DLSS Maintenance Flashcards
Who conducts systematic technical reviews and surveys a diving system to ensure that it will provide acceptable levels of safety throughout its specified operating range?
SCA (System Certifying Authority)
When will the SCA visit to conduct technical reviews or survey a diving system?
Upon request or every 3 years (normal interval)
Whats the purpose of QA in regards to DLSS Maintenance?
1) It’s safe to dive
2) It’s safe to operate
3) It protects you and your dive team
What systems have certifications?
1) Chambers
2) Piping/Valves
3) Flasks
4) Volume Tanks/Surge Tanks
5) Filters/Moisture Separators
6) Dryers/Dehydrators
7) Diver Handling Equipment
8) Electrical Services
What are the types certification?
1) Initial Certification
2) Re-certification
3) Continuance of certification
What constitutes an initial certification?
Completed on a NEW system prior to MANNED USE
What constitutes a re-certification?
A new certification of a diving system whose certification has been terminated due to…
1) Violations of a system limit
2) Expiration of a system certification
3) Modifications within the Scope of Certification (SOC) boundaries
4) Issuance of a 1A survey card
5) Casualty to system or occupants pending investigation
6) Failure to correct 1C survey cards by specific date or event
What constitutes a continuance of certification?
An extension by the SCA of the system certification period beyond that initially granted. Usually by letter.
What is a PSOB?
The Pre-Survey Outline Booklet (PSOB) serves as the foundation for initial certifications as well as certification and continuances.
What components are found in the PSOB?
1) Operating Parameters
2) Air/Gas/ O2 Supply Systems
3) Diver Handling System
4) Re-entry Control (REC) records (current cert period)
5) OP’s/EP’s
6) Sytem Drawings
7) PMS
8) Operational Demonstration/On-site Survey
What is an SCA?
The System Certifying Authority is the technical authority for all navy systems. He is responsible for inspecting and certifying systems for manned use.
What is NAVSEA - 00C4?
Afloat or portable systems
What is NAVFAC OFP-SCA?
Shore based facilities
Who is responsible for maintaining the DLSS in “as-built, as-certified” condition?
Diving Officer
What are Master Diver’s responsibilities in DLSS QA process?
1) Manages the daily operation and maintenance of all DLSS equipment
2) Reviews and signs RECs for opening and closing reviews
3) Responsible to the Diving Officer
What are the REC Supervisor’s responsibilities in the DLSS QA process?
1) Training DLSS Maintenance Technicians
2) Reviewing and signing RECs prior to upon completion of work
3) Maintaining all required documentation relating to DLSS maintenance
4) Be thoroughly familiar with all technical references that apply to the system
5) Responsible to Senior Diving Sup/ Master Diver
What are the DLSS Maintenance Technicians’s responsibilities in the DLSS QA process?
1) REC procedures
2) Documentation requirements
3) Preformance of maintenance IAW approved written procedure
4) Responsible to the DLSS Sup
When is a REC required?
For work on a system within the Scope of Certification (SOC)
What does a REC package provide written evidence of?
1) WHO authorizes work
2) WHY work is needed
3) WHAT work will be accomplished, including specific boundaries breached, manufacturing operations performed, and retest requirements
4) WHEN and WHERE the work will be accomplished, and by whom
5) Objective Quality Evidence (OQE), including new material acceptance and in-process testing and results
6) Compliance with applicable specifications, drawings, procedures, and instructions
How long are REC packages maintained for?
For the life of the system
What is the highest pressure that can exist in a system or subsystem under normal operating conditions?
(determined by the source)
Max Operating Pressure (MOP)
What is the approximate pressure a system operates while preforming its normal function?
(this pressure is used for system identification)
Normal Operating Pressure (NOP)
What is the maximum pressure that can exist in a system or subsystem during any condition?
(determined by relief valve setting)
Maximum System Pressure (10% over MOP)
What are the types of boundaries in a REC?
1) Work
2) Test
3) Isolation
What block are boundaries located in a REC form?
Block 9
What are work boundaries?
Work boundaries define the limits to which work was preformed.
Enter the FIRST stop valve upstream and downstream of the joint/component being entered.
