ISO 91:2017 PDF

Name: ISO 91:2017 — Petroleum and related products — Temperature and pressure volume correction factors (petroleum measurement tables) and standard reference conditions
SKU: ISO 91:2017
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Petroleum and related products — Temperature and pressure volume correction factors (petroleum measurement tables) and standard reference conditions

Название (английский):

ISO 91:2017

Petroleum and related products — Temperature and pressure volume correction factors (petroleum measurement tables) and standard reference conditions

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 21
Дата публикации:: 12 мая 2017 г.
Издание:: ISO IS 91 edition 1 version 1
ICS:: 75.180.30

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Описание (английский):

ISO 91:2017 refers to temperature volume correction factors, which allow users to convert volumes, measured at ambient conditions, to those at reference conditions for transactional purposes. This document also refers to compressibility factors required to correct hydrocarbon volumes measured under pressure to the corresponding volumes at the equilibrium pressure for the measured temperature.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 91:2017 - Petroleum and related products - Temperature and pressure volume correction factors (petroleum measurement tables) and standard reference conditions - defines how to convert measured hydrocarbon volumes at ambient conditions to standard reference conditions for transactional and custody-transfer purposes. The standard covers temperature volume correction factors, compressibility factors for volumes measured under pressure, and the specification of standard reference conditions (see Annex B).

Keywords: ISO 91:2017, temperature volume correction factors, petroleum measurement tables, compressibility factors, standard reference conditions, custody transfer.

Key topics and technical requirements

Purpose: Convert observed liquid hydrocarbon volumes to equivalent volumes at agreed reference temperature and pressure for accounting and trade.

Volume correction factors: Guidance and sources for temperature and pressure correction factors (petroleum measurement tables) to adjust thermal expansion and compressibility.

Compressibility factors: Correction of volumes measured under pressure to the equilibrium (saturation) pressure corresponding to the measured temperature.

Commodity groups: Recognizes three primary groups - crude oil, refined products, and lubricating oils - and a special application category for experimentally derived coefficients.

Defining limits (examples from the standard):

Temperature: approximately −50 °C to +150 °C (−58 °F to 302 °F)
Pressure: 0 to 1 500 psig (≈ 0 to 103.4 bar)
Density ranges for crude and products (typical): ~611 to 1 164 kg/m3 (at standard base temps)

Reference implementation: For custody transfer, ISO 91:2017 requires reference to API MPMS Chapter 11.1-2004 (Adjunct to ASTM D1250-04 / IP 200/04) including Addendum 1‑2007, which provides the implementation procedures and CTPL (correction factor for temperature and pressure of the liquid).

Practical applications and users

ISO 91:2017 is used wherever accurate, consistent volumetric measurement of liquid hydrocarbons is required for trade, accounting or regulatory purposes:

Custody transfer and commercial trading of crude oil, refined fuels, NGL and LPG

Tank gauging and inventory management at terminals and storage facilities

Pipeline and metering systems where volume at standard conditions must be reported

Measurement and metrology engineers, terminal operators, trading houses, fiscal metering teams, and regulators who need standardized correction methods

Software developers and system integrators implementing measurement and conversion algorithms compliant with industry standards

Related standards

API MPMS Chapter 11.1 (2004) / Adjunct to ASTM D1250-04 / IP 200/04 (Addendum 1-2007) - primary reference implementation

API MPMS Chapters 11.2.x and 11.5 - compressibility and density intraconversions

API MPMS Chapter 11.2.4 / GPA TP-27 - NGL and LPG temperature corrections

ISO 13443 - standard reference conditions for natural gas (excluded from ISO 91:2017)

ISO 91:2017 consolidates international best practice for temperature and pressure volume correction factors, ensuring consistent and auditable volumetric conversions used across the petroleum industry.

ISO 91:2017 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Технические детали

SIST EN ISO 13443:2005

Natural gas - Standard reference conditions (ISO 13443:1996 including Corrigendum 1:1997)

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