DE4039176C2 - Procedure for determining and evaluating damaged pipes in a pipe system - Google Patents

Description

The invention relates to a method for determining and Evaluation of damaged pipes in a pipe system from Heizfla or heat exchangers.

Material damage often occurs on pipes in a pipe systems of heating surfaces or heat exchangers, because in Pipe system circulation problems of the coolant are present, so that there is insufficient cooling and inadmissible heating are the result.

If such disruptions occur briefly, they remain material damage. When circulation continues malfunctions can be expected with pipe rippers, which lead to failure of the Steam boiler, for consequential damage due to escaping steam radiate and lead to high repair costs.

Such circulatory disorders occur as a result of constipation or structural defects when it went into operation for the first time steam boilers, when commissioning after repairs on Pipe system or during continuous operation without these can be determined or recognized. Only occurred Damage or accidental inspections after downtime Deformations or warpage of the pipe system leave circulation suspect interference.

The known methods (DD 2 33 881, 277 752, 280 154, 286 228, 286 229) are for such a complex investigation and evaluation not applicable.

There are a variety of methods for locating Effects known to cause leaks or leaks.

So there are leaks in seals for windows, doors and trunk of aircraft by generating a temperature and pressure difference between inside and outside and localization become known (EP 016 656).

The leak detection of a pressurized chamber is carried out by Comparison of the change in gas pressure with speed change in temperature a leak detection is achieved (US 46 25 545).

To a thermal alternating stress with cracks Excluding components is on the surface of the component  the measured temperature in relation to the flow of the Damaging medium set (DE 32 19 512).

However, these procedures are not suitable for injured Determine and evaluate individual pipes of a pipe system.

The invention has for its object, circulatory problems determine and evaluate cell tubes directly, so that over the Degree of damage a decision to replace or Continued operation is possible.

This is achieved in that according to the invention a number cooled by pipes of the pipe system and with a medium a temp different from the metal temperature of the pipes is acted upon by circulation, based on the infrared taking circulating disturbed individual pipes can be determined by means of non-destructive testing or measuring the degree of damage of the material found, the reason of the circulation disturbance determined by visual or volume inspection as well as the order malfunction eliminated and based on the determined pest the damaged pipes replaced or with Continued to operate and the undamaged pipes for the Continued operation will be released.

The invention is explained in more detail using an exemplary embodiment tert.

When commissioning a new installed pipe system, a repaired pipe system or a z. Currently out of service pipe system of heating surfaces or heat exchangers a steam boiler, the pipe system with a medium filled or the process medium in the pipe system ver turns and applied heat, the temperature of the Medium from the metal tempera the pipe system must deviate.

The heat can be at room temperature or during the cooling phase of the pipe system when decommissioning respectively. The medium is in the heating surfaces to be examined to circulate.  

Using an infrared camera, the Rohrsys recordings made and circulated with the help of the film Individual pipes determined because these due to the differ Chen temperature images for undisturbed single pipes without further are selectable.

The circulating-disturbed individual pipes are determined using non-destructive testing or measurement for damage degree of material examined.

As testing or measuring methods are u. a. applicable:

• - magnetic test methods (e.g. determination of the magneti residual field strength),
• - mechanical measurements (expansion).

Should the degree of damage no longer be a continuous operation allow the individual pipe to be replaced.

In any case, before the change is made, the reason to determine the circulation problem. Reasons for a circulatory disorder can be:

• - blockages caused by sweat residues, scale, etc.,
• - constructive defects in the routing or integration of lines,
• - constructive defects in the integration of panels.

The determination is made by visual inspection (endoscopes) or volume testing (ultrasound, radiometric).

If there are any design defects, these must be inspected term. If the degree of damage allows continuous operation, the cause of the circulatory disturbance must also be determined and to eliminate the circulation disturbance by pigs or balls. If there are design defects, it should be decided whether this immediately or at a later date are eliminated.  

The following advantages are achieved by the invention:

• 1. Detect circulatory problems at an extremely early time point and thus damage in the early stages.
• 2. Detection of circulatory problems before the start of the first or Re-start-ups.
• 3. Significant savings in testing and maintenance costs zitat.
• 4. In spite of the low effort, high knowledge gain.
• 5. Classification of the degree of damage is straightforward possible.
• 6. Improved timing and technological classification of Remedial measures.
• 7. Improved risk assessment for continued operations.
• 8. Improve the design of the system.

Claims (9)

1. A method for determining and evaluating damaged pipes of a pipe system of heating surfaces or heat exchangers, characterized in that a number of pipes of the pipe system are cooled and charged with a medium with a temperature different from the metal temperature of the pipes by circulation, an infrared image of the pipes is carried out, using the infrared image to determine circulating individual pipes, using non-destructive testing or measuring the degree of damage to the material, determining the reason for the circulatory disturbance by visual or volume testing and eliminating the circulatory disturbance, and replacing the damaged pipes based on the determined degree of damage or continue to operate at risk and the undamaged pipes are released for further operation. 2. The method according to claim 1, characterized in that the Pipe system with the process medium in the pipe system is applied. 3. The method according to claim 1, characterized in that the Pipe system filled with a foreign medium and acted upon becomes. 4. The method according to any one of claims 1 to 3, characterized in that the medium above or below the metal temperature of the Pipe system is heated or cooled. 5. The method according to any one of claims 1 to 3, characterized in that the medium already during the cooling phase of the pipe system is applied. 6. The method according to claim 1, characterized in that the determined circulating single tubes by a magneti test method, by a visual method, by  a temperature measurement or a mechanical measurement method be checked non-destructively. 7. The method according to claim 1, characterized in that the Degree of damage to the circulation-disturbed pipes by a magneti mechanical or mechanical test is determined. 8. The method according to claim 1, characterized in that the Due to the circulatory disturbance by a visual or volume test fung is determined. 9. The method according to claim 1, characterized in that the Circulation disturbance due to pigs or balls of the single pipes is eliminated.