How Is The Steel Pipe Size Series Determined?

Pipe sizes are not arbitrarily determined and should follow a specific size system. Steel Pipes are sized in millimeters, although some countries use inches (English inch, or German zoll). Therefore, there are two sets of steel tubes - TUBE and PIPE.

TUBE is used in the mechanical or energy industry to describe the outside diameter in dimensions and inches. PIPE is used as a pipeline for different media. The PIPE size is used as the nominal size of the steel pipe. A 12-inch steel pipe can also find an approximate internal diameter.

The Thick Steel Wall series comes from the British metrology unit and uses the score to express the size. The PIPE wall thickness consists of the Schedule series (40, 60, 80, 120) and is connected to the weight series (STD, XS, XXS). These values are converted to millimeters as part of the tube wall thickness series. (Note: Size - the value of Schedule40 is not constant, but depends on the outer diameter of the tube.

For TUBE type wall thickness values use BWG, SWG scale. After conversion to millimeters, these values become part of the thick wall series of steel pipes. Precision steel pipes for use in Europe and in the International System of Units are rounded to approximate outer diameter and wall thickness dimensions.

Steel tube ellipticity

Ellipticity is the difference between the minimum and maximum outer diameter values of a section. The ellipticity must be within the outer diameter tolerance.

Ellipticity = External view maximum value - External view minimum value (mm absolute value) O = ODmax – ODmin (absolute value in mm)

Ellipticity = 100x (outer view maximum - outer diameter minimum) / outer diameter (use %) O = 100. (ODmax – ODmin) / OD (in %)

 

Steel pipe eccentricity

(Average deviation) is the difference between the intermediate value of the outer diameter and the inner diameter. The eccentricity must be within the thick wall tolerance, and the eccentricity can be calculated in a long cross section:(thick wall maximum - thick wall minimum) / 2 (in millimeters absolute) (WTmax – WTmin) / 2 (absolute value in mm)

(thick wall maximum - thick wall minimum) / ((thick wall maximum + thick wall minimum) x 100 (with %) (WTmax - WTmin) / (WTmax + WTmin).100 (in %).

Pipe fittings Production Base - Yanshan County

Pipe fittings Production Base - Yanshan County

Yanshan County is located in the southeast of Cangzhou City, Hebei Province, bordering east of the Bohai Sea, Beijing and Tianjin in the north, south to Shandong. It is the center of “three cities” (Cangzhou, Dezhou, Binzhou) and “two provinces” (Hebei, Shandong). It is known as the “Jinlu Hub” and the “Beijing-Tianjin Gateway”. It is 120 kilometers from Tianjin, 220 kilometers from Beijing, 160 kilometers from Jinan, 50 kilometers from Huanghua Port and 110 kilometers from Tianjin Port. It can go out to sea in half an hour and can board the plane in one hour.

Yanshan County has a long history and is known as Rao. In the five years of Han Gaozu (202 BC), Gaocheng County was set up, and the Emperor Wendi renamed Yanshan County in 598. Yanshan has deep cultural heritage, rich cultural resources and distinctive cultural characteristics. It forms the “six cultural sections” of Phoenix culture, Qiantong culture, ancient city culture, red culture, celebrity culture and pipeline culture.

According to the historical documents such as "Road History ", "Emperor Century", "Picking the Legacy" and other records: "in the period of The Emperor of the Three Emperors and Five Emperors , Shaohao Emperor was born in the wilderness of the Zhihua(Yanshan), when there were five phoenixes, so named the phoenix birds "." Thus, Yanshan was also known as "Phoenix City" in ancient times. In 209 BC, Qin Fangshi Xu Fu under the commands of Qin Shihuang, recruited thousands of boys and girls, a hundred workers and warriors. After training in Yanshan, they succeeded in crossing Fusang (Japan), it was the first time to open the cultural exchange between China and Japan. Yanshan is known as the "home town of thousands of children" and "the first hometown of Chinese history".

