Stay Compliant:
Alarm Integration and Regulatory Requirements for the BilgMon 488

A Technical Overview of Alarm Handling, Industry Standards, and International Regulations

Maintaining compliance with MARPOL and IMO requirements is essential for any vessel operating an oily water separator (OWS). The BilgMon 488 is designed to help shipowners, operators, and service engineers meet these requirements through intelligent alarm handling, integrated monitoring functions, and reliable logging of bilge water discharge events.

This article explains how local alarm integration works, why flow alarms matter, and how the BilgMon 488 ensures regulatory compliance across various international rules and classification standards.

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Martin Søvind Jensen

Product Manager

Tel: +45 2761 4502

Email: Martin.Sovind@insatech.com

Write to Martin

1. Why Alarm Integration Matters

Local Display or Engine Room Alarm Integration

Industry standards require that Oil Content Monitor (OCM) alarms must be:

Locally displayed, or
Integrated into the engine room alarm system

This ensures that crew members receive immediate notification in case of high oil content, system malfunction, or operational failures.

The BilgMon 488 (BilgMon Version 5) fully supports these requirements.
It provides:

A built-in LCD display on the MASTER unit
Clear visual and audible alarms
Full compatibility with the vessel’s engine control room alarm system
Automatic logging of alarm conditions for compliance documentation

2. Built-In Flow Alarm for Enhanced Safety

The BilgMon 488 MASTER unit incorporates an integrated flow switch, which ensures the monitor only analyses water when actual flow is present. This prevents false readings, protects the sensor unit, and ensures valid data logging.

On the latest BilgMon 488 version:

A flow alarm is treated like any other alarm
The screen displays “No flow”
The event is stored in the internal logbook

This log is essential for demonstrating compliance during Port State Control inspections or audits.

For more details about the system’s construction, see:

How the BilgMon 488 Is Constructed

3. MARPOL Requirements for 15 ppm Bilge Alarms

Under MARPOL Annex I, ships must comply with strict rules concerning bilge water discharge. These requirements vary depending on vessel size and operational area:

Ships ≥ 400 GT

Must be fitted with a bilge water separator.

Ships ≥ 10,000 GT

Must have both:

A bilge water separator, and
A 15 ppm bilge alarm

Ships 400–10,000 GT in “Special Areas”

These ships must also use a 15 ppm bilge alarm when operating in MARPOL-defined Special Areas:

The Mediterranean Sea
The Black Sea
The Baltic Sea & North West European waters
The Red Sea & Gulf of Aden
The Arabian/Persian Gulf
The Oman area of the Arabian Sea

For further details, reference Reg. 14 & 15 of MARPOL Annex I (Consolidated Edition 2006).

The BilgMon 488 fully supports compliance with these requirements through accurate turbidity measurement, integrated alarm logic, and IMO-approved data logging.

4. Compliance with IMO MEPC.107(49)

Vessels built after 2005 must comply with IMO Resolution MEPC.107(49), which specifies performance and approval requirements for:

Oily Water Separators
Filtering systems
15 ppm bilge alarms

Older ships (pre-2005) may continue operating equipment certified under earlier IMO regulations, but any replacement or retrofit must meet MEPC.107(49).

The BilgMon 488 is type-approved according to MEPC.107(49) and therefore meets all requirements for vessels built 2005 and later.

More information can be found in paragraph 1.3 of MEPC.107(49).