Potrebujeme váš súhlas na využitie jednotlivých dát, aby sa vám okrem iného mohli ukazovať informácie týkajúce sa vašich záujmov. Súhlas udelíte kliknutím na tlačidlo „OK“.
Standard Practice for Analysis of Liquefied Natural Gas (LNG) by Fiber-Coupled Raman Spectroscopy
Automaticky preložený názov:
Štandardná prax pre analýzu skvapalneného zemného plynu (LNG) by Fiber-Coupled Ramanovho spektroskopia
NORMA vydaná dňa 1.6.2014
Označenie normy: ASTM D7940-14
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.6.2014
Kód tovaru: NS-39294
Počet strán: 9
Približná hmotnosť: 27 g (0.06 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
BTU, heating value, Liquefied Natural Gas, molecular composition, relative abundance, Raman, Spectroscopy, Wobbe Index, ICS Number Code 75.060 (Natural gas)
Significance and Use | ||||||||||||||||
5.1 The composition of liquefied gas fuels (LNG, LPG) is important for custody transfer and production. Compositional determination is used to calculate the heating value, and it is important to ensure regulatory compliance. Compositional determination is also used to optimize the efficiency of liquefied hydrocarbon gas production and ensure the quality of the processed fluids. 5.2 Alternatives to compositional measurement using Raman spectroscopy are described in Test Method D1945, Practice D1946, and Test Method D7833. 5.3 The advantage of this standard over existing standards mentioned in 5.2 above, is that Raman spectroscopy can determine composition by directly measuring the liquefied natural gas. Unlike chromatography, no vaporization step is necessary. Since incorrect operation of on-line vaporizers can lead to poor precision and accuracy, elimination of the vaporization step offers a significant improvement in the analysis of LNG. |
||||||||||||||||
1. Scope | ||||||||||||||||
1.1 This standard practice is for both on-line and laboratory instrument-based determination of composition for liquefied natural gas (LNG) using Raman spectroscopy. The basic methodology can also be applied to other light hydrocarbon mixtures in either liquid or gaseous states, if the needs of the application are met, although the rest of this practice refers specifically to liquids. From the composition, gas properties such as heating value and the Wobbe index may be calculated. The components commonly determined according to this test method are CH4, C2H6, C3H8, i-C4H10, n-C4H10, iC5H12, n-C5H12, neo-C5H12, N2, O2. The applicable range of this standard is 200 ppmv to 100 mol %. Components heavier than C5 are not measured as part of this practice. Note 1: Raman spectroscopy does not directly quantify the
component percentages of noble gases, however, inerts can be
calculated indirectly by subtracting the sum of the other species
from 100 %.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
||||||||||||||||
2. Referenced Documents | ||||||||||||||||
|
Chcete mať istotu o platnosti využívaných predpisov?
Ponúkame Vám riešenie, aby ste mohli používať stále platné (aktuálne) legislatívne predpisy
Chcete vedieť viac informácií ? Pozrite sa na túto stránku.
Posledná aktualizácia: 2024-04-17 (Počet položiek: 2 859 866)
© Copyright 2024 NORMSERVIS s.r.o.