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Know More About Flanges Before Contacting A Flanges Supplier

Jun 19, 2017
Before contacting a Flanges Supplier, you might want to understand more what flanges are, its classifications and features, it is for you to find the right one that will suit your need. There are several Flanges Supplier that you may see out in the market but make sure that they passed worldwide standards. You should check out for API Flanges Supplier and ASME Flanges Supplier.
Classification of Flanges

1. By materials: carbon steel flanges, cast steel flanges, alloy steel flanges, stainless steel flanges, copper flanges, aluminum flanges, plastic flanges, PPC flanges and so on.
2. By manufacturing method: push flanges, pressed flanges, forged flanges, casting flanges and so on.
3. By standard: national standard flanges, API Flanges, ASME Flanges
 
Features of flanges

Flanges can withstand great pressure and it is easy to use. In industrial pipeline, flanges connection has got wide application. So, if you are in a boiler room or production site, you will see flanged pipes and equipment scattered everywhere. While in families, however, because of small diameter pipe and low pressure, you can not see flange connection.
 
Flanges, often used to connect joints, has a wide application. Usually, its manufacturing processing is cast molding or forging punching. Nonetheless, casting flange doesn't have uniform and compact inner organization while forged flange will cost a large amount of material and energy consumption. In this case, rolling manufacturing emerged as required, and it can solve all the problems mentioned above. Because the fiber of rolling distributes evenly and metal grain places closely, as well as the low energy consumption, good-quality surface, advanced molding quality, the development of rolling manufacturing is fast.

Differences Between Flat Weld Flanges and Butt Weld Flanges

Because of high production efficiency, easy operation and reasonable price, flat weld flanges and butt weld flanges are most common weld flanges. In most cases, people will choose these two kinds of flanges. But how to distinguish them and what is the difference?
 
First, different material. Flat weld flange use ordinary steel plate as the material while butt weld flange use forged steel for manufacturing.
 
Second, different pressure. Nominal pressure for flat weld flange is between 0.6Mpa to 4MPa. Compared with flat weld flange, nominal pressure for butt weld flange is smaller.
 
Third, different welding connection, and this is the biggest difference. The flat weld flange has a socket RF with the diameter bigger than the pipe, so that the pipe can be inserted and welded inside. The butt weld flange's wall thickness and diameter are required to be the same with the pipe, so that both the inside and outside of the weld seam can be welded up.
 
Fourth, different steel degree. Flat weld flange has bigger steel degree than butt weld flange. But when it comes to strength, butt weld flange is higher with less leakage problem.

Measurement Methods of Carbon Steel Flanges
With the rapid development of long-distance pipeline construction at home and abroad, pipeline pressure test has become indispensable and important. Before and after the pressure test, cleaning must be done on each pipelines, usually the number is 4 to 5 times. Especially after the pressure test, it will become difficult to clean out the water in the pipeline, so the cleaning number should be increased. Using repeated welding head method may have these following problems: first, it will increase the labor intensity; second, large material consumption and high cost.
 
Before measuring, there should have some preparatory works. Measurement methods of carbon steel flanges should be determined on specific circumstances so as to ensure the accuracy of measurement.
 
Here are some measurement methods of carbon steel flanges: 

1. When measuring, two people should do the measure work while another person proofread and fill in a form. You can use a Vernier caliper to do the measurement, or use outside calipers and steel ruler instead. Measurement is a painstaking work, therefore, measurement and recording must be completely correct and it is not allowed to have any mistakes when filling the form.
 
2. During installation, carbon steel flanges with different outside diameters may need different thickness gaskets, so the processed-out-fixture shall correspond to the carbon steel flanges. Therefore, measuring the size and number of each part is a key to fixture process and installation.

For a good Flanges Supplier, you may see this link, http://gerabgroup.com/products-flanges.htm
They are a Supplier of a wide range of ASME flanges in class 150 to 2500 and API flanges in class 2000 to 20000. Flanges such as swivel, orifice assembly, anchor and long weld-neck flanges in standard dimensions can also be supplied.
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