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🚒 10 Common Provision Re**er Problems and Their SolutionsA provision re**er must maintain the correct temperature to pre...
26/09/2026

🚒 10 Common Provision Re**er Problems and Their Solutions

A provision re**er must maintain the correct temperature to prevent food spoilage and protect the quality of provisions.

Here are 10 common problems found onboard:

1. 🌑️ Temperature Too High

Cause: Low refrigerant, dirty condenser, or poor airflow.
Solution: Check refrigerant, clean the condenser, and ensure proper airflow.

2. ❄️ Evaporator Icing

Cause: Poor airflow, dirty evaporator, or refrigerant problem.
Solution: Check the fan, clean the evaporator, and check the refrigerant system.

3. πŸ”₯ Compressor Overheating

Cause: High discharge pressure, poor ventilation, or refrigerant problem.
Solution: Check the condenser, ventilation, pressure, and compressor condition.

4. πŸ’§ Water Inside the Re**er

Cause: Blocked drain pipe or drain pan.
Solution: Clean the drain line and check the drain system.

5. ⚑ Compressor Not Starting

Cause: Electrical fault, overload trip, or defective contactor.
Solution: Check the power supply, fuse, overload, and contactor.

6. πŸŒ€ Evaporator Fan Not Running

Cause: Motor failure, electrical fault, or ice blockage.
Solution: Check the motor, wiring, and remove excessive ice.

7. πŸ“ˆ High Discharge Pressure

Cause: Dirty condenser, poor ventilation, or excessive refrigerant.
Solution: Clean the condenser and check the refrigerant charge.

8. πŸ“‰ Low Suction Pressure

Cause: Low refrigerant or restriction in the system.
Solution: Check for leakage and restrictions.

9. πŸ”„ Frequent Compressor ON/OFF

Cause: Thermostat or temperature sensor problem.
Solution: Check the thermostat, sensor, and control settings.

10. 🚨 Temperature Alarm

Cause: Sensor problem, poor door sealing, or blocked airflow.
Solution: Check the sensor, door gasket, loading arrangement, and airflow.

βš“ Important Reminder

Don’t immediately add refrigerant when the temperature is high.

First find the root cause. The problem may be caused by airflow, electrical faults, dirty heat exchangers, door leakage, sensors, or the refrigeration system itself.

Good re**er maintenance = Correct temperature + Good airflow + Clean equipment + Proper refrigerant condition.

🚒 Why Can’t Boiler Water Level Be Too High or Too Low?Boiler water level must be maintained within the correct operating...
25/09/2026

🚒 Why Can’t Boiler Water Level Be Too High or Too Low?

Boiler water level must be maintained within the correct operating range. Both too high and too low water levels can cause serious problems.

πŸ”΄ If Water Level Is TOO LOW

Danger: Boiler Tube Damage

When the water level becomes too low:

* Boiler tubes may become exposed
* Heat transfer surfaces can overheat
* Tubes may deform, crack, or rupture
* In severe cases, it can lead to a boiler explosion

πŸ‘‰ Low water level = insufficient cooling of heating surfaces.

πŸ”΅ If Water Level Is TOO HIGH

Danger: Water Carryover

When the water level is too high:

* Water can enter the steam line
* Steam becomes wet
* Water hammer may occur
* Steam valves and equipment can be damaged
* Priming and foaming may occur
* Water can reach the steam turbine or other steam consumers

πŸ‘‰ High water level = risk of carrying boiler water with the steam.

🟒 Correct Water Level

The objective is to maintain the water level within the manufacturer’s specified normal operating range.

Too Low β†’ Overheating β†’ Tube Damage

Correct Level β†’ Safe Steam Generation

Too High β†’ Water Carryover β†’ Equipment Damage

βš“ Shipboard Reminder

Never ignore a Low Water Level or High Water Level alarm.

Check:
βœ”οΈ Gauge glass
βœ”οΈ Level transmitter
βœ”οΈ Feedwater control valve
βœ”οΈ Feedwater pump
βœ”οΈ Automatic level-control system
βœ”οΈ Boiler water condition

Remember:

A boiler needs the right amount of waterβ€”not too high, not too low.

