Skip to main content

In Water Survey

Hull survey while ship is afloat done by authorized diving company with surveillance of Class surveyor as the replacement of docking survey

Requirements for IWS
  • Age not greater than 15 years. ( Ships of age 15 years and over may be permitted as special consideration)
  • All ships excluding Enhanced Survey Program (ESP) ships, such as Bulk carrier, Oil Tankers and Dangerous chemical bulk carrie rs of 15 years of age and over.
  • Ship with class “IWS” notation.
  • Need agreement of Flag administration.
  • High quality paint coating for 7.5 years extended dry docking (EDD).
  • Fitted effective anodes, fitted effective current corrosion protection (ECCP).
  • Access arrangements for - sea valves, rudder bearing & pintle clearance.
  • Stern tube wear down measurement, bow & stern thruster  -seal checking  
Documents
  • Survey plan,
  • Location and date of IWS,
  • Detail of hull marks and drawings.
Preparations in dry dock for IWS notation
  • Fitted approved Cathodic protection system.
  • Ship hull is in a satisfactory condition – shot blasted and painted with high quality paint
  • Fitted means for renewal and/or measuring of clearances of
  • Rudder bearings and bushes, stern tube wear down
  • Measures for checking of sea valves and sea chests.
  • Shell openings to be fitted gratings with hinged grid plates.
  • Hull paint color - to assist divers for inspection of hull in next IWS.
  • Mark clearly under-water hull fittings.
  • Mark transverse & longitudinal bulkheads
  • Mark tanks boundaries
  • Mark openings of shell plating for sea valves, docking plugs, thruster unit, stabilizer fins
  • Mark propeller blades with numbers
  • Mark for checking of any relative movements in next IWS
  • Liners on shaft    -bushes of rudder and stern frame
  • Drawings and folders containing above markings
  • Agreed blanking methods of any shell openings

Comments

  1. In the age of high-tech security systems, it’s hard to recognize any other way to protect your home. As soon as the intruder crosses the threshold, they face blaring alarms or warnings that authorities have been notified. These are all excellent defense mechanisms, but can how to get rid of pricker bushes prevent intruders from breaking in in the first place?

    ReplyDelete

Post a Comment

If you have any doubts.Please let me know

Popular posts from this blog

Differences between MC/MC-C and ME/ME-C engines

The electrohydraulic control mechanisms of the ME engine replace the following components of the conventional MC engine: Chain drive for camshaft Camshaft with fuel cams, exhaust cams and indicator cams Fuel pump actuating gear, including roller guides and reversing mechanism Conventional fuel pressure booster and VIT system Exhaust valve actuating gear and roller guides Engine driven starting air distributor Electronic governor with actuator Regulating shaft Engine side control console Mechanical cylinder lubricators. The Engine Control System of the ME engine comprises: Control units Hydraulic power supply unit Hydraulic cylinder units, including: Electronically controlled fuel injection, and Electronically controlled exhaust valve activation Electronically controlled starting air valves Electronically controlled auxiliary blowers Integrated electronic governor functions Tacho system Electronically controlled Alpha lubricators

Shell Expansion Plan

It is a two dimensional drawing of a three dimensional surface of the ship’s hull form. This plan is very useful for the following information:It is used for marking the location of a hull Damage on this plan by identifying the strake number , letter and frame number so that the exact location of the damage and also suggested repairs are marked in a localised copy. The shell expansion can be used for finding areas of painting surfaces such as topside, boot topping and bottom areas by applying Simpsons rules directly.  In the shell expansion the vertical scale used is different from the horizontal scale and a suitable adjustment has to be made when calculating areas. This becomes useful in solving disputes concerning areas of preparation and painting. It gives information on the thickness of the original strake which is indicated by the number in the circle shown in the strake.  The quality of steel used is also shown by letters A,B,D E and AH, BH,DH, EH.

Why is a man hole door elliptical in shape?

Any opening in a pressure vessel is kept to a minimum and for a man entry an elliptical hole  is lesser in size than the corresponding circular hole. More over it is prime concern to have a  smoothed generous radius at the corners to eliminate stress concentration. Hence other  geometrical shapes like rectangle and square are ruled out.  To compensate for the loss of material in the shell due to opening, a doubler ring has to be  provided around the opening. The thickness of the ring depends on the axis length along the  dirrection in which the stresses are maximum and the thickness of the shell. It is important to  align the minor axis along the length of the vessel, as the stress in this direction is  maximum. Longitudinal stress: Pd/2t where P= pressure inside the vessel, d= diameter of the arc, t=  thickness of the shell plating  Circumferential stress: Pd/4t  More over a considerable material and weight saving is achieved as minor is along the  direction of maximum stress.