What are the full forms of the abbreviations RD, SD, and PD?
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When looking at the legend for the drainage systems, I encountered the abbreviations SD, RD, and PD; their meanings are designed domestic sewage pipes, rainwater pipes, and industrial sewage pipes, respectively. I would like to ask what the full word is Thank you to all my fellow sailors.
There should be instructions, right? Find the homepage image. I’ll make a guess, for reference only. SD: Sanitary/Sewage Drainage; RD: Rain Drainage; PD: Production Drainage.