Felix Glass | Subsea Optical Dome Port FAQ Library

FELIX GLASS SUBSEA DOME FAQ3000m vs 7000m vs Flanged Optical Dome Port: How to Choose Subsea DomeSelecting 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 Products3000m Deep Sea Optical Dome Port7000m Ultra Deep Sea Optical Dome PortFlanged Optical Dome Port | Integrated One-Piece Flange Subsea Dome Get Custom Dome Recommendation & Quotation Share your operating depth, housing design and optical requirements. We help select and quote the right subsea dome port. Submit Your Project Specs Related FAQ: What material is best for subsea optical dome port?Related FAQ: What is FEA simulation for subsea dome port?Related FAQ: Standard Dome vs Integrated Flanged Dome PortRelated FAQ: Safety Factor for Deep Sea Optical Dome PortsRelated FAQ: Subsea LiDAR Optical Dome Port RequirementsRelated FAQ: Can subsea optical dome port be repaired after scratch?Main FAQ Library: Subsea Optical Dome Port FAQ Library

FELIX GLASS SUBSEA DOME FAQCan subsea optical dome port be repaired after scratch?Minor surface scratches affect optical performance and may create coating failure points. Repair feasibility depends on scratch depth, substrate material and optical tolerance requirements.Scratch repair rules Very shallow surface scratches: can be re-polished, but material removal will alter dome radius and dimensional tolerance. Deep scratches, cracks or chips: cannot be repaired; dome replacement required. AR coating damage: full recoating is possible only after surface refinishing. Material differenceSapphire is harder and more scratch resistant than fused silica. But once deep scratches form on sapphire, re-polishing takes longer and costs more.Important WarningRe-polishing changes wall thickness. If the dome is pressure-rated for deep sea, rework may reduce safety factor and invalidate FEA / hydrostatic test certification.FAQQ: Can deep scratches on sapphire dome be fixed?A: Deep scratches or cracks cannot be repaired, replacement is needed.Q: Will re-polishing affect pressure rating?A: Yes, material removal reduces wall thickness, may lower safety factor and void certification.Q: Can I re-coat only the damaged area?A: No, AR coating needs full surface stripping and re-deposition for uniform performance.Related Subsea Dome Products3000m Deep Sea Optical Dome Port7000m Ultra Deep Sea Optical Dome PortFlanged Optical Dome Port | Integrated One-Piece Flange Subsea Dome Evaluate Repair Feasibility For Your Damaged Dome Send photos of your damaged dome, we evaluate if repair is feasible. Submit Dome Photos Related reading: What material is best for subsea optical dome port?Related reading: What is AR coating on subsea optical dome port?Related reading: Optical Dome Diameter Tolerance & Surface SpecificationsRelated FAQ: Subsea Optical Dome Port FAQ Library

FELIX GLASS SUBSEA DOME FAQSubsea LiDAR Optical Dome Port RequirementsSubsea LiDAR systems have stricter optical requirements compared to regular underwater cameras. Dome ports for LiDAR need controlled transmission at laser wavelength, low wavefront distortion and high pressure resistance.Core Requirements for LiDAR Dome Match substrate material to LiDAR operating wavelength Custom single-band or broadband AR coating for laser wavelength Tight surface figure and low wavefront error to avoid beam distortion High compressive strength for deep water pressure Low bubble and inclusion inside optical blank Material Selection JGS1 Fused Silica: great for visible and near-infrared LiDAR at 3000m C-axis Sapphire: preferred for 7000m LiDAR with high mechanical reliability Design TipsLiDAR domes often require tighter optical tolerances. FEA simulation is strongly recommended even for 3000m rated LiDAR domes.FAQQ: Can your dome work for underwater LiDAR?A: Yes, we customize optical domes specially for subsea LiDAR sensors.Q: What AR coating is needed for LiDAR dome?A: AR coating must be optimized for your LiDAR laser wavelength, not general visible broadband coating.Q: Is flanged dome suitable for subsea LiDAR?A: Yes, integrated flanged dome is widely adopted for high-reliability subsea LiDAR housings.Related Subsea Dome Products3000m Deep Sea Optical Dome Port7000m Ultra Deep Sea Optical Dome PortFlanged Optical Dome Port | Integrated One-Piece Flange Subsea Dome Get Custom Quotation for Subsea LiDAR Dome Share LiDAR wavelength and maximum operating depth for custom dome quotation. Submit Your LiDAR Specs Related reading: What is AR coating on subsea optical dome port?Related reading: What material is best for subsea optical dome port?Related reading: What is FEA simulation for subsea dome port?Related FAQ: Subsea Optical Dome Port FAQ Library

