Determining API Gravity by Stereopycnometer Are a Unit

Determining API Gravity by Stereopycnometer Are a Unit Operating Procedure # 3 Lab OPS-LB-NM-027 Job Hazards Yes Job Hazards Access and Egress Moving Parts Activities of Others Noise Adverse Weather Rail Movement Chemical Exposure Sharp Edges Electricity Slips, Trips, and Falls Fatigue Static Electricity Fire and Explosion Trip Injuries Ground Contamination Trapped Pressure Manual Handling Working at Height Certified by Revision # Date Page 0 6/28/11 1 of 2 References / Documents Yes Standard (SSP-0011) q N/A Full Face Shield / Goggles Special Instructions q Any problems, notify Shift Supervisor or Duane Chaisson. Environmental Hood Clothing—Chemical Protection Gloves—Chemical Personal Fall Protection Respirator / Filter Mask Supplied Air q N/A Other: PPE Quality Assurance WARNI NG CAUTION q N/A Determining API Gravity by Stereopycnometer 1 Weigh empty cup. 2 Pour sample into cup about ½ to 2/3 full. 3 Allow sample and cup to cool down to room temperature, then weigh cup and sample. 4 Turn power on (stereopycnometer). 5 Open cell vent and turn on flow. 6 Crack open N 2 cylinder and allow the instrument to purge out for 10 minutes. 7 After the 10 minutes is up, turn flow off and insert cup into chamber. 8 Screw cover back on chamber and turn flow on to purge chamber out for 10 minutes (flow at 2 – 4). 9 Then turn off flow. 10 Zero digital display. 11 After stable reading, turn selector valve to Va out. 12 Close cell vent. 13 Turn on flow. 14 Allow pressure to reach about 17, 000 on digital display, then turn off flow. 15 Record this display as P 2. 16 Turn selector valve to Va in. q Procedure Completed Date: Prepared By: Approved By: Use Y

Determining API Gravity by Stereopycnometer (continued) Are a Unit Operating Procedure # 3 Lab OPS-LB-NM-026 Certified by Revision # Date Page 0 6/28/11 2 of 2 Determining API Gravity by Stereopycnometer (continued) 17 Record display reading when stabilized as P 3. 18 Open cell vent. 19 Determine the sample weight by subtracting empty cup weight from the sample and cup weight. 20 Using the following equation: Vp = Vc + Va 1 -(P 2 P 3) Vc and Va are known values; solve for Vp. 21 Determine the specific gravity of the sample using the following equation: SP@12 = (Sample Weight / Vp). 22 Determine the API gravity using the following equation: API = 141. 5 specific gravity – 131. 5 23 Remove sample cup and place into blue M oven. 24 Screw cover back on chamber. 25 Close cell vent. 26 Turn off flow and helium. 27 Turn power off. 28 After sample cup has been in the oven for 45 minutes, pour out sample. 29 Rinse sample cup out with toluene and pour toluene into soak for a couple of hours. 30 Finish cleaning sample cup with toluene. q Procedure Completed Date: Prepared By: Approved By: