Some issues regarding the heating coils of crude oil tanks
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The main structure of our company’s 50,000 cubic meter crude oil tank has been completed, but the design firm did not provide a design for the heating coils. I have a few questions I would like to ask everyone: 1. Does the heating coil fall under pressure pipelines or pressure vessels? 2. Is it feasible to use seamless steel pipes when the heating medium is low-pressure steam? 3. Is overall heat treatment required after the construction of the heating coil is completed? The design temperature for the crude oil tank is 80 degrees.
1. Whether it belongs to a pressure pipeline or a pressure vessel depends on whether it meets the requirements of relevant specifications. 2. Yes, it can. 3. No heat treatment is required.
It is recommended that the design institute carry out the design in accordance with relevant standards. The institute will determine whether it is a pressure pipeline, what material should be used, and whether heat treatment is necessary based on these standards. When designing, the properties of crude oil must also be taken into account; the heating coil cannot be designed as an ordinary steam pipeline
Our company is really strange – the design firm we hired didn’t provide drawings for the heating coils. We want to create them ourselves, but we’re not sure whether this requires inspection or not
Seamless steel pipes can be used; no heat treatment is required. Oil storage tanks fall under the scope of the pressure vessel regulations. According to these regulations, the steam heating coils of vessels operating at atmospheric pressure are not covered by them
When were oil storage tanks brought under the jurisdiction of pressure vessel regulations?
It can be designed and manufactured in accordance with the requirements of pressure pipeline specifications.
Question 1: It belongs to a pressure vessel (100% RT inspection is required for the butt welds). Question 2: Seamless steel pipes can be used (note that phosphorus and sulfur present in crude oil need to be taken into consideration when selecting materials). Question 3: Heat treatment is not necessary. Personal opinion: Stainless steel materials should be used for the heating tubes