FELIX GLASS SUBSEA DOME FAQSafety Factor for Deep Sea Optical Dome PortsSafety factor is the ratio between material failure load and actual working hydrostatic pressure. It is the core design parameter to avoid dome cracking under deep ocean pressure, cyclic loading and unexpected pressure spikes.Recommended Safety Factor 3000m (300 bar) long-term deployment: minimum safety factor 1.5 7000m (700 bar) abyssal long-term mission: minimum safety factor 2.0 Why safety factor mattersOcean equipment faces cyclic dive-ascent pressure, vibration, minor material defects and temperature variation. A safety margin prevents sudden brittle fracture during field operation.How we validate safety factorFEA finite element simulation calculates peak stress and checks safety factor in design phase. For 7000m domes, FEA with safety factor validation is mandatory before machining.FAQQ: Can I use safety factor 1.2 for 7000m dome?A: Not recommended. 7000m abyssal application requires minimum safety factor of 2.0 for reliable long-term service.Q: Is safety factor calculated in FEA report?A: Yes, our FEA results include safety factor analysis for critical stress hotspots.Q: Does flanged dome need higher safety factor?A: Same safety factor standard applies, but FEA must check stress at dome-flange transition zone.Related Subsea Dome Products3000m Deep Sea Optical Dome Port7000m Ultra Deep Sea Optical Dome PortFlanged Optical Dome Port | Integrated One-Piece Flange Subsea Dome Get Safety Factor Evaluation For Your Dome Project Tell me your operating depth and mission profile to get safety factor evaluation. Submit Your Mission Profile Related reading: What is FEA simulation for subsea dome port?Related reading: Hydrostatic Pressure Test for Subsea Dome PortRelated reading: Standard Dome vs Integrated Flanged Dome PortRelated reading: Optical Dome Diameter Tolerance & Surface SpecificationsRelated FAQ: Subsea Optical Dome Port FAQ Library

FELIX GLASS SUBSEA DOME FAQOptical Dome Diameter Tolerance & Surface SpecificationsPrecision dimensional and optical surface specifications directly affect assembly fit, sealing performance and imaging quality for subsea dome ports.Diameter ToleranceStandard diameter tolerance range for our domes (20mm–60mm): ±0.02mm. Tighter tolerance down to ±0.005mm can be customized upon request for high-precision sensor applications.Optical Surface Quality Standard scratch & dig: 60/40 High precision option: 40/20 for high-end camera and LiDAR systems Surface FigureDefault surface figure: λ/2 @632.8nm. λ/4 or λ/8 is available as upgrade for high-performance optical systems.Key NotesFlanged domes require extra flatness control on flange sealing face to guarantee uniform O-ring compression and prevent water leakage.FAQQ: What is your default diameter tolerance?A: ±0.02mm for 20–60mm dome diameter. Tighter tolerance can be customized.Q: What scratch-dig grade do you offer?A: Standard 60/40, upgraded 40/20 for premium optical systems.Q: Does flange face have flatness requirement?A: Yes, flange flatness is critical for sealing. We can control flatness per your drawing requirement.Q: Can you provide inspection report for dimensions?A: Yes, dimensional inspection report can be supplied with shipment.CTA: Share your tolerance and optical surface requirements for quotation.Related Subsea Dome Products3000m Deep Sea Optical Dome Port7000m Ultra Deep Sea Optical Dome PortFlanged Optical Dome Port | Integrated One-Piece Flange Subsea Dome Submit Your Tolerance & Optical Surface Requirements Share your tolerance and optical surface requirements for quotation. Send Your Optical Spec Related reading: Standard Dome vs Integrated Flanged Dome PortRelated reading: Subsea Optical Dome Port Lead Time & MOQRelated reading: Hydrostatic Pressure Test for Subsea Dome PortRelated reading: What material is best for subsea optical dome port?Related FAQ: Subsea Optical Dome Port FAQ Library

