slip on flange does not mean a flange is just a welding method, applicable to any form of flange in the end of the pipe connection, a kind of flange known as flat welding, design according to the flange ring and straight cylinder section of the overall process of connection, respectively according to the whole or loose flange checking. Flat welded flanges are suitable for many types of flanges, but they also have a certain range of applicability, suitable for carbon steel pipe connections with nominal pressure not exceeding 2.5 MPa. For example, the demand for flat welded flanges in smooth pipes is the largest.

slip on flange this welding method is often used in mild medium conditions, such as low-pressure non-purified compressed air, low-pressure circulating water, its advantages are relatively cheap. Flange rings can be divided into two kinds of band ring and no band, but compared with the band ring butt welding method, slip on flange has simple structure, does not need to consume too much material, but the rigidity and sealing is not as good as the band ring butt welding flange.

Flat welded flange is suitable for any type of flange shape, but the scope of application is also limited. Flat welded flange manufacturer generally applies to the connection of medium and low pressure vessels and pipes. Welding flanges for containers can be divided into two types A and B. A slip on flange structure is a common ring plate. Type B flat welded flange has a short and thick barrel joint besides the ring plate. The sealing surface is machined after welding, and the flange ring has a ladder groove (equivalent to socket welded flange) at the joint of the ring and the short joint, which can ensure the welding quality. Therefore, the sealing performance is good, and it is used in the occasion of higher sealing requirements. The design is checked according to the integral flange.

Generally speaking, measuring the center distance of flange is the center diameter of two bolt holes. Putting the vernier points at both ends of the vernier in the center of the bolt hole is the center distance of flange. The first is to judge the type of flange, the commonly used flange types are flat welding flange, butt welding flange, socket welding flange, plate flat welding flange, ring loose sleeve flange; the second is to judge the flange end form, mainly RF surface, concave surface, convex surface, RJ torus. After judging the type of flange, the main measured data are bolt hole center distance, flange internal diameter, flange thickness, flange nozzle caliber, etc. Then the measured data can be compared with the standard to see the specific type of flange. Measuring flanges is actually very simple, just go back and take a good look at the standards, HG20592 and HG20615 described above in great detail (HG20592 is the PN series standard) (HG20615 is CLASS series standard).

Brief introduction of Ship flanges; connection of Ship flanges, Ship flanges is used for flange on the ship, flange is to make the pipe and pipe connected to each other parts. Connect to tube ends. The flange has holes, and can be worn through bolts to make the two flanges tightly connected. The flange is sealed with a gasket. Flange connection is the two pipes, fittings or equipment, first fixed on a flange, between the two flanges, plus flange pad, bolted together to complete the connection. Some pipe fittings and equipment have their own flange, also belong to the flange connection, Classification 1 Marine flat welding flange is the pipe into the flange inner ring welding flange, flat welding flange is divided into flange with neck welding flange and plate lap welding flange two kinds. Flat welded flange has the advantages of simple manufacturing, low production cost, but not high temperature and high pressure resistance, mainly used for atmospheric temperature pipeline with pressure less than 2.5 MPa, is the most used flange in ships. 2 Marine butt welding flange, also known as high neck flange, refers to the flange with neck and pipe transition and pipe butt welding connection. Butt-welding flange is hard to deform, well sealed, widely used, suitable for high pressure and temperature occasions, nominal pressure PN in about 16 MPa. It is mainly used for compressed air piping system and carbon dioxide piping system. 3. Loose-sleeve flange, also known as looper flange, is generally made of pipeline material with high cost. In order to reduce the cost, the use of pipeline with the same material and different material combination of flanges, is the use of flanging, rings and other flange sleeve on the end of the pipe, flange can move on the end of a pipe fittings. Loose flange is usually used for copper nickel alloy pipe and expansion joint. 4 Marine hydraulic flange ship hydraulic pipeline pressure is very high, so all use plug-in high-pressure method, flange thickness according to the pipe diameter is about 30 mm-45 mm, this flange generally uses a concave flange and a convex flange connection, using O-ring as sealing material.

How to divide steel pipe flange? According to the pressure of pipes and the type of sealing gasket, the steel pipe flange has different sealing surface types.
Flat (FF) pipe flange
It is suitable for the occasions with less pressure (PN < 1.6MPa).
Raised face (RF) steel pipe flange
The sealing surface is simple, smooth and easy to process.At the same time, it is easy to carry corrosion lining.
However, the contact area is large, and the gasket can be easily squeezed on both sides during preloading.Then it’s not easy to press.
Male and female (M/F) face steel pipe flange
It consists of a convex and concave surface and places the washer on the concave surface.It prevents the washer from extruding.Therefore, the male and female flanges can be applied to higher pressure situations.
Tongue groove (T/G) face steel pipe flange
The touch surface is made of tongue and groove.The washer is placed in the groove and cannot be squeezed.
Compared with RF and MFM, T/G surface flanges can achieve good sealing effect. Flange construction and manufacture is more complex.
It is difficult to replace the washer in the slot.Tongue tank cover for flammable, explosive, toxic, medium, high-pressure situations.
How to divide steel pipe flange? According to different standards, steel pipe flanges can be divided to European standards and American standards. The two systems are not interchangeable due to their different sizes.The American countries and China mostly use ASME or ANSI. Flange of ASME pressure level can be divided into 150, 300, 600, 900, 1500, 2500.

