ISO 9770-1989 PDF

Full title and description

St ISO 9770-1989 — Crude petroleum and petroleum products — Compressibility factors for hydrocarbons in the range 638 kg/m³ to 1 074 kg/m³. This International Standard adopts compressibility factor tables and guidance (originally published by the American Petroleum Institute) used to correct the volume of hydrocarbons metered under pressure to the volume at the equilibrium (saturation) pressure for the metered temperature.

Abstract

ISO 9770:1989 provides compressibility factors (tables and related guidance) for liquid hydrocarbons with densities in the range 638 kg/m³ to 1 074 kg/m³ at reference conditions. The standard supplies numerical correction data and implementation notes used to adjust measured volumes taken under pressure to the equivalent volume at the equilibrium pressure corresponding to the measured temperature. The content is based on API Manual of Petroleum Measurement Standards Chapter 11.2.1M (August 1984) including an API erratum.

General information

• Status: Withdrawn / superseded.
• Publication date: August 1989 (Edition 1).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 75.080 (petroleum and related products; volumetric measurement).
• Edition / version: Edition 1 (1989).
• Number of pages: 1 (published document metadata).

Scope

Defines compressibility factors and related information to correct volumes of crude petroleum and petroleum products (density range 638–1 074 kg/m³) measured under pressure to the corresponding volumes at the equilibrium pressure for the metered temperature. Intended for use where accurate volumetric correction for pressure-induced volume change is required for hydrocarbon liquids within the stated density range.

Key topics and requirements

• Compressibility factor tables for hydrocarbons in the 638–1 074 kg/m³ density range.
• Methodology to convert volumes measured under pressure to volumes at equilibrium (saturation) pressure for the measured temperature.
• Implementation guidance based on API MPMS Chapter 11.2.1M (including noted erratum).
• Limits and applicability defined by density and typical metering temperature ranges; users must check applicability for extreme conditions or non‑standard fluids.
• Reference and compatibility considerations for custody transfer, tank gauging and metering systems.

Typical use and users

Used by petroleum measurement and metrology engineers, terminal and storage operators, pipeline and custody transfer teams, calibration laboratories, fiscal metering specialists, and software/system integrators who implement volumetric correction algorithms for liquid hydrocarbons within the specified density range.

Related standards

ISO 91:2017 (Petroleum and related products — Temperature and pressure volume correction factors and standard reference conditions) — current consolidated standard superseding older tables; API Manual of Petroleum Measurement Standards (MPMS) Chapter 11.2.1M (source material); ASTM D1250/IP 200 series (temperature/pressure correction guidance); national adoptions such as BS 7340 (historical schedule of compressibility factors).

Keywords

compressibility factor, hydrocarbons, crude petroleum, petroleum products, volume correction, pressure correction, metering, density 638–1074 kg/m³, API MPMS, custody transfer, volumetric measurement

FAQ

Q: What is this standard?

A: ISO 9770:1989 is an International Standard that provided compressibility factors and brief guidance for correcting volumes of liquid hydrocarbons (density range 638–1 074 kg/m³) measured under pressure to the equivalent volume at the equilibrium pressure for the measured temperature.

Q: What does it cover?

A: It covers numerical compressibility factors (tables) and implementation notes for hydrocarbons in the stated density range, enabling proper volumetric correction for pressure effects in metering and inventory calculations.

Q: Who typically uses it?

A: Measurement and metrology engineers, terminal and storage operators, pipeline and custody-transfer personnel, calibration labs, fiscal metering teams, and software developers implementing petroleum volume-correction algorithms.

Q: Is it current or superseded?

A: ISO 9770:1989 is withdrawn. Its material has been superseded and consolidated into later petroleum volume‑correction standards; the current consolidated ISO standard for temperature and pressure volume correction factors is ISO 91:2017 (published 2017), which now serves as the up‑to‑date reference for petroleum measurement tables and related correction factors.

Q: Is it part of a series?

A: Yes — it belonged to the family of petroleum measurement tables and correction-factor documents (ISO and API MPMS chapters). Its subject matter has since been incorporated into the broader ISO 91 series (and referenced API/ASTM measurement procedures) for temperature and pressure volume correction.

Q: What are the key keywords?

A: Compressibility, hydrocarbons, petroleum measurement, volume correction, pressure correction, density range 638–1074 kg/m³, API MPMS, custody transfer.