Annually, the system should be inspected and the dry powder charge should be agitated with Nitrogen, using “bubbling” connections where provided.
Due to the powder’s affinity for moisture, any Nitrogen gas introduced for agitation must be moisture free.
In addition to the regular shipboard inspections, the systems should be inspected at least once every two years by an accredited service1 agent.
This inspection should include:
- Blow-through with air to ensure associated pipes and nozzles are clear.
- Operation test of local and remote controls and section valves.
- Contents verification of propellant gas cylinders containing Nitrogen (including remote operating stations).
Points to pounder:
The replenishment and test regime for these high-pressure Nitrogen cylinders is identical to that for CO2 cylinders for fixed-gas fire extinguishing systems.
You may also know about foam fire fighting system :
To include all foam types: FP; AFFF; FFFP; ARFFF
In addition to the regular shipboard inspections and where practicable the system should be tested to produce foam as often as possible in a drill scenario. Used concentrate should be replenished as required.
An analysis of foam samples for fixed and portable systems must be Under taken after 2 Years from date of manufacture and annually thereafter samples should be:
- As representative as practical, e.g. taken from top, middle and bottom of tanks where arrangement permits.
- Analysed by an independent or manufacturer’s laboratory and the results of analyses must be kept on board and readily available for inspection.