How to find out the weight of a pipe in a meter. Profile pipe calculator - quick weight calculation

Pipes can be electrically welded and seamless, round, water and gas, or shaped. Determine the type pipes... Refine it outside diameter and wall thickness in mm. Measure the length of one pipes in meters and the number of pipes in the order.

Find in the handbook of theoretical weights of steel pipes of the corresponding GOST type and design mass one running meter pipes the desired diameter and wall thickness. Multiplying the mass running meter by length pipes, get the weight of one pipes in kilograms. Calculate the total weight of the order by multiplying the weight 1 pipes on their quantity in the order.

Calculate in a similar way the weight of the polyethylene pipes, knowing its type, diameter, wall thickness and length. Use the GOST reference data for polyethylene pipes for calculations. To determine the weight of one running meter of polyethylene pipes according to the reference book, you need to calculate the SDR or standard dimensional ratio.

Divide the size of the diameter of the polyethylene pipes to the thickness of its wall. This will find the SDR in mm. Knowing the standard dimensional ratio, find the calculated mass running meter pipes the desired diameter. Next, calculate the weight of the desired segment pipes or the whole bay by multiplying mass running meter pipes to its length.

Usually the pipe is in the form of a hollow cylinder, so its mass depends on the wall thickness, material of manufacture and length. If these parameters are given in the conditions of the problem, its solution will be reduced to finding a formula in a general form, substituting the values \u200b\u200bof variables and calculating the result. For practical calculations of the mass of a pipe as an industrial product, the values \u200b\u200bof the variables can be found from the regulatory documents - GOST.

Instructions

To draw up a formula for calculating the mass of a pipe, you need to know the cross-sectional area of \u200b\u200ba hollow cylinder. To do this, the wall thickness (a) must be known. If in the conditions of the problem it is not, but the inner (d) and outer (D) diameters are given, express the wall thickness in terms of half the difference between these values: a \u003d (D-d) / 2. Determine the cross-sectional area as the difference between the product of the outer diameter and the wall thickness and the square of the wall thickness multiplied by the number Pi: \u200b\u200bπ * (D * a-a²).

Using the area formula, determine the volume enclosed between the outer and inner walls - multiply the formula obtained in the previous step by the length (L) of the pipe: π * (D * a-a²) * L.

Substitute the values \u200b\u200bgiven in the conditions of the problem into the formula and calculate the result. In this case, take into account the dimension of the original values. Let's say the outer diameter steel pipe is 30 cm, the wall thickness is 5 mm, the length is 4 m, and the density of steel is 7.95 g / cm³. In this case, you can substitute all the values \u200b\u200bin centimeters into the formula, get the result in grams and convert it into kilograms: 3.14 * (30 * 0.5-0.5²) * 400 * 7.95 \u003d 3.14 * 14, 75 * 400 * 7.95 \u003d 147281.7 g ≈ 147.3 kg.

For practical calculations, use the markings on the pipes or on the accompanying documents to determine the values \u200b\u200bof the variables to be substituted into the formula. Knowing it, you can determine the required values \u200b\u200baccording to regulatory documents - GOSTs. For example, the density of steel pipes can be found from GOST 9941-8, and the density of plastic pipes is given in GOST 18599-2001.

Sources:

• Online calculator
• how to calculate pipe weight

The need to determine diameter pipes often occurs when replacing sewer pipes, selecting a heated towel rail and other household chores. You can determine it yourself, for this you only need a tape measure or a caliper.

You will need

• - pipe;
• - roulette;
• - vernier caliper;
• - ruler.

Instructions

Measure with a tape measure or a centimeter tape the circumference pipes, to do this, wrap it around and look at the value on the scale. Next, divide the resulting value by pi, which is 3.1415. As a result, you will receive an external diameter pipes.

If you have a vernier caliper, you can measure the external diameter directly (for pipes up to 15 cm). To do this, grasp the pipe with the jaws of the tool and look on the double scale how many centimeters are diameter.

To find out the inner diameter, measure the wall thickness at the cut pipes... Take measurements with a ruler or vernier caliper (the second method is, of course, more accurate). Subtract from the outside diameterand the wall thickness multiplied by two - the resulting number is the internal diameter.

