Sea Fun Divers provides complimentary Enriched Air Nitrox (32% EANx) on all scheduled Phuket day boat trips for certified Nitrox divers
Repetitive Nitrogen Penalties on Phuket Multi-Dive Itineraries
Phuket day boat charters operate on intensive multi-dive schedules. A typical day trip covers three distinct open-water immersions:
The Deep Wreck / Pinnacle Profile: King Cruiser Wreck (30–32 m), Shark Point (24 m), and Koh Doc Mai (28m)
The Southern Island Profile: Racha Yai and Racha Noi multi-drop drifts
When breathing standard air (21% oxygen, 79% nitrogen), your body absorbs significant residual nitrogen during dive 1. On dive 2 and dive 3, this accumulated nitrogen drastically shrinks your allowable bottom time. Divers on standard air often find their dive computers approaching decompression limits within 15 to 20 minutes at moderate depths, forcing premature ascents to shallow depths while marine action remains below.
By lowering the nitrogen fraction from 79% to 68% with 32% Enriched Air Nitrox (EANx32), your tissues absorb nitrogen at a markedly slower rate. This provides substantial operational advantages:
- Extended Working Bottom Time: Up to 50% more no-decompression time on repetitive drops.
- Safer Conservative Margins: Diving a Nitrox mix while setting your dive computer to standard air provides a massive safety buffer against decompression sickness (DCS).
- Reduced Post-Dive Exhaustion: Divers consistently report lower physical fatigue at the end of a 3-dive day due to lower inert gas microbubble loads.
Commercial Surcharge Elimination: The Sea Fun Divers Advantage
Across Phuket and Chalong Pier, the industry-standard fee for Nitrox is an added surcharge of 250 THB to 350 THB per cylinder. On a standard 3-dive trip, this adds 750 THB to 1,050 THB per day on top of the base trip price.
Sea Fun Divers includes 32% Enriched Air Nitrox completely free of charge for all certified Nitrox divers on every scheduled day boat trip
Trips Covered: All Monday through Sunday schedules departing from Chalong Marina
Boat Layout: Our custom-built dive vessel is capped strictly at 20 divers, eliminating the chaotic cylinder confusion common on 60-diver commercial boats.
Guide Standard: Private, unhurried dive tour in small teams with a strict 4:1 diver-to-guide ratio.
Bottom Time Comparison: Air (21%) vs. Enriched Air (32%)
The table below illustrates the dramatic difference in No-Decompression Limits (NDL) for a first dive based on standard PADI/DSAT recreational dive models.
At 24 meters—the prime depth for observing leopard sharks at Shark Point or cruising the car deck of the King Cruiser—32% Nitrox delivers 15 additional minutes of no-decompression time on your first immersion alone. On dives 2 and 3, where residual nitrogen cuts air limits in half, EANx32 preserves full exploratory profiles.
| Depth (Meters / Feet) | Air (21% O₂) NDL | Nitrox (32% O₂) NDL |
|---|---|---|
| 18 m (60 ft) | 56 min | 95 min |
| 22 m (72 ft) | 37 min | 60 min |
| 24 m (79 ft) | 29 min | 44 min |
| 30 m (100 ft) | 20 min | 29 min |
Operational Gas Analysis and Logging Protocols
Safety on enriched air requires systematic verification. At Sea Fun Divers, gas blending and cylinder tracking adhere to stringent PADI 5-Star CDC standards.
| Step | Operational Protocol |
|---|---|
| Step 1: Calibrate | Calibrate digital O₂ analyser to 20.9% in ambient air. |
| Step 2: Analyse | Flow gas at a moderate, steady rate until reading stabilizes. |
| Step 3: Calculate | Verify Maximum Operating Depth: 33.8 m at 1.4 PO2. |
| Step 4: Log & Tag | Sign the boat gas logbook and complete the visual cylinder label. |
Personal Diver Analysis: Regulations and dive safety standards require every diver to personally analyse their own gas cylinders before departure.
Analyser Calibration: Calibrate the digital oxygen analyser to ambient atmospheric air (20.9% O₂) in a shaded, well-ventilated area on the dive deck.
Flow Measurement: Crack the tank valve gently and hold the analyser sensor against the valve orifice until the readout stabilises (target: 32% ± 1%).
MOD Verification: Compute and verify the Maximum Operating Depth (MOD):
At a recreational partial pressure of oxygen of 1.4 bar, the MOD for 32% Nitrox is strictly 33.8 meters (111 feet).
Cylinder Tagging & Boat Log Sign-off: Write the exact oxygen percentage, MOD, date, and your signature onto the cylinder visual inspection band, then enter the verification into the official Sea Fun Divers boat manifest log.
Fast-Track PADI Enriched Air Diver Speciality in Phuket
Divers who do not yet hold a Nitrox certification can complete the PADI Enriched Air (Nitrox) Speciality seamlessly alongside their scheduled day boat adventures
Because the PADI Enriched Air Speciality is a “dry” speciality, you can complete the digital eLearning before arriving in Phuket or at our dive centres at Le Méridien Phuket Beach Resort (Karon Noi) or Kata Beach
Not Certified Yet? Fast-Track Nitrox Speciality Onboard
Introduce the bridge to PADI Enriched Air (Nitrox) Speciality (Half-day dry certification for 6,500 THB + 4,500 THB student kit/PIC)
Highlight that non-certified divers can complete theory online or at our Kata Beach / Le Méridien hubs before departure, then analyse tanks and dive Nitrox on their second day
Frequently Asked Questions About Nitrox Diving in Phuket
Maximise Your Bottom Time with Free 32% Nitrox in Phuket
Dive longer, reduce fatigue over 3 dive days, and avoid extra cylinder surcharges. Experience Phuket’s premier dive sites with unmatched safety standards: strict 4:1 diver-to-guide ratio, 20-diver custom boat capacity, and complimentary 32% Enriched Air Nitrox on every scheduled day trip
Need your certification first? Complete the PADI Enriched Air (Nitrox) Speciality in just a half-day dry workshop before boarding
WhatsApp: +66 (0) 81 367 4542
Email: info@seafundivers.com
Dive Centres: Le Méridien Phuket Beach Resort (Karon Noi), Kata Beach, and Chalong Marina.
