API MPMS 17:2022 pdf download

API MPMS 17:2022 pdf download.Manual of Petroleum Measurement Standards Chapter 17.5 Guidelines for Voyage Analysis and Reconciliation of Cargo Quantities.
2.5 Other Documents
Marpol 731782, The International Convention for the Prevention of Pollution from Ships
3 Definitions
For the purposes of this document, the following definitions apply.
3.1
apparent loss
A difference in quantity that is not related to a physical loss.
3.2
complex voyage
Any voyage other than a single-grade cargo movement from one load port to one discharge port.
3.3
physical loss or gain
An actual loss/gain of cargo (sometimes referred to as “real loss/gain).
3.4
simple voyage
A single-grade cargo movement from one load port to one discharge port.
3.5
theoretical differences
The theoretical shore quantity is the vessel quantity adjusted by the VEF at either the load or the discharge port. The theoretical shore quantity minus the actual measured shore quantity is the theoretical difference.
3.6
theoretical discharge port shore volume
The vessel delivered volume (TCV—ROB) divided by the vessels experience factor (VEF).
3.7
theoretical load port shore volume
The vessel received volume (TCV—OBQ) divided by vessel’s experience factor (VEF).
3.8
vessel experience factor
VEF
A compilation of the history of the total calculated quantity (TCV) vessel measurements, adjusted for onboard quantity (OBQ) or remaining onboard (ROB), compared with the TCV shore measurements. The information used to calculate a VEF should be based on documents that follow accepted industry standards and practices, such as inspection company reports.
3.9
vessel-to-vessel transfer
The movement of cargo from one vessel to one or more other vessels.
3.10
volume correction factor
VCF
The ratio of the density of a liquid at a given temperature to its density at reference temperature (normally 60 °F or 15 °C). Multiplying a liquid’s volume by this value computes its volume at reference temperature (net standard volume). Also known as ‘correction, temperature, liquid (CTL).”
voyage analysis report
VAR
A report allowing for consistent organization and calculation of basic manne cargo data.
3.12
voyage summary and reconciliation report
VSRR
A report allowing for consistent summarizing of the various components affecting gains/losses of marine cargo
transfers.
4 Cargo Reconciliation
4.1 General
If a marine petroleum shipment results in a unusual gain or loss, a detailed cargo reconciliation should be made to determine and, if possible, identify the reason(s) for volume differences.
The primary steps for manne cargo reconciliation are:
a) collecting data;
b) completing the VAR and, when required, completing a VSRR;
c) investigating the reason(s) for the loss or gain;
d) taking action where appropriate.
4.2 Collecting Information and Data
This first step consists of gathering all relevant vessel and shore measurement data. This will include the official custody transfer data, together with reports and supporting documentation from the independent inspection company. These are the main sources for measurement and calculation data.
Typical marine transfer inspection reports include shore gauging, metering, vessel gauging, time log, line fill
verification, laboratory analysis, and VEF. (See relevant API MPMS Ch. 17.9 and El HM49 sections for a
complete list of information that should be included in inspection reports.)
Important information that could affect measurements may need to be collected from other sources. This can include but is not limited to terminal ATG readings, remote temperature readings, product movement logs, vessel bunker reports, cargo stowage changes, and weather/sea conditions.
Refer to Figure A.3 in Annex A for information on documentation that should be provided by the terminal, vessel, or inspector.
4.3 The Voyage Analysis Report (VAR)
4.3.1 General
The VAR provides a useful format for the organization of cargo data and provides calculations recommended in this procedure. Any shore-to-shore variances are broken down according to total calculated volume (TCV).