I had six years in the Bio/Pharma industry, but never saw a standard, per se, that everyone adhered to. Even P&ID symbols, although largely ISA, were different among engineering houses.
Are you a consultant/contractor? If you are starting from scratch, I'd follow the end user nomenclature as close as possible.
Please can anyone advise where I can get hold of equipment datasheet template? I need to generate datasheet for plug flow reactor, heat exchanger, flow meter, pump, pressure and temperature transmitter.