Varannan månad ger SteamTeam Nordic tillsammans med vår samarbetspartner TLV ut ett kortare E-magazine där vi lyfter fram och diskuterar vanliga problem som våra kunder stöter på i sina ång -och kondensatsystem.
I den här utgåvan tar vi en närmare titt på värmeväxlare och problemet med ‘stallning‘. Mer information finner ni nedan.
Steam equipment ”stalls” when condensate that has been impeded from draining properly pools inside the equipment. Stall can lead to major issues such as ruptured heaters, water hammer, and uneven heating.
How can you stop stall and optimize your steam equipment? Find out in our popular Steam Theory article ”Methods of Preventing Stall”.
Why heat exchangers stall
Stall can occur in heat exchangers when the load fluctuates. For example, when heaters overheat air, the temperature control valve may reduce the trap inlet pressure to below the outlet pressure. This added pressure will prevent condensate from draining out of the heater, causing it to pool and affect the heating process.
How to prevent stall
To prevent stall and allow condensate to discharge, the trap inlet pressure must be made larger than the outlet pressure at all times. Stall can be resolved by either raising the inlet pressure or lowering the outlet pressure.
Raising the inlet pressure
You can raise the inlet pressure by installing a pump to force condensate through the trap.
One example is a mechanical pump such as a PowerTrap(R), which uses steam pressure from another line to forcibly drain condensate intermittently.
Lowering the outlet pressure
You can lower the outlet pressure using a vacuum pump. A vacuum pump will reduce the outlet pressure to below atmospheric pressure, thereby maintaining the differential pressure required for the trap to operate.
Read the rest of the article to find out more about how to resolve and prevent stall.
We hope you enjoyed this edition of Steam Bulletin. If you are experiencing problems with stall or would like to know more about how to prevent it and optimize your equipment, consult TLV’s Steam Theory resources, book a place at a TLV seminar in your area, or contact a TLV steam specialist directly.
Previous editions of Steam Bulletin are available by accessing the Archive Page.
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Redistributed with permission by SteamTeam Nordic AB, TLVs official distributor in Sweden.