API RP 41:1995(R2010) pdf download.Recommended Practice for Presenting Performance Data on Cementing and Hydraulic Fracturing Equipment
For purposes of this standard, pump refers to high pressure pumps normally used in fracturing, cementing, or other types of oilfield service pumping operations. Curves describing the hydraulic-horsepower output of the pumping unit repre- sent pressure and flow rates that all components (engine, drive train, pumps, cooling system, etc.) should normally be capable of delivering continuously for a period of four (4) hours under typical ambient conditions. Nothing contained in this publication or any certificate made in accordance with these recommended practices shall be construed as granting any right or license, express or im- plied, under any letters patent for the manufacture, sale, or use of the equipment covered hereby. Further, neither this standard nor any certificate made in accordance with these recommended practices shall be construed as any agreement, express or implied, to indemnify anyone from claims of in- fringement of letters patent. This standard and any certificate made in accordance with these recommended practices shall not be construed as mak- ing or containing any warranty or guarantee, express or im- plied, as to the equipment covered thereby or as to services performed with such equipment.
7.2.6 Calibration一 Recommended
Method Any instrumentation will be recalibrated at any time a dis- crepancy is suspected. The discharge pressure indicating de- vice is to be checked with a dead-weight tester according to the pumping equipment manufacturer ‘s normal instrumenta- tion calibration schedule or to the pressure indicating device manufacturer’s recommended service and calibration sched- ule. If it is found to vary from the prescribed accuracy, it will be corrected and tests using that device will be repeated. Other pressure indicating devices, temperature indicating de- vices, flow meters, and barometer, should be checked at least every 6 months.
7.4.1 Volume Measuring System- Alternate Method
The fluid to be pumped will be water. The tank, preferably cylindrical, is to be sufficiently rigid to resist dimensional change when full of fluid. The height shall not be less than the diameter of a cylindrical tank or the width or length of a rectangular tank. The fluid flow may be either from the tank or to the tank. If from the tank, the system will be termed “inlet flow system”. If to the tank, the system will be termed “discharge flow system”. Also, systems in which the time re- quired to pump a given volume is measured shall be termed a“time required to pump a fixed volume” method. Systems in which the volume is measured on a fixed timing interval shall be termed a“volume measured in a fixed time” method. Inlet flow systems may be either“time required to pump a fixed volume” or“volume measured in a fixed time'” method. Discharge flow systems may be only the“volume measured in a fixed time” method.
API RP 41:1995(R2010) pdf download
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