LPG VAPOR PRESSURE TESTING AT ITS BEST
30 พฤษภาคม 2566
ผู้ชม 522 ผู้ชม
Vapor Pressure Testing of LPG
Information on the vapor pressure of LPG is important for the proper choice of storage tanks and shipping vessels. It is mainly measured for safety reasons that the maximum design pressure of storage and handling systems isn’t exceeded under normal operating conditions. The vapor pressure of LPG can also give insights into the initial evaporation under extreme low temperature conditions.
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Maximum Flexibility with ASTM D6897
ASTM D6897 can be used to measure the vapor pressure of LPG in the temperature range of 37.8 °C to 70 °C. It covers a vapor to liquid ratio of 0.1:1 to 4:1. The maximum vapor pressure is 3500 kPa. However, the precision statement of a repeatability of 7.4 kPa was only determined in the range of 300 kPa to 1463 kPa.
ASTM D6897 is used to specify the LPG vapor pressure according to ASTM D1835. The vapor pressure of butane must not exceed 483 kPa and the one of propane must be below 1434 kPa according to ASTM D1835 measured at 37.8 °C and a vapor to liquid ratio of 0.5:1.
ERAVAP - Unique Measuring Options
The Vapor Pressure Tester ERAVAP is available in two models. ERAVAP (EV10) for vapor pressure testing of all kinds of liquids up to a max. vapor pressure of 1000 kPa (145 psi) and ERAVAP LPG (EV20) for vapor pressure testing of LPG’s featuring an extended pressure range of up to 2000 kPa (290 psi). To complete your range of applications, eralytics offers a variety of unique measuring options for both ERAVAP models. Get an overview of the unique measuring options of ERAVAP
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LPG Configuration
To cover the extended vapor pressure range needed for LPG vapor pressure testing, ERAVAP LPG is equipped with special solenoid valves that cover a pressure range up to 2000 kPa. This adds enough safety margin and allows to test the vapor pressure of LPG even at elevated temperatures.
ERAVAP LPG covers a pressure range of 0 kPa to 2000 kPa and a temperature range of -20 °C up to 120 °C. V/L ratios down to 0.02:1 and up to 4:1 are possible. ERAVAP LPG offers a repeatability of 0.7 kPa clearly outperforming ASTM D6897.
In addition it is equipped with a quick-fit inlet system which allows to connect pressurized cylinders with ease
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, SNT 2932, GOST 52340, TVP 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 |
| 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 2 000kPa (0psi to 290 psi) |
| Pressure Units (selectable) | hPa, kPa, psi, mmHg, Torr, at, atm |
| 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) measured with EV10 and 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) |
| Sample Introduction | Automated via built-in piston Automated sample filtration through a reuseable 80 µm mesh filter No external vacuum pump is required |
| Sample Volume | 1 mL (2.2 mL per rinsing cycle) |
| Measurement Time | 5 minutes for a standard measurement |
| Cleaning | By next sample or solvent |
| Measuring Chamber | Nickel-plated aluminum chamber |
| Display | Industry proven 8.4” color touch screen |
| Languages | English, German, French, Spanish, Russian, Chinese Additional langages available upon request |
| Interfaces | Built-in PC with Ethernet, USB and RS232 interfaces Wifi via external USB dongle Direct LIMS connectivity via LAN, output to printer or PC as CSV or PDF Optional input by external keyboard, mouse and barcode reader |
| Remote Control | Remote service capability via Ethernet interface |
| PC Software | ERASOFT RCS - remote control Windows® software for multi-instrument remote control, convenient data transfer, viewing spectra and result analysis |
| Result Database | Over 100,000 detailed test reports stored in internal memory DVPE, RVPE, PABS, PGAS, PTOT, ASVP & AVP Results can be marked for hazy appearance Graphical view of curve measurements |
| Alarm Tracking | All alarm messages are stored in the database together with the result |
| Automated Calibration Routine | 10-point probe offset correction table, calibration history tracking, substance calibration, self-diagnostics |
| Autosampler | Optional 10-position autosampler – directly attached |
| Operating Conditions | Temperature range 0 °C to 50 °C Humidity up to 90% RH, non-condensing |
| Power Requirements | Auto-switching 85-264 V AC, 47-63 Hz, max. 150 W (multi-voltage power supply) Field application: 12 V DC (vehicle battery) adapter available |
| Modell Number | EV20 |
| Dimensions / Weight | 29 x 35 x 34 cm (11.4 x 13.8 x 13.4 in) / 9.7 kg (21.4 lb) |
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