36:
333:, a US-based non-profit organization working in cooperation with the US National Institute of Standards and Technology, has defined a set of standards in a regulation entitled the "Uniform Regulation for the Method of Sale of Commodities". This regulation defines a standard cubic foot, for compressed or liquefied gases in refillable cylinders
285:
Converting volume units between the standard cubic foot and the standard cubic meter is not exact, as the base temperature and pressure used are different, but for most practical situations the difference can be ignored. Comparing the same volume between the 15 °C (288.15 K) and 101.325 kPa
286:
standard cubic meter versus the 60 °F (288.71 K) and 14.73 psi (101.56 kPa) standard cubic foot gives an error of 0.04%. A standard cubic foot in the US Customary System is approximately equivalent to 0.02833 standard cubic meters in the SI system.
200:
to compute the quantity per unit of volume for other pressures and temperatures. In spite of the label "standard", there is a variety of definitions, mainly depending on the type of gas. Since, for a given volume, the quantity is proportional to the
499:
Example: How many standard cubic feet are in 1 cubic foot of gas at 80 °F and gauge pressure 50 psi? (assuming that there is 13.6 psi atmospheric pressure and ignoring super compressibility)
236:
of gas at 60 °F (288.7 K; 15.56 °C) and at normal sea level air pressure. The pressure definition differs between sources, but are all close to normal sea level air pressure.
225:
but with varying proportions of other gases, a standard cubic foot of natural gas does not represent a precise unit of mass, but a molecular quantity, expressed in
289:
In the natural gas industry, where quantities are often expressed in standard cubic feet, large multiples of standard cubic feet are generally not expressed with
161:
309:(million standard cubic feet). The "M" refers to the Roman numeral for thousand, while a double "M" ("MM") represent one thousand thousands, or one million.
181:
330:
340:
by, "A standard cubic foot of gas is defined as a cubic foot at a temperature of 21 °C (70 °F) and a pressure of 101.325 kilopascals (14.696 psia)".
356:(101.325 kPa), while in Canada, a standard cubic meter for industrial gas use is defined at 15 °C (59 °F) and 101.325 kPa (14.696 psia).
793:
562:
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at a temperature of 15 °C (288.150 K; 59.000 °F) and a pressure of 101.325 kilopascals (1.0000 atm; 14.696 psi).
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A pressure of 14.73 pounds per square inch (1.0023 atm; 101.56 kPa). This value is very close to 30
336:
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at different reference conditions. The reference conditions depend on the type of gas and differ from other
241:
206:
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457:: absolute pressure / standard pressure = (line gauge pressure + atmospheric pressure)/base pressure
756:
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at reference temperature and pressure conditions. It is the unit commonly used when following the
730:
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A pressure of 101.35 kilopascals (1.0002 atm; 14.700 psi). Gives 1.1956 moles per scf.
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An actual volume can be converted to a standard volume using the following equation:
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Uniform Laws and
Regulations in the Areas of Legal Metrology and Engine Fuel Quality
17:
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648:(2017 ed.). National Institute of Standards and Technology. p. 120.
252:). This is the same pressure as the SI system standard pressure. Gives 1.1953
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587:. National Institute of Standards and Technology. 2019. pp. 129, 132
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484:: absolute standard temperature / absolute line temperature = / or /
222:
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278:. It is similarly defined as the quantity of gas contained in a cubic
495:: super compressibility factor (often omitted or shown as equaling 1)
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for "standard" is often omitted. Common units of gas volumes include
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For petroleum gases, the standard cubic foot (scf) is defined as one
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The standard cubic meter of gas (scm) is used in the context of the
635:
Crown, Linda D.; Sefcik, David A.; Warfield, Lisa (November 2016).
279:
209:, each definition fixes base values for pressure and temperature.
293:, but rather with prefixes based on roman numerals, where the
176:, representing the amount of gas contained in a volume of one
145:
29:
637:"Uniform Regulation for the Method of Sale of Commodities"
221:
is an imprecise mix of various molecular species, chiefly
321:(quadrillion standard cubic feet), etc., are also used.
325:
Compressed or liquefied gases in refillable cylinders
680:(3rd ed.). Chapman & Hall. pp. 12–13.
60:. Unsourced material may be challenged and removed.
164:. Another unit used for the same purpose is the
162:National Institute of Standards and Technology
360:Converting actual volumes to standard volumes
8:
182:standard temperature and pressure conditions
331:National Conference on Weights and Measures
714:Electricity and Gas Inspection Regulations
468:: temperature factor (sometimes shown as
266:. Gives 1.1981 moles per scf or 0.002641
120:Learn how and when to remove this message
709:"PART VIII: Provisions Specific to Gas"
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441:: pressure factor (sometimes shown as
348:Yet other definitions are in use for
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425:: actual volume (sometimes shown as
305:(thousand standard cubic feet), and
58:adding citations to reliable sources
674:Compressed Gas Association (1990).
25:
192:The scf and the scm are units of
555:Natural Gas Measurement Handbook
317:(trillion standard cubic feet),
34:
765:Introduction to Gas Measurement
313:(billion standard cubic feet),
301:(hundred standard cubic feet),
196:for gases can be used with the
152:) contained in a volume of one
45:needs additional citations for
757:"Introduction to Gas Metering"
529:Standard cubic feet per minute
1:
582:"Uniform Laws and Regulation"
794:Units of amount of substance
677:Handbook of Compressed Gases
475:for temperature multiplier)
553:James E. Gallagher (2013).
144:representing the amount of
810:
27:Measure of quantity of gas
448:for pressure multiplier)
654:10.6028/NIST.HB.130-2017
557:. Elsevier. p. 10.
768:. Barchard Engineering
717:. Government of Canada
432:for registered volume)
242:pounds per square inch
240:A pressure of 14.696
69:"Standard cubic foot"
166:standard cubic metre
54:improve this article
18:Standard cubic meter
613:. SPE International
607:"Category:Glossary"
134:standard cubic foot
194:molecular quantity
564:978-0-12-800000-7
416:: standard volume
264:inches of mercury
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770:. Retrieved
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52:Please help
47:verification
44:
659:21 November
617:21 November
335:other than
268:pound moles
219:natural gas
213:Natural gas
207:temperature
178:cubic meter
150:natural gas
591:8 December
535:References
518:= 4.16 scf
234:cubic foot
154:cubic foot
80:newspapers
741:ignored (
731:cite book
611:PetroWiki
276:SI system
148:(such as
788:Category
523:See also
270:per scf.
256:per scf.
203:pressure
174:SI units
772:18 July
721:18 July
406:Where,
223:methane
140:) is a
94:scholar
693:17 Nov
684:
561:
217:Since
96:
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82:
75:
67:
760:(PDF)
640:(PDF)
585:(PDF)
280:meter
254:moles
227:moles
188:Usage
101:JSTOR
87:books
774:2014
743:help
723:2014
695:2017
682:ISBN
661:2017
619:2017
593:2019
559:ISBN
354:psia
329:The
307:MMcf
205:and
142:unit
73:news
650:doi
395:× (
337:LPG
319:Qcf
315:Tcf
311:Bcf
303:Mcf
299:ccf
250:kPa
246:atm
146:gas
138:scf
56:by
790::
762:.
735::
733:}}
729:{{
711:.
642:.
627:^
609:.
573:^
543:^
493:pv
400:pv
388:×
381:×
374:=
229:.
184:.
170:Sm
132:A
776:.
745:)
725:.
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663:.
652::
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516:s
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490:F
482:t
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455:p
452:F
446:m
443:P
439:p
436:F
430:r
427:V
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420:V
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379:a
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168:(
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98:·
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