ANNEX
IACS UNIFIED INTERPRETATION MPC 7 - HYDROSTATIC BALANCE
LOADING
MPC 7 Hydrostatic Balance Loading
(May 1998)
(Annex I, Regulation 13 G(7) - Guidelines for
approval of alternative structural or operational method,
IMO resolution MEPC.64(36))
Damage and outflow criteria (as per 4 of the IMO
Guidelines)
.1 The original configuration is the configuration of the
vessel, as covered by the IOPP certificate and the
current G.A. plan prior to the application of MARPOL
Regulation 13G(7).
In the case of a product/crude oil carrier which operates
alternatively with CBT when trading as product tanker or
with COW when trading as a crude-oil tanker, the
assessment in accordance with MEPC.64(36) should be done
for each mode separately.
Calculation of base EOS number as per 4.1 of the IMO
Guidelines (EOS1)
.2 When calculating first EOS number (EOS1) as defined
in 4.1 of the Guidelines, the ship is assumed to be
loaded at Summer Water Line with zero trim, without
consumable or ballast.
.3 For the purpose of calculating EOS 1, the volume of
the cargo being carried by the ship is 98% of the volume
of cargo and fuel oil tanks within Lt as per the original
configuration of the ship. Refer to the annex.
.4 Nominal density of the cargo, Pc
The nominal density of the cargo to be used in the
calculation of EOS1, EOS2 and EOS3 is given by the
following formula:
Pc= △ (summer) - LSW
V98% (original cargo and fuel oil tanks configuration
within Li)
where:
△ (summer): . Displacement of the ship corresponding to
the maximum assigned summer load line with zero trim.
LSW: Light ship weight.
V98% (original cargo and fuel oil tanks configuration
within Li): 98% of the cargo and fuel oil tanks volume
within Lii in ship's original configuration.
Footnote: Written applications for evaluation of tanker
arrangements under MEPC.64(36) received on or after 8 MAY
1998 will be evaluated in accordance with this unified
interpretation unless advised otherwise by the flag
Administration.
