Pipe Price & Weight Table: A Guide to Diameter and Schedule

Short answer: When reading a pipe price table, do not look only at the number “۲ inches” or “۴ inches.” To arrive at a comparable pipe price, the actual price depends on nominal size, outside diameter, thickness or Schedule, pipe type, grade, length of each piece, and weight. The table below shows the approximate weight of carbon steel pipe in common sizes and two grades, Schedule 40 and 80. The figures are for initial estimates; in bulk purchases, the mill certificate and weighbridge measurement are the final basis.

Steel Pipe Weight Table; Common Sizes from ۱/۲ to ۱۲ inches

This table has been prepared for steel pipes with common dimensions in the ASME B36.10 dimensional family. Outside diameter and thickness are nominal values, and weight has been calculated using the approximate density of steel and the cross-sectional area formula. Actual weight may vary slightly due to production tolerances, alloy density, coating, and the actual length of each piece.

Important note: This table is “complete,” but its completeness is meaningful within the range of common sizes from ۱/۲ to ۱۲ inches and the two specified grades. For larger sizes, other grades, stainless steel pipe, or pipes with different dimensional standards, the table for that specific product should be reviewed separately.

What Is the Largest Pipe Size in Iran and China?

For an industrial customer, a single table stating that “this is the largest pipe size” is not accurate. The production limit depends on the manufacturing method, mill, standard, thickness, and project order. In Iran, stated ranges of up to ۱۲۰ inches exist for large-diameter spiral and welded pipes; in China, SSAW pipe manufacturers have also announced ranges up to a diameter of ۲۵۴۰ millimeters, equivalent to approximately ۱۰۰ inches. These figures do not mean permanent warehouse inventory or that all sizes are available for supply at any given time; for purchasing, production availability and delivery time must be confirmed.

How Should We Use the Pipe Weight Table?

If, for example, you need a ۴-inch Schedule 40 pipe with a ۶-meter piece, the table shows that the weight per meter is approximately ۱۶٫۰۷ kilograms and the approximate weight of each piece is ۹۶٫۴۲ kilograms. If you need ۲۰ pieces, the theoretical order weight will be approximately ۱٬۹۲۸ kilograms. To estimate the amount, this figure is multiplied by the rate per kilogram; however, tax, freight, cutting, coating, and delivery location may be calculated separately.

If the piece length is ۱۲ meters, the piece weight is approximately twice the ۶-meter table value. Therefore, when comparing two pro forma invoices, first make the piece length and price unit the same. A pipe price stated “per piece” is not sufficient for comparison without knowing the length and weight.

What Is the Difference Between Nominal Diameter, Outside Diameter, and Inside Diameter?

Nominal size, or NPS, is a standard designation and is not necessarily equal to the actual pipe diameter. For example, NPS 2, or the ۲-inch pipe, in this dimensional family has an outside diameter of ۶۰٫۳ millimeters, not ۵۰٫۸ millimeters. DN also expresses the metric nominal size and should not be assumed to be exactly equivalent to the inside or outside diameter without considering the standard.

The inside diameter can be approximately obtained from the relation ID = OD − 2t. For a ۲-inch Schedule 40 pipe, the approximate inside diameter is ۵۲٫۴۸ millimeters; in Schedule 80, this figure reaches approximately ۴۹٫۲۲ millimeters. In detailed design, tolerance, corrosion, coating, and project requirements must also be reviewed.

What Effect Does Wall Thickness Have on Weight and Price?

Thickness is the distance between the inner and outer surfaces of the pipe wall. When the outside diameter is constant, increasing the thickness consumes more metal; as a result, the weight per meter increases and the inside diameter decreases. This is why a ۲-inch Schedule 80 pipe, despite having the same outside diameter, is heavier than Schedule 40.

Greater thickness is not always the better choice. Thickness must follow the fluid pressure and temperature, corrosion, connection type, manufacturing method, and project design code. For engineering selection, simply being heavier is not a sufficient criterion.

What Is Pipe Schedule or Grade?

Schedule is a dimensional numbering system that connects a pipe’s nominal size with specified thicknesses. At a fixed nominal size, a higher Schedule generally means a thicker wall, greater weight, and smaller inside diameter. However, Schedule alone does not specify the permissible pressure.

For example, in the table above, the thickness of the ۲-inch pipe increases from ۳٫۹۱ millimeters in Schedule 40 to ۵٫۵۴ millimeters in Schedule 80. This comparison concerns dimensions and weight only. Permissible pressure depends on material, grade, temperature, corrosion, connection, and design code and must be checked by a qualified person. For stainless steel, the ASME B36.19 table should be considered separately from the carbon steel table.

Pipe Weight Calculation Formula

For estimating the linear weight of steel pipe, the following approximate formula can be used:

Weight per meter (kg/m) ≈ ۰٫۰۲۴۶۶ × thickness (mm) × [outside diameter (mm) − thickness (mm)]

Then:

Piece weight = weight per meter × piece length

This formula is for geometric estimation. Weighbridge weight may differ slightly due to dimensional tolerances, actual length, coating, and differences in density. If the price is based on actual weight, clarify the weighing method and settlement basis before purchasing.

Meaning of the Columns in a Pipe Price Table

Pipe Price Inquiry Checklist

To prevent a seller from pricing two different products under a similar description, send the following information together:

• Pipe type: welded, seamless, galvanized, or stainless steel
• Nominal size or DN and, if required, outside diameter
• Thickness or Schedule
• Product grade and standard
• Piece length and required quantity
• Mill or brand, loading location, and delivery location
• Price unit and whether tax, testing, coating, cutting, and transportation are included in the price
• Weight basis: table, mill certificate, or weighbridge
• Price validity date and time

To view the daily rate and compare pipe prices, visit the Ahantime pipe price page. For initial calculation checks, the pipe weight calculation tool is also useful; the tool’s result does not replace a technical certificate or weighbridge measurement.

Frequently Asked Questions

How Is the Weight of a ۶-Meter Pipe Calculated?

Multiply the weight per meter by ۶. For example, a ۲-inch Schedule 40 pipe with an approximate weight of ۵٫۴۴ kilograms per meter weighs approximately ۳۲٫۶۴ kilograms in a ۶-meter piece.

Is Schedule 80 Always Suitable for Higher Pressure?

Not automatically. Schedule 80 has a thicker wall, but permissible pressure also depends on material, grade, temperature, corrosion, connection, and design code.

Why Does the Table Weight Not Match the Weighbridge Weight?

Thickness and diameter tolerances, the actual length of the piece, coating, rounding of figures, and differences in density can create a discrepancy. Specify the settlement basis before purchasing.

Is Nominal Diameter the Same as Outside Diameter?

No. For example, the outside diameter of NPS 2 in this table is ۶۰٫۳ millimeters. When ordering, write the nominal size, outside diameter, and thickness separately.

Can the Same Table Be Used for Stainless Steel Pipe?

Not without review. Stainless steel pipe has a separate dimensional table and standard conditions and must be checked against ASME B36.19 or the technical specifications of the same product.

Conclusion

A pipe weight table is useful for purchasing when it is read together with outside diameter, thickness, Schedule, piece length, steel type, grade, standard, and price unit. Use the table for an initial estimate, but base bulk orders on actual weight, the product certificate, and settlement terms. If any of this information is missing from the pro forma invoice, the price comparison is not yet reliable.

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