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Very good for the answers of jjpenlin, there's sure that the two safety valves have different purposes. But the discharge pressure decided by the internal safety valve. and as almost all plant have their protection measures, there's no necessary to install external safety valve.

it's very helpful. thanks for you information.

Thanks for your reply. I know I can get these information from my supplier, but as a novice, I do want learn some usable knowledge about mechanical seal. The 70's plans, it too many to be memorized. Any advice, please let me know.

According API 682 flush plans, there are more than 70 of them? PLS can anybody can tell me which are the common use in chemical industry ?