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newSchoolWorks.com › VoTechWorks › Transportation › Maritime Crew (deck/engine) › Watchkeeping: Deck and Engine Room Duties › Lesson 3
TRN-MARI24-06 · Lesson 3 · 10 clock hours · practice

Engine-Room Rounds, Log Entries, and Machinery Monitoring

Objective. Students will conduct a complete engine-room round using a standard checklist, record all required machinery parameters in the engine-room log in the correct format, and correctly identify at least three abnormal readings that would require notification of the watch engineer.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a certified examiner or master technician in the trade or by a certification or approval body. It is a study draft and may contain errors. Do not use it as instructions for work on a job site or on live equipment. Always follow your instructor, your supervising professional, and current official references and regulations.

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Why Engine-Room Rounds Matter

An engine-room round is a systematic, scheduled walk-through of the machinery spaces in which a watchkeeper physically inspects, reads, and records the operating parameters of every major system. Rounds are not optional—they are required by STCW watchkeeping standards and by company Safety Management Systems (SMS). A gauge reading that drifts out of range minutes before an alarm sounds is exactly the kind of early warning a thorough round is designed to catch. Missing it can mean an engine casualty, a fire, flooding, or loss of propulsion.

At the QMED (Qualified Member of the Engine Department) level, your job is to observe and report accurately. You do not make engineering decisions, but you are the eyes and ears of the watch engineer. Precise log entries and prompt reporting of abnormal readings are your most important responsibilities.

Personal Protective Equipment and Safety Before You Start

Before entering the engine room, put on all required PPE: hearing protection (the main engine space typically exceeds safe noise exposure limits), safety glasses, and steel-toed boots. Gloves should be available for handling hot components or chemical service. Never bypass a safety device, remove a guard, or reach into rotating machinery. Follow lockout/tagout (LOTO) procedures any time machinery must be isolated for inspection or maintenance—confirm with the watch engineer before touching any isolating valve or electrical disconnect. Be aware of hot surfaces, high-pressure steam and fluid lines, and slippery deck plates. Know the location of the nearest fire extinguisher, emergency shutdown station, and escape route before every round.

Major Machinery Stations and What to Monitor

Main Engine (propulsion diesel or turbine): Read cylinder exhaust temperatures (each unit), jacket cooling water inlet/outlet temperatures, lube oil pressure and temperature, fuel oil pressure, RPM (revolutions per minute), and turbocharger speed if displayed. Temperatures that are significantly higher on one cylinder than the others, or lube oil pressure that is trending downward, are red flags.

Auxiliary Engines (generators): Record load (kW or amperes), voltage, frequency, cooling water temperature, lube oil pressure, and exhaust temperature. Verify fuel supply is adequate and no alarms are lit.

Boilers and Economizers: Check steam pressure, feed water level in the gauge glass, fuel supply pressure, and burner flame status. A low water level in a boiler is an emergency—notify the watch engineer immediately.

Fuel Oil Service Systems: Record service tank levels, fuel oil temperature (heavy fuel oil must be heated to the correct viscosity before injection), fuel oil pressure, and purifier/separator operation. Watch for leaks on fuel lines—a fuel spray near a hot surface is a fire hazard.

Cooling Water Systems: Read sea water (jacket water) and fresh water temperatures and pressures. Check sea chests and strainers for blockage indicators.

Lube Oil Systems: Note sump levels, filter differential pressure, and temperature. A rising differential pressure across a filter means it needs cleaning before bypass occurs.

Bilge Systems: Inspect bilge wells for accumulation. Bilge water containing oil must not be overboard-discharged without processing through the oily water separator (OWS) and must comply with MARPOL requirements. Record bilge well levels and any pumping actions in the log.

Reading Instruments Correctly

Always read an analog gauge at eye level to avoid parallax error. For digital readouts, confirm the unit of measure displayed matches what the log requires. Common units you will record: pressure in psi or bar, temperature in °F or °C (know which your vessel uses), flow in GPM or m³/h, electrical values in kW, V, and Hz. If a gauge needle is vibrating heavily or pinned at maximum, report it—do not simply write a number.

