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2024-09-30

Full Analysis of Chemical Flange PN Series Standards: Identification Details Revealed

"HG20592-2009" is the standard number implemented by the flange. HG/T 20592-2009 here is the "PN series" standard in the chemical standard, while the "Class series" standard is HG/T 20615-2009. Due to the large number of flange standards, in order to facilitate identification, it can be remembered that the beginning of HG is the chemical standard, the beginning of GB is the national standard, the beginning of JB is the mechanical standard, the beginning of SH is the petrochemical standard, and the beginning of CB is the marine standard.

2024-09-30

Flanged connection vs clamp connection: how to choose the best pipe connection method?

1. The structure is complex but stable: the flange is connected through two pipes or equipment with flanges, and then the flange is bolted to form a whole. The structure is relatively complex, but the connection is more stable. 2. Excellent sealing performance: the sealing gasket between flanges can effectively prevent media leakage and ensure the safety and stability of the connection. The materials of flange gaskets will also be selected according to the pressure level, from low-pressure asbestos pads, high-pressure asbestos pads and tetrafluoro pads to metal pads.

2024-09-30

Flange sealing and leakage sealing treatment method

There are many factors that affect the flange sealing. Mainly: bolt prestressing force; sealing surface type; gasket performance; flange stiffness; operating conditions. For decades, the ANSI flange designed by the National Standards Institute of the United States has provided a suitable sealing technology for the oil and gas industry, and has been very effective. However, as the demand of the oil and gas industry has changed, the defects of the ANSI flange are constantly exposed. Cost-effectiveness principles, environmental protection, and optimal health and safety assurance are the three major issues facing operators and contractors in the 21st century, so people began to consider new flange sealing methods.

2024-09-30

How to identify and select flange gaskets!

The gasket is the main seal of the flange connection, so the correct selection of gasket is also the key to ensuring that the flange connection does not leak. According to the different materials, gaskets can be divided into many types. In addition to the type of gasket, the identification and selection of the gasket are also very important!

2024-09-30

Examples of flange marks and marks

The flange should be marked according to the nominal diameter, nominal pressure, sealing surface form code, the series code of the steel pipe used (the code of the metric pipe is "Series 2", and the imperial pipe is not marked) and the standard number. Marking example: convex welded steel pipe flange with nominal diameter of 80mm and nominal pressure of 4.0MPa (25bar) (with meter tube)

2024-09-30

Why do the production of flanges and valves require heat treatment?

Ordinary flanges and valves generally do not require heat treatment. But sometimes, when they have requirements for strength, hardness, rust resistance, etc., heat treatment is required. Heat treatment refers to a metal heat processing process in which the material is heated, insulated and cooled to obtain the expected structure and performance in the solid state. The valve is a control component in the fluid conveying system, which has the functions of shut-off, regulating, guiding, preventing countercurrent, regulating pressure, diverting or overflowing.

2024-09-30

What is a flange? What is the use of the flange?

Flange is a disc part, which is most common in pipeline engineering. Flanges are used in pairs. In pipeline engineering, flanges are mainly used for pipeline connection. In the pipes that need to be connected, a flange is installed in various ways. Low-pressure pipes can be wired flanges, and welding flanges can be used for pressures of more than 4 kg. A sealing point is added between the two flanges, and then fastened with bolts.

2024-09-30

Pressure level of valves and flanges

According to ASME B16.5, the steel flange has 7 pressure levels: Class150 - 300 - 400 - 600 - 900 - 1500 - 2500 The pressure level of the flange is very clear. The flange of Class300 can withstand more pressure than that of Class150, because the flange of Class300 needs to be made of more materials, so it can withstand greater pressure. However, the pressure capacity of the flange is affected by many factors. The pressure level of the flange is expressed in pounds, and a pressure level is expressed in different ways. For example: 150Lb, 150Lbs, 150# and Class150 have the same meaning.

2024-09-30

Do you know all eight kinds of flange gaskets? Introduction to the occasion and scope of use

Natural rubber is suitable for water, seawater, air, inert gas, alkali, salt aqueous solution and other media, but it is not resistant to mineral oil and non-polar solvents. The long-term use temperature does not exceed 90℃, and has excellent low-temperature performance. It can be used above -60℃. Nitrile rubber is suitable for petroleum products, such as petroleum, lubricating oil, fuel oil, etc. The long-term use temperature is 120℃, such as 150℃ in hot oil, and the low temperature is -10~-20℃.

2024-09-30

Overview of plug-in welding flange

The plug-in welding flange refers to the flange inserted into the flange ring ladder at the end of the pipe and the outer flange. There are two types of neckless and neckless. The flange with neck tube has good rigidity, small welding deformation, and good sealing. It can be used in situations with a pressure of 1.0~10.0MPa. The B-type flange for containers is also a plug-in welding flange, which is used in occasions with high sealing requirements. When designing, the plug-in welding flange can be checked according to the integral flange.

2024-09-30

Standard for plate flat welding flanges

Plate flat welding flange (chemical standard HG20592, national standard GB/T9119, machinery JB/T81): convenient material, simple manufacture, low cost, wide use; but poor rigidity, so it should not be used in chemical process piping systems with supply and demand, flammable, explosive and high vacuum requirements and Highly and extremely harmful occasions. The sealing surface type has a plane and a protruding surface.

2024-09-30

Brief introduction and scope of application of loose sleeve flange

A live sleeve flange refers to a flange that is loosely set on the edge of a container or pipe. Flanges are parts connected to each other between the shaft and shafts, which are used to connect between pipe ends. There are also flanges used in the entrance and exit of equipment for the connection between the two equipment.

2024-09-30

Production materials of flange covers

The flange cover is also known as blind plate flange and blind plate. It is a flange without holes in the middle for sealing the pipe plug. The effect is the same as the welding head and the wire buckle pipe cap, but the blind flange and wire buckle pipe cap can be removed at any time, while the welding head is not.

2024-09-30

Brief introduction and principle of threaded flange

Threaded flange refers to a flange that is connected to the pipe by thread. When designing, it can be processed according to the loose flange. The advantage is that there is no need for welding, and the additional torque generated on the cylinder or pipe when the flange is deformed is very small. The disadvantage is that the flange is thick and the cost is high. Suitable for the connection of high-pressure pipelines.

2024-09-30

Fland connection process

The process of flange connection is as follows: First, the connection between the flange and the pipe should meet the following requirements: 1. The center of the pipe and the flange should be on the same horizontal line. 2. The sealing surface of the pipe center and the flange is 90-degree vertical. 3. The position of the flange bolts on the pipe should be consistent. Second, the requirements for flange gaskets are as follows: 1. In the same pipe, the flange with the same pressure should choose the same gasket, so that it is convenient to exchange with each other in the future. 2. For pipes with rubber plates, it is best to choose rubber gaskets, such as water pipes. 3. The selection principle of the gasket is: choose as close as possible to the small width, which is the principle that should be followed on the premise of determining that the gasket will not be crushed.