Air gauge 0.2 bar above normal / relief valve blowing
Hamworthy Super Trident ST6A, biological (aerobic) sewage treatment plant, imo mepc.2(vi)
Possible cause
Clogged diffuser elements or dirty filters
What to do
Manufacturer's manual, p. 59Replace diffuser elements and clean filter cartridges
See the assembly on the 3D model
Other Hamworthy Super Trident ST6A faults
Tank overflow / high level alarmDischarge pump failure, pipe blockage or excessive inflow (leaking WC flush valves)Bad smell from the unitAnaerobic tank: compressor, air-lifts or diffusers not working, or too much sludgePoor effluent qualityLack of oxygen, killed bacteria by disinfectant cleaners, sludge not returning, too much flushing waterScum on the settling tankSkimmer or air-lifts not workingFoaming in the aeration tank and ventToo much cleaning agentDischarge pump gives no flowClosed valves, blocked suction, air leaks or loops in suction pipeReduced or irregular pump dischargeChoked impeller, valve or non-return valve partly closed
From the manufacturer's manual “Sewage treatment plant manual”. Check against the original on board before work.