Engine-Room Log Entries

The engine-room log is a legal document. Entries must be:

Complete every field on the log form. An omission is not acceptable—if a system is secured (shut down), write "secured" in that field rather than leaving it blank.

Identifying and Escalating Abnormal Readings

An abnormal reading is any value outside the normal operating range posted at the station or listed in the machinery manual. Common examples: lube oil pressure below the minimum alarm set-point, a cylinder exhaust temperature significantly higher than adjacent cylinders, or a fuel service tank level that has dropped faster than expected.

When you find an abnormal reading:

1. Verify it—check a second time and confirm the gauge is not stuck or faulty.

2. Notify the watch engineer immediately and state: the system, the parameter, the reading, and the direction of change (rising or falling).

3. Log the finding and your notification with the exact time.

4. Do not attempt corrective action beyond your authorization level unless specifically directed by the watch engineer.

The watch engineer decides whether to acknowledge an alarm, adjust controls, or initiate a shutdown procedure. Your job is accurate, timely reporting.

Key terms8

Engine-room roundA systematic, scheduled inspection of all machinery spaces in which a watchkeeper physically reads and records operating parameters at each station.
QMED (Qualified Member of the Engine Department)A U.S. Coast Guard credential authorizing a mariner to serve in an unlicensed engine-room watchkeeping role; QMED personnel observe and report but do not make engineering officer decisions.
Nautical time24-hour clock format used in all ship logs and records; runs from 0000 to 2359 with no AM/PM designation.
Normal operating rangeThe manufacturer- or company-specified band of values within which a given parameter should fall during routine operation; values outside this range require reporting.
Differential pressureThe difference in pressure measured across a component such as a filter or heat exchanger; a rising differential across a filter indicates increasing blockage.
Lockout/tagout (LOTO)A safety procedure that isolates energy sources (electrical, hydraulic, pneumatic, thermal) before maintenance or inspection, confirmed with the watch engineer before execution.
Oily water separator (OWS)Equipment that removes oil from bilge water before any discharge overboard, required by MARPOL regulations; its operation must be logged.
EscalationThe act of immediately reporting an abnormal condition to the watch engineer with the specific system, parameter, current reading, and direction of change.

Worked examples4

1. The engine-room log requires jacket cooling water outlet temperature to be recorded at 0800. The analog thermometer reads between the 185 and 190 marks on a Fahrenheit scale. The divisions between marks are in 1°F increments. What value do you record, and how do you write the time?
  1. Step 1 – Read at eye level to eliminate parallax. The needle appears to be at the third small division above 185, so the reading is 188°F.
  2. Step 2 – Write the time in 24-hour nautical format: 0800.
  3. Step 3 – Record '188°F' in the jacket cooling water outlet temperature column, initial the entry.
Answer: Log entry: Time 0800 | Jacket CW Outlet Temp: 188°F | Initials.
2. During your 0400 round you check the main engine lube oil pressure gauge. The posted normal range is 45–65 psi. The gauge reads 38 psi. What is the correct sequence of actions?
  1. Step 1 – Verify the reading: observe the gauge a second time and confirm 38 psi; check that the gauge needle is not stuck by tapping lightly on the gauge face if permitted by ship's practice.
  2. Step 2 – Confirm the reading is below the posted minimum of 45 psi—this is an abnormal reading.
  3. Step 3 – Go immediately (or call directly) to the watch engineer. State: 'Main engine lube oil pressure is reading 38 psi at 0400; normal minimum is 45 psi and it appears to be stable/falling.'
  4. Step 4 – Return to the log and record: Time 0400 | ME LO Pressure: 38 psi (abnormal—below minimum) | Watch engineer notified 0401 | Initials.
Answer: Verify the low reading, notify the watch engineer immediately with system/parameter/value/trend, then log both the abnormal value and the time of notification.
3. The engine-room log asks for fuel oil service tank level in percent. The sight glass on the service tank shows a level of 3 feet 6 inches in a tank that is 7 feet tall. What percentage do you record?
  1. Step 1 – Convert the current level and total height to the same unit. Current level = 3.5 ft; total height = 7.0 ft.
  2. Step 2 – Calculate percentage: (3.5 ÷ 7.0) × 100 = 50%.
  3. Step 3 – Record '50%' in the fuel oil service tank level column with the correct time and initials.
Answer: Fuel oil service tank level: 50%.
4. A log entry was made in pencil at 1015 and the wrong temperature (165°F instead of 156°F) was written in ink for the auxiliary engine cooling water outlet. How do you correct it?
  1. Step 1 – Do not erase or use correction fluid. Draw a single horizontal line through '165°F' so the original entry is still readable.
  2. Step 2 – Write the correct value, '156°F', directly beside or above the crossed-out entry.
  3. Step 3 – Add your initials and, if required by ship's practice, a brief note such as 'corr.' next to the correction.
  4. Step 4 – Note: a log entry in pencil is itself an error; notify the watch engineer and re-enter in ink per company SMS requirements.
Answer: Cross out the error with a single line, write the correct value (156°F) next to it, initial the correction, and report that the original entry was made in pencil.

