DNV manifold system — manifold technology for certified offshore gas handling
A DNV manifold system collects gas from cylinders or bundles and delivers it through isolation, regulation and safety devices that suit marine duty. REAL GAZ supplies systems designed for repeated lifting, vibration and salt exposure.
The aim is a supply that remains leak-tight and legible after months at sea, with components that technicians can service on deck.
The aim is a supply that remains leak-tight and legible after months at sea, with components that technicians can service on deck.
Reference documents include DNV-ST-E271, DNV 2.7-1, ISO 15649 piping, EN ISO 7291 manifold guidance and ISO 5817 weld quality levels.
In an offshore environment, manifold systems face challenges that onshore installations rarely meet. Constant vibration loosens threaded joints, so compression fittings and welded connections are preferred, and tubing is clamped at close intervals. Salt spray corrodes carbon steel and brass, so stainless steel, duplex or coated materials are chosen according to the location. Temperature swings between a cold deck at night and a sun-heated surface by day affect pressure readings, so gauges are specified with suitable ranges and liquid filling where appropriate. A system also needs clear labelling in the language of the crew, with flow arrows, gas names and pressure ratings visible from a distance. We work with the client's engineers to agree the scope, tag numbers and documentation before manufacturing begins.
🏭 Where Offshore Manifold Systems Are Used
- ⚙️ Utility gas distribution — manifolds provide instrument air and nitrogen across platform modules;
- 🔬 Blowout preventer testing — high-pressure nitrogen systems supply test equipment;
- 🏥 Chemical storage — inert blanketing manifolds protect tank contents from oxygen;
- 🚀 Marine laboratories — low-pressure manifolds feed analytical instruments in sea trials.
💡 Why Choose REAL GAZ
- ✅ Vibration tolerance — tube clamps and flexible hoses accommodate movement;
- 🧪 Corrosion allowance — 316L and duplex options are available for aggressive atmospheres;
- 🎯 Clear operation — colour-coded valves and labelled ports reduce errors;
- 🔒 Documentation pack — P&ID, parts list and test records are supplied;
- 📄 Certificate of Analysis (CoA) — supplied with every order.
🔬 Quality Control & Safety
- design review against project specification;
- weld inspection to the agreed quality level;
- hydrotest, drying and nitrogen purge;
- tagging and photographic record at dispatch.
Systems and cylinders are transported under ADR / UN rules and protected for marine shipping.
⚙️ Trusted Gas Solutions
For buyers in Azerbaijan, Turkey, Georgia, Uzbekistan and the USA, REAL GAZ can specify a DNV manifold system along with the gases it will carry, which keeps responsibility clear and shortens the lead time between order and deck.
REAL GAZ — marine-grade manifolds, marine-ready gas.