What are test boundaries?
Test boundaries define the limits for testing to certify the work.
For LOW pressure systems, enter the FIRST stop valve upstream and downstream. For HIGH pressure systems, enter the FIRST AND SECOND valves upstream and downstream of the joint/component being entered.
What are isolation boundaries?
Enter the valves, switches or other components that must be verified as being open, shut, re-energized, etc.
Include the required position of each isolation component.
Ex. AHP-V-627 (SHUT)
What is a REC log?
A chronological list of all RECs including the REC number, system, open and close dates.
What is a REC form?
Authorizes a re-entry into a certified system. A completed form certifies the system is safe for manned use.
What is REC continuation page?
May be used to record supplemental data, references, parts/materials or procedures for a REC package.
What is a REC continuation page Rework?
Describes the reason for rework, and lists what steps of the procedure which will be repeated.
What are Test and Inspection Reports?
Used for operational testing, shop inspections, cleanliness inspections and other tests and inspections deemed necessary.
What are the types of Test and Inspection reports?
1) Joint Tightness Test
2) Valve Seat Tightness Test
3) Hydrostatic/ Pneumatic Test
4) System Drop Test
What is a Controlled Assembly Report?
Documents parts replacement, reuse, fastener, and sealing surface inspections, torque, software and lubricants.
What is a DFS Log?
Departure From Specifications (DFS) Log:
A chronological record of all DFS Reports
How long is the DFS Log retained for?
The life of the system
What is a DFS Report?
Departure From Specifications (DFS) Report:
Report used to request approval and clearance of all non-conformances to specifications.
What are the air system external cleanliness standards?
NSTM 505
What are the air system internal cleanliness standards?
MIL-STD 1622
What are the O2 system cleanliness standards?
MIL-STD 1330D
Where can O2 system cleaning be conducted?
In a “O2 clean area” as per MIL-STD 1330D
Where can air system cleaning be conducted?
In an area equivalent to a clean office environment and must not be open directly to the weather or an area where industrial work is taking place.
What is a Joint Tightness/Operating Pressure Test?
Preformed on remade threaded or bolted closures at maximum operating pressure
What is a Hydrostatic Pressure Test?
A system or portion of the system is pressurized above maximum operating pressure to a specified test pressure and inspected for leakage and measurable permanent damage.
When is a Recompression Chamber Air Pressure/Leak Test required?
1) Initial Certification
2) After repairs/overhauls
3) Every 2 years
What is a Compressor Efficiency Test?
Determines the efficiency of a compressor by comparing the actual volume of air a compressor produces with the rated output of that compressor.
What is a Receipt Inspection?
Check all parts received for:
1) Proper part numbers
2) Expired shelf life
3) Applicable cleanliness documents
4) Damaged packaging
5) Identification data must be compared with system specifications (drawings, tech manuals,etc)
What is a In-Process Inspection?
Visual inspections conducted and documented IAW applicable Test and Inspection Reports and the Controlled Assembly Report:
1) Surfaces
2) Soft goods (o-rings)
3) Threaded fasteners
4) Chamber view ports
5) Flask/housing/tanks
What are the visual inspection requirements for air systems?
Bright white light
What are the visual inspection requirements for O2 systems?
U.V. light and bright white light
What are the visual requirements for o-ring gland sealing surfaces?
Must meet surface finishes, be within dimensional tolerances and be free of surface defects
What are all of the System Certification Survey Cards?
1) Category 1A
2) Category 1B
3) Category 1C
4) Category 1D
5) Category II
What is a Category 1C Survey Card?
Corrective action must be accomplished prior to the date or event on the card
What is a Category 1D Survey Card?
Corrective action is required on one specific component. No time limit and certification remains intact.
What is a Category II Survey Card?
Corrective action is desirable, but not mandatory.
What is a Category 1A Survey Card?
Corrective action is required prior to manned use of the system. (Cert is blown and must be fully re-certified and have the suspension lifted by the SCA prior to future manned use of the system)
What is a Category 1B Survey Card?
Corrective maintenance is required prior to system certification. Manned uses may be authorized for the system by the SCA for system certification
