Discussion on the processing of explosive clad tube sheets
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I suddenly remembered today whether there are any regulations regarding whether the lining on the tube sheet should face upward or downward during drilling； I checked some of the requirements for composite tube sheets and reviewed relevant standards such as JB/T4745 and NB/T47002, but found no specific requirements in those documents. Let’s discuss whether drilling has any impact on the composite layer.
There are no specific requirements for drilling, but requirements do exist when cutting stainless steel composite materials; the coating layer should face upward, unless gas cutting is used in which case the coating layer should face downward. I think for drilling, one can follow the guidelines for cutting composite materials and start drilling from the coating layer. Prevent underlying materials from seeping into the coating.
Thank you! Are the cutting requirements you mentioned specified in the standards or are they industry practices? If there are any standards, please let me know their names. Thank you!
I saw this in the NB/T47015-2011 standard; I’m not sure if it’s correct. In clause 9.1.4, you might want to take a look to see if it can be used as a reference!