Stability Criteria in the Standard Calc CRITERIA file

IMO A167 Intact Stability criteria

Area under GZ curve up to 30 degrees > 0.055

Area under GZ curve from 30 to 40 deg. or downflood > 0.03

Area under GZ curve up to 40 deg. or downflood > 0.09

Maximum GZ to be at least 0.20 meter at 30 degrees or above

Maximum GZ to be at an angle > 25 degrees

Initial GM to be at least 0.15 meters

IMO 749 Intact Stability Criteria non - passenger

Area under GZ curve up to 30 degrees > 0.055

Area under GZ curve from 30 to 40 deg. or downflood > 0.03

Area under GZ curve up to 40 deg. or downflood > 0.09

Initial GM to be at least 0.15 meters

GZ to be at least 0.20m at an angle > 30 degrees

Max GZ to be at an angle > 30 degrees

IMO Weather Criterion ( Maximum Initial Angle Of Heel )

IMO Weather Criterion ( Areas )

IMO A749 Intact stability Criteria Passenger

Area under GZ curve up to 30 degrees > 0.055

Area under GZ curve from 30 to 40 deg. or downflood > 0.03

Area under GZ curve up to 40 deg. or downflood > 0.09

Initial GM to be at least 0.15 meters

GZ to be at least 0.20m at an angle > 30 degrees

Max GZ to be at an angle > 30 degrees

Angle of heel for passenger crowding < 10 degrees

Angle of heel for turning < 10 degrees

IMO Weather Criterion ( Maximum Initial Angle Of Heel )

IMO Weather Criterion ( Areas )

MARPOL 73/78 (Oil tankers)

Final waterline below down-flood point & within 20 deg. range

Final waterline below prot. openings & within 20 deg. range

Final equilibrium angle for DECK EDGE IMMERSED < 25 degrees

Final equilibrium angle for DECK EDGE NOT IMMERSED < 30 degrees

Range of positive GZ to be > 20 degrees

Maximum GZ to be at least 0.1 meter within the 20 degree range

Area under GZ curve within 20 degree range > 0.0175

Load Line (Oil Tankers > 150m, bulk carriers > 100m)

Final waterline below down-flooding point

Final equilibrium angle for DECK EDGE IMMERSED < 15 degrees

Final equilibrium angle for DECK EDGE NOT IMMERSED < 17 degrees

GM at least 0.05m in upright position after flooding

PASSENGER Ship Rules (S. I. No. 1216)

Margin line not to be immersed

GM at least 0.05m in upright position after flooding

Final equilibrium angle for unsymmetrical flooding < 7 degrees

Range of positive GZ to be > 7 degrees

Maximum GZ to be at least 0.05 meter within positive range

Final equilibrium angle for unsymmetrical flooding < 20 degrees

Range of positive GZ to be > 5 degrees

Maximum GZ to be at least 0.03 meter within positive range

RO-RO Ship Rules

Margin line not to be immersed

GM at least 0.05m in upright position after flooding

Final equilibrium angle for unsymmetrical flooding < 7 degrees

Range of positive GZ to be > 7 degrees

Maximum GZ to be at least 0.05 meter within positive range

Range of positive GZ to be > 5 degrees

Maximum GZ to be at least 0.03 meter within positive range

1990 PASSENGER Ship Rules (One compartment flooding)

Range of positive GZ to be > 15 degrees

Area under GZ curve up to 22 degrees or down-flood > 0.015

Maximum GZ to be at least 0.10 meters within positive range

GM at least 0.05m in equilibrium position after flooding

Range of positive GZ to be > 7 degrees

Maximum GZ to be at least 0.05 meters within positive range

1990 PASSENGER Ship Rules (Two or more comp. flooding)

Range of positive GZ to be > 15 degrees

Area under GZ curve up to 27 degrees or down-flood > 0.015

Maximum GZ to be at least 0.10 meters within positive range

GM at least 0.05m in equilibrium position after flooding

Range of positive GZ to be > 7 degrees

Maximum GZ to be at least 0.05 meters within positive range

CHEMICAL TANKERS IMO A212 L > 150

Range of positive GZ to be > 20 degrees (Final stage)

Maximum GZ to be at least 0.1 meter within the 20 degree range

Range of positive GZ to be > 20 degrees (Final stage)

