Page 205 - International safety guide for oil tankers and terminals

SHIPBOARD OPERATIONS

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360 mm Main Pipeline

305 mm Branch Pipeline
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
Interface
305 mm Cargo Line and Drop Line 250 mm Cargo Hose

Tank Inlets

Determining the Initial Loading Rate
3
Line Diameter Flow Rate (m /hr) at 1 m/sec Flow
Main Shore Pipeline 360 320
Shore Branch Line 305 362
Hose 250 183
Ship’s Cargo and Drop Line 305 262
ึ
Tank Inlets 250 183 x 2 = 366
3
Therefore, an initial loading rate of not more than 366 m /hr should be requested
at more than 1 metre/sec which would clear any water lying in the line whilst the
velocity at the tank inlets is 1 metre/sec.
Determining the Maximum Bulk Loading Rate

Figure 11.2 – Determining loading rates for static accumulator cargoes

shore pipeline and pumping system maximum flow rates
consistent with proper control of the system. Established practice
and experience indicate that hazardous potentials do not occur if
the product velocity is less than 7 metres/second. Some national
Codes of Practice also suggest 7 metres/second as a maximum
value. However, a number of industry documents acknowledge
that 7 metres/second is a precautionary limit and imply that higher
speeds may be safe, without specifying what the real limits are.
(All the empirical relationships for safe loading have been derived
on the basis of experiments limited to a maximum flow of
7 metres/second.)

Only where well documented experience indicates that higher
velocities can be safely used should the limit of
7 metres/second be replaced by an appropriate higher value.

© ICS/OCIMF/IAPH 2006 171