跳至主要内容

How to manufacture the shell and tube heat exchanger II



4. Machining: after checking whether the dimension (outer diameter, thickness) and material of the tube sheet meet the requirements of the drawing, the surface roughness of the machined tube sheet shall not be greater than 25 μ m, and the tube sheet plane shall be visible.





5. Tube plate hole processing: after the tube plate hole of the heat exchanger is finished by the CNC machining center, ensure that the tube plate hole is vertical to the sealing surface of the tube plate, and the hole surface is not allowed to have longitudinal traces of continuity, so as to ensure the effective sealing after the mechanical expansion of the heat exchange tube and tube plate hole.








5. Fabrication and assembly of baffle plate: the baffle plate assembly is divided into two types, I-type and spiral type. After assembly, the baffle plate assembly is sleeved into the shell to ensure that the upper and lower baffle plates fit the shell wall, and the clearance is not more than 3mm, to prevent the influence of water flooding and ensure the heat exchange performance.









6. Assembly and welding of end cover: weld both inside and outside to ensure the welding strength of pipe orifice. Reduce the weld leakage rate.



7. Welding of tube plate and shell: assemble according to the process requirements to ensure the concentricity and perpendicularity of tube plate, cylinder and heat exchange tube. All welds and pipe orifices shall be welded by carbon dioxide gas shielded welding, and welding shall be conducted in strict accordance with the requirements of the product welding process card.



8. Tube expansion: adopt German Technodata numerical control tube expansion machine, mechanical rolling expansion strength expansion, to ensure the sealing performance after tube expansion position expansion of heat exchanger.



9. Air tightness test: assemble all pipe orifices, fill nitrogen or dry compressed air to conduct air tightness test on all pipe orifices and welds in the shell side, and keep the pressure for 24h without pressure drop.

10. Assembly: assemble the end cover after leak detection of the expanded pipe position, multi system evaporator and conduct the cross-talk test of the adjacent system, and maintain the pressure for 12h to ensure no pressure drop loss.


11. Support base installation: the bent compressor, electric box, filter and other brackets shall be assembled and welded according to the size required by the drawing.

12. Painting: after the surface of heat exchanger is polished and plastered, spray primer and finish paint.

13. Packaging and delivery: after the products are painted, assembled and packed in wooden cases, they are ready to be delivered.

评论

发表评论

此博客中的热门博文

Avoid Downtime, Cut Costs: Smart Maintenance for Smarter Chillers

  Screw water-cooled chillers   typically operate around 3,000 hours per year, depending on China's climate and geographical conditions. Regular and scientific maintenance is crucial to ensure long-term, reliable operation, extend the lifespan, and reduce operating costs. Maintenance and Upkeep Preventive maintenance during operation and inspection involves creating annual and monthly maintenance plans based on actual operating conditions. Shutdown Procedures In winter, clean and dry the unit. Open the drain valve to empty the  shell-and-tube heat exchanger  to avoid freezing. The shutdown sequence is: chiller off - cooling tower fan off - cooling water pump off - chilled water pump off. Special attention to anti-freezing: 1. Drain the evaporator and condenser if the unit is outdoors below 0°C during standby. 2. Interlock the water flow switch with the unit to prevent freezing when the chilled water flow switch malfunctions. 3. Ensure water in the evaporator is flowi...
发表评论
阅读全文

Hotels Go Green: Heat Recovery Chillers Cut Costs and Carbon Footprints

  In the operation of hotels, energy costs are a significant factor that cannot be overlooked. The advent of   heat recovery chillers   offers an efficient and energy-saving solution for hotels. ​ A heat recovery chiller, in simple terms, not only performs cooling tasks but also effectively recovers heat. For hotels, this is a highly practical feature. Traditional chillers only accomplish cooling, wasting the heat generated. However, heat recovery chillers are different; they can convert the otherwise wasted heat into usable hot water. In principle, during the cooling cycle of a chiller, the refrigerant releases heat. Heat recovery chillers use special devices to collect this heat, and through a series of heat exchange processes, they can produce hot water. This hot water can be used in various scenarios within the hotel. For example, it can supply water for guest rooms' washing and brushing, provide hot water for the hotel's restaurant kitchen, and even be used for heati...
发表评论
阅读全文

What Are the Key Requirements for Flooded-Type Heat Exchangers in Air Suspension Chillers

  Air suspension chillers   are crucial in many industrial and commercial applications, and the flooded-type heat exchanger is one of the most important components of these systems. Understanding the requirements of the heat exchanger is essential to ensuring the air suspension units operate efficiently and remain stable. A flooded-type heat exchanger works by transferring heat between two fluids with different temperatures. In air suspension chillers, it helps regulate temperature, optimize energy use, and improve overall performance. For instance, it can transfer heat from high-temperature gases to low-temperature liquids, or vice versa. 1. Material Requirements 1.1 Corrosion Resistance In many industrial environments, fluids can be corrosive. For example, they may come into contact with acidic or alkaline substances. To withstand these conditions, the heat exchanger’s tubes and casing need to be made from corrosion-resistant materials, such as stainless steel. Stainless ste...
发表评论
阅读全文