NAB Gate Valve – API 600 for Seawater
Nickel Aluminium Bronze (NAB) gate valves manufactured to API 600 standard for continuous seawater service. Body material ASTM B148 C95800. Pressure Class 150. Sizes from 1/2" to 12". Ideal for desalination plants, offshore platforms, marine vessels, and seawater cooling systems.
Quick Summary
NAB Gate Valve = Gate valve made from Nickel Aluminium Bronze (ASTM B148 C95800). Used for seawater because NAB resists corrosion, erosion, and biofouling. API 600 design standard. Class 150 pressure rating. Available 1/2" to 12". Typical applications: desalination, offshore oil & gas, marine, power plant seawater cooling.
Key Specifications
Export Ready: Supplied to Hyundai Engineering, SWCC, DEWA, Petrofac, and major EPC contractors. EN 10204 3.1 MTCs. Third-party inspection supported.
What is NAB (Nickel Aluminium Bronze)?
Nickel Aluminium Bronze (NAB), designated as ASTM B148 C95800, is a copper-based alloy specifically engineered for seawater applications. It contains approximately:
- Copper: 79% minimum (base metal)
- Aluminium: 8.5-9.5% (corrosion resistance)
- Nickel: 4-5% (strength & toughness)
- Iron: 3.5-4.5% (erosion resistance)
- Manganese: 0.8-1.5% (castability)
Why NAB for Seawater?
- Corrosion Resistant: Excellent resistance to seawater, brackish water, and chlorides
- Anti-Biofouling: Natural resistance to marine organism attachment
- Erosion Resistant: Withstands high-velocity seawater flow
- Self-Healing: Protective oxide layer reforms if damaged
- High Strength: 585 MPa tensile, 240 MPa yield
Technical Specifications
Dimension Table – API 600 Class 150
Test Pressure (API 598)
Shell Test
32 kg/cm²
425 PSIG (Hydraulic)
Seat Test
22 kg/cm²
285 PSIG (Hydraulic)
Pneumatic Test
7 kg/cm²
100 PSIG
Applications
Desalination Plants
SWRO, MSF, MED
Offshore Platforms
FPSO, Rigs
Marine / Shipbuilding
Ballast, Cooling
Power Plants
Seawater Cooling
Aquaculture
Fish Farms
Naval / Defense
Warships, Submarines
Frequently Asked Questions
What is a NAB gate valve?
A NAB gate valve is a gate valve with body and trim made from Nickel Aluminium Bronze (NAB), specifically ASTM B148 C95800. NAB provides exceptional resistance to seawater corrosion, erosion, and biofouling, making it the preferred material for marine and desalination applications.
Why use NAB gate valves for seawater?
NAB gate valves are ideal for seawater because of: (1) Excellent corrosion resistance, (2) Natural anti-biofouling properties, (3) High erosion resistance in flowing seawater, (4) Self-healing oxide layer, (5) Superior to stainless steel in chloride environments.
What is ASTM B148 C95800?
ASTM B148 C95800 is the specification for Nickel Aluminium Bronze castings. Composition: Cu 79% min, Al 8.5-9.5%, Ni 4-5%, Fe 3.5-4.5%, Mn 0.8-1.5%. Tensile strength: 585 MPa. Yield strength: 240 MPa. Widely used for seawater valves and marine hardware.
What sizes are available?
NAB gate valves per API 600 are available from 1/2" (DN15) to 12" (DN300). Common sizes: 1/2", 1", 1-1/2", 2", 3", 4", 6", 8". Larger sizes up to 24" on request. Pressure Class 150 standard, Class 300 available.
Pricing – Gate Valve (Class 150)
Indicative unit prices in INR (ex-works India). Includes hydrostatic testing and EN 10204 3.1 MTCs. Volume discounts available for project quantities.
* Prices are indicative and subject to change. Contact us for confirmed pricing and delivery schedules. GST extra as applicable.
Need NAB Gate Valves for Your Seawater Project?
We supply to major EPC contractors including Hyundai Engineering, Petrofac, Saipem, and more. EN 10204 3.1 MTCs. Third-party inspection available.