FELIX GLASS SUBSEA DOME FAQ

3000m vs 7000m vs Flanged Optical Dome Port: How to Choose Subsea Dome

Selecting the correct subsea optical dome port requires balancing operating depth, mechanical reliability, optical performance, assembly design, project budget and mission criticality. This FAQ summarizes core tradeoffs between 3000m rated dome, 7000m rated dome, standard standalone dome and monolithic integrated flanged dome port.

Q1: What are the differences between 3000m and 7000m subsea dome ports?

3000m (300 bar) dome: Widely used for mid-depth ROV inspection, underwater camera and shallow subsea LiDAR. JGS1 fused silica is the common substrate. Minimum safety factor 1.5 for long-term deployment. FEA simulation is optional but strongly recommended for LiDAR domes. Standard standalone dome is cost-effective for retrofitting existing housings.

7000m (700 bar) ultra-deep dome: Designed for abyssal missions, requires C-axis sapphire for superior compressive strength. FEA simulation with safety factor validation is mandatory before machining. Minimum safety factor 2.0 for long-term dive cycles. Integrated flanged dome is preferred to minimize sealing interfaces and leakage risk. Production lead time is longer due to FEA, thicker wall and stricter mechanical validation.

Q2: Standard dome vs integrated flanged dome, which one should I pick?

Standard hemispherical dome: Uses separate retainer ring for mounting. Lower machining cost, ideal when you already have existing housing retainers. It has one extra sealing interface with slightly higher cyclic-pressure leakage risk.

Integrated flanged dome: Machined from a single optical blank. Direct bolt-on installation without retainer ring. Only one sealing surface on flange face, fewer leakage paths. Best for new housing development and high-reliability deep sea projects. Custom flange bolt circle and O-ring step can be manufactured per your drawing.

Q3: Quick selection checklist for subsea dome port

• Operating depth ≤3000m, existing housing: Standard fused silica dome
• Operating depth ≤3000m, new housing & high reliability: Flanged fused silica dome
• Operating depth up to 7000m, any new housing: Flanged sapphire dome
• Subsea LiDAR application: Tight optical specs, custom laser AR coating, FEA recommended regardless of depth
• Budget limited, retrofit project: Standard dome with standard optical specs

Q4: What other parameters should I consider besides depth and dome type?

Optical specifications (scratch-dig grade, surface figure, diameter tolerance), AR coating, hydrostatic pressure certification, lead time and MOQ also affect your final selection. Damaged domes with deep scratches or cracks cannot be repaired and need replacement; minor shallow scratches may be re-polished but pressure certification may become invalid.

Q5: Which dome type is best for 7000m project?

A: Integrated flanged sapphire dome with mandatory FEA validation is the top recommendation for 7000m long-term missions.

Q6: Can I use flanged dome on my existing housing?

A: Only if flange OD, bolt circle and O-ring sealing step match your housing drawing.

Q7: What material should I pick for 3000m LiDAR dome?

A: JGS1 fused silica with laser-tuned AR coating is commonly used for 3000m subsea LiDAR.

Q8: Is hydrostatic test required for all orders?

A: Hydrostatic pressure test is optional certification. FEA is mandatory for all 7000m dome manufacturing.

Related Subsea Dome Products

3000m Deep Sea Optical Dome Port

7000m Ultra Deep Sea Optical Dome Port

Flanged Optical Dome Port | Integrated One-Piece Flange Subsea Dome

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Main FAQ Library: Subsea Optical Dome Port FAQ Library