Final equilibrium angle for DECK EDGE NOT IMMERSED < 17 degrees

Unprotected openings not immersed within 20 deg. range

NES 109 Intact stability criteria

Area under GZ curve up to 30 degrees > 0.080

Area under GZ curve from 30 to 40 deg. or downflood > 0.048

Area under GZ curve up to 40 deg. or downflood > 0.133

Maximum GZ to be at least 0.30 meter

Maximum GZ to occur above 30 deg. heel

Initial GM to be at least 0.30 meters

Wind heeling: A1 >= 1.4 x A2

Wind heeling: GZc < 60% GZmax

Angle of heel due to beam winds less than 30 degrees

High speed turning : Max. heel angle 20

High speed turning : GZc/GZmax < 0.6

High speed turning : Area A > 0.4 of total area

Lifting of heavy weights : Max. heel angle 15

Lifting of heavy weights : GZc/GZmax < 0.5

Lifting of heavy weights : Area A > 0.5 of total area

Crowding of personnel : Max. heel angle 15

Crowding of personnel : GZc/GZmax < 0.6

Crowding of personnel : Area A > 0.4 of total area

Towing : Max. heel angle 15

Towing : GZc/GZmax < 0.6

Towing : Area A > 0.4 of total area

Ship must not loll - GM at 0 must be positive

Angle of vanishing stability less than 70 degrees

NES 109 Damaged stability criteria

Angle of list or loll < 20 degrees

Wind heeling: A1 > Figure 9 value

Wind heeling: A1 >= 1.4 x A2

Wind heeling: GZc < 60% GZmax

IMO A469 Intact Stability criteria for Offshore Supply Vessels

Area under GZ curve up to position of max GZ

Area under GZ curve from 30 to 40 deg. or downflood > 0.03

Maximum GZ to be at least 0.20 meter at 30 degrees or above

Maximum GZ to be at an angle > 15 degrees

Initial GM to be at least 0.15 meters

SPECIAL PURPOSE SHIPS IMO A534

Final waterline below down-flooding point

Final equilibrium angle < 7 degrees

GM at least 0.05m in upright position after flooding

Range of positive GZ to be > 20 degrees

Maximum GZ to be at least 0.1 meter within the 20 degree range

USSR 1987 PASSENGER SHIPS

Final equilibrium angle for DECK EDGE IMMERSED < 15 degrees

Final equilibrium angle for DECK EDGE NOT IMMERSED < 17 degrees

Range of positive GZ to be > 20 degrees

Maximum GZ to be at least 0.1 meter within the 20 degree range

GM at least 0.0m in upright position after flooding

Deck edge not immersed at equilibrium angle

GAS CARRIERS

Final equilibrium angle < 30 degrees

Range of positive GZ to be > 20 degrees

Maximum GZ to be at least 0.1 meter within the 20 degree range

Area under GZ curve within 20 degree range > 0.0175

Final waterline below down-flooding point

Grain criteria

Initial GM to be at least 0.30 meters

Angle of heel grain heeling moments <= 12 degrees

Residual dynamic stability

Area under GZ curve up to 30 degrees > 0.055

Area under GZ curve from 30 to 40 deg. or downflood > 0.03

Area under GZ curve up to 40 deg. or downflood > 0.09

Maximum GZ to be at least 0.20 meter at 30 degrees or above

Maximum GZ to be at an angle > 25 degrees

Norwegian Fishing Vessel

Area under GZ curve up to 30 degrees > 0.055

Area under GZ curve from 30 to 40 deg. or downflood > 0.03

Area under GZ curve up to 40 deg. or downflood > 0.09

Maximum GZ to be at least 0.20 meter at 30 degrees or above

Area under GZ curve up to 30 degrees > 0.055

Initial GM to be at least 0.15 meters

GZ between 40 and 65 degrees > 0.1

Range of positive GZ at least 80 degrees

CHEMICAL TANKERS IMO A212 L < 150

Range of positive GZ to be > 20 degrees (Final stage)

Maximum GZ to be at least 0.1 meter within the 20 degree range

Unprotected openings not immersed within 20 deg. range

Maximum Value of equilibrium angle < 25 degrees

NES 109 Intact with ice

Area under GZ curve up to 30 degrees > 0.051

Area under GZ curve from 30 to 40 deg. or downflood > 0.03

Area under GZ curve up to 40 deg. or downflood > 0.085

Maximum GZ to be at least 0.24 meter

Maximum GZ to occur above 30 deg. heel

Initial GM to be at least 0.15 meters

Wind heeling: A1 >= 1.4 x A2

Wind heeling: GZc < 60% GZmax

Angle of heel due to beam winds <= 30 degrees

Ship must not loll - GM at 0 must be positive

Angle of vanishing stability <= 70 degrees

German Ministry of Transport L <= 100

Area under GZ curve up to 30 degrees > 0.055

Area under GZ curve from 30 to 40 deg. or downflood > 0.03

Area under GZ curve up to 40 deg. or downflood > 0.09

Initial GM to be at least 0.15 meters

Positive range of stability > 50 degrees

For stability range between 50 & 60 dgrs GZ increased by 10mm < 60 dgrs

Par 3.2.8 Ships with large wind lateral plan

Mobile Offshore Drilling Units

MODU Intact Stability Weather Criterion