ANSI / ASME standards steel pipe flanges overview:
ANSI/ ASME B16.5
Standard for steel pipe flanges and flange fittings. (contains sizes from NPS 1/2 to NPS 24 metric/inch, including pressure temperature rating, materials, dimensions, tolerances, marking, testing and methods for specifying pipe flanges and flange fittings.) Except for ANSI/ ASME B16.5, American standard also including ANSI/ ASME B16.47 for large diameter flanges and ANSI/ ASME B16.48 for line blanks.
The function of steel pipe flanges:
Steel pipe flange is a type of pipe fitting that connects two pipes, or pipes and valves and equipment.The holes on the flanges are connected by a steel bolt and then sealed between the two flanges using a gasket in the middle. Therefore, flange, blind flange, socket welded flange, threaded flange, welding neck flange and slip on flange are divided according to different applications and styles.
Metleader offers various steel pipe flanges for using in various industrial sectors, petroleum and natural gas transportation, chemical plants, power stations, water treatment, refining, etc. Hope our steel pipe flanges would be confirmed by more and more clients from all over the world.

Weld neck flange is one of the most widely used in engineering applications. Metleader Flange Factory was established in 1982, for more than 36 years, we continue to innovate and continue to develop. Now has the most advanced production technology at home and abroad and the most extensive customer groups. We produce the flange, the first is the quality of high reliability, followed by reasonable price. Can fully meet your price and quality requirements. How to buy weld neck flange is some of the tips we are going to bring to you today.

A high-quality weld neck flange must meet the requirements of several aspects, then the quality of products will have what aspects of the requirements?

1. In the first place is the standard of products, flange products such as the first need to ensure better standards, and only to achieve the corresponding standard, if it is not standard, one is in use without better performance, but also difficult to use the life of the process. Of course, want to let a factory in this product has better standards, not only need to have the corresponding strength, but also need to have a better production reputation.
2. Second, in addition to what is said above, a high-quality weld neck flange also needs to be relatively easy in welding, because this kind of flange is to weld the means of the flange, natural in the manufacturer’s production, it is necessary to always think of the user’s welding, some manufacturers because in the production of no further consideration in this regard, So the user will cause trouble in welding, such products even if there is a high quality, but also difficult to users like, because of its trouble in welding will increase the user’s use costs.
3. Of course, any product also has its own performance, as for weld neck flange, but also has its own multifaceted performance requirements, the first is to have a better sealing function and impact resistance, but this also needs to let manufacturers have a certain strength, if the manufacturer does not have the strength, naturally it is difficult to meet the requirements of this area. And now there are a lot of flange in the use of high temperature, high anti-corrosion what aspects of the requirements, and this also has a higher demand for manufacturers, so the user wants to choose a high-quality flange, first of all, the manufacturers need to carefully choose.

How to buy weld neck flange?
What should be paid attention to when choosing the right weld neck flange?

1. How to buy weld neck flange? First, Market decision to choose the welding product information, choose the right butt welding flange, timely understanding of the choice of good welding flange use, the successful choice, better grasp a rational market.
2. How to buy weld neck flange? The choice has the safeguard, has the qualification attestation the butt welding flange factory, guarantees the follow-up to the welding flange the use, does not appear the quality deviation, is the most reasonable value place. Adhere to the choice, understand the development, these points are gradually small, or even become the most prominent choice of performance.
3. How to buy weld neck flange? Pay attention to the price of raw materials welding flange, according to raw material prices, to choose the choice of flange products. Products below the price of raw materials, can be judged as a problem product.Not recommended to have a certain quality requirements of customers to buy.
4. How to buy weld neck flange? When choosing a large amount of flange, you can choose to visit the factory. More professional and intuitive visits can help you make better choices. We as a professional manufacturer of flange, is willing to assist you in the welding flange products to purchase, but also with you for the inspection plant. If you have any questions about the purchase of flange, you can contact us at any time.

Metleader Inc. is looking forward to your consultation and welcome to your visit.

Different of weld neck flange and slip on flange has some type:process flow,welding methods,form.
The weld neck flange is the pipe end and the wall thickness of the interface end, which are welded like two pipes, just like the pipes to be welded.
The slip on flange is a concave table which is slightly larger than the outer diameter of the pipe at the interface, and the pipe is welded inside.
Butt welding has better welding performance and less corrosion.

Slip on flange and weld neck flange are the welding methods of flange and pipe connection. When welding flanges, only one side welding does not need the inner mouth of the welded pipe and flange. The welding and installation of the welding flange requires double side welding of flange.
So slip on flanges are generally used for low and medium pressure pipes. Welding flanges are used to connect to middle and high pressure pipes. The flange of the butt welding is at least PN2.5MPa. The welding is used to reduce the stress concentration. The general welding flange is mostly called the neck flange and the nipple flange. Therefore, the installation cost, labor cost and auxiliary material cost of welding flange should be high, because more than one process.
The welding neck flange is not all both inside and outside welding, there is no special requirement in general and just outside welding, did not see the 1/2 “welding flange:”), the flat welding is better welding, because the pipe and flange good vertical, pipe will not slanting.