Yanshan has six major industries, including pipeline equipment manufacturing, sports equipment manufacturing, machine tool accessories manufacturing, transportation machinery manufacturing, stainless steel furnace material purchase and sale processing and socks processing. Among them, the pipeline equipment manufacturing industry is the pillar industry of the county. It has a history of more than 30 years. After careful cultivation by the county committees and governments, it has become a well-known key industrial cluster in the province. Yanshan County is named as “Hebei Province's Characteristic Industry County”, “Hebei Province Characteristic Industry Base”, “Hebei Province Key Export Cluster Area” by the relevant provincial departments, identified as a provincial economic development zone by the provincial government; it was also named as “China Pipeline Equipment Manufacturing Base” by China Equipment Management Association. Named "China Pipeline Pipe Fittings Export Base" by China Minmetals Chamber of Commerce, it was recognized by the Ministry of Industry and Information Technology as "National New Industrialization Industry Demonstration Base".

Our company -WH-STEEL is located in Yanshan County, it is a professional company about pipe fittings equipment products gathering R&D, production and operating in integral whole. Our company's main pipe fittings are flanges, elbows, tees, carbon steel bends, reducers, caps, barred tees and other pipe fittings, Forge Fitting.

Contact us：E-mail: sales@whsteelfittings.com, our website: http://www.whsteelfittings.com

China factory Manufacturer Pipe Fitting

We are Manufacturer in China.Our main pipe fittings are flanges, elbows, tees, carbon steel bends, reducers, caps, barred tees and other pipe fittings.

Good quality.Welcome send inquiry inbox us!

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How to choose a pipe fittings manufacturer?

How to choose a pipe fittings manufacturer?

Pipe fittings can be used in many fields, such as garbage disposal, water treatment plants, petrochemical pipelines, etc., the scope of application is still very wide. Internationally, the production of pipe fittings has certain standards, so the choice of the manufacturer may not know how to choose.

 

We are WH-steel. WH-STEEL is located in Yanshan County, Cangzhou city, Hebei Province, which is the manufacturing base for pipe equipment in China. It is a professional company about pipe fittings equipment products gathering R&D, production and operating in integral whole.

Our company's main pipe fittings are flanges, elbows, tees, carbon steel bends, reducers, caps, barred tees and other pipe fittings, product materials (A234 - WPB WP5, WP9, WP11, WP22, A420 - WPL3 / WPL6, A403 - WP304 / L; WP316 / L, A860-WPHY 42-46 / 52-60 / 65-70). Special materials such as Monel, Inconel, Cu-Ni, Duplex SS are available upon request.

 

Our company has compete production qualifications. Since 2000, we have taken the lead in obtaining certification of ISO quality management systems, API Certificate, classification society certification, pressure vessel production license and special equipment testing certification. We have already become the qualified supplier for China National Petroleum Corporation, LUKOIL of Russia Oil and National Electricity. Our company is given the title of “faithful supplier” by the Municipal Administration for Industry and Commerce.

Contact：E-mail: sales@whsteelfittings.com,  our website: http://www.whsteelfittings.com 

China factory Manufacturer Pipe Fitting

We are Manufacturer in China.Our main pipe fittings are flanges, elbows, tees, carbon steel bends, reducers, caps, barred tees and other pipe fittings.

Good quality.Welcome send inquiry inbox us!

Our facebook page: https://www.facebook.com/whsteelfittings/

Our company website: http://www.whsteelfittings.com

#pipefittings #flanges #elbows #tees #carbon #steebends, #reducers, #caps, #barredtee

WH-STEEL -pipe fittings，flanges, elbows, tees, carbon steel bends, reduc...

We are Manufacturer in China.Our main pipe fittings are flanges, elbows, tees, carbon steel bends, reducers, caps, barred tees and other pipe fittings.

Good quality.Welcome send inquiry inbox us!

Our Facebook Page: https://www.facebook.com/whsteelfittings/

#pipefittings #flanges #elbows #tees #carbon #steebends, #reducers, #caps, #barredtee

https://youtu.be/g1AcqQxEMdQ

Classification of elbows

Classification of elbows

Divided by material

Carbon steel: ASTM/ASME A234 WPB, WPC

Alloy: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP911, 15Mo3 15CrMoV, 35CrMoV

Stainless steel: ASTM/ASME A403 WP 304-304L-304H-304LN-304N

ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti

ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H

Low temperature steel: ASTM/ASME A402 WPL3-WPL 6

High Performance Steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70

Cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon leaching, PVC, PPR, RFPP (reinforced polypropylene).

Divided by the production method elbows can be divided into push, press, forge, casting and so on.

