How do I choose a 6L to 75L commercial electric pressure cooker?

Please verify the following points and require itemized written supplier responses:（commercial electric pressure cooker pressure-cooker-capacity） Choose by batch size, peak orders, menu and kitchen turnover. 6-15L suits small shops, 20-40L suits regular restaurants and canteens, while 50-75L suits central kitchens and group catering. Do not choose by headcount alone; consider portion size, cooking time, backup units, voltage and kitchen space. Define capacity, accuracy, materials and operating environment before requesting quotes on a uniform basis. Request specification sheets, test reports, certificates, maintenance manuals and spare-part lists. During acceptance, verify appearance, dimensions, functions, safety protection and packaging, and keep test records. Do not compare unit price alone; include customization, freight, spare parts, after-sales support and downtime risk. Keep written records of inquiries, confirmations, FAT, acceptance and warranty commitments.