ISO 12917-1-2017 PDF

Full title and description

St ISO 12917-1-2017 — Petroleum and liquid petroleum products — Calibration of horizontal cylindrical tanks — Part 1: Manual methods. This International Standard specifies manual procedures for calibrating nominally horizontal cylindrical storage tanks installed at fixed locations, including provisions for insulated and non‑insulated tanks, above‑ground and underground installations, pressurized tanks and a range of end‑head shapes.

Abstract

ISO 12917-1:2017 defines manual calibration methods for nominally horizontal cylindrical tanks, applicable to knuckle‑dish‑end, flat‑end, elliptical and spherical head tanks and to tanks inclined from the horizontal where a correction for tilt is applied. Practical application guidance in the document indicates typical practical limits of about 4 m diameter and 10° tilt for the manual methods described.

General information

• Status: Published (Edition 2, confirmed) — current edition with an amendment published in 2025.
• Publication date: March 2017 (Edition 2; published March 2017).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 75.180.30 (Volume measurement and equipment).
• Edition / version: Edition 2 (ISO 12917-1:2017).
• Number of pages: 46 pages (main document).

Scope

This part of ISO 12917 specifies manual methods for the calibration (capacity tables, volume‑to‑level relationships and related measures) of nominally horizontal cylindrical tanks installed at fixed locations. It applies to insulated and non‑insulated tanks, above‑ground or underground, and to pressurized tanks and various head types (knuckle‑dish, flat, elliptical, spherical). The methods may be used for tanks inclined from horizontal provided tilt corrections are applied; practical limits for manual methods are indicated in the standard.

Key topics and requirements

• Procedures for measuring tank geometry (internal dimensions, shell and head shapes) required to generate calibration tables.
• Manual gauging and level measurement techniques and the calculation of volume from measured levels.
• Corrections for tank inclination (tilt) and for common head shapes (elliptical, spherical, knuckle‑dish, flat ends).
• Recommended practical limits and applicability notes for manual methods (typical diameter and tilt guidance).
• Guidance on uncertainty considerations and factors affecting calibration accuracy.

Typical use and users

Used by metrology laboratories, petroleum storage operators, calibration technicians, inspection bodies, and engineers responsible for inventory control and custody transfer measurements of liquid petroleum products stored in horizontal cylindrical tanks. Typical applications include preparation of tank tables for inventory, verification of delivered volumes and periodic re‑calibration after maintenance or repair.

Related standards

ISO 12917-1:2017 replaces ISO 12917-1:2002 (withdrawn) and is part of the ISO 12917 series addressing calibration and gauging of horizontal cylindrical tanks; subsequent parts and related documents address alternative methods or specific equipment where applicable. An amendment to ISO 12917-1:2017 (Amendment 1) was published in 2025.

Keywords

tank calibration; horizontal cylindrical tanks; petroleum; volume tables; manual methods; tank gauging; tilt correction; calibration uncertainty; storage tanks.

FAQ

Q: What is this standard?

A: ISO 12917-1:2017 is an International Standard that specifies manual methods for calibrating nominally horizontal cylindrical storage tanks used for petroleum and liquid petroleum products.

Q: What does it cover?

A: It covers manual measurement and calculation procedures to produce calibration tables (volume versus level), including guidance for measuring geometry, correcting for tilt, and accounting for common head shapes (knuckle‑dish, flat, elliptical, spherical). It also gives practical guidance on applicability limits for manual techniques.

Q: Who typically uses it?

A: Metrology and calibration laboratories, petroleum storage operators, inspection firms and engineers involved in custody transfer, inventory control and performance verification of horizontal cylindrical tanks typically use this standard.

Q: Is it current or superseded?

A: The 2017 edition (Edition 2) is the current edition; it was confirmed in review and an amendment (ISO 12917-1:2017/Amd 1) was published in 2025. The 2002 edition was withdrawn and replaced by the 2017 edition.

Q: Is it part of a series?

A: Yes — ISO 12917 is a multi‑part series addressing calibration and gauging of horizontal cylindrical tanks; Part 1 covers manual methods and other parts address alternative methods and related procedures.

Q: What are the key keywords?

A: Tank calibration, horizontal cylindrical tanks, petroleum, manual methods, volume tables, tank gauging, tilt correction, calibration uncertainty.