Problems with heat transfer oil expansion tanks
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Is it a mandatory requirement to install a nitrogen seal on the heat transfer oil expansion tank? Or does the system need to have a nitrogen seal when the amount of heat transfer oil exceeds a certain level? Or can one choose not to set it? Seeking advice from experts
Neither the \"Regulations on Safety Inspection of Organic Heat Carrier Boilers\" nor the \"Organic Heat Carrier Boilers\" (GBT 17410-2008) specify anything regarding this, but installing a nitrogen seal in the expansion tank is beneficial for preventing the oxidation and deterioration of the heat transfer oil as well as for protecting the environment.
It’s not necessary to set it; there is no requirement.
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Related to the heat transfer oil model! Categories C and D must be used; it is mandatory! Class B can be omitted.
GB 23971-2009 Organic Heat Carriers
In September 2018, the provincial authority specifically requested boiler manufacturers to inspect and record the circulation systems of organic heat carrier boiler products and submit the relevant statistics. As a personal suggestion, use Class B products in the design; it would be best if the allowable operating temperature for the heat carrier could be set at 300 degrees. Even at higher temperatures, the instrument graph settings may be checked during inspection.
You need to understand the purpose of nitrogen sealing: it is to prevent the oil from evaporating and forming explosive gases, thereby reducing the risk of fires and explosions. Heat transfer oil should be classified as a Class C flammable material according to relevant standards, and therefore no nitrogen sealing is required.
Heat transfer oil tends to oxidize and deteriorate when in contact with air at high temperatures; by absorbing moisture from the air, it can cause unusual noises in the boiler. Therefore, a nitrogen seal is needed to ensure the integrity of the heat transfer oil circulation system.
There are no specific requirements; the main concern is the oxidation of the heat transfer oil, so nitrogen protection is used over the long term