Subsea Optical Dome Port Lead Time & MOQAll of our subsea optical dome ports are custom machined to customer drawings, no off-the-shelf stock available. Lead time varies based on depth rating, geometry complexity, FEA simulation and optional surface treatment.MOQ Rules Mass production MOQ: 5 pieces Prototype order: 1 piece available for engineering validation Standard Lead Time Breakdown 3000m standard dome / 3000m flanged dome: 3–5 weeks 7000m standard dome /7000m flanged dome: 4–6 weeks (includes mandatory FEA simulation) Factors that extend lead time Custom broadband AR anti-reflection coating Hydrostatic pressure test with formal certification Complex flange bolt patterns or tight tolerance requirements Special raw material blank procurement FAQQ: Can I order only 1 piece for prototype testing?A: Yes, 1pc prototype is supported for mechanical and optical verification. Mass production requires minimum 5pcs.Q: Are your dome ports in stock ready to ship?A: No, all domes are custom manufactured per customer specifications.Q: Does AR coating add extra production time?A: Yes, optical coating process will add 5–7 working days.Q: Can you expedite dome production for urgent projects?A: Rush order is available upon review, extra cost may apply.CTA: Send your dome specs to get exact lead time and quotation.Related Subsea Dome Products3000m Deep Sea Optical Dome Port7000m Ultra Deep Sea Optical Dome PortFlanged Optical Dome Port | Integrated One-Piece Flange Subsea Dome Get Exact Lead Time & Quotation Send your dome specs to get exact lead time and quotation. Submit Your Dome Specifications Related reading: What is FEA simulation for subsea dome port?Related reading: Hydrostatic Pressure Test for Subsea Dome PortRelated reading: Standard Dome vs Integrated Flanged Dome PortRelated reading: Optical Dome Diameter Tolerance & Surface SpecificationsRelated FAQ: Subsea Optical Dome Port FAQ LibraryRelated reading: 3000m vs 7000m vs Flanged Optical Dome Port: How to Choose Subsea Dome

FELIX GLASS SUBSEA DOME FAQStandard Dome vs Integrated Flanged Dome PortTwo major dome mechanical designs for subsea imaging systems: standalone standard dome and monolithic integrated flanged dome port. The core difference is assembly method and sealing interface count.Standard standalone dome portStandard hemispherical dome requires separate retainer ring to clamp it onto housing. It works well to retrofit existing housings. More assembly steps and one sealing interface between dome and retainer.Integrated flanged dome portDome and mounting flange machined from single optical blank. Direct bolt-on installation without retainer ring. Only one sealing surface on flange face, fewer leakage paths. Best for new housing design and high reliability missions.Side-by-side summary Standard dome: lower machining cost, fit existing retainer housing, slightly higher leakage risk under cyclic pressure Flanged dome: higher machining cost, simpler assembly, lower leakage risk, custom flange bolt pattern required FAQQ: Which one has lower leakage risk?A: Integrated flanged dome port has fewer sealing interfaces, so lower leakage risk.Q: Can flanged dome fit my existing housing?A: Only if flange OD, bolt circle and O-ring step match your housing drawing.Q: Both support 3000m and 7000m rating?A: Yes, we can produce flanged dome for both depth ratings.CTA: Share your housing drawing, we advise whether standard or flanged dome fits better.Related Subsea Dome Products3000m Deep Sea Optical Dome Port7000m Ultra Deep Sea Optical Dome PortFlanged Optical Dome Port | Integrated One-Piece Flange Subsea Dome Need Advice on Dome Type Selection? Share your housing drawing, we advise whether standard or flanged dome fits better. Submit Your Housing Drawing Related reading: What is FEA simulation for subsea dome port?Related reading: Hydrostatic Pressure Test for Subsea Dome PortRelated reading: Standard Dome vs Integrated Flanged Dome PortRelated reading: Optical Dome Diameter Tolerance & Surface SpecificationsRelated FAQ: Subsea Optical Dome Port FAQ LibraryRelated reading: 3000m vs 7000m vs Flanged Optical Dome Port: How to Choose Subsea Dome

