Chemical Tankers / Day 4 / Day 4 Topic 2 Cargo Quantification

Chemical Training Course – Cargo calculations.

Sub Topics

2.1Information required for calculation.

2.2Associated Cargo Documentation.

2.3Calculation of cargo quantity in USA.

2.4Cargo quantity discrepancy protest.

2.5Short loading

2.6Loading restrictions and limitations and maximum filling rates.

Cargo Calculations

What information is required for a Ship to quantify cargo?

Why is it important to calculate cargo quantity during cargo ops?

Discuss.

Cargo Calculations

Information Required:

Loading / Discharging Rates

Load/discharge Figures

Load/discharge Figures (US units)

Cargo Discrepancies (difference ship - shore B/L figures)

Short Loading (shore less than nominated quantity)

Loading Restrictions and Limitations

Vapour Calculations (Vapour recovery operations)

Cargo Calculations

Cargo Documentation:

Notice of Readiness (NOR).

Cargo Quantity Discrepancy Protest.

Notice of Short Loading.

Written protests for restricted discharge, berthing delays, slow terminal operations – manifold connection – slow loading rate – restricted discharge rate – manifold disconnection.

Cargo Calculations

Loading / Discharge Rate calculation - Why is this important?

Completion of tanks & Load/Discharge ops

Tank change over

“Balancing” tanks (trim and list)

Ballast

Ordering Pilots

Notifying shore authorities/Terminal

Cargo Calculations

Ships are fitted with different types of gauging equipment; some are on-line, others may rely on manual gauging

An hourly or half-hourly printout/ullaging enables easy and quick calculation of tonnes/hr or m3/hr and ETC (Estimated Time of Completion) from the ROB (Remaining on Board)

However, simple monitoring of “metres per hour” direct from the ullages will give a reasonable estimate if final ullage or total height are known

Cargo Calculations

Cargo Calculations

Estimated Time of Completion: 12:35 hrs

(including slow down / topping off)