Divided by manufacturing standards elbows can be divided into national standard, electric standard, ship standard, chemical standard, water standard, American standard, German standard, Japanese standard, Russian standard and so on.

Divided by its radius of curvature: can be divided into long radius elbows and short radius elbows. The long radius elbow refers to the outer diameter of the tube whose radius of curvature is equal to 1.5 times, that is, R = 1.5D; the short radius elbow refers to its radius of curvature equal to the outer diameter of the tube, that is, R = 1.0D. (D is the elbow diameter and R is the radius of curvature).

If divided according to the pressure level: there are about seventeen kinds, which are the same as the American pipe standards: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, SCH100, Sch120, Sch140, Sch160, XXS; the most commonly used are STD and XS.

According to different shapes and uses, it can be divided into: grooved elbow, ferrule elbow, double bearing elbow, flange elbow, reaming elbow, dull elbow, inner and outer elbow, punching elbow, push Elbows, socket elbows, butt weld elbows, inner wire elbows, etc.

WH-STEEL is located in CangZhou, Hebei province in China, a professional pipe fitting manufacturer.

We have steel bend, elbow fittings, barred tee and other pipe fittings, more can find in our factory, or vist our website : http://www.whsteelfittings.com/

Some Common Problems In the Pipe Fittings Industry

Some Common Problems In the Pipe Fittings Industry

1、Theoretical weight of the elbow

Carbon steel elbow weight = (outer diameter - wall thickness) * wall thickness * 0.02466 * length

1) The outer diameter is not equal to the nominal diameter, which is equal to the outer diameter of the groove of the 2 series.

2) Length = 2πR * Angle / 360, the weight of the elbow is calculated by the length of the arc corresponding to the elbow angle of the circumference of the radius of R.

3) R is the bending radius of the elbow

Example: 90° elbow DN200 PN2.5 R=1.5D

20# GB/T12459-2005

Weight = (219-7) * 7 * 0.02466 * 2 * 3.14 * (1.5 * 200) * 90 / 360 = 17236.445 Also divide by 1000 to get 17.24kg, which is the theoretical weight of the elbow.

2、Cutting length of the Pressing bend and elbow

Cutting length of the Pressing bend and elbow = 2π (R+1/2 outer diameter) * angle / 360 + 10% -20% material

This is to calculate the outer arc length of the elbow, plus some surplus material.

3、Cutting length of the push bend and elbow

Length = 2πR * angle / 360 + 10% -20% of the material, if you bend the pipe, add the length of the straight pipe

4、The difference between cold galvanizing and hot galvanizing

1) The difference between the processes: Hot-dip galvanizing, also known as hot-dip galvanizing, is the process of degreasing, pickling, dipping, drying, and drying the workpiece. The surface is immediately immersed in the molten zinc solution for a certain period of time, forming a layer of zinc coating on the surface of the workpiece. Methods.

Cold galvanizing is also called electro-galvanizing. It is an electrolytic device that removes oil and pickles into a solution containing zinc salt and connects it to the negative electrode of the electrolysis device. A zinc plate is placed on the opposite side of the workpiece to be connected to the electrolysis device. The positive electrode, when the power is turned on, and the current is moved from the positive electrode to the negative electrode, a layer of zinc is deposited on the workpiece.

2) The difference between the finished products:

The hot-dip galvanized surface is not as cold and galvanized, but the thickness of the zinc layer is several times that of cold-galvanizing. Corrosion resistance is also several times that of electroplating. There are blue ink-printed hoops at both ends of the hot-dip galvanized steel pipe. The whole body has the standard and specification models; there is a zinc needle or a little tumor hanging at one end of the hot-dip galvanized steel pipe, and there is a complete galvanized layer inside and outside, and the appearance is not cold. The galvanizing is smooth; the cold galvanized coating is bright, and the light is bright at a certain angle with the sun. The cold-plated steel pipe has only a little zinc layer at both ends, and there is no galvanized layer in the inside, and the cold-galvanized domestic steel pipe.The ends are as smooth as there is absolutely no zinc tumor. There are no standards for execution. Cold-galvanized steel pipes look brighter and smoother.

Know more about supply and manufacture of pipe fittings, please vist our website : http://www.whsteelfittings.com/

We have steel bend, elbow fitting, barred tee and reducer etc, more can find in our factory.