FELIX GLASS SUBSEA DOME FAQHydrostatic Pressure Test for Subsea Dome PortHydrostatic pressure test is physical pressure testing to verify the optical dome can withstand its rated water depth pressure before deployment. It is an optional validation step after optical polishing.How hydrostatic test worksThe dome sample is placed inside pressure chamber, pressurized to target pressure (300 bar for 3000m,700 bar for 7000m), hold for specified duration, then inspect for crack, leakage or permanent deformation.What you get after testWe can issue official hydrostatic test certificate for equipment qualification, third-party audit and marine project documentation.Important limitationHydrostatic test only validates static pressure resistance. It cannot fully replicate cyclic pressure, vibration and marine biofouling in real deep ocean environment, so sufficient safety factor is still required.FAQQ: Is hydrostatic test mandatory for all dome orders?A: No, it is optional. FEA simulation is mandatory for all 7000m dome before machining.Q: Can you test flanged dome port?A: Yes, integrated one-piece flanged domes can go through hydrostatic pressure test.Q: Will the test damage the optical surface?A: Properly performed pressure test will not damage dome optics.Q: What certificate is available after testing?A: We can provide formal pressure test report and certification document.CTA: Tell us your pressure test requirement, get quotation for dome port with hydrostatic validation.Related Subsea Dome Products3000m Deep Sea Optical Dome Port7000m Ultra Deep Sea Optical Dome PortFlanged Optical Dome Port | Integrated One-Piece Flange Subsea Dome Request Hydrostatic Pressure Validation For Your Dome Tell us your pressure test requirement, get quotation for dome port with hydrostatic validation. Send Your Test Spec Related reading: What is FEA simulation for subsea dome port?Related reading: Hydrostatic Pressure Test for Subsea Dome PortRelated reading: Standard Dome vs Integrated Flanged Dome PortRelated reading: Optical Dome Diameter Tolerance & Surface SpecificationsRelated FAQ: Subsea Optical Dome Port FAQ LibraryRelated reading: 7000m Ultra Deep Sea Optical Dome Port Guide

What is AR coating on subsea optical dome port?AR coating, or anti-reflection coating, is a thin multi-layer optical film deposited on dome surfaces. It reduces light reflection loss and boosts light transmission for subsea cameras, LiDAR and optical sensors.Key benefits of AR coating for underwater dome Higher optical transmission, brighter image for low-light deep sea environment Reduce ghost image and flare Custom coating for target spectrum: visible light, near infrared or multi-band Important notes for subsea AR coatingYou must specify your working wavelength range before coating. Wrong wavelength coating will not deliver expected optical performance. AR coating is optional for dome ports, not standard default.AR coating is available on both JGS1 fused silica and C-axis sapphire dome substrates.FAQQ: Is AR coating standard included on your domes?A: No, AR coating is an optional add-on service.Q: Can AR coating work for both visible and infrared?A: Yes, multi-band broadband AR coating can cover combined spectrum.Q: Does seawater damage AR coating?A: Our marine-grade AR coating has good seawater resistance for subsea service.Q: Can we add AR coating on flanged optical dome?A: Yes, integrated flanged dome supports AR coating.CTA: Share your working wavelength requirement, get quotation for subsea dome with AR coating.Related Subsea Dome Products3000m Deep Sea Optical Dome Port7000m Ultra Deep Sea Optical Dome PortFlanged Optical Dome Port | Integrated One-Piece Flange Subsea Dome Get Quotation for Subsea Dome with AR Coating Share your working wavelength requirement, get quotation for subsea dome with AR coating. Send Your Wavelength Spec Related reading: What is FEA simulation for subsea dome port?Related reading: Hydrostatic Pressure Test for Subsea Dome PortRelated reading: Standard Dome vs Integrated Flanged Dome PortRelated reading: Optical Dome Diameter Tolerance & Surface SpecificationsRelated FAQ: Subsea Optical Dome Port FAQ LibraryRelated reading: 3000m Deep Sea Optical Dome Port Guide