The math in this lesson1

Learners read analog thermometer and pressure gauge divisions to the nearest increment and log them in 24-hour time.
N-Q.3
Brush up in the math halls at newSchoolWorks.com:
In class: Instructor walkthrough of a training engine room or engine-room simulator, identifying all major machinery stations (main engine, auxiliary engines, boilers/economizers, bilge systems, fuel oil service, cooling water, lube oil) and demonstrating how to read each gauge, meter, and indicator while narrating what a normal range looks like versus an alarm condition. · Student teams of two conduct a timed engine-room round using the provided checklist, reading and recording all parameters on a practice log sheet; the instructor has pre-set three instrument readings outside normal range (without telling students which ones) and students must identify and flag them. · Class debrief: each team presents their flagged abnormal readings and states the correct escalation action (notify watch engineer, prepare for alarm acknowledgment, initiate shutdown procedure); instructor provides corrective feedback and clarifies QMED-level responsibilities versus engineer-officer decisions.
Materials: Training engine room or engine-room simulator with functional gauges, engine-room round checklist (instructor-prepared per standard commercial vessel format), practice engine-room log forms, PPE (hearing protection, safety glasses, steel-toed boots), instructor-preset abnormal reading scenario cards
Check: Student records all required parameters on the log form with no more than one omission; identifies all three pre-set abnormal readings; states correct escalation action for each; log entries use correct units and nautical time format. All criteria required to pass.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

STCW Basic Training / USCG QMED watchkeeping duties
1. During an engine-room round, you discover the main engine lube oil pressure is reading below the posted minimum. What is the FIRST action you should take?
USCG QMED engine-room log standards
2. Which of the following correctly represents a time entry in an engine-room log?
USCG QMED / STCW documentation requirements
3. When you make an ink error in the engine-room log, the correct procedure is to:
USCG QMED machinery monitoring
4. A rising differential pressure reading across a lube oil filter most likely indicates:
STCW Basic Training / Maritime safety
5. Before entering the engine room to conduct a round, which combination of PPE is required by standard practice?
STCW Basic Training / MARPOL environmental compliance
6. Bilge water that contains oil must be handled by:
USCG QMED boiler watchkeeping / STCW safety
7. During a round, you notice the sight glass on the boiler shows the water level is not visible—it appears to be below the bottom of the gauge glass. What is the correct action?
USCG QMED main engine monitoring / STCW watchkeeping
8. One cylinder of the main diesel engine shows an exhaust temperature significantly higher than all other cylinders during your round. This reading should be:
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