate to drill a new hole again, affecting the flange force, and the work is easy to be dangerous under high pressure, so it can not be docked at will, the product quality is strict, can not be sloppy, and many safety accidents are caused by poor product quality and random installation. The standard mounting flange specifications are; Flange connection.

, pay attention to the alignment of the bolt holes of the two flanges and connect the flanges.

The bolts should be of the same specification, and all nuts should be located on one side of the flange. If connected to the valve, the nut should generally be placed on the side of the valve. When tightening bolts, use a suitable wrench.

Tighten it in 2-3 times, not at one time. The tightening bolts should be carried out symmetrically and evenly in order, and the tightness should be appropriate. Large-diameter flanges are best carried out by two people at the same time in a symmetrical position.

You can make a variable diameter flange, which is not allowed to be overdone, and the high pressure is easy to have problems.

The installation is unqualified, not standardized, there is nothing to do without an accident, there is trouble in the accident, a flange is not worth much, if you drill holes in the flange again, the flange unilaterally can not reach the specified pressure, and the customer can also take this when the customer accepts.

Money is a small thing, security is a big thing.

Now it is not done according to the specifications, so the bridge and the building collapsed.

Small model, common to all of the following. If the construction schedule is not tight, it is best to replace it according to the standard.

This is true all over the country. Not so strict.

What are the rules for the direction of penetration of valve flange bolts? Are the two pairs of flanges at the entrance and exit on one side or are the nuts on the outside or inside?

Dear, hello, I am glad to answer for you what are the regulations for the penetration direction of valve flange bolts? Are the two pairs of flanges at the entrance and exit on the same side or are the nuts on the outside or inside? A:

There are no strict rules on the direction in which the valve flange bolt is inserted, but it is more convenient for the bolt to easily penetrate the valve from the outside. Because of blindness, this nut generally touches the airside of the valve.

Flange bolt: consists of a hexagonal head and a flange (the gasket under the hexagon is fixed together with the hexagon) and a screw (a cylinder with an external thread).

A type of fastener composed of parts, which needs to be matched with a nut, is used to fasten and connect two parts with through holes.

This form of connection is called bolted connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.

Classification 1, hexagonal flange type: there are two kinds of hexagonal heads, one is flat-brained, and the other is concave-brained.

2. Surface color category: According to different needs, the surface has white, army green, color yellow, and Dacromet that will never rust.

3. Flange category: According to the different locations of flange bolts, the size requirements of the disc are different, and there are flat bottom and toothed points, and the tooth plays an anti-slip role.

4. According to the force mode of connection, there are ordinary ones and those with hinged holes. The flange bolt used for reaming the hole should be matched with the size of the hole and used when subjected to transverse force.

In addition, in order to meet the needs of locking after installation, there are holes in the rod part, which can make the bolt not loosen when it is vibrate.

Some flange bolts have no threaded smooth rods to be thin, which is called thin rod flange bolts. This flange bolt facilitates the connection of the subject to variable forces.

There are special high-strength bolts on the steel structure. The head will be bigger. There are also variations in size.

Note: At present, the commonly used national standard numbers in the market, GB5789 (large head) and GB16674 replace GB5787 (small head).

Flange bolt holes can be distributed on the centerline, but the flange bolt holes should be installed in the middle span.

For details, please refer to Article GB50235-1997 and Article GB for details.

As far as I know, it should be on the pitch circle, as for the center line you said, it may not be possible, but the flange is a standard part, not a special part, if it is not made according to the standard, it is more troublesome to replace. Unless the criteria are changed.

If it is done as a special part, it must be tested accordingly to ensure that the various properties meet the requirements.

Threaded connection and flange connection are two different connection methods, generally small pipe diameter is connected with thread, large pipe diameter is connected with flange. The threaded flange connection should be considered as a special flange, with one end flanged and one end threaded.

Threaded connection and flange connection are two commonly used connection methods for valves and pipe fittings, and other connection methods include welding (including butt welding and socket welding), clamp connection, butt clamp connection, etc.

Threaded connection refers to the internal and external threads at both ends of the joint, which are connected by the two screws;

Flange connection means that both ends of the connection are flanged, and the connection is achieved by locking with bolts and nuts;

The flange is the component used in the flange connection, and the flange must first be connected with the pipe, pipe fittings, etc., to become one of the ends of the "two ends of the connection" in the above statement. According to the connection mode of flange and pipe and pipe fittings, flanges are divided into: plate flat welded flange, flat welded flange with neck, integral flange, socket welded flange, threaded flange, butt welded ring loose flange, flange cover, etc.

Now it's clear.

Flanges are generally connected with studs.

Flange, also known as flange disc or flange. A flange is a part that is connected to each other between shafts and is used for the connection between pipe ends; There are also flanges used on the inlet and outlet of the equipment, which are used for the connection between two equipment, such as the reducer flange. Flange connection or flange joint refers to the detachable connection of flanges, gaskets and bolts connected to each other as a set of combined sealing structures.

Pipe flange refers to the flange used for piping in piping installation, and used in equipment refers to the inlet and outlet flange of equipment. There are holes in the flanges, and the bolts make the two flanges close together. The flanges are sealed with gaskets.

Flange sub-threaded connection (threaded connection) flange, welded flange and clip flange. The flanges are used in pairs, and the wire flange can be used for low-pressure pipes, and the welded flange is used for pressures above four kilograms. A gasket is added between the two flanges and then bolted.

The flange thickness is different for different pressures, and the bolts they use are also different. When the pump and valve are connected to the pipeline, the parts of these equipment and equipment are also made into corresponding flange shapes, also known as flange connections.

Any connecting part that is bolted around two planes and closed at the same time is generally called a "flange".

For details, see Encyclopedia: Flange.