Overview
ISO 11563:2003 - "Crude petroleum and petroleum products - Bulk cargo transfer - Guidelines for achieving the fullness of pipelines" provides standardized procedures to ensure pipelines used in bulk cargo transfer are filled with liquid compatible with the cargo. The standard applies to crude oils and petroleum products that are liquid at atmospheric pressure and observed temperature, and is intended for loading, discharge and local movements between storage tanks (not for transcontinental movements).
Key topics and technical requirements
- Objective: Achieve and verify pipeline fullness to improve measurement accuracy during bulk cargo transfer and reduce trapped vapour or incompatible material.
- Procedures described:
- Line displacement (vessel ↔ shore) - measure Total Observed Volume (TOV) transferred and compare delivery vs receipt; stop when transferred TOV ≥ 120% of combined pipeline capacity.
- Internal circulation (shore lines) - circulate liquid through isolated pipeline, displacing ≥ 120% of pipeline capacity and comparing TOVs of delivering and receiving tanks.
- High‑point bleed‑valve / sight‑glass - confirm liquid at pipeline high points; suitable bleed valves and sight‑glass fittings required and venting must be controlled.
- Pigging - use a tight‑fitting pig (where facilities exist) to sweep the line and leave it full of propellant.
- Line press (line pack) - pressurize pipeline and monitor tank level changes; typical agreed tolerance example is a 3 mm tank‑level difference.
- Measurement and comparison:
- Use TOV, Gross Standard Volume (GSV) and, where free water is present, Total Calculated Volume (TCV = GSV + FW).
- Parties must agree an agreed tolerance (based on measurement precision and historical records) before operations.
- Roles and responsibilities:
- Terminal: designate pipeline system and nominal capacity, identify bleed/sight‑glass points if applicable.
- Vessel: provide line capacities and line‑fullness conditions; cooperate to minimize trim/list effects on measurements.
- Safety: Follow the International Safety Guide for Oil Tankers and Terminals (ISGOTT) and any applicable statutory or operator regulations. Control and contain vented vapours or liquids.
Applications
- Custody transfer preparation and reconciliation for crude oil and refined liquids
- Pre‑transfer checks to minimize measurement errors caused by vapour pockets or incompatible line contents
- Tank farm and terminal operations for local loading, unloading and internal transfers
- Operational procedures for pigging, pressure testing and visual verification at high points
- Terminal operators and shore facility engineers
- Tanker and barge operators conducting line‑displacement transfers
- Pipeline operators and maintenance teams
- Marine surveyors, metrology and custody transfer specialists
- Safety and operations planners at oil terminals
Related standards and references
Keywords: ISO 11563, pipeline fullness, crude petroleum, petroleum products, bulk cargo transfer, line displacement, pigging, line press, high‑point bleed valve, custody transfer.