When choosing a heated towel rail or other work in which you need to find out diameter standard tap pipesheld at your home, use the following in a simple way... Apply a ruler to the pipe and estimate its approximate diameter... If you can see by eye that the pipe is about 32 cm wide - feel free to conclude that the landing diameter its 1 inch. The 25-28 cm size corresponds to a standard ¾ "pipe, and the 16 mm size corresponds to 1.2".

note

When designating rolled metal pipes, for example, pipes for metal structures or stainless pipes, the outer diameter and wall thickness are used. For example, a record looks like this: 530x12. For water and gas pipes great importance has an inner diameter, so they are designated, for example, 15x2 (at first glance, exactly the same). To determine which pipe is in front of you, look at GOST. Water and gas pipes (VGP) are made in accordance with GOST 3262.

Exact quantity calculation concrete, which is to be laid in the formwork - one of the conditions for the correct implementation construction works... Excess concrete, as a rule, has nowhere to use. The mixer will either take the ordered and prepaid concrete, or dump it to the specified place, creating a "monument" to your bungling. Violation of construction technology due to lack of concrete will lead to even more serious consequences. Let's consider an example strip foundationhow to avoid such mistakes.

You will need

• - ruler,
• - roulette,
• - calculator.

Instructions

Commodity concrete of various grades, which is a semi-liquid mass, depending on its composition, has unequal shrinkage - the less cement and water it contains, the more insignificant the changes in volume a concrete when hardening. In addition, by the amount of shrinkage concrete other factors also affect, for example, the method of its compaction: when bayonetting with a shovel, shrinkage is less than when compaction concrete deep vibrator. When calculating the required amount concrete usually use a single average coefficient of shrinkage, equal to 1.015-1.02.

Calculate the volume of the concrete structure in advance, according to the project (sketch). To do this, you need to multiply the width, height and length of the foundation.

After the construction of the formwork, check that the height, width and length of the foundation match the design values. Small deviations in size in a large direction lead to a significant increase in the required amount concrete... The use of inventory formwork made of steel frames and moisture-resistant plywood makes it possible to minimize these errors.

Multiply the resulting volume by the shrinkage factor.

Subtract the volume of all openings and niches for utility networks (pipes, ducts) from the obtained value. To do this, you need to calculate the corresponding volumes according to the formulas for determining the volume of a cylinder (area of \u200b\u200ba circle multiply the height) or a parallelepiped (length multiplied by width and height). The resulting value will be the one quantity concrete, which is necessary to fill this structure.

note

In order to avoid errors in calculations, all measurements (length, width and height of the foundation and openings in it) should be carried out in the same units - meters.

It is very important that in the case of using a plank formwork, it is leveled and rigidly fixed as much as possible, otherwise the formwork can be spread apart from the mass of the poured concrete. Of no small importance is the absence of gaps between the boards through which water will seep when compaction of the poured concrete, which also leads to a change in the shrinkage coefficient upwards.

If you have to bring cold water into the house, it is very important to timely calculate the weight of the pipes, which will become an additional load for the foundation.

1 Why calculate the pipe weight?

You decided to start laying pipes, and you know exactly how many meters you need. It would seem that everything, you can go shopping by attaching a roof rack to your car, or by hiring an open-body truck. And this is where the need for an accurate calculation of the weight of a steel profile pipe comes up, an online calculator at the place of purchase without knowing the formulas will hardly help you. After all, you need to know how many running meters of a pipe of a certain diameter can be loaded into your passenger car, which has a carrying capacity limit.

Weight calculation round pipe

Enter outside diameter

Enter wall thickness

Enter pipe length

In the same way, when hiring a truck, you must be sure that the entire batch of the purchased metal profile will be delivered in one shipment. And this is provided if you pay for the rental of freight transport by the hour. And if you also stipulate tonnage when concluding a contract, all the more, you need to determine in advance how much the pipes that will be purchased weigh. Hence the conclusion - without knowledge of how to calculate the mass of metal in a round or square profile, you cannot do it. Let's take a look at several calculation methods for different cases.

Calculating the weight of a rectangular profile

2

There is rarely any material that can match the strength of steel, which is why pipes made of this metal alloy are given the greatest preference. They are produced and sold in running meters, and in the warehouse you can find round and rectangular profiles, both piecewise and in bundles. It would seem, what else is needed to acquire the required number of pipes? However, it is often very important to know the weight of the purchased material.

The main reasons for this are listed above, now we need to figure out how exactly the mass of different profiles should be calculated. GOST 8732-78 proposes a general method for all types of steel pipes, which differ from each other only in diameters, for which the average density of the metal is taken as 7850 kg / m 3.... To obtain the desired result, use the tables offered in GOST 8732-78 to determine the values \u200b\u200bof the diameter and wall thickness, and then use the formula M \u003d 0.02466. S (D n - S).

