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The ECS WPNI Process

What is WPNI?


Simply stated, WPNI (wet pipe nitrogen inerting) is a process that displaces oxygen, which causes corrosion, with nitrogen gas inside wet pipe fire sprinkler systems. Any trapped gas remaining in the system after WPNI is not corrosive. Learn more about the science behind corrosion in wet pipe systems here.


ECS Nitrogen Inerting Vent (PAV-WN) and injection port facilitates WPNI process

ECS Nitrogen Inerting Vent (PAV-WN) and injection port facilitates WPNI process

What equipment is required for WPNI?


Three (3) essential components are required:
  1. An integral venting device to remove oxygen installed at a remote high point
  2. An injection port installed at the riser
  3. A source of nitrogen gas – either nitrogen generator or nitrogen cylinders

How do I know WPNI prevents corrosion?


ECS is the exclusive provider of WPNI technology with validated real world results – see our latest case study here. We utilize a patented “fill and purge” breathing process to immediately remove oxygen from the system and we offer the only in-situ corrosion monitoring device in the industry to ensure that corrosion remains under control.

How is WPNI performed?