EN ISO 8973:1999/A1:2020

Liquefied petroleum gases - Calculation method for density and vapour pressure - Amendment 1 (ISO 8973:1997/Amd 1:2020)

Flüssiggase - Berechnungsverfahren für die Dichte und den Dampfdruck - Änderung 1 (ISO 8973:1997/Amd 1:2020)

[Not available]

Gaz de pétrole liquéfiés - Méthode de calcul de la masse volumique et de la pression de vapeur - Amendement 1 (ISO 8973:1997/Amd 1:2020)

Utekočinjeni naftni plini - Računska metoda za gostoto in parni tlak - Dopolnilo 1 (ISO 8973:1997/Amd 1:2020)

General Information

• Status: Published
• Publication Date: 07-Apr-2020
• Withdrawal Date: 30-Oct-2020
• ICS: 75.160.30 - Gaseous fuels
• Technical Committee: CEN/TC 19 - Petroleum products, lubricants and related products
• Drafting Committee: CEN/TC 19 - Petroleum products, lubricants and related products
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 08-Apr-2020
• Completion Date: 08-Apr-2020
• Ref Project: SIST EN ISO 8973:1999/A1:2020 - Liquefied petroleum gases - Calculation method for density and vapour pressure - Amendment 1 (ISO 8973:1997/Amd 1:2020)

Relations

• Amends: EN ISO 8973:1999 - Liquefied petroleum gases - Calculation method for density and vapour pressure (ISO 8973:1997)
• Effective Date: 31-Oct-2018

Overview

EN ISO 8973:1999/A1:2020 is Amendment 1 to ISO 8973:1997, adopted by CEN in April 2020. It updates the international calculation method for density and vapour (vapor) pressure of liquefied petroleum gases (LPG). The amendment clarifies references, corrects wording in the calculation clause, and adjusts an essential density factor used for ethane in the standard’s annex table. This document is relevant for suppliers, laboratories and engineers who perform LPG property calculations for design, safety, quality control and trade.

Key topics and technical requirements

• Scope: Calculation method for LPG density and vapour pressure (as per ISO 8973 methodology); amendment only (no change to main standard structure).
• Reference updates:
  • Replaces the cited reference for gas chromatography analysis with ISO 7941 (no year specified in the amendment text).
  • Moves ISO 6578:1991 (distillation characteristics) to the bibliography.
• Clause change (6.3.2):
  • Clarifies the instruction to “Calculate the absolute vapour pressure of the LPG, p in kilopascals at 37.8 °C, 40 °C, 50 °C or 70 °C as follows:” - improving wording to explicitly state absolute vapour pressure and units (kPa).
• Annex A correction:
  • Updates the density factor for ethane in Table A.1 from 375.76 to 359.78, a numerical correction that affects density computations for LPG mixtures containing ethane.
• Units and temperatures: The amendment reinforces calculation at standardized temperatures commonly used in LPG property reporting (37.8 °C, 40 °C, 50 °C, 70 °C).

Applications and users

Who uses EN ISO 8973:1999/A1:2020:

• Petroleum and LPG producers calculating product density and vapour pressure for specification sheets.
• Analytical laboratories performing gas chromatography and property calculations for quality control and certification.
• Process, storage and transport engineers designing LPG tanks, pipelines and safety systems where accurate vapour pressure and density are required.
• Regulators and metrology labs for compliance testing, custody transfer calculations and safety assessments. Practical uses include density-based mass/volume conversions, pressure-temperature safety margins, tank design calculations and product grading.

Related standards

• ISO 8973:1997 - original calculation method for LPG density and vapour pressure (this amendment).
• ISO 7941 - Commercial propane and butane - Analysis by gas chromatography (referenced).
• ISO 6578:1991 - Petroleum products - Determination of distillation characteristics (moved to bibliography).

Keywords: EN ISO 8973:1999/A1:2020, liquefied petroleum gases, LPG density, vapor pressure calculation, ISO 8973 amendment, ethane density factor.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2020
Utekočinjeni naftni plini - Računska metoda za gostoto in parni tlak - Dopolnilo 1
(ISO 8973:1997/Amd 1:2020)
Liquefied petroleum gases - Calculation method for density and vapour pressure -
Amendment 1 (ISO 8973:1997/Amd 1:2020)
Flüssiggase - Berechnungsverfahren für die Dichte und den Dampfdruck - Änderung 1
(ISO 8973:1997/Amd 1:2020)
Gaz de pétrole liquéfiés - Méthode de calcul de la masse volumique et de la pression de
vapeur - Amendement 1 (ISO 8973:1997/Amd 1:2020)
Ta slovenski standard je istoveten z: EN ISO 8973:1999/A1:2020
ICS:
75.160.30 Plinska goriva Gaseous fuels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 8973:1999/A1
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2020
EUROPÄISCHE NORM
ICS 75.160.30
English Version
Liquefied petroleum gases - Calculation method for
density and vapour pressure - Amendment 1 (ISO
8973:1997/Amd 1:2020)
Gaz de pétrole liquéfiés - Méthode de calcul de la masse Flüssiggase - Berechnungsverfahren für die Dichte und
volumique et de la pression de vapeur - Amendement 1 den Dampfdruck - Änderung 1 (ISO 8973:1997/Amd
(ISO 8973:1997/Amd 1:2020) 1:2020)
This amendment A1 modifies the European Standard EN ISO 8973:1999; it was approved by CEN on 17 February 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This amendment exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8973:1999/A1:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 8973:1999/A1:2020) has been prepared by Technical Committee ISO/TC 28
"Petroleum and related products, fuels and lubricants from natural or synthetic sources" in
collaboration with Technical Committee CEN/TC 19 “Gaseous and liquid fuels, lubricants and related
products of petroleum, synthetic and biological origin.” the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by October 2020, and conflicting national standards shall
be withdrawn at the latest by October 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 8973:1997/Amd 1:2020 has been approved by CEN as EN ISO 8973:1
...