The Draft, as simple definition is the distance between the sea level and the bottom of hull (included the thickness of bottom – see this topic) Meanwhile, at the initial design stage, there are two terms of Scantling & Design … Continue reading Design draft vs Scantling draft ( full words )

This topic is an additional knowledge support for SHIP STRENGTH CALCULATION (Part 1) and SHIP STRENGTH CALCULATION (Part 2). Under sea-going condition, the Hogging and Sagging condition make the ship steel be continuously compressed and stretched those making steel become fatigue collapsed specially … Continue reading Shear Strake Plate of Ship (full words)

Load line certificate certifies that vessel complies with the Loadline Convention.  International Convention on LoadLine: Adopted: 5th of April 1966 Entry into force: 21st July 1968 Main objectives: to ensure weather-tight and watertight integrity of ships To specify maximum safe draft the ship can sail on by assigning minimum freeboards Loadline convention applies to ships of more than 24 meters in length. Not all ships of more than 24 meters in length need to comply with loadline convention. There are some exemptions to it which are detailed in article 6 of the loadline convention. Article 6 – Exemptions (1). Ships, … Continue reading Load Line Certificate of Ship

This guidance is applied to the surface defects and the standards of measures to take when defects are found in the carbon steel castings of hull structures such as the stern frame and the rudder frame. Purpose Although there are rule requirements for the defects and repairing methods of cast steel structures, they are no more than conceptual explanations so when defects are discovered, problems regarding the standard and repairing methods arise. Therefore, this purposes to define the standards and the repairing methods of surface defects to solve the issue and to prevent delay of the process. Types of Surface … Continue reading Casting steel & Repair standards

The following guidelines apply for testing procedures and overall maintenance of bottom plug/socket installation tasks for all ships constructed in the shipyard or during drying dock examination. Purpose The purpose of this section is to not only prevent malfunction as well as to inspect each item in the B/plug close test performed before dock water filling by establishing testing standards for each stage of hull and ship construction procedure as well as for warehousing of bottom plug/sockets, thereby enabling enhanced productivity and the settlement of an independent quality guaranteeing system. Test Timing and Checking Procedure 1-Warehousing test When warehousing parts, sampling … Continue reading Ship Bottom Plug Inspection

These guidelines define the onboard test for the Lifeboat Davit Freefall Type PURPOSE This article aims at confirming the satisfaction required by the Ship Owner/Ship Classification through the onboard test for the lifeboat. FREE-FALL TYPE LIFEBOAT TEST METHOD 1- Use a recovery davit under a weight of W1 for the lifeboat lowering test to test the lowering and brake * W1 WEIGHT = 1.1 × (WEIGHT WITH EQUIPMENT + 3 PERSON WEIGHT) 2- Use a recovery davit at the weight of W1 for the lifeboat recovery test to test the hoisting and brake   3- Use the recover davit at the … Continue reading Lifeboat Davit Test & Inspection on Ship (Part 2)

These guidelines define the onboard test for the Lifeboat Davit Gravity Type PURPOSE This article aims at confirming the satisfaction required by the Ship Owner/Ship Classification through the onboard test for the lifeboat. GRAVITY TYPE LIFEBOAT TEST METHOD 1- Preparation 20˚ heeling test Prepare 20˚ heeling test using a chain block before the inspection. 2- 20˚HEELING TEST Check any touch to the shell plate while lowering the boat in 20˚ heeling condition. 3- LOWERING TEST Check the lower speed while lowering the boat after loading the following weight. (Measure time with a stopwatch using a 10m rope) *  LIFEBOAT: WEIGHT … Continue reading Lifeboat Davit Test & Inspection on Ship (Part 1)