Designation api rp 551 1st ed 1993 process measurement instrumentation first edition historical standard the material in sections 2 6 was previously presented in several sections of part 1 of api recommended practice 550 which is now out of print a section 2 api recommended practice 550 part i section 1 flow b. Api rp 551 process measurement active most current buy now details history references organization api publication date 1 february 2016 status active process measurement instrumentation 11 scope the material in sections 2 6 was previously presented in several sections of part 1 of api recommended practice 550 . View api rp 551 process measurement instrumentspdf from math 1024 at grimes education center process measurement instrumentation api . Api rp 551 process measurement instrumentation download book