Advice 1: How to measure pipe diameter

To measure the various elements of the technical facilities or laboratory equipment provide special tools and instruments. If you want to measure, for example, the diameter of the pipe, part of the system of water or gas, the choice of a particular method of measurement is determined by the availability of the object and its size.
How to measure pipe diameter
You will need
  • measuring ruler or measuring tape;
  • - caliper;
  • - camera.
Instruction
1
If you want to determine the pipe diameter, the cross section of which is available to direct observation and measurement, and accuracy requirements measurement minimum use a metal measuring tape or a ruler. Place the measuring tool to the end of the tube at its widest part and count the number of divisions corresponding to the diameter. This method allows you to set the size of the product with an accuracy to several millimetres.
2
To measure the outer diameter of the small pipe size, use the caliper. Attach the legs to push the instrument to the end of the tube and slide them so that they tightly clung to the walls. On the scale of values, determine the required diameter with a precision of tenths of a millimeter.
3
If the mechanical part of the pipe is inaccessible for measurements, for example, when a pipe is included in the current system, under operation, a caliper for measurement attach to the lateral surface of the product. This way you can measure the diameter of the pipe, if the length of the legs of the device exceeds half of the diameter.
4
To calculate the diameter of the larger pipe, use the formula known from the geometry course:

D = L / P; where
D – diameter;
L is the length of the circle;
P is the number PI, approximately equal to 3.14.

To start by means of a cord or tape measure, make the measurement of the pipe on its circumference to find the circumference. The resulting value of the divide by 3.14; the result you will get the diameter of the pipe.
5
If you hold a direct measurement of the pipe for some reason is not possible, use the copy method. To do so, attach to the pipe measuring tool (a ruler) or piece, the linear dimensions which is known in advance (matchbox). Then take a picture of a pipe section with a measuring instrument. Further measurements and calculations spend on photography. It is necessary to measure in the picture the visible thickness in millimetres and convert the calculated data to the actual size of the pipe, given the scale of the shooting.

Advice 2: How to measure water pressure at the tap

In our time, residents of apartment buildings are fierce war with the utilities in their provision of paid services. One such service is water supply. The quality of the provision of this service by public utilities is poor.
How to measure water pressure at the tap
Instruction
1
If you do not take into account the quality of the water, a lot of questions from tenants there is a pressure "tap". When water flows weakly impossible to wash the dishes or take a shower. A legitimate desire to measure the pressure in hot and cold water. To do this yourself, you can use the device for measuring pressure is the manometer.
2
To measure water pressure in the faucet with hot or cold water do the following. Take a water manometer with scale up to 1 kg/cm. Buy the attachment on the crane. Find the two lines of rubber hose of the desired diameter. Check integrity of hoses before collecting a chart to check the pressure in the pipes.
3
Attach the end of one of the segments of the hose nozzle. Slide it to the tap. On the other end of this cut hose attach fitting pressure gauge. At the second fitting of the pressure gauge, secure the end of the second segment of the hose; all places where the hose fits over the fitting, secure with hose clamps of the appropriate size.

 
4
Fasten the attachment on the mixer tap. Place the free end of the second segment of the hose so that the water is not filled apartment (lower in the tub, etc.). Turn the water on full pressure and register (note) the pressure gauge.
5

This is the easiest way to determine the pressure in the pipes of kholodnoye hot water in the home, which can be used independently. It allows with a high degree of accuracy to make the necessary measurements. However, it will need to spend money to buy the pressure gauge, hose, nozzle, but everything else is easy and you can get the exact numbers.
Note
Please note the graduated scale of the pressure gauge: it should be suitable for measuring the pressure in the housing pipeline.
Useful advice
All accessories required for the production of measuring the pressure in your taps, you can easily find on the construction market or a specialty store
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