Pipe Weight Chart and Calculation

A pipe weight chart is a helpful tool because it shows the details of one material according to one unit system. This calculation requires only two numbers and works for different sizes, types, and alloys, which makes the piece of information more useful than a table once we stop dealing with carbon steel. The weight is significant when it comes to transportation costs, support arrangements, lifting projects, as well as marking the place at which wall thickness calculations turn into tonnage of a long pipe. Ranges are underpipes and tubes.

The Formula

For carbon steel pipe, in kilograms per metre:

W = 0.02466 × (D − t) × t

where D is the outside diameter in millimetres and t is the wall thickness in millimetres.

The constant carries the density of steel, so the mean diameter multiplied by the wall gives the cross sectional area of metal, and the constant converts that to mass per metre.

For NPS 6 Schedule 40, outside diameter 168.3 mm and wall 7.11 mm:

W = 0.02466 × (168.3 − 7.11) × 7.11 = 28.3 kg/m

Carbon Steel Pipe Weight, kg per metre

Calculated from ASME B36.10M dimensions:

NPS	OD, mm	Sch 40	Sch 80	Sch 160
1/2	21.3	1.27	1.62	1.95
3/4	26.7	1.69	2.20	2.90
1	33.4	2.50	3.24	4.24
1 1/2	48.3	4.05	5.41	7.25
2	60.3	5.44	7.48	11.11
3	88.9	11.29	15.27	21.35
4	114.3	16.07	22.32	33.54
6	168.3	28.26	42.56	67.56
8	219.1	42.55	64.64	111.27
10	273.0	60.29	95.97	172.26
12	323.8	79.70	132.04	238.68
16	406.4	123.30	203.53	365.36
20	508.0	183.42	311.17	564.81
24	610.0	255.41	442.08	808.22

The wall thicknesses behind these figures, and the STD and XS designations that diverge from schedules on large bore, are in thepipe schedule guide.

Converting for Other Alloys

Multiply the steel figure by the density ratio. Approximate densities:

Material	Density, kg/m3	Multiplier against carbon steel
Carbon and alloy steel	7,850	1.00
Austenitic stainless, 304 and 316	about 8,000	about 1.02
Duplex and super duplex	about 7,800	about 0.99
Copper nickel 90/10	about 8,900	about 1.13
Copper nickel 70/30	about 8,950	about 1.14
Titanium Grade 2	about 4,510	about 0.57
Alloy 625	about 8,440	about 1.08
Monel 400	about 8,800	about 1.12

Densities are nominal values for estimating. For a lifting calculation or a certified weight, use the figure for the actual material.

Titanium is the one worth noticing. At roughly 57% of the density of steel it changes the weight of a system substantially, which is part of its case in offshore and desalination work alongside its corrosion behaviour.

Where Weight Becomes a Decision

Wall thickness on long lines. At NPS 20, an extra millimetre of wall adds roughly 12.5 kg per metre. Over 50 km that is about 625 tonnes, which is why wall optimisation on transmission lines is a tonnage exercise rather than a detail. SeeAPI 5L X60.

Offshore and topsides. Weight is paid for twice, once in the structure that carries it and once in the lift that installs it, which is why a higher strength alloy allowing a thinner wall can be cheaper installed than a cheaper material at a heavier wall. Seemarine and offshore.

Supports and spans. Support spacing follows weight including contents and insulation, so a material change alters the support design.

Freight and handling. Container and trailer limits are weight limits before they are volume limits on heavy wall pipe, and a load that is within length may be over weight.

Contents and Insulation

The formula gives the metal only. For a support or a lifting calculation, add:

Water fill, which for test conditions is usually the governing case
Process fluid at operating density
Insulation and cladding, which on a large bore hot line is not negligible
Coating and lining, which on a lined line can be a significant fraction

A hydrotest fills a line with water, so the test condition frequently sets the support design rather than the operating condition.

What to State on the Enquiry

Size and schedule, or size and wall where the wall came from a calculation
Material, since the density multiplier changes the delivered weight
Length required, random or fixed
Whether a certified weight is required for a lifting plan
The heaviest and longest single piece, since that drives the trailer and the lift

Pipe Weight FAQ

What is the pipe weight formula?

For carbon steel, weight in kilograms per metre equals 0.02466 times (outside diameter minus wall) times wall, with both dimensions in millimetres.

How is the weight converted for stainless or copper nickel?

Multiply the steel figure by the density ratio. Austenitic stainless is about 1.02 times, copper nickel 90/10 about 1.13 times and titanium about 0.57 times carbon steel.

Why is titanium's weight significant?

At roughly 57% of the density of steel it changes system weight substantially, which forms part of its case offshore and in desalination alongside its corrosion behaviour.

How much does one millimetre of wall add on a large line?

At NPS 20 it adds roughly 12.5 kg per metre, which is about 625 tonnes over 50 km, so wall optimisation on transmission lines is a tonnage exercise.

Does the formula include the contents?

No, it gives the metal only. Support and lifting calculations need water fill, process fluid, insulation and any lining added, and the hydrotest case often governs.

Are the density figures suitable for a lifting plan?

They are nominal values for estimating. A lifting plan or a certified weight should use the figure for the actual material supplied.

Applying This to an Enquiry

Send the size, schedule or wall, material and the longest single piece. The last of those decides the trailer and the lift, and it is the item most often discovered after the material has already shipped.

Quotations are available in USD, OMR, AED, SAR, QAR, KWD and BHD, on EXW, FOB, CFR or CIF terms, with EN 10204 3.1 certificates as standard and 3.2 on request. Lead time is confirmed at quotation.

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Pipe Weight: One Formula, Any Size, Any Alloy