During the work with pipes it is more convenient to consumers to operate with their length. Metallurgists keep account of the products in tons. Characteristics of devices and constructions at which production **pipes** are used also depend more on the weight of the elements, than on their sizes. For this purpose it is necessary to be able to transfer some parameters of pipes to others – meters in kilograms and vice versa.

- - calculator;
- - caliper.

1. It is the simplest to take value of weight of pipes from the corresponding state standard specifications. Find GOST on the pipe interesting you and find the weight of one meter of pipe in the table of values of theoretical masses. The mass of pipes can be found in the following state standard specifications: - for steel carbonaceous pipes of round diameter – in state standard specifications 10704-91, 8732-78, 10704-91, 8734-75; - for steel square pipes – in state standard specifications 12336-66, 8639-68, 25577-83, 30245-94, TU 36-2287-80; - for steel rectangular pipes – in state standard specifications 8645-68, 25577-83, 30245-94; - for pipes from aluminum and its alloys – in state standard specification 18482-79; - for copper pipes – in state standard specification 617-90. The abundance of state standard specifications is caused by the fact that there are many types of the pipes differing with manufacturing techniques (goryache- and holodnodeformirovanny, sutural and seamless, welded and is not present). To learn pipe weight, it is enough to look at one any GOST as the mass of pipes does not depend on way of their production.

2. If you need to determine the weight of pipe which is available in availability, measure its outside diameter and thickness of wall and find the mass of pipe which corresponds to the measured parameters in state standard specification. If you could not find the necessary GOST, count the weight of one meter of pipe by means of the calculator on formula: P = (F1-F2) *100*p*1000, gder – the weight of one meter of pipe, in kg; F1-the area of cut of pipe taking into account internal opening, in cm²; F2 – the area of cut of internal opening of pipe, in cm²; p – density of material of which the pipe in g/cm³ is made; 100 – number of centimeters in meter; 1000 – number of grams in kilogram. For steel "p" 7.85 g/cm³, for aluminum and its alloys – 2.5-2.8 g/cm³ are equal, for copper and its alloys – 8.4-8.8 g/cm³.F1 and F2 for pipes of circular section are equal π*d²/4 where d – pipe diameter and openings in cm, π – 3.14.

3. In state standard specifications the weight of one meter of pipe is also specified pipes from polymers. However there is complexity which is that polymeric pipes are made of different polymers (polyethylene, polypropylene, polyamide, polyvinylchloride, fibreglasses, the ftoroplast and so forth) which density significantly differs (from 0.9 to 2 g/cm³). That the nobility what GOST will be required to you, it is necessary to know of what plastic the pipe interesting you is made. If you know it, no problems arise. If is not present – there will be no nothing else left how to weigh pipe (if it is in availability) or to accept the average value of density for polymers making about 1 g/cm³ at calculation of mass of polymeric pipe.