API RP 41-2010 pdf download
API RP 41-2010 pdf download.Recommended Practice for Presenting Performance Data on Cementing and Hydraulic Fracturing Equipment
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- 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.
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 40.1: Gauges- Pressure Indicating Dial Type– Elastic Element for accuracy requirements, Acuracy Grade 1A Gauges.] 7.2.3 Suction Pressure or Vacuum- Recommended Method The suction pressure measuring 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 max- imum scale graduation. [Refer to ANSI-ASME Std 40. I: Gauges- Pressure Indicating Dial Type- Elastic Element for accuracy requirements, Accuracy Grade 1A Gauges.]
7.4.2 Discharge Pressure Measuring System- Alternate Method The pressure indicating 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 indicating device installation should permit adjustable dampening 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 maximum and minimum indicated pressures. 7.4.3 Suction Pressure Measuring System- Alternate Method The suction pressure measurement is to be taken at a point no more than 1.5 meters (5 ft) from the pump suction. Both positive and negative pressures are to be taken. 7.4.4 Fluid Temperature Measuring System- Alternate Method The temperature of the fluid shall be controlled so that it does not exceed 57°C (135°F). Measurement of temperature is to be taken in the suction between the fluid supply tank and the pump. 7.4.5 Engine Inlet Air Temperature Measurement System- _Alternate Method The engine inlet air temperature shall be measured at the engine air cleaner inlet. The thermometer shall be located so as not to be affected by the operation of the pumping equip- ment. Only dry-bulb temperatures are to be taken.