πŸ”§ Purpose of an Or***ce PlateAn or***ce plate is a metal plate with a precisely sized hole installed inside a pipe.What ...
24/09/2026

πŸ”§ Purpose of an Or***ce Plate

An or***ce plate is a metal plate with a precisely sized hole installed inside a pipe.

What does it do?

➑️ Restricts the flow
➑️ Creates a pressure drop
➑️ Can be used to measure flow rate

How it works:

Fluid β†’ Small Hole β†’ Higher Velocity β†’ Pressure Drop

By measuring the pressure difference before and after the or***ce, we can calculate how much fluid is flowing.

🚒 Common Shipboard Uses

* Fuel oil system
* Cooling water system
* Steam system
* Air system
* Flow measurement

⚠️ Important

The hole size is critical. A wrong or***ce size can result in incorrect flow and pressure.

Simple reminder:

Or***ce Plate = Controlled Restriction + Pressure Drop + Flow Measurement

βš“ Why Do We Calculate Propeller Slip?Have you ever wondered why a vessel’s propeller pitch might say 6.0 meters, but the...
23/09/2026

βš“ Why Do We Calculate Propeller Slip?

Have you ever wondered why a vessel’s propeller pitch might say 6.0 meters, but the ship does not actually move 6.0 meters forward with every revolution?

The reason is Propeller Slip.

πŸ”§ What is Propeller Slip?

Propeller slip is the difference between the theoretical distance the propeller should travel based on its pitch and the actual distance the vessel travels through the water.

πŸ“ Basic Formula

Theoretical Speed:

Speed = Pitch Γ— RPM Γ— 60 Γ· 1852

Slip %:

Slip = (Theoretical Speed βˆ’ Actual Speed) Γ· Theoretical Speed Γ— 100

Example:

Propeller pitch = 6.0 m
Propeller speed = 90 RPM
Ship speed = 14 knots

Theoretical speed:

6.0 Γ— 90 Γ— 60 Γ· 1852
= 17.50 knots

Slip:

(17.50 βˆ’ 14) Γ· 17.50 Γ— 100
= 20% slip

🎯 Why is Propeller Slip Important?

1️⃣ Monitor Propeller Performance

Slip helps engineers determine whether the propeller is effectively converting engine power into ship movement.

2️⃣ Detect Possible Performance Problems

A significant change in slip compared with the vessel’s normal figures may indicate problems such as:

* Fouled hull
* Marine growth
* Damaged or fouled propeller
* Heavy weather
* Incorrect loading condition
* Engine performance problems

3️⃣ Compare Voyage Performance

Propeller slip can be monitored during voyages to identify changes in vessel performance.

4️⃣ Support Fuel-Efficiency Monitoring

Higher-than-normal slip can be associated with increased resistance or reduced propulsive efficiency, which may result in higher fuel consumption for the same speed.

5️⃣ Assist in Troubleshooting

If RPM remains normal but vessel speed decreases, checking propeller slip together with other parameters can help determine whether the problem is related to hull resistance, propeller condition, or engine performance.

⚠️ Important!

A high slip percentage does not automatically mean the propeller is damaged.

Slip is affected by many factors, including:

🌊 Sea condition
🚒 Draft and trim
🧱 Hull fouling
βš“ Loading condition
πŸŒ€ Propeller condition
πŸ’¨ Wind and current
πŸ”§ Engine operating condition

Therefore, propeller slip should be compared with previous voyage data under similar operating conditions.

🧠 Simple Rule

RPM tells you how fast the propeller is turning.

Ship speed tells you how fast the vessel is actually moving.

Propeller slip shows the difference between the two.

πŸ‘‰ Monitoring propeller slip is a simple but useful tool for understanding vessel performance and detecting changes in propulsion efficiency.

βš“ Marine Engineer’s Ideas
Understand the numbers. Understand the ship.

🚒 GOSSIP ONBOARD: A SMALL STORY CAN BECOME A BIG PROBLEM.
22/09/2026

🚒 GOSSIP ONBOARD: A SMALL STORY CAN BECOME A BIG PROBLEM.

πŸ”₯ Why Is Spontaneous Combustion Dangerous?Spontaneous combustion is when a material catches fire without a flame or spar...
22/09/2026

πŸ”₯ Why Is Spontaneous Combustion Dangerous?

Spontaneous combustion is when a material catches fire without a flame or spark.

How does it happen?

Some materials slowly produce heat when they react with oxygen.

If the heat cannot escape, the temperature keeps increasing.

Eventually:

Heat builds up β†’ Temperature rises β†’ πŸ”₯ FIRE

🚒 Common examples onboard

* Oil-soaked rags
* Oily cleaning materials
* Certain cargoes such as coal
* Some chemicals
* Organic materials

⚠️ Why is it dangerous?

The material may look safe because there is no flame at first.

But heat can build up inside until it suddenly catches fire.

🧯 How to prevent it?

βœ… Store oily rags in proper metal containers.
βœ… Keep combustible materials away from heat.
βœ… Maintain good housekeeping.
βœ… Do not allow oily materials to accumulate.
βœ… Monitor cargoes that can self-heat.

πŸ‘¨β€πŸ”§ Remember:

No spark does not mean no fire risk.

πŸ”₯ Prevent heat buildup before it becomes a fire.

🚒 Factors to Be Tested During an Atmosphere TestBefore entering a cargo tank, ballast tank, void space, or other enclose...
22/09/2026

🚒 Factors to Be Tested During an Atmosphere Test

Before entering a cargo tank, ballast tank, void space, or other enclosed space, the atmosphere must be checked to make sure it is safe for personnel entry.

1. 🫁 Oxygen (Oβ‚‚)

Check whether there is enough oxygen to support life.

* Normal air: about 20.9% Oβ‚‚ by volume
* A significant reduction in oxygen can indicate an unsafe atmosphere.
* Oxygen deficiency may be caused by inert gas, corrosion, combustion, or displacement by other gases.

2. πŸ”₯ Flammable Gas / Hydrocarbon

Check the concentration of flammable vapour using the %LEL (Lower Explosive Limit) reading.

* The atmosphere should be within the applicable entry criteria, commonly less than 1% LEL for tank-entry situations.
* Remember: %LEL is not the same as % volume.
* A low LEL reading does not automatically mean the space is safe if oxygen or toxic gases are unsafe.

3. ☠️ Toxic Gases

Depending on the cargo and space, test for gases such as:

* Hβ‚‚S – Hydrogen Sulphide
* CO – Carbon Monoxide
* COβ‚‚ – Carbon Dioxide
* Benzene or other toxic vapours, where applicable

The measured concentration should be below the applicable occupational exposure limit (OEL) and the vessel/company’s enclosed-space entry criteria.

4. πŸ“ Test at Several Locations

Do not test only near the manhole.

Atmospheric conditions can differ at:

Top β†’ Middle β†’ Bottom

Different gases may accumulate at different levels depending on their density and ventilation.

5. πŸ”„ Continuous Monitoring

For higher-risk spaces, atmosphere should be continuously monitored during entry, especially where conditions can change.

βΈ»

βš“ Simple Rule to Remember

Before entering an enclosed space, check:

🫁 Oβ‚‚ – Is there enough oxygen?
πŸ”₯ %LEL – Is there a flammable atmosphere?
☠️ Toxic gases – Are harmful gases within safe limits?
πŸ“ Different levels – Top, middle and bottom
πŸ”„ Continuous monitoring – Can the atmosphere change?

Never rely on a single gas reading at the entrance. Test the atmosphere throughout the space before and during entry.

Safety first: A tank may look empty and clean, but its atmosphere can still be dangerous.

🚒 WHY IS A CARGO TANK DANGEROUS?A cargo tank may look empty, but it can still be dangerous.πŸ”₯ 1. FLAMMABLE GASCargo vapor...
22/09/2026

🚒 WHY IS A CARGO TANK DANGEROUS?

A cargo tank may look empty, but it can still be dangerous.

πŸ”₯ 1. FLAMMABLE GAS

Cargo vapors can remain inside the tank.
A spark can cause a fire or explosion.

☠️ 2. TOXIC VAPORS

Some cargo vapors are poisonous.
You may not see or smell them.

🫁 3. LOW OXYGEN

The tank may have insufficient oxygen.
This can cause dizziness, unconsciousness, and death.

🌑️ 4. HIGH TEMPERATURE

A hot tank can cause heat stress and dehydration.

πŸ’‘ 5. POOR LIGHTING

Dark areas can hide slippery surfaces, obstacles, and tank fittings.

⚠️ REMEMBER

EMPTY DOES NOT MEAN SAFE!

Before entering a cargo tank:

βœ… Ventilate
βœ… Test the atmosphere
βœ… Check oxygen and gases
βœ… Follow the enclosed-space entry permit
βœ… Have a standby person and rescue equipment

STOP. TEST. VENTILATE. THEN ENTER β€” ONLY WHEN SAFE.

🚒 What Does 15 PPM Mean in an OWS?15 ppm is the maximum oil concentration allowed in the effluent discharged overboard f...
21/09/2026

🚒 What Does 15 PPM Mean in an OWS?

15 ppm is the maximum oil concentration allowed in the effluent discharged overboard from an Oil Water Separator (OWS) under the applicable MARPOL requirements.

πŸ”Ή What does 15 ppm mean?

15 ppm = 15 parts of oil per 1,000,000 parts of water.

In simple terms:

πŸ‘‰ 15 ppm = 0.0015% oil concentration

For example, approximately:

15 mL of oil in 1,000 liters of water = 15 ppm

So, the discharge may contain only a very small amount of oil.

πŸ”Ή Why is 15 ppm important?

The OWS is designed to separate oil from oily water before discharge overboard.

If the oil content reaches or exceeds the applicable limit, the 15 ppm Oil Content Monitor/Alarm should prevent or divert the discharge according to the approved system arrangement.

⚠️ Important: The 15 ppm limit applies to the oil content of the discharge, not to the oil concentration inside the OWS tank or separator.

πŸ”Ή Example

If the Oil Content Monitor shows:

🟒 5 ppm β†’ Below the limit
🟒 10 ppm β†’ Below the limit
🟒 14 ppm β†’ Below the limit
πŸ”΄ 15 ppm or above β†’ Alarm/automatic stopping or diverting arrangement should operate as designed.

βš“ Remember

15 PPM is not β€œ15% oil.”

It is only:

15 parts oil per million parts of effluent.

That is why the OWS 15 ppm monitor is a critical pollution-prevention device onboard.

πŸ’¬ Question for Seafarers:
If your OWS shows 12 ppm, would you consider the discharge acceptable? What would you check before opening the overboard valve?

🚒 RightShip Inspection vs SIRE InspectionBoth RightShip and SIRE are used to assess the safety and condition of ships, b...
21/09/2026

🚒 RightShip Inspection vs SIRE Inspection

Both RightShip and SIRE are used to assess the safety and condition of ships, but they have different focuses.

πŸ”΅ RIGHTSHIP

RightShip inspection generally looks at the overall risk, condition, and management of the vessel.

Inspectors may check:

* βš™οΈ Machinery and equipment
* πŸ› οΈ Maintenance
* πŸ“‹ Records and documentation
* πŸ‘¨β€πŸ”§ Crew competence
* 🚨 Safety equipment
* 🌱 Environmental compliance
* βš“ General shipboard operations

Simple question:

πŸ‘‰ β€œIs this vessel safely managed and maintained?”

βΈ»

🟠 SIRE

SIRE is an OCIMF ship inspection programme, mainly associated with oil, chemical, and gas tankers.

It focuses strongly on:

* πŸ›’οΈ Cargo operations
* βš“ Mooring
* πŸ”₯ Fire safety
* 🚨 Emergency procedures
* πŸ§‘β€βœˆοΈ Bridge operations
* βš™οΈ Machinery
* πŸ‘¨β€πŸ”§ Crew knowledge and competence
* πŸ“‹ SMS implementation

Simple question:

πŸ‘‰ β€œIs this tanker being operated safely according to procedures?”

βΈ»

βš”οΈ SIMPLE COMPARISON

RIGHTSHIP
➑️ Overall vessel risk, condition, maintenance and management.

SIRE
➑️ Tanker operations, safety practices, procedures and crew competence.

βΈ»

⚠️ IMPORTANT

Don’t prepare the vessel only for the inspector.

Prepare the vessel for safe operation every day.

Good maintenance + Good records + Good procedures + Competent crew = Inspection readiness.

βš“ A good inspection is the result of good everyday shipboard practices.

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