The crude oil vapor pressure tester.
eravap for crude oil is the leading solution for high precision vapor pressure and density (ASTM D4052) testing of live and dead crude oils according to ASTM D6377, IP481 and GOST 52340. Its unique cell design allows high shaking speeds ensuring unrivaled accuracy and short measuring times. Additionally, special V/L ratio measurements, including the TVP (True Vapor Pressure) method are available.
Crude oil vapor pressure testing
Vapor pressure of crude oil is a key parameter when planning the transportation of crudes through different climate zones. When performing crude oil vapor pressure measurements one has to bear the actual ambient conditions during transportation in mind. Is the crude transported in rail cars the headspace is approximately 5% where as a floating roof-top tank has nearly no headspace at all. This is important since the vapor to liquid ratio (V/L) and the storage temperature are highly influencing the vapor pressure of crude. This is especially true for live crude oil which still contains high amounts of volatile light ends.
Pressurized sampling solutions
Measuring live crudes containing high amounts of volatiles requires the use of a pressurized sampling system, such as eralytics newly developed manual piston cylinder eravap MPC (ASTM D8009) or standard FPC floating piston cylinders (ASTM D3700). If such crudes are measured from an open bottle, most volatiles will be lost, giving wrong VP results. For highly pressurized sampling eralytics special pressure regulator can be attached directly to eravap .
High performance cell shaking technology
Crude oil properties like viscosity play an important role in vapor pressure measurements. As a higher viscosity significantly delays the formation of a pressure equilibrium, shaking of the measuring cell is mandatory for ASTM D6377. eravap features a superior cell and shaker design, which allows for a shaking speed of 4.3 cycles per second (red curves), much higher compared to other vapor pressure testers on the market (green and yellow curves). This results not only in a faster measurement but also significantly increases the accuracy and precision. Insufficient shaking or applying a static measuring time can lead to lower values with a bias of up to 10 kPa (1.5 psi).
HVM – High viscosity module
eralytics‘ high viscosity module also allows the measurement of highly viscous samples. By heating the inlet, the outlet, and all connecting tubes as well as the inlet assembly up to 70 °C, this optional HVM module makes eravap the perfect analyzer for challenging samples like fuel oil or heavy crudes.
eravap crude directly draws up the sample into the measurement chamber by a piston. Sample take-up of more viscous samples naturally takes a longer time until a viscosity where it becomes impractical. Heating up the sample prior to the introduction reduces the viscosity and the filling procedure speeds up.
Technical Specifications
| Available Test Methods | ASTM D5188, D5191, D6377, D6378, D6897, EN13016-1, EN13016-2, EN13016-3 ,IP394, IP409, IP481, JIS K2258-2, SHT 0769, SHT 0794, SN/T 2932, GOST 52340 freely programmable methods EPA / CARB / US Military & NATO reference methods, TVP measurement VP-V/L Speed TestTM – Combined T(V/L) and vapor pressure measurement |
| Correlation to… | ASTM D323, D1267, D2533, D4953, D5190, D5482, D2879 (optional low vapor pressure extension) |
| Fuel Specifications | ASTM D910, D1655, D1835, D4814, D6227, EN 228 |
| Temperature Range | 0 °C to 120 °C (32 °F to 248 °F) with Peltier technology. No external cooling is required. -20 °C to 120 °C (-4 °F to 248 °F) with additional low temperature upgrade (EV01-COOL). External cooling is required. Extrapolated range: -100 °C to 300 °C (-148 °F to 572 °F) |
| Temperature Stability | 0.01 °C (0.02 °F) |
| Pressure Range | 0 kPa to 1 000 kPa (0 psi to 145 psi) |
| Pressure Resolution | 0.01 kPa (0.0014 psi) |
| Vapor / Liquid Ratio | Variable from 0.02/1 to 100/1 Single-, multi-point and curve measurements |
| Precision | Repeatability: r ≤ 0.15 kPa (0.022 psi) / Cyclopentane @ 37.8°C Reproducibility: R ≤ 0.50 kPa (0.073 psi) |
| Available Extension Modules | EV01-COOL: Low temperature module (-20 °C – 120 °C / -4 °F – 248 °F) EV01-VISC: High viscosity module (Heated inlet and outlet up to 70 °C / 158 °F) EV01-VPL: Low vapor pressure module (r = 0.1 kPa; pressure resolution = 0.01 kPa) |
| Autosampler | Optional 10-position autosampler – directly attached |