Here D n Is the outer diameter, and S - wall thickness of the round profile. However, as already mentioned, this method will give only an approximate calculation of the mass of one running meter of the pipe. You should use it if you have not previously determined the weight of the required profiles and are now hastily calculating it. For a more accurate calculation, there is another formula, for the operation of which we need values \u200b\u200bsuch as the outer and inner diameters, volume, cross-sectional area, metal density.

What is convenient with this method is that it is suitable for both steel pipes and cast iron pipes with copper. The formula itself looks like this: m \u003d pVwhere p Is the density, and V - volume. However, this is just the beginning of the calculations, we need to get the volume. Its we are as follows: V \u003d SL, here S Is the cross-sectional area of \u200b\u200bthe pipe, and L - its length. Moreover, the first value depends on the inner and outer diameters. From here S \u003d π (D 2 - d 2) / 4where D Is the outer diameter, and d - internal, which is not always known to us and is defined as follows: d \u003d D - 2bwhere b - pipe wall thickness.

However, of all the values \u200b\u200bof the above universal formula for round profiles, one thing remains unknown to us, namely, the density of the metal. You can, of course, use the averaged value, as suggested in GOST 8732-78, but then the formula loses all its versatility. Therefore, we will go further and use GOST 1050-88 to obtain the density of steel, GOST 1412-85 for gray cast iron, and so on. We find out that steels 10, 20, 40 and 60 have densities of 7856, 7859, 7850 and 7800 kg / m 3, respectively.

Ductile iron has a density of 7000, high-strength cast iron - 7200. Gray cast iron grades SCH10, SCH20 and SCH30 have a density of 6800, 7100 and 7300, respectively, while copper grades M0, M1, M2 and M3 have a total value of 8940 kg / m 3. To get the correct result in kilograms, all calculations with lengths and other dimensions are usually carried out in meters, since the density values \u200b\u200bare taken in kg / m 3.

3

The above method is only suitable for circular profiles, but what if you need it? There is a separate method for this, however, it also gives only an average result, of course, provided that you use the average value of the density of the metal, namely - 7850 kg / m 3. However, nothing prevents you from applying the density values \u200b\u200bof various alloys and non-ferrous metals that we have already found for the previous formula.

The formula itself looks like this: M P \u003d b. 2 (A + B). ρwhere b - profile wall thickness, A and B - the lengths of the sides, and p - density. You already know how to find the wall thickness of a pipe from a number of formulas given above.
There is another way for which we need a formula for calculating the mass of a circular section profile. Someone will ask: "What does it have to do with it if a diameter is needed for calculations?" However, remember that the basic definition of mass looks like m \u003d pV, that is, we need the density and volume of a pipe made of one or another metal. We have the first value in abundance, you can substitute different values, thanks to all kinds of GOSTs, and the second does not cost anything to get, and not even in one, but in three ways. True, each of the methods will slightly change the pipe calculator, in all three cases the pipe weight will not be the same.

So, let's look at the first way to get volume. First, let's imagine a pipe in the form of a rod. In other words, we need the outer side lengths and the length of the rectangular profile. We multiply these values \u200b\u200band get the total volume of the pipe, in total with the void. Now we need to calculate the volume, so to speak, of the "donut hole", that is, the internal cavity of the profile. We multiply the lengths of the inner sides and the length. Subtract the second result from the first and get the volume of metal contained in the pipe walls. Now, in order to calculate the weight of the pipe, it remains to substitute any density value suitable for the case into the calculator.

The second method is somewhat more complicated, provided that the profile wall has an unequal thickness along the entire perimeter (in a hot-rolled profile), which we need to measure. To do this, we measure one side and multiply the resulting value by the average thickness of this wall. We repeat a similar procedure 3 more times for the other sides. Thus, we get the volumes of the four faces of a rectangular profile, adding them to get the total value. The result of the calculations should be multiplied by the density of the metal from which the pipe is made. The third way is to use the data of the table below, according to which you can find the mass in kilograms:

SideA	SideB	Wall 3	Wall 4	Wall 5	Wall 6	Wall 7	Wall 8	Wall 9	Wall 10

The weight of rolled metal is an important characteristic that plays an important role in the acquisition, transportation and design of structures. The calculator allows you to quickly determine the theoretical mass of pipes.

1 Why it is necessary to determine the weight of shaped pipes

Profile pipes are called pipes that, unlike conventional water pipes, have a non-circular cross section. The most common and demanded is the profile pipe products of rectangular and square cross-section. It is usually used for the manufacture of various kinds of metal structures and their elements in the construction industry and various industrial areas.

First of all, data on the weight of a profile product is required for calculations that are carried out in the design and development of metal structures, as well as for filling in a variety of technical and accounting documentation. It is also necessary to know the mass of rolled products when buying and selling it, since all payments are made, as a rule, for kilograms (tons) and only with rare exceptions for running meters, pieces. Determine how much the transported consignment weighs and is necessary to select a method of transportation and means of delivery of products.

In addition, the market for rolled metal and building materials there are unscrupulous sellers (or suppliers and manufacturers) who try to deceive the consumer by fraudulent means. They can offer substandard, defective, profile pipe products that do not meet the stipulated standards and GOSTs, which are outwardly indistinguishable from high-quality. So, for example, there are frequent cases of attempts to sell products made in China, in which the declared (technologically regulated) wall dimensions (thickness) are present only at the edges, where, in fact, they are checked for compliance with the standard size. And in fact, a pipe of 100x100x5 mm in the middle may have other parameters - 100x100x4 mm. So in the production process, metal is saved, and as a result of the sale, a "body kit" can occur - if the sale takes place by piece or by running meters. The buyer will receive low-quality metal products that are not worth the money spent and can lead to serious negative consequences. This "shortage" is easy to identify if you know the weight that a pipe of given dimensions should have.

2 Methods for determining the weight of a profile pipe

All existing methods for determining the weight of rolled metal without weighing it make it possible to obtain a theoretical value based on the available dimensional characteristics (diameter, width, height, thickness, length). Only weighing will show the exact weight. There are the following ways to determine the theoretical mass:

• using tables for this type of rolled metal;
• using calculator shaped pipe;
• by calculating using a mathematical formula.

In all cases, to determine the weight, the theoretical value of the density of the metal used for (for steel 7850 kg / m 3) is used, as well as standard sizes products provided for by the specifications of GOST.

But there are many different alloys and their actual density always, even if only slightly, differs from the theoretical value. The actual dimensions and shape of a metal product may also not coincide with the tabulated ones within the tolerances regulated by GOST. Therefore, the mass determined by these methods is theoretical.

The tables indicate the weight of 1 running meter of profiled tubular products (in kilograms) for each standard size and the number of meters in 1 ton of the product. To determine the total mass of a batch of rolled metal products, it is necessary to multiply the weight of 1 lm. for the total length of the entire volume of pipes (in meters).

The fastest way to find out the mass of specialized products is with an online calculator. Manually according to formulas - the slowest and less reliable, since in this method there are more opportunities to make any mistake than in the first two (you can use a formula incorrectly or make a mistake when selecting and entering data).

3 Calculation of a profile pipe using an online calculator

Special calculators available on the Internet allow you to quickly calculate the mass of a profile pipe.All that is required for this is to enter the parameters of the rolled metal in the corresponding fields of the calculator:

• side lengths (height and width) of the profile;
• wall thickness;
• pipe length.

Then you need to indicate the grade of steel (alloy) from which the profile product is made, and press the enter button. This will give the theoretical pipe weight. Moreover, the calculators do not calculate the mass of 1 meter of profile products, but immediately substitute standardized table values \u200b\u200bin accordance with the product number. This is a fundamental difference from formula calculations, where this parameter is determined independently. This makes the calculation on the calculator more accurate.

The calculator can be used to calculate pipes made of the following types of metals:

• cast iron;
• become;
• copper;
• bronze;
• aluminum;
• brass;
• titanium;
• magnesium;
• other alloys.

Also, determine the length of the pipe by its weight (the number of meters per 1 kg or ton of the product).

4 Calculation of the weight of a profile pipe according to the formula

The calculation of a profile pipe according to the formula is based on calculating the volume of the metal of the walls of a piece of a product with a length of 1 m.When multiplying this value by the density of the alloy used for the manufacture of rolled products, the theoretical weight of 1 m of the pipe is obtained. By multiplying this weight by the total length of the product, its mass is determined. The formula for calculating 1 m of profile pipe products is as follows: 26.376 * 200 \u003d 5275.2 kg

The theoretical weight of 1 m obtained by the formula differs from the table value taken from GOST - 24.18 kg. This discrepancy is due to the fact that the proposed calculation formula does not take into account the external and internal rounding at the corners of the profile of a real pipe. The calculations were carried out for a product of the correct geometric shape (with right angles), but such products are not actually produced. And the theoretical values \u200b\u200bfor the GOST tables were calculated taking into account the real geometry of the pipe product profile, so they are more accurate. Since the formulas used in these calculations are much more complicated than the one given above and require much more time for calculations, we do not present them. In conditions where there is no Internet at hand and reference books, a simplified quick calculation will be enough to determine the approximate weight of the pipe. And the exact weight is better to find out by weighing the product.

