Introduction:
The quenching system in the external coating area is a crucial component of the pipe coating process. It rapidly cools the pipe after the application of molten coating materials, typically using a water spray system. This rapid cooling solidifies the coating, ensuring proper adhesion and strength for further pipe handling in the pipe coating plant. The quenching process also helps prevent thermal degradation of the coating and substrate, contributing to the overall quality and durability of the coated pipe.
Solution:
After coating application, the coating conveyor will transfer the pipes directly through the quench tunnel, where water is sprayed over the complete external coated pipe surface. Sprayed water is collected and transferred through a cooling tower system back to the spraying system.
Key Features:
- Cooling tower. Ensures a proper water temperature in the water circulation system. Spayed water will warm up when cooling the coated pipe. This warm water is collected and cooled down again which avoids excessive water consumption.
- Steam retraction fans & enclosed quench structure avoids steam escapes out of the quench tunnel towards the coating area, preventing moisture entering the reclaim system of the FBE system.
- pH-measurement to check if quench water is according to the quality requirements. If water quality exceeds certain values, it needs to be replaced.
- Height adjustable spray beam optimized for the pipe diameter being processed.
Benefits:
- Provides rapid strength to the applied coating, minimizing the risk of damage to the coating when pipe is further handled in the pipe coating plant.
- Fitters and cooling tower ensures water can be re-used, preventing excessive water consumption.
- Enclosed quench tunnel and steam retraction fans prevents steam pollution in the vicinity of the quench system.
- Quality measurement tools ensuring required water quality is maintained.
- Typically, the cooling tower is installed on a pedestal, allowing natural flow-back of water saving in water pumps.
- Accommodates a wide range of pipe diameters and lengths, increasing operational flexibility.
- Designed to work harmoniously with other Selmers internal pipe coating plant equipment, enhancing overall plant efficiency.
- Robust construction and reliable components reduce downtime and maintenance costs.
- Intuitive controls and monitoring systems allow for easy operation and adjustment
How It Works:
Water is pumped from the quench water collection basin to the spray beam, which is fitted with nozzles directed at the pipe surface for effective cooling. The used quench water is then collected back into the basin.
The basin is connected to the cooling tower system, which regulates the water temperature to ensure optimal cooling for the quenching process. Steam generated inside the quench tunnel is extracted and vented outside the building using fans.
Quenching system process
The Full Scope:
- Conveyor system: the quench tunnel is typically installed in a wheel (helix) or diabolic (endo) roller conveyor.
- Water removal station: Quench water which has entered the pipe can be removed at a water removal station, to avoid excessive water spillage, maintaining a cleaner work floor in the outbound area and pipe internal is dried quicker in case a subsequent process (e.g. internal blasting) would be required.
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