Protego® BE/HR-E-DN-IIB3

Common issues

• Corrosion or fouling of the flame-arrester element reducing free flow area
• Blockage or icing of the element in cold-climate or high-humidity cargo trades
• Sticking or seized pallets on the pressure/vacuum relief function, if combined with a P/V valve
• Gasket or seal degradation at flange connections leading to venting-system leaks
• Mechanical damage to the housing or flame screen following an over-pressurisation event
• Salt or particulate build-up on the element increasing back-pressure in the venting line

Inspection checklist

• Visually inspect the flame-arrester element for corrosion, deformation or blockage
• Check the free flow area of the element against the manufacturer's cleaning/renewal criteria
• Test the P/V function pallets for free movement and correct set pressure, if fitted
• Inspect housing and flange gaskets for leakage
• Confirm the DNV type-approval certificate and nameplate data match the installed unit
• Check drainage of condensate from the housing where applicable
• Verify correct orientation and support of the unit on the vent line

Service intervals

Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Flame-arrester element (crimped-ribbon insert)
• P/V pallet and seat set (if combined unit)
• Housing gasket set

Safety

• A degraded element can fail to stop flame propagation into the cargo tank - treat maintenance as safety-critical, not routine
• Work at the vent riser may involve a potentially flammable gas atmosphere - follow hazardous space entry procedures
• Incorrect reassembly (wrong element orientation, damaged gasket) can defeat the flame-arresting function without being visually obvious

Class survey

DNV type approval (TAP00000C9) ties the installed unit to a specific certified configuration; surveyors check that the nameplate matches the certificate and that the element has been maintained per the manufacturer's instructions - fitting a non-approved replacement element invalidates the certification.

Estimated lifetime: Not meaningfully expressed in running hours; service life is governed by element condition (corrosion, blockage) and is normally assessed at each annual tank venting system survey rather than by a fixed hour or year figure.