In the article we will try to figure out in which cases it is necessary to calculate the mass of the pipe and how it is done.

Why is this needed?

Calculation of steel structures

Before starting to manufacture any metal structure, you need to perform a strength calculation.

• If we are talking about a pipeline, you need to know how often you need to put supports so that the pipe does not sag.
  Moreover, the mass of the pipeline is not only the weight of the transported liquid, but also the mass of the steel pipes of which it consists.

• When we talk about the load-bearing frame of an office building, a sports complex or an exhibition hall, we again need to calculate the weight of the structure.
  Indeed, not only people in the building will press on the foundation and supports with their weight.
  In fact, the weight of the steel frame of a sandwich panel building accounts for most of the total mass of the building, including all its contents.

Please note: a channel or an I-beam is used much more often as a basis for overlapping pipes (most often square or profile). They provide greater strength for the same specific gravity.

Calculation of the number of pipes when purchasing

Suppose you have drawn up a project for a pipeline or metal structure and calculated that you need to purchase 1200 meters of pipe with a wall thickness of 4 millimeters and an outer diameter of 100 millimeters.

However, a surprise awaits you at the metal warehouse: wholesale lots of pipes are sold not by meters, but by tonnage. If so, the only way out is to recalculate the number of pipes you need from meters to tons.

Remembering geometry

Calculation of the mass of a round pipe

1. We calculate the circumference of the pipe... It is equal to the product of the outer diameter of the pipe by pi.
2. We count... It is equal to the product of the circumference by ... the same one meter.
3. We calculate the volume of a substance in a running meter of a pipe... With sufficient accuracy, it can be considered equal to the product of the area and the wall thickness.
4. We calculate the mass of a running meter of the pipe... The steel has a density of 7850 kg / m3. The mass of a running meter will be equal to the product of this number by the volume of the pipe substance calculated by us.
5. We multiply the resulting mass of a running meter by the length of the pipeline... In meters, of course. Celebrating victory.

Let us, as an example, calculate the mass of those same thousand two hundred meters of a pipe with a diameter of 100 mm and with walls 4 mm thick.

1. 0.1 * 3.14159265 \u003d 0.314159265 m.
2. 0.314159265 * 1 \u003d 0.314159265 m2. Honestly, this operation could have been skipped 🙂
3. 0.314159265 * 0.004 \u003d 0.00125663706 m3.
4. 0.00125663706 * 7850 \u003d 9.864600921 kg.
5. 9.864600921 * 1200 \u003d 11837.5211052 kg.

In total, taking into account errors, waste when cutting and other absurdities, it makes sense for us to purchase 12 tons of the cherished pipe.

Calculating the mass of a square pipe

Here the calculation algorithm is slightly different.

But just a little.

1. We calculate the length of the perimeter of the pipe section... It is equal to the product of the wall size of a square pipe by four.
2. We calculate the area of \u200b\u200ba running meter of the pipe... As you might guess, the number obtained at the previous stage is multiplied by one meter; as a result, it turns out the same, but no longer in linear, but in square meters.
3. We calculate the volume of the pipe substance in a running meter, again multiplying the surface area of \u200b\u200ba running meter of pipe by the wall thickness.
4. We multiply this volume by the density of steel (7850kg / m3, remember?).
5. We calculate the weight of the pipe we need, multiplying the mass of one running meter by the footage.

Let's calculate the mass of the same 1200 meters of pipe with the same wall thickness of 4 mm and a wall size of 100 mm.

At the same time, we will understand how the mass of a round and a square pipe is related with such close dimensions.

1. 0.1 * 4 \u003d 0.4 m.
2. 0.4 * 1 \u003d 0.4m2.
3. 0.4 * 0.004 \u003d 0.0016 m3.
4. 0.0016 * 7850 \u003d 12.56 kg.
5. 12.56 * 1200 \u003d 15072 kg, or a little more than fifteen tons.

