For ordering steel pipes, the necessary pipe dimensions is diameter, wall thickness and length. There are various methods to describe the diameter and wall thickness, here I will introduce you some commonly used type.

Steel Pipe Diameters

For the pipe diameter, there are mainly three ways to describe it.

NPS. NPS means Nominal Pipe Size, a North American standard set of pipe sizes for high or low pressure and temperatures application. The diameter is specified with inches such as NPS 8 pipe means the diameter of pipe is 8 inches. It is used more than the actual size of the pipe as a way to distinguish pipes from each other and name them. NPS is often incorrectly called national pipe size, due to confusion with national pipe thread NPT.

DN: DN is METRIC equivalent to NPS, it is popular in European and international. Its designations conform to International Standard Organization (ISO) usage. DN and NPS can be converted to each other. For example, DN40 = NPS 1 1/2, DN 100 = NPS 4.

OD: That means Outside Diameter of the pipe and is fixed for a given size. Pipes in OD is often described in mm, such as OD108mm. The NPS is very loosely related to the OD in inches, only for NPS 1/8 to NPS 12. For NPS 14 and larger, it is equal to OD in inches.

The steel pipe diameter is avaliable in 1/8 inch to 48 inch (DN6 to DN1200).

Wall Thickness of Pipes

For the wall thickness, schedule and mm （millimeter） are very popular unit.

Pipe schedule is the term used to describe the thickness of a pipe. The outside diameter of a pipe is the same for all schedules in a particular nominal pipe diameter. There are 14 schedule numbers commonly used: Sch5, Sch10, Sch20, Sch30, Sch STD, Sch40, Sch60, Sch XS, Sch80, Sch100, Sch120, Sch140, Sch160 and Sch XXS. The most popular schedule is Sch40.

The schedule number is defined as the approximate value of the expression:

Schedule Number= 1000 P/S

• P = the internal working pressure, psig
• S = the allowable stress (psi) for the material of construction at the conditions of use.

Millimeter is intuitively reflect the thickness of pipe wall. It Can be used with NPS, DN or OD.

Wall thickness range for steel pipe is Sch 5 to Sch XXS.

Pipe Length

The pipe length is usually expressed in inches, meter or millimeter. Such as L=6m. Pipe length is available in Single Random, Double Random or Cut Length.

Therefore, the description of pipe dimensions can be DN40 Sch 40 x 6m Pipe.

Steel Pipe Manufacturer

What’s more, materials are also important for ordering pipes. The common grades for stainless steel pipes are SS 304, SS316, for carbon steel pipes are API 5LB, A106, A105, A234 WPB.

Zizi is China leading manufacturer for steel pipes, we supply stainless steel pipe, carbon steel pipe, duplex steel pipe, alloy steel pipe in customized dimensions.

Sch 40 Steel Pipe Dimension Chart

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Zizi is manufacturer, supplier and stockist of steel pipes, we offers different types stainless steel pipe in various dimensions have a large inventory.

Stainless steel pipes is indispensable and widely used type in process industries. It contains chromium which offers it great resistance to various corrosion like seawater and acidic substance.

Types of Stainless Steel Pipe

Based on microstructure, stainless steel pipe can be:

1. Austenitic Stainless Steel Pipe

There are two subgroups of Austenitic stainless steel: 300 Series and 200 Series.

Most common grades are 304, 316,309,310

2. Ferritic Stainless Steel Pipe

It is high chromium, magnetic stainless steel pipe with low carbon content. The common used type are 406, 410L, 430, 439, 441, 434, 436, 444, 445, 446, 447

3. Martensitic Stainless Steel Pipe

They are usually used in mechanical properties or wear resistance applications. The commonly used grades are Type 431, EN1.4313, Type 630.

4. Duplex / Super Duplex Stainless Steel Pipe

It is also a family of stainless steel. It consists of two phases—austenite and ferrite. They are usually divided into three groups based on their pitting corrosion resistance. The commonly types are UNS S32304, 32205, 32750, 32520, 32760.

Seamless Pipe and Welded Pipe

Differ from the manufacture methods, the most prominent type in industry are seamless pipe and welded pipe.

Seamless(SMLS) pipe begins as a billet (which is a solid cylindrical hunk of stainless steel).  The billet will be formed into hollow billet while still hot. Then rolling and stretching into certain sizes. Generally speaking stainless steel seamless pipe do not need heat treatment.

Welded pipe begins as a metal strip called skelp, the skelp will be cut and rolled into shape. Welded pipe usually need heat treatment after manufacture. The advantages of ERW welded pipe is the seam is nearly can’t seen.

We usually seen welded pipe are weaker due to thee seam it has. However, the enhanced manufacture technique allows it performs as desire. And seamless pipe also has its own weakness that the wall thickness could be inconsistent after rolling and stretching.

Line Pipe Dimensions

Stainless steel pipe supplier Zizi supplies steel pipes in following ranges:

Standard: ASTM A312, ASTM A790, ASTM A928, ASTM A213, ASTM A269, ASTM A358, ASTM A778 , DIN 1850, DIN 17457, DIN 17458, EN 10217-7, EN 10357, EN-10296-2

Diameter: 1/8″ to 4″

Wall Thickness: Sch 5S, Sch10S, Sch20, STD, Sch40, XS, Sch80, Sch120, Sch160, XXS.

Length: Cut Length, Single Random, Double Random.

Pipe Type: Seamless, ERW, SSAW, LSAW

End Type: Plain End, Beveled End, Screw End.

Coating: FBE, 2LPE, 3LPE, as requirement.

Those dimensions are necessary for pipe ordering and manufacturing .

Pipe Prices and Weight

According to the kilogram price of stainless steel and the total weight of pipes we calculate the total price.

The total weight of steel pipe is based on their diameter, thickness, length and quantity.

Weight Formula of Steel Pipes:

Weight (Kg/m) = (OD-THK)*THK*0.02466 (CS) or 0.02491 (SS)

• OD is the outside diameter
• THK means the wall thickness.

High Quality Steel Pipe Supplier

High quality stainless steel supplier Zizi puts large attention to the quality control. Quality is the key to obtain customers’ satisfaction.

We are ISO certificate steel pipe supplier and we gain the certifications of ABS, LR, API, CE and so on. Our employees adhere to and contribute to  our quality system in every aspect of our business. From row materials purchasing to the package, we have executive standard and strict execute it.

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