BASIC THEORIES, SHIP SURVEYLeave a comment

X-BOW/STERN: Beyond the Conventional

Amarine Antonio

One such change which made a splash in the maritime industry was the introduction of X-bow by the Norwegian Ulstein Group. Since the inception of their first ship M/V Bourbon Orca in 2005 several other ship building yards/companies have used their design. The X-bow comprises of a backward sloping bow starting at the extreme front of the vessel. This results in a continuous and smooth bow shape as shown below. Designing such a vessel involves proper weight distribution in the forward region which allows for submission and sharper bow shape. Increased volume up front WITH SLOWLY INCREASE BUOYANCY  FORCE allows … Continue reading X-BOW/STERN: Beyond the Conventional

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HULL TANK STRUCTURE/AIR/HOSE TEST

Amarine Antonio

GENERAL: “Test procedures are to confirm the water-tightness of tanks and watertight boundaries, the structural adequacy of tanks and the weather-tightness of structures/shipboard outfitting.” THERE’RE TWO TYPE OF TEST 1- Structure test  Structural Testing is a test to verify the structural adequacy of the construction of the tank (hydro static test) Structural testing may be carried out after the vessel is launched, some shipyard, they can be done in dry-dock. Visit: Shipbuilding Knowledge A-Z for more free topics on shipbuilding 2-Air leak test Leak Testing is a test to verify the tightness of the boundary (air testing, compressed air fillet weld testing, … Continue reading HULL TANK STRUCTURE/AIR/HOSE TEST

API 570 - PI, PIPING, SHIP SURVEY3 Comments

PIPING HYDRO-STATIC TEST COMPREHENSION

Amarine Antonio

Two types “Shop test and After installation test” First, the hydro-static test of spool at Workshop is prefer to check the quality or strength of Welding joints, integral fittings and confirm whether it can satisfy the rule/standards requirement. TEST PRESSURE (Tp)= 1.5 DESIGN PRESSURE (Dp) “But we can not do final all spools at workshop and just bring on-board for assembly because there’re many Field Joints waiting you ahead. Depend on the flexibility of Rule/Spec, the low pressure pipe’s  field joints can be tested under max.working pressure” Second, in ideal condition, no more welding joints on-board, the Leak test will be … Continue reading PIPING HYDRO-STATIC TEST COMPREHENSION

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2nd-Order Linear Differential Equations (2ndLDE)

Amarine Antonio

2nd-Order Linear Differential Equations – 2ndLDE A differential equation (DE) is an equation involving a function f(x) and its derivatives (x). (Phương trình Vi Phân tuyến tính cấp 2 – Vietnamese. Phương trình) Phương trình vi phân là 1 phương trình chứa biến độc lập x, hàm cần tìm là y = f (x) và các phương trình chứa biến x  như P(x) Q(x) và các cấp đạo hàm của nó.  Let’s forget what you have learned about Math during university 🙂 In Mechanical/Electrical engineering and Rotating equipment, the 2ndLDE is the most application in calculation of vibration, oscillation and circuit. Through this chapter, you … Continue reading 2nd-Order Linear Differential Equations (2ndLDE)

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HULL FRAMING SYSTEM (TRANS/LONGI)

Amarine Antonio

The selection of a structural framing system in any vessel must be made from a consideration of weight (TO BE MINIMIZED) , production matters (TO BE ACCESSIBLE FOR WELDING, NDT) , suitability to resist global loads and vibration. Vessels can principally be either transversely or longitudinally frame (DEPEND ON POSITION OF SHIP). There are three type of Hull framing system: Transverse Framing System Longitudinal Framing System Combined or Mixed Framing System (Hybrids framing system) Advantages: Resist Hydrostatic/local loading ( Bow & Engine room area, Cargo hold of Bulk carrier ) Absorb the vibration (E/R, Accommodation) Disadvantages: Heavier than Longitudinal framing system. Much deformation … Continue reading HULL FRAMING SYSTEM (TRANS/LONGI)