The test pressure is specified to be much higher than the operating pressure

The specified operation of the test pressure is more than 15% of the operating pressure.

Fold. The barometric test can be divided into two situations, one is the strength test for the pipeline of the gas medium, and the other is the tightness test for the transmission of the liquid medium. The gas used in the barometric pressure test is compressed air or inert gas.

Oil-free air should be used to test oxygen pipelines. Before the air pressure test, the compressive strength of the pipeline and pipeline accessories should be checked, and the safety factor used in the calculation shall not be less than. The pressure of the air pressure strength test is times of the design pressure, and the vacuum pipe is.

Barometric pressure causes:

According to the theory of molecular dynamics, the pressure of a gas is caused by a large number of molecules frequently colliding with the walls of the container. The collision time of a single molecule on the container wall is extremely short, and the effect is not continuous, but a large number of molecules frequently collide with the vessel wall, and the force on the vessel wall is continuous and uniform, and the ratio of this pressure to the area of the vessel wall is the pressure strength is small.

The air pressure is measured in heppascals, taking one decimal place; Some are also measured in millimeters of mercury column height, taking two decimal places. The conversion relationship between millimeter to hPa is:

1 hPa = mm (Hg column height) 3 4 mm (Hg column height), 1 mm = HPa 4 3 hPa.

In 1953 and before, the barometric pressure observation in China was recorded in millimeters of mercury column height, and in 1954 and later, it was recorded in heppascals.

For pressure vessels, the barometric test is a multiple of the design pressure, multiplied by the ratio of the allowable stress of the element at the design temperature to the allowable stress of the element at the test temperature; The tightness test is the design pressure of the container.

The output pressure of the test is not constant and fluctuates to a certain extent, and the response of the relief valve sometimes cannot keep up with the pressure fluctuation, and the pressure peak is probably not more than a fold. The test pressure factor is the safety insurance factor for the pressure resistance of the pipeline. Some industries are doubled, and industries with macros are doubled.

A brief introduction to test stress and work pressure:

Test pressure is the pressure at the top of the container during the pressure test or leak test.

The experimental pressure of the pressure vessel is times of the working pressure, that is, the safety factor (to ensure the safe operation of the pressure vessel under the working pressure).

The working pressure refers to the maximum pressure specified according to the maximum working temperature of the pipeline medium at all levels for the operation safety of the pipeline system. The working pressure is generally expressed by PT.

The design pressure is the maximum instantaneous pressure at which the water supply piping system acts on the inner wall of the pipe. Generally, the sum of the working pressure and the residual water hammer pressure is used. The design pressure is generally expressed in PE.

Their relationship is: experimental pressure, design pressure, and work pressure. <>

The drum furnace is a multiple of the rated working pressure of the steam drum. The test pressure of the DC furnace is times the pressure of the outlet box of the superheater. The test pressure of the reheater is a multiple of the working pressure. The hydrostatic test pressure value of the working pressure is equal to its working pressure.

Article 61 of the Construction Law of the People's Republic of China for completion and acceptance of construction projects must meet the specified quality standards of construction projects, have complete engineering technical and economic information and signed project warranty, and have other completion conditions stipulated by the state. The construction project can only be delivered after the completion experience is qualified; If it has not been accepted or the acceptance is unqualified, it shall not be delivered.

The barometric test pressure is a multiple of the design pressure.

Strength and tightness tests are carried out on water medium for general thermal pipelines and compressed air pipelines; Gas pipelines and natural gas pipelines use gas as the medium for strength and tightness tests; Oxygen pipelines, acetylene gas pipelines and oil pipelines are tested with water as the medium, and then the gas is used as the medium for the strict tung test.

The medium of various chemical process pipelines should be used according to the provisions of the design. If the design is not specified, the air pressure test is generally used for pipelines with working pressure lower than 0 07 MPa.

The test pressure of the strength test, the general power pipeline is times of the working pressure, but not less than the working pressure plus; If the chemical process pipeline is the working pressure, it shall be doubled, but shall not be less than; Pipes that operate under vacuum are; The test pressure ps of acetylene piping is the design pressure).

General provisions for barometric tests

1) The test oxygen pipeline should be oil-free air.

2) Before the barostatic test, the compressive strength of the pipeline and pipeline accessories should be checked, and the safety factor used in the calculation shall not be less than. The pressure of the air pressure strength test is times of the design pressure, and the vacuum pipe is.

3) After the strength test is qualified, it is reduced to the design pressure, and the tightness test is qualified if there is no leakage and stable pressure by applying soapy water (neutral soapy water applied to aluminum pipes) method.

Legal analysis: According to the relevant national construction specifications, the hydraulic test of the decoration standard should be as follows: the test pressure is the working pressure of the pipeline system, but not less than 6 kg).

Legal basis: "Residential Gas Facilities Maintenance Management Restrictions".

Article 1 In order to strengthen the indoor gas facilities, the management is better.

Complete the daily maintenance and replacement of indoor gas equipment and facilities, and formulate this system

Article 2 This system applies to the maintenance and replacement management of the company's indoor gas equipment and facilities.

Divide the boiler in use.

and newly installed boilers.

According to the "Boiler Periodic Inspection Rules", for boilers that cannot be inspected internally, no pressure drop is allowed during the pressure holding period; For other boilers, the allowable pressure drop value p during the packing period is related to the working pressure p of the boiler (shell), as follows

p<, p≤;

p≤;,p≤;

p≥, p≤;

The newly installed boiler must not have pressure drop, leakage, or visible deformation.

According to the "Boiler Periodic Inspection Rules", for boilers that cannot be inspected internally, no pressure drop is allowed during the pressure holding period; For other boilers, the allowable pressure drop value p during the packing period is related to the working pressure p of the boiler (shell), as follows

p<, p≤;

p≤;,p≤;

p≥, p≤;

The boiler water pressure test can not be pressurized. If the pressure drops, the cause of the pressure drop must be ruled out.

What is Work Stress?

It refers to the maximum pressure specified according to the maximum working temperature of the pipeline conveying medium at all levels for the operation safety of the pipeline system.

The working pressure is generally expressed by PT.

What is design pressure.

It refers to the maximum instantaneous pressure of the water supply piping system acting on the inner wall of the pipe. Generally, the sum of the working pressure and the residual water hammer pressure is used.

The design pressure is generally expressed in PE.

Test pressure. Pipes, containers or equipment are tested for compressive strength and air tightness.

The pressure to be achieved by the ingenuity of the world.

The test pressure is generally expressed in ps.

Test pressure Design pressure Working pressure.

The pressure of the test bureau of the hydrostatic test is generally () times the working pressure.

Positive limbs are indeed answered, and the case is buried).