Transcription
Introduction to PVHONOAA/UHMS Physicians Training in Diving Medicine1
History ASME Safety Committee formed in 1974, with firstpublication of PVHO-1 in 1977 Developed specific guidelines to meet areas notspecifically addressed in Section VIII, Division 1 of theBoiler and Pressure Vessel Code*Use of Pressure Relief Devices*Requirement for Viewports Subsequent PVHO-1 revisions have addressed*Design and Use of Acrylic Viewports*Integral Piping System Design Requirement2
Pressure Vessels for Human Occupancy ASME defines PVHO as a pressure vessel that enclosesa human being within its pressure boundary while it isunder internal or external pressure that exceeds a 2 psidifferential pressure. PVHOs include, but are notlimited to, submersibles, diving bells, personnel transfercapsules, decompression chambers, recompressionchambers, hyperbaric chambers, high altitudechambers, and medical hyperbaric oxygenationfacilities.3
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Publications Section 1: General Section 2: Viewports Section 3: QA for Manufacturers Section 4: Piping Systems Section 5: Medical Hyperbaric Section 6: Diving Systems Section 7: Submersibles11
Section 1References Boiler Code for specific design andfabrication criteria to include:1. Cylinder Geometry2. Allowable Material3. Stiffening Requirement4. Hatch/Door Design5. Pressure Testing6. Use of Non-Metallic Material12
Section 1 General13
Section 2 Viewports Window Design1.2. 1. 1.2. ShapeSeatingMaterial of ConstructionAcrylic Sheet ingInstallation14
Standard Acrylic Geometry15
Section 4 Piping Systems Discusses detailed internal and external piping systemdesign to include:1.2.3.4.5.6.MaterialsService requirementValvesBreathing Gas SystemDepth GaugesMarking17
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Section 4Exterior TubeExterior Brazed20
Interior Layout Inlet Exhaust BIBS Electrical21
Valve Types22
Gauges23
Fire SuppressionTreatment Lock required to have meansof extinguishing fire. This caninclude:1. Automated fire suppression system2. Fire hose/ hand line3. Fire Extinguisher4. Bucket of water with fire blanketMost clinical chamber systems willinclude both automated systems andhand lines.Most deck decompression chambersystems will include only fireextinguishers and fire blankets24
Section 5 Medical HBO Necessitates compliance withexisting PVHO-1 as well asconformity to NFPA 99guidelines Waves requirement for transferlock in chambers rated to 3ATA or less25
Section 6 Diving SystemsConsideration given to the type of service andoperational environment each is exposed to in supportof commercial diving operations Fabrication considerations for differential temperatures and corrosive marine environmentsDynamic loading from transport, lifting, vibration, and wave actionDistinct ergonomic space considerations for saturation systemsRequirement for sanitation facilities (showers, toilets) in saturationProvision for design and integration of mating clamp and closuresDesign parameters for bell and PTC with respect to impact, mating,and ballast26
Section 6 Diving Systems27
Section 6 Diving Systems28
Treatment Air Supply29
How do we know?30
Pre-dive Checklists31
Post-dive Checklist32
Section 7 Submersibles Design considerations must include operational maximums(depth, current, speed,)Considerations are made forinternal power distribution(lighting, propulsion, lifesupport, environmental control)Navigation, propulsionCommunicationsDepth monitoringBuoyancy/CG consideration33
Chamber Staffing NO specific recommendationsfor staffing levels Number of occupants rating Minimum flow ratings based onoperational needs foratmospheric and treatmentgases34
ONLY specific requirement:Hyperbaric Safety Director Safety Director, Facilitymanagement, and MedicalDirector responsible fordeveloping, adopting, andenforcing operationalprocedures Medical and Safety Directordevelop minimum staffqualifications based on:1.2.3.Number and type of chambersMaximum treatment capacityType of HBO therapy provided35
Multi-lockSupervisor/Operator2. Inside Tender3. Systems operator4. Diving Medical Officer1. Mono-lock/Multi-placeSupervisor/Operator2. Inside Tender3. Systems operator4. Diving Medical Officer1. er/system operator39
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Training and Certification42
Questions?
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Subsequent PVHO-1 revisions have addressed *Design and Use of Acrylic Viewports *Integral Piping System Design Requirement . 2 . Pressure Vessels for Human Occupancy ASME defines PVHO as a pressure vessel that encloses a human being within its pressure boundary while it is under internal or external pressure that exceeds a 2 psi differential pressure. PVHOs include, but are not limited to .
