- From words to deeds
- measurements pipes improvised means
- measurement of small diameter pipes
- Measurement inaccessible pipe
- Measurement LDP
- measurement pipe using photography (copy method)
- Determination of the inner diameter of the pipe available
- control of pipes in industrial conditions
- Video

experience problems with water, gas and sewer system often involves the installation of pipes - Replacement of a fragment of the old pipe or installing a new one.When performing such works require skills determine the diameter of the pipes in your system means at hand.When installing a new water supply system will also need a precise definition of the size of the old pipes with the aim to determine the choice of new plastic or metal pipes.

Of course, there are special tools for such measurements, for example, a laser meter, range-tsirkometr and others.But what if you're not an expert, professional, and in your home toolbox, there are no high-precision instruments?How to mea

Before answering this question, it is useful to know the units of measure, these indicators.Meaning of the pipe diameter, usually measured in inches.One inch equals 2.54 centimeters.

When working with a pipe dimension will be subject to both internal and external diameter of the pipe diametr.Naruzhny it is important due to the fact that its value is taken into account when applying the thread creation and thread connections.Outside diameter to be in direct proportion to the thickness of the pipe walls.Size of the wall thickness is the difference of the outer and inner diameter of the pipe.

## From words to deeds

* From words to deeds laser bracket *

There are several ways to measure the diameter of the pipe with different features depending on the conditions that are important to consider in order to avoid mistakes.Selection of a particular method of measurement will often depend on the availability of the object of measurement.Consider some of them.

## measurements pipes improvised means

most often to measure the diameter of the tube is used commonly known caliper.But you can not be, or when there is a large measure the diameter of the pipe with it is not possible.In this case, it uses the simplest tools and knowledge:

- flexible line (like a measuring tape used in the clothing business);
- roulette;
- school knowledge of pi (it is equal to 3.14).

similar set of tools you can measure not only the diameter of the pipe, but also any other round object - rod, column, or garden beds.

We need to make only one measurement - the length of the pipe circumference with a tape or a flexible line.For this measuring tape or measuring tape is applied to the surface of the pipe at its widest part.The resulting value of the circle should be divided by 3.14.For a more exact size used value - 3.1416.

should be noted that imports of pipes accompanied by documentation that has shown the value of pipe diameter in inches.To convert these values into their centimeters multiplied by 2.54.Similarly, for a reverse translation from centimeters to inches - multiplied by 0.398.

## measurement of small diameter pipes

measurements made with calipers without any mathematical calculations.Conditions - full access to the pipe.This method is suitable for measuring the available pipes of small diameter (less than 15 cm).For measurement of the caliper leg is applied to the end of the pipe and tightly clamped on their outer walls.The value obtained on the scale of calipers to the nearest tenth of a millimeter and is the outer diameter of the pipe.

## Measurement inaccessible pipe

If the end of the pipe is not available for the measurement, that is, when the tube is mounted element already existing schemes of water or gas, then the caliper measurement is applied to the side of the pipe.In this case, an important condition for measurement: length leg calipers exceed half the diameter of the pipe.

## Measurement LDP

* measurement of large diameter pipes *

We have already mentioned the value of the formula.Measurements large tube circumference can be accomplished by a cord or tape measures, and then its diameter is determined by the formula D = L: 3,14, where: D - diameter of the pipe;

L - circumference of the pipe.

For example, if you circumferential length measured 31.4 cm pipe, the pipe diameter be D = 31,4: 3,14 = 10 cm (or 100 mm).

## measurement pipe using photography (copy method)

* measurement pipe photographing *

This standard method applied in full to the unavailability of any size tube.Is applied to the measurement pipe line or any other object whose dimensions are known in advance to any one master (in this case often used matchbox, whose length is 5 cm or coin).Further, this section of the pipe with an attached photograph the subject (except for the camera is available in the present conditions and the use of mobile phone).The following calculations are made on the size of your photos: the picture visual thickness measured in millimeters, and then translate it into real value, given the scale of the photos.

## Determining the internal diameter of the pipe available

* Determination of the inner diameter *

by conventional ruler or caliper measuring the wall thickness of the tube at its cut.This value is multiplied by 2 and subtracted from the outer diameter.The resulting value will be equal to the inner diameter of the pipe.

## control of pipes in industrial conditions

* production control parameters pipes *

Outer diameter water or sewer pipes in large enterprises is monitored and checked by using a complicated formula: D = L: 3,14 -2Δp - 0,2 mm.

In this formula, in addition to the already known values, symbols Δp mean thickness of cloth tape measure in millimeters, which you use to measure the diameter and "0.2 mm" from the formula - is tolerance, taking into account the adherence to the pipe roulette.The value of tolerance for the pipe cross-section of 200 mm ± 1,5 mm.

When measuring large diameter pipe tolerances are measured in percentages.Example for products ranging in size from 820 to 1020 mm permissible deviation = 0.7%.In these measurements using the measuring unit based on ultrasound.

wall thicknesses in the face of large enterprises are measured with a caliper scale division of 0.01 mm.Tolerance of the nominal thickness to decrease should not exceed 5%.

shall be controlled and values of the curvature of the pipe, which should not be more than 1.5 mm per meter length of the tube.Total curvature product in relation to its length should not exceed 0.15%.Roundness of pipe ends is determined by the ratio of the difference between the largest and smallest diameter to the nominal diameter of the pipe.

value of this parameter should not exceed 1% for pipes with wall thickness up to 20 mm and not more than 0.8% for walls higher than 20 mm.

oval tubes can be determined by measuring the diameter of the pipe end with the help of the indicator bracket, or bore gauge in two mutually perpendicular planes.

Simple school knowledge and careful use of simple tools greatly simplify your task - how to measure the diameter of the pipe means at hand.

## Video

We offer watch a video about working with gauges.

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