The transition from the 11th to the 12th edition introduced several technical and administrative changes designed to enhance equipment longevity and operational safety:
: The standard now requires 9 test points (up from 6 in the 11th edition) to more accurately map the performance curve, ensuring no two points in the allowable range are more than 35% apart. api 610 12th edition pdf
: To prevent "dead-heading" (where one pump pushes another back to shut-off), pumps with discharge nozzles larger than 3 inches (80 mm) must now have head values within 3% of each other when operating in parallel. The transition from the 11th to the 12th
: You can buy the secure PDF or printed versions from the Accuris Standards Store or the API Publication Catalog . : Cast iron groups (I-1, I-2) and Ni-resist
: Cast iron groups (I-1, I-2) and Ni-resist (S1, S3) have been removed or consolidated into tougher material categories like S4 and S5 .