Insulation between the saddle of the low-temperature heat exchanger and its foundation
Thread Content
Appendix A of GB151-1999, Low-temperature Shell and Tube Heat Exchangers, clause A3.7 states: “For low-temperature heat exchangers... insulation made of pine or other hardwoods impregnated with asphalt should be placed between the saddle and the foundation.” Question: 1. What are the specifications for pine or other hardwoods? Same as the saddle bottom plate size? How is the thickness determined? 2. Are there specific models for pine or mixed wood? Since the saddle has sliding ends, the friction coefficient of the wood must be low to allow smooth sliding of those ends. Does the friction coefficient of pine or other softwoods meet this requirement? If the requirements are not met, which type of wood should be used? 3. How are these problems addressed on-site?
Is it the kind of wood that was used on railway tracks in the past?
Actually, it seems there aren’t many who do this
In our company’s original low-temperature ethylene plant, the heat exchangers and saddles were insulated for low temperatures using polyurethane foam. Pine and mixed woods seem to be rare, as gaps will appear, and the result may not necessarily be good.
The principle is similar to the wooden pads used for the skirt outlet pipes in tower standards when the medium temperature is below -20°C