DE4039176A1 - Detecting and evaluating damaged pipes, e.g. in heat exchanger - by cooling pipes, circulating medium at different temp. and taking and evaluating infrared images - Google Patents

Abstract

The method involves cooling a number of the pipes in the heating system and circulating a medium at a different temp. from that of the pipe metal. Infrared images of the pipes are taken to detect individual pipes in which damage has occurred to enable non-destructive testing or measurement of the degree of damage and hence decisions to be made on replacement or repair. ADVANTAGE - Enables direct identification of damaged pipes and evaluation of degree of damage sustained.

Description

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

Material damage to pipes often occurs Pipe system of heating surfaces or heat exchangers because Circulation problems with the coolant are present in the pipe system, so that there is insufficient cooling and impermissible Warming is the result.

If such disturbances occur briefly, stay that way sustainable material damage. If persistent Circulatory disturbances can be expected with pipe shredders Steam boiler failure, resulting in consequential damage kicking steam jets and excessive repair costs to lead.

Such circulatory disorders occur as a result of constipation or structural defects when it is used for the first time gone steam boilers, after commissioning after repair doors on the pipe system or during continuous operation, without these can be determined or recognized. Damage only or accidental inspections after standstill with deformation or warping of the Pipe systems suggest circulation problems.

The known methods (DD 2 33 881, 2 77 752, 2 80 154, WP G 01 N / 3 30 753 3 , WP G 01 N / 3 30 755 8) cannot be used for such a complex determination and evaluation.

The aim of the invention is circulation problems and / or material Identify and resolve damage using simple methods evaluate.  

The invention has for its object circulating Determine and evaluate individual pipes directly, so that a decision to replace the degree of damage tion or for further operation is possible.

This is achieved in that according to the invention an number of pipes of the pipe system cooled and with a Media filling with heat deviating from the metal tempera tur of the pipes is acted upon by circulation, an infra red recording of the pipes is carried out, based on the infra red image of circulating single tubes can be determined, by means of non-destructive testing or measurement of the pest degree of material, the reason for the order Running disorder determined by visual or volume check and the circulatory disorder eliminated and based on the fix issued the degree of damage the damaged pipes changes, operated with risk and the undamaged Pipes are released for further operation.

In one embodiment, the invention he he purifies.

When commissioning a new installed pipe system, a repaired pipe system or a z. Z. except Be located pipe system of heating surfaces or heat The pipe system is exchanged with a steam boiler Medium filled or the process in the pipe system medium used and subjected to heat, the Temperature of heat with a temperature deviating from the metal temperature of the pipe system must be.

The heat can be at room temperature or while during the cooling phase of the pipe system when not in use take place. In the heating surfaces to be examined to put the medium into circulation.

Using an infrared camera, the pipe so acted upon system recordings made and circulated based on the film disturbed individual pipes determined because this due to the  the different temperature images to undisturbed Individual pipes are easily selectable.

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

As testing or measuring methods u. a. applicable:

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

Should the degree of damage no longer be a continuous operation allow the single pipe to be replaced. In any case, before the replacement takes place To determine the cause of the circulation problem. Reasons for one Circulatory disorder can be:

• - Blockages caused by sweat residues, scale u. a.,
• - constructive defects in the routing or on binding,
• - 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, they are closed remove. Should the degree of damage be a continuous operation allow, so is the reason of the circulatory disorder to determine and the circulation disorder by newts or Eliminate bullets. Should there be construction defects stand, it would have to be decided whether this is immediate or closed must be eliminated at a later date.  

The following advantages are achieved by the invention:

• 1. Detect circulatory disorders at an extremely early stage Time and thus damage in the early stages.
• 2. Recognize circulation problems before the start of the start Initial or re-commissioning.
• 3. Significant savings in testing and maintenance capacity.
• 4. In spite of the low effort, high knowledge gain.
• 5. Classification of the degree of damage is without white teres possible.
• 6. Improved timing and technological classification of remedial measures.
• 7. Improved risk assessment for continued operations.
• 8. Improvement of the constructive design of the plant.

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 a media filling with heat deviating from the metal temperature of the pipes is circulated, an infrared image of the pipes is carried out, individual tubes are disturbed using the infrared image, the degree of damage to the material is determined by means of non-destructive testing or measurement, the reason for the circulatory disturbance is determined by visual or volume inspection, the circulatory disturbance is remedied, and the damaged is determined based on the determined degree of damage Pipes replaced, continued to operate at risk and the undamaged pipes released for continued operation. 2. The method according to claim 1, characterized in that the pipe system with the Pro in the pipe system zeßmedium is applied. 3. The method according to claim 1, characterized in that the pipe system is filled with a foreign medium and applied is struck. 4. The method according to claim 1 to 3, characterized in that that the medium above or below the metal temperature of the Pipe system is heated or cooled. 5. The method according to claim 1 to 3, characterized in that 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 circulation-disturbed single pipes by a magnetic Test method, by a visual method, by a Temperature measurement or a mechanical measurement method be determined. 7. The method according to claim 1, characterized in that the degree of damage to the circulating pipes a magnetic or mechanical test is determined. 8. The method according to claim 1, characterized in that the reason of the circulatory disorder by a visual or Volume test is determined. 9. The method according to claim 1, characterized in that the circulatory disorder caused by pigs or balls of the individual pipes is eliminated.