SECTION 15 Atmospheric Diving Suits (ADS) and Systems(2014)
This Section, along with Sections 1 through 10, as applicable, provide the requirements for the design, fabrication and testing of tethered Atmospheric Diving Suits (ADS) and systems.
3.1 Atmospheric Diving Suit (ADS)
An ADS is an anthropomorphic, single person suit with muscle powered articulated arms that is capable of withstanding external pressure and is designed for functions such as underwater observation, intervention, survey, inspection or other tasks. Pressure within the suit is normally maintained at or near one atmosphere.
3.3 Atmospheric Diving Suit System (ADS System)
An ADS System includes the ADS and associated support components/systems such as support stands, access and service platforms, the handling system and the ADS control station.
5 Class Notation
New construction ADS and ADS Systems built under ABS survey are to be assigned the Class notations A1 ADS and A1 ADS System respectively, subject to the conditions of classification referenced in Section 1 of these Rules.
New and existing ADS and ADS Systems not built under ABS survey are to be assigned the class notation A1 ADS and A1 ADS System subject to the conditions of classification referenced in Section 1 of these Rules. (Note: The Maltese cross notation signifying survey under construction is to be omitted).
7 Human Occupancy Pressure Boundary Components
Human occupancy pressure boundary components are to meet the applicable requirements of this Section and Sections 3, 4, 5 and 6.
7.3 Personnel Access
The means of personnel ingress to or egress from the ADS are to be configured and sized appropriately to permit the pilot to enter or exit the suit with relative ease.
Safe access to the entry/exit opening is to be provided by appropriate accessory equipment or stands.
The entry/exit opening is to be fitted with a safety mechanism to prevent accidental closure during entry/exit.
The entry/exit opening is to be fitted with a locking device to secure the opening during diving operations. A safety mechanism is to be provided to prevent inadvertent opening of the locking device during diving operations.
Joints between moving pressure boundary components of the limbs are to meet the following requirements:
Joints are to maintain flexibility of the limb and are to permit the full range of motion at all depths up to the design depth.
Moving joints are to provide a pressure tight seal under all normal operating conditions.
Joints are to have a fail-safe design that, in the event of primary (moving) seal failure, will engage a secondary seal that will maintain the integrity of the pressure boundary and will prevent leakage.
When in fail-safe mode, the joints may be immobilized.
- Joints are to maintain flexibility of the limb and are to permit the full range of motion at all depths up to the design depth.
9 Windows and Viewports
Windows and viewports are to meet the applicable requirements of this Section and Section 7.
Windows are to provide sufficient field of view to permit the pilot to see the arms and hands of the ADS throughout their full range of motion, as permitted by visibility.
Windows are to provide the pilot with a range of view to allow awareness of the ADS location and proximity to other objects as permitted by visibility.
11 Lifting Lugs/Attachments
11.1 Primary Lifting Lugs/Attachments
The ADS is to be provided with primary lifting lugs or attachments designed to support the entire weight of the ADS including the weight of the equipment, supplies and pilot within the ADS. They are to be designed for forces of at least 2g vertical (1g static plus 1g dynamic), 1g transverse and 1g longitudinal, unless otherwise determined by the designer, acting simultaneously under the most severe loading condition.
Where appropriate, the increased loading due to other applicable loads such as added mass and drag are to be also considered.
Calculated stresses are not to exceed those specified in 15/11.5 below.
11.3 Emergency Lifting Lugs/Attachments
Additional lifting lugs or attachments are to be provided for emergency recovery of the ADS.
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