Calculating the mass of a rectangular pipe

And here the difference is small:

1. The perimeter of the pipe section is calculated as the doubled sum of its sides;
2. The surface area of \u200b\u200ba running meter is also obtained by multiplying the perimeter of the pipe by one;
3. The volume of a substance in a running meter of a pipe is still equal to the product of its surface area by the wall thickness (approximately, of course);
4. We obtain the mass of a running meter by multiplying the volume from the previous point by 7850;
5. The result in kilograms must be multiplied by the length of the pipeline to obtain the total weight of the pipe.

To walk like this: let's calculate what the mass of a steel rectangular pipe with a length of 18 kilometers, dimensions of 180x145 millimeters and with twenty-millimeter walls will be.

Such a monster is actually produced and used as a load-bearing element where high flexural strength is required.

1. (0.180 + 0.145) * 2 \u003d 0.65 m.
2. 0.65 * 1 \u003d 0.65 m2.
3. 0.65 * 0.02 \u003d 0.013 m3.
4. 0.013 * 7850 \u003d 102.05 kg. However, not everyone can tear off a meter of such a pipe from the floor.
5. 102.05 * 18000 \u003d 1836900 kg, or 1836.9 tons of pipe.

Everyone has their own reasons for determining the mass of one pipe or an entire batch. For example, it is necessary to resolve the issue of laying communications, with a carrying capacity vehicle... But this is mainly required to verify the correctness of monetary calculations.

The specificity of pipe products is that their cost is more "tied" not to the length of the products, but to their weight, and the price mainly depends on the raw material component, that is, on the amount of metal in 1 running meter, so the weight of the pipe can be calculated by diameter and wall thickness - in this case they are the most important indicators.

How to find out the weight of the pipe

According to the tables posted in profile directories or on thematic sites. In many of them, the calculated weight of 1 running meter is indicated in the right column. pipes for each sample, depending on it and its wall thickness.

Using an online calculator. If you have a PC and Internet access at hand, then it is enough to put the initial data (wall thickness, outer diameter) in the appropriate "windows", and the result is ready.

According to the formula. It is given in GOST No. 8732 of 1978 and is common for any pipes, therefore, the data on the mass obtained as a result of calculations will be approximate. Nevertheless, they do not go beyond the margin of error and it is quite possible to operate with them.

M \u003d 0.02466 x S x (Dн - S)

• М - weight of 1 r.m. pipes.
• S is the wall thickness.
• Dн - diameter (outer).

There is another formula that is used less often, but it gives, firstly, in some cases a more accurate result, and secondly, it is applicable for any type of product - steel, copper, cast iron pipes.

On a note!

When calculating according to formula No. 1, the correction factor is indicated on the basis that the density of steel is taken as an average, equal to 7850 kg / m³. Therefore, when determining the mass of pipes made of other materials, the error can be significant.

It is based on the ratio known from the school - M (weight 1 r.m.) \u003d p (density) x V (volume).

What to consider - since for further calculations it is enough to know the mass of 1 running meter. pipe, then the volume in this case is equal to its cross-sectional area. This can be seen from the formula - V \u003d S x L (and length \u003d 1).

It is not difficult to determine the cross-sectional area (again, remembering your native school). There are 2 methods:

• find the areas of the outer and inner circle (S \u003d π / 4 x D2), and then determine the difference between the obtained values;
• modify this formula by substituting the values \u200b\u200bof the diameters (external and internal) into it - S \u003d π / 4 x (D2n - D2v).

Note

• It is customary to indicate the linear parameters of products: section and thickness - in "mm", length - in "m". Using this or that formula to calculate the weight of the pipe, it is necessary to convert all the initial values \u200b\u200binto one dimension. If the density is in "kg / m3", then the diameters and thickness must also be expressed in "m".
• Real deviations of the pipe wall thickness from the value specified in GOST can be significant (up to ± 8%), and this is not a violation. If you need to know the weight of the pipe with maximum accuracy, then it is better to make an independent measurement of this value, and not be guided by the data from the accompanying documentation. With large sample lengths (and their number), the difference in the indicated batch weight and the actual weight can be significant. Therefore, in real value - too.
• To find out the mass of a pipe from a specific material more accurately, you should determine its specific gravity (density). These data are reflected in GOST No. 1050 of 1988 (steel), 1412 of 1985 (gray cast iron) and a number of other standards. Finding the required documents is easy by typing the required query into the search bar.