Gate Valves for Ammonia & Fertiliser Plants
High-pressure WC9 gate valves, LF2 ball valves, and NACE MR0103-compliant valves for ammonia synthesis loops, urea reactors, and fertiliser production systems.
Which gate valves are used for ammonia & fertiliser plants?
Ammonia synthesis and fertiliser manufacturing demand valves that withstand extreme pressure (150–300 bar synthesis loop), cryogenic NH₃ storage (−33°C), and highly corrosive urea melt (185°C). Vajra Industrial Solutions supplies the complete valve range - from synthesis loop block valves to urea high-pressure stripper isolation, prilling tower controls, and IBR-certified steam valves for the cogeneration plant - with NACE MR0103 and API 526 compliance documentation.
Gate Valve (A217 WC9)
High-temperature, high-pressure synthesis loop isolation; hydrogen service at 200–300 bar
Critical Requirements
- Hydrogen service valves must comply with NACE MR0103 (refinery sour service) - hardness limits on body, trim, and fasteners
- Ammonia service - extended bonnets for cryogenic applications below −29°C; fire-safe design per API 607
- Urea melt valves - SS316L trim with PTFE packing; no copper-based alloys (urea attacks copper)
- IBR certification for all steam valves above 3.5 kg/cm² - Form III-C material cert and Form III-E hydraulic test
- API 526 compliance for all pressure safety valves; back-pressure correction for superimposed back-pressure
- Anti-static and fire-safe design for liquid NH₃ storage valves - API 607 7th edition minimum
Service Challenges
- Anhydrous ammonia (NH₃) - corrosive to copper, zinc, and brass; requires steel or SS; stress corrosion cracking in high-strength steels
- Synthesis loop gas (N₂/H₂ 75:25) at 150–300 bar - hydrogen embrittlement risk; Nelson curve compliance per API 941
- Urea melt at 185°C - hydrolysis produces carbamate and CO₂; requires SS316L wetted parts
- Liquid CO₂ and carbamic acid in stripper - highly corrosive; duplex or SS316L minimum
- Steam at 40–100 bar - IBR compliance mandatory for all Indian plants
Vajra Gate Valves
Robust gate valves for full-flow isolation and on-off service in various industrial systems.
See the full Gate Valves rangeOther valves for ammonia & fertiliser plants
Gate Valves for other applications
Connected Engineering
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