Pipe heating
Thread Content
According to the guidance of experts in pipeline heat tracing design, the petrochemical industry standard SH/T 3040-2002 stipulates that pipeline heat tracing in the pipe gallery does not need to pass through the distribution table. Please tell me how to distinguish between pipe heating on the pipe rack and pipe heating in the installation area? For example, if a heated pipeline is led from the main pipe on the pipe gallery to the installation area, is it counted as a pipe in the installation area or a pipe in the pipe gallery? Where is the dividing line between the two?
I would like to add another question: Are there any more detailed standards for the design of heat tracing pipes? For example, what are the heat tracing design requirements for pipes with DN>900mm?
Determine the location of the steam induction
Can you be more detailed? Can you give an example or any specific data?
1. First, one-time cutting of the main line is the standard. 2. One-time cutting is generally based on the boundary line, which can extend as far as the first flange or the first valve, orifice plate of the instrument measuring element, etc.
We have company regulations here. For pipes with DN>150, at least 3 heat tracing pipes should be used. If the temperature of the material in the pipeline is high, thermal conductive cement is also needed.
There are many more accompanying pipes than row labels. How many accompanying pipes do I need for a DN900 pipe? The chemical industry standard stipulates that no more than 4 rods can be used.
Why is there no answer? This question is very real. Can you experts please help me solve the problem?
Petrochemical generally recommends that the number of accompanying pipes should not exceed 3 and the pipe diameter should not be larger than DN25.
This section still needs to be divided into two parts. It is easier to handle the pipe gallery within one meter of the installation.
For heat tracing, the distinction between the installation area and the pipe gallery cannot be too rigid. The pipes on the pipe gallery do not need to pass through the distribution station. The main reason is that there are generally not many pipes that require heat tracing on the pipe gallery, and there are steam main pipes and condensate collection pipes on the pipe gallery, so it is not economical and reasonable to use a distribution station. Similarly, if there are very few heating points in a certain area in the installation area, there is no need to set up a separate distribution station. Just consider the operation of the cut-off valve of the heat tracing pipeline.； On the contrary, if there are many pipes requiring heat tracing on the pipe gallery, it is also reasonable to use a distribution station. The function of the heat tracing pipeline is to supplement the heat loss due to the outer surface of the insulation. Generally, a maximum of four heat tracing pipes are sufficient. If based on heat transfer calculations or experience, the heat tracing length of each steam tracing pipe can be appropriately reduced. There is no need to increase the number of heat tracing pipes. I'm not sure if it's correct, please correct me.
Heat tracing and heating are two concepts. Heat tracing is also called heat trace. It is to compensate for the lost heat. So even if the pipe diameter is larger than 900, as long as the insulation is done well, the heat loss on the pipe is not very big. The larger the pipe diameter, the more layers of insulation layer will be better. You can find the specific formula. You can find the thermal conductivity and thickness of the insulation material. If you choose a good one, the compensated heat can be controlled. If steam tracing is inconvenient, electric heating is also an option. A few more wires with a larger wattage are enough. Anyway, I have seen one with 6 electric tapes...