API RP 41-2010 pdf free download

API RP 41-2010 pdf free 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. 1 Scope This standard provides a standard procedure for measur- ing, reporting, and certifying the hydraulic-horsepower rat- ing of pumping units used in hydraulic fracturing and cementing services operations. The standard also establishes a recommended format for reporting the performance of such pumping units. This standard is applicable to any type of high pressure pumping unit, regardless of components such as prime movers, transmissions, and pumps.
7 Preparation and Operation of Measuring Equipment 7.1 MEASURING EQUIPMENT SPECIFICATIONS -RECOMMENDED METHOD 7.1.1 Test Stand The measuring equipment stipulated in Pars. 7.1.2 through 7.5.6 shall be constructed and maintained to provide consis- tent performance data. Two procedures are provided for de- termining pump performance. The recommended method utilizes a flow meter for flow rate measurement and elec- tronic data recording. An alternate method is included that uses conventional gauges and a batch-volume method to de- termine flow rate. 7.1.2 Volume Measuring System一 Recommended Method The fluid to be pumped will be water. This method utilizes a flow meter to provide flow-rate recording (cumulative vol- ume features optional). The flow meter should be located in the suction line between the pressurizer and the pump suc- tion. The flow meter should be installed in accordance with recommendations of the flow meter manufacturer. 7.1.3 Discharge Pressure Measuring System- Recommended Method The discharge pressure measuring device shall be of the recording type and should record over the range of the test run. The pressure measurement is to be taken at a point not to exceed 1 meter (3 ft) from the pump outlet. The pressure recording device installation should permit adjustable damp- ening so the maximum total fluctuation shall be no greater than 10 percent of the peak indicated pressure. The pressure reading shall be taken as the average of the indicated pres- sures.
7.1.7 Barometric Pressure Measuring System- Recommended Method A means for reading barometric pressure shall be provided at the test site. 7.2 ACCURACY- -RECOMMENDED METHOD The test stand instrumentation shall meet the following standards of accuracy. 7.2.1 Volume- Recommended Method The flow meter or combination of flow meters shall be such that their use will be restricted to the manufacturer’s rated utility range, wherein the overall accuracy of any read- ing shall be within 1 percent of the volume read. 7.2.2 Discharge Pressure– Recommended Method The pressure indicating device must be accurate within the limits specified and calibrated against a dead-weight tester traceable to a recognized standard. Each pressure indicating device shall be tested over its entire scale with readings taken both up and down. The error in pressure indication shall not exceed 1% of the maximum scale graduation. [Refer to ANSI-ASME Std 40.I: Gauges- -Pressure Indicating Dial Type–Elastic Element for accuracy requirements, Accuracy Grade 1A Gauges.]