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Size Measurement of Hydraulic Tube

Date:2025-08-07View:13Tags:hydraulic tube, hydraulic piping size, seamless hydraulic tube

hydraulic tube

How To Measure The Size of Hydraulic Tube?

Measuring the size of the hydraulic tube is an essential step in the manufacturing and maintenance of mechanical equipment. Mastering the correct measurement methods, techniques, and precautions will not only improve the efficiency and accuracy of hydraulic tube measurements, but also ensure their quality and safety. Hydraulic tube dimension measurement primarily involves measuring diameter, wall thickness, and length, which are described in detail below.


Choosing Tools for Hydraulic Tube Measurement

Commonly used measuring tools for hydraulic piping measurement include micrometers, vernier calipers, and height gauges. Different measuring tools are required for different hydraulic tube materials and diameters. When selecting a measuring tool, consider factors such as accuracy, sensitivity, and scale size to ensure accurate measurement results.


Size of Hydraulic Tube Measurement

1. Diameter Measurement

Use a tool such as a caliper or micrometer to measure the maximum outer diameter of the hydraulic tube and calculate its diameter. During measurement, ensure that the end face of the caliper or micrometer is perpendicular to the diameter of the hydraulic steel tube to avoid errors.


2. Wall Thickness Measurement

Use a tool such as a micrometer to measure the minimum outside diameter and diameter of the hydraulic tube and calculate its wall thickness. During measurement, ensure the end of the micrometer is perpendicular to the hydraulic tube wall, and the measurement point should be located at the thinnest point on the circumference of the hose.


3. Length Measurement

Use a tool such as a height gauge to measure the length of the hydraulic tube and record the value. During measurement, ensure the parallelism between the end of the height gauge and the end of the hose to minimize error.


Hydraulic Tube Diameter

Measuring the diameter of hydraulic tubes is a fundamental task. Common methods for measuring hydraulic steel tube diameters include the following:


1. Micrometer Measurement

Use a micrometer or digital micrometer to directly measure the outside diameter of the hydraulic steel tube. Note that micrometer measurements rely on contact point location for high accuracy, while digital micrometers are more convenient and accurate.


2. Tape Measure Measurement

Use a tape measure to measure the outside and inside diameters of the hydraulic steel tube. It's important to note that when measuring the inside diameter, you need to use an appropriate tape measure, such as a steel tape measure or a soft tape measure, to minimize measurement errors and achieve high accuracy.


3. Mirror Measurement Method

Use a graduated mirror to measure the outside diameter of hydraulic tubes. This is often used when measuring smaller diameter hydraulic tubes and accuracy is not a priority.


Hydraulic Tube Length

Measuring the length of hydraulic tubes is one of the most basic measurement methods. The following are several common measurement methods:


1. Tape Measurement Method

Use a tape measure to measure length, ensuring you choose the appropriate tape to improve accuracy.


2. Comparison Method

Compare the hydraulic steel pipe to be measured with a standard scale or a fixed length to determine its actual length.


Hydraulic Tube Wall Thickness

The wall thickness of a hydraulic tube refers to the thickness of the pipe wall. This can be measured using a non-scaled outside diameter gauge or a thickness gauge. The specific method is as follows:

Clean the hydraulic tube;

Place the thickness gauge vertically against the pipe and read the thickness;

Determine the specification based on the measurement results.


When measuring the wall thickness of hydraulic steel tubes, pay attention to the variations in wall thickness at bends.


Dimensional References for Different Hydraulic Tube Models

Model

OD (mm)

Wall Thickness (mm)

Length (m)

20#

30

3.5

6~12

45#

38

4.5

6~12

16Mn

40

4

6~12

27SiMn

50

5

6~12

Q345B

60

6

6~12

20G

76

6.5

6~12

ST35

89

8

6~12

ST52

102

10

6~12


Error Control for Hydraulic Steel Tube

In hydraulic steel tube measurement, errors can directly affect the accuracy of the results. Therefore, a series of measures are necessary to minimize errors. For example:


1. Clean the surface of the hydraulic steel tube before measurement to prevent dust, oil, and other contaminants from affecting the measurement results.


2. Ensure the accuracy and sensitivity of the measuring tools during measurement and ensure they meet measurement standards.


3. Calibrate the measuring tools before measurement to ensure accuracy.


4. Avoid external interference during measurement and keep the hydraulic steel tube in a neutral position.


5. Measure the same hydraulic steel tube multiple times and average the results to reduce errors.


Precautions for Measuring Hydraulic Tubes

1. Use precision measuring tools such as micrometers, vernier calipers, and digital micrometers.


2. Select appropriate measurement methods to ensure accurate measurement results.


3. Exercise caution during measurement to avoid scratching or damaging the hydraulic steel tube.


4. After measurement, clean the measuring instruments and work area promptly, and restore the tools to their original position to improve work efficiency.


FQA

1. What should be considered when determining the appropriate size for custom hydraulic piping?

To determine the appropriate size for custom hydraulic steel tubes, it is necessary to measure the hose's diameter, length, and bend radius, and consider factors such as the pressure, flow rate, and temperature of the hydraulic system.


2. What tools are needed to measure seamless hydraulic tubes?

The main tools required for accurate hydraulic steel tube measurement include: a tape measure, outside diameter calipers, inside diameter calipers, a coordinate measuring machine, a microscope, and capillary tubing with an appropriate range.


3. What should I do if the diameter and wall thickness of the hydraulic steel tube have large errors?

Hydraulic steel tube tolerances generally include diameter and wall thickness tolerances. If these tolerances exceed the specified range, the diameter and wall thickness errors will be significant, affecting the performance of the hydraulic system. To avoid this, manufacturers must carefully control tolerances during production.


Summary

Measuring the dimensions of hydraulic steel tubes is an essential part of hydraulic equipment maintenance. Accurate measurement can effectively improve work efficiency and quality, ensuring the proper operation of the equipment.