Recommended Practice for Presenting Performance Data on Cementing and Hydraulic Fracturing Equipment API RECOMMENDED PRACTICE 41SECOND EDITION, FEBRUARY 1995REAFFIRMED, SEPTEMBER 2010Recommended Practice for Presenting Performance Data on Cementing and Hydraulic Fracturing Equipment Exploration and Production DepartmentAPI RECOMMENDED PRACTICE 41SECOND EDITION, FEBRUARY 1995REAFFIRMED, SEPTEMBER 2010