What is FEA simulation for subsea dome port?FEA (Finite Element Analysis) simulation is a computer-based stress simulation to predict stress distribution, peak pressure load and crack risk on optical dome ports under deep-sea hydrostatic pressure.Why run FEA for subsea dome port?Underwater dome failure usually occurs at stress hotspots, especially the dome root, or the transition area between hemisphere and flange for integrated flanged domes. FEA helps engineers optimize wall thickness and geometry before cutting optical blank, avoiding costly prototype cracking.When FEA is mandatory or recommended? All 7000m rated dome ports: FEA simulation mandatory before machining 3000m dome ports for long-term deployment: FEA strongly recommended Integrated flanged dome: extra check for dome-flange transition stress What will FEA report include? Full stress contour map under rated hydrostatic pressure Identify peak stress locations Calculate safety factor against material failure Geometry optimization suggestions Common wrong assumptionYou cannot simply scale up 3000m dome wall thickness and use it directly for 7000m application. Pressure stress does not increase linearly. FEA is required for every new geometry.FAQQ: Is FEA required for 3000m subsea dome?A: Not mandatory, but strongly recommended for long cycle dive missions to improve reliability.Q: Do you provide FEA report for dome orders?A: Yes, FEA document will be delivered together for all 7000m dome projects.Q: Can flanged dome skip FEA simulation?A: No, flanged dome has critical transition zone; 7000m flanged dome requires FEA.Q: Does FEA replace hydrostatic pressure test?A: No. FEA is simulation in design phase. Hydrostatic test is physical verification after manufacturing.CTA: Send your dome drawing, we run FEA stress analysis and DFM review for your subsea dome port.Related Subsea Dome Products3000m Deep Sea Optical Dome Port7000m Ultra Deep Sea Optical Dome PortFlanged Optical Dome Port | Integrated One-Piece Flange Subsea Dome Need FEA Stress Analysis & DFM Review For Your Subsea Dome? Send your dome drawing, we run FEA stress analysis and DFM review for your subsea dome port. Submit Your Dome Drawing Related reading: What is FEA simulation for subsea dome port?Related reading: Hydrostatic Pressure Test for Subsea Dome PortRelated reading: Standard Dome vs Integrated Flanged Dome PortRelated reading: Optical Dome Diameter Tolerance & Surface SpecificationsRelated FAQ: Subsea Optical Dome Port FAQ LibraryRelated reading: Integrated Flanged Optical Dome Port: Benefits & Engineering Guide

What material is best for subsea optical dome port?Selecting the right substrate is critical for subsea dome port performance, pressure resistance and service life. The three common optical materials are C-axis Sapphire, JGS1 Fused Silica and BK7 optical glass. Acrylic is not recommended for deep-water pressure applications.C-axis SapphireSapphire is the top choice for 7000m abyssal deployment. It features outstanding compressive strength, excellent scratch resistance and stable optical transmission under high hydrostatic pressure. It resists seawater corrosion well. The main downside is higher raw material and machining cost.JGS1 Fused SilicaJGS1 fused silica is ideal for 3000m mid-depth ROV and AUV projects. It delivers balanced optical performance, good seawater resistance and competitive pricing. For 7000m service, fused silica dome needs reinforced wall geometry and full FEA validation before production.BK7 Optical GlassBK7 has lower compressive strength. It is only acceptable for short-duration, shallow-water missions with strict annealing treatment. Not suitable for 7000m ultra-deep use.Acrylic PMMAAcrylic suffers creep deformation under high pressure. It is forbidden for 3000m and 7000m subsea dome applications.Quick Material Selection Guide 7000m long-term deep sea → C-axis Sapphire 3000m commercial inspection ROV → JGS1 Fused Silica Short mission, limited budget, shallow depth only → BK7 (with limitation) FAQQ: Is sapphire better than fused silica for underwater dome?A: Sapphire has superior compressive strength for ultra-deep 7000m. Fused silica offers cost advantage for mid-depth 3000m projects.Q: Can BK7 glass be used for 7000m dome port?A: No, BK7 does not have enough compressive strength for 700 bar pressure.Q: Does seawater corrode fused silica or sapphire?A: Both materials have excellent resistance to seawater corrosion.Q: Can we add AR coating on sapphire and fused silica domes?A: Yes, broadband AR anti-reflection coating can be applied on both substrates.Q: Are your dome ports custom size?A: Yes, custom diameter from 20mm to 60mm available.CTA: Tell us your working depth and target wavelength, our engineers recommend suitable material for your optical dome port.Related Subsea Dome Products3000m Deep Sea Optical Dome Port7000m Ultra Deep Sea Optical Dome PortFlanged Optical Dome Port | Integrated One-Piece Flange Subsea Dome Need Custom Subsea Optical Dome Port? Tell us your working depth and target wavelength, our engineers recommend suitable material for your optical dome port. Get Material Recommendation Related reading: What is FEA simulation for subsea dome port?Related reading: Hydrostatic Pressure Test for Subsea Dome PortRelated reading: Standard Dome vs Integrated Flanged Dome PortRelated reading: Optical Dome Diameter Tolerance & Surface SpecificationsRelated FAQ: Subsea Optical Dome Port FAQ LibraryRelated reading: 3000m vs 7000m vs Flanged Optical Dome Port: How to Choose Subsea Dome