A beginner has a question about gas volume
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This post was last edited by changfengzhiyi on 2012-2-24 09:51. 1. What is the unit of Sm3/d? 2. How is the unit for the base cube written?
Sm3/d refers to standard cubic meters per day. Sm3 stands for standard cubic meter, which is the volume under standard reference conditions (absolute pressure of XXX kPa, temperature of XXX°C). According to China’s standard GB/T 19205-2008 on Standard Reference Conditions for Natural Gas, this is the unit of gas volume at a pressure of 101325 Pa and a temperature of 20°C. Compared with the international standard ISO 13443:1996 \"Natural gas – Standard reference conditions\", China’s GB adopts only the standard reference pressure specified by ISO, namely 101325 Pa (1 standard atmosphere), but does not use ISO’s reference temperature of 293.15 K (15°C); instead, it adopts 20°C based on the historical background and current practices in natural gas measurement in China. Sm3 is also known as the base cubic meter, while Nm3 is referred to as the normal cubic meter. The conditions for Nm3 are NTP, 0°C, with a pressure of 1 standard atmosphere. The base cubic meter is most commonly used in the commercial settlement of natural gas; it is less common in other fields. It’s similar to a barrel, which is used for international measurement of oil. GB/T 19205-2008, the standards for natural gas reference conditions, provides conversions between these conditions and those specified by ISO standards, and these conversions are actually quite simple. It’s just a 5°C difference in temperature in the gas state.
Sm3/d is the volume at standard pressure, expressed in cubic Sm3. A standard cubic meter is the unit of gas volume under conditions of a pressure of 101325 Pa and a temperature of 20°C.
Thank you, it was explained very clearly.:D:victory: