Propeller Slip: Seafarer Tips and Tricks to Know
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- Category: Enseñanzas náuticas, formación, cursos
- Published on Thursday, 26 February 2026 08:57
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QUICK ANSWER: PROPELLER SLIP AT A GLANCE
What is slip?
• The difference between how far a propeller should move forward per revolution and how far it actually does
• Because water yields and accelerates aft, the propeller never fully converts each turn into forward motion
• There are two types: apparent slip (based on ship speed) and real slip (based on the actual water speed arriving at the propeller)
• At a quay trial with zero ship speed, both slip ratios equal 1.0 — meaning 100% slip
Why it matters:
• Slip is a direct indicator of propeller load — the higher the slip, the higher the load
• Rising slip means the engine works harder for the same speed, burning more fuel
• Uncontrolled
Maritime Labour Convention : 20 years of advancing social dialogue and decent work at sea
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- Published on Thursday, 26 February 2026 07:02
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23 February 2026
Joint statement from the International Labour Organization, the International Chamber of Shipping, and International Transport Workers' Federation on the 20th anniversary of the Maritime Labour Convention
On the 20th anniversary of the Maritime Labour Convention (MLC), 2006, we jointly reaffirm our commitment to the principles and protections it embodies and recognise the profound impact it has had on seafarers and on global shipping.
The MLC consolidated and modernised around 70 maritime labour instruments into a single, comprehensive international framework. In doing so, it established enforceable minimum standards for wages, hours of
Reefer Engineer Essentials: System Operation Tips
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- Published on Saturday, 14 February 2026 07:39
- Written by Administrator2
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marine public
Refrigeration cycles, equipment tricks and troubleshooting tactics
QUICK ANSWER: REEFER REFRIGERATION ESSENTIALS
The Four-Stage Refrigeration Cycle:
• Compression – raises vapor pressure from low to high, enabling heat rejection
• Condensation – converts high-pressure vapor to liquid by removing heat
• Expansion – drops liquid pressure to enable evaporation at low temperature
• Evaporation – absorbs heat from cargo space as liquid becomes vapor
Critical System Components:
► Compressor: Reciprocating (most common) or screw type for vapor compression
► Condenser: Shell-and-tube water-cooled or air-cooled with fans for heat rejection
► Expansion Valve: Thermostatic type maintains 5°C superheat at evaporator outlet
► Evaporator: Tube coil absorbs cargo space heat through refrigerant evaporation
► Receiver: Stores liquid refrigerant between condenser and expansion valve
Superheat and Sub-Cooling Basics:
• Superheat ensures only vapor enters compressor (prevents liquid damage)
• Normal superheat range: 5°C to 10°C at evaporator outlet
• Sub-cooling ensures 100% liquid flow to expansion valve (prevents vapor formation)
• Occurs in condenser and liquid line before expansion
Buque Escuela "Christian Radich"
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- Published on Friday, 13 February 2026 21:57
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Buque escuela de la Marina Cvil de Noruega
History
Christian Radich was built by Framnæs Mech. Yard in 1937. She was built as a sail training ship: the orlops (dormitories) had capacity for berthing 80-90 students (maximum 80 today after renovation), a large galley for learning to cook, carpentry training, and earlier there was also a machine shop on board (where the galley is now) for the training of engineers. The purpose of the training ship was to train sailors. Sailing-ships were the usual vessels around the turn of the century and that is why the sailing ships continued as a school ship later on.
Christian Radich
Even though the initiator to build Christian Radich is often referred to as “Captain”, his profession was general manager