Marine Engineering and Naval Architecture

A heavy chain used for holding a vessel at anchor. The total length of chain is to be divided in approximately equal parts between the two bower anchors. The inboard ends of the chain cables are to be secured to the ship’s structure by means which enable, in case of emergency, an easy slipping of the chain cables to sea. Ship Anchor chain and chain accessories are to be produced by manufacturers approved by classification society. All chain is to have a workmanlike finish and be free from injurious defects. There is to be an odd number of links in each shot of anchor chain cable to insure shackles leading over the windlass are in the same position. The steel used for the manufacture of chain is to be made by the open-hearth, basic-oxygen, electric-furnace or such other process as may be specially approved. Rimmed steel is not acceptable for any grade of chain. For approval purposes, the manufacturer is to submit a manufacturing procedure specification, applicable material g...

All anchors are to be manufactured from materials meeting the requirements of the classification society rules for Materials and Welding and produced by a manufacturer approved by classification society rules. Cast steel anchor flukes, shanks, swivels and shackles are to be manufactured and tested in accordance with the requirements of  classification society rules  and comply with the requirements for castings for welded construction. The steel is to be fine grain treated with aluminum. Cast steel anchor flukes and shanks are to have integrally cast test coupons. The test coupons are not to be detached until the full heat treatment cycle has been completed. The method of detachment is not to physically or metallurgically damage the anchor component. Test coupons are not to be detached until they have been stamped by the Surveyor for identification. Test coupons are to be traceable to the cast components they represent. Test reports are to be traceable to the test coup...

When anchors have satisfactorily passed the test requirements, they are to be clearly stamped by the manufacturer. One side of the anchor is to be reserved solely for the above marks and the other side used for the maker’s name or other trademarks that may be desired. If the design of the anchor does not permit the above marks being placed or grouped as indicated, a suitable boss is to be cast on each arm on which the marks are to be stamped. The Maltese Cross, À is to be stamped at positions “B” & “J” along with the witnessing Surveyor’s initials per Figure. A          The number of Certificate. (Furnished by the Surveyor)           00-PA123  B         (2005) The Maltese Cross Stamp and the Initials of the              Surveyor who witnesses the Proof Test                          ...

1. Product Test Programs There are two test programs, which apply to ship anchor manufacture for testing.  Program A, or  Program B. 2. Drop Test Each ship anchor fluke and shank is to be individually raised to a height of 4 m (13.1 ft) and dropped on to a steel slab without fracturing. The steel slab is to be suitable to resist the impact of the dropped component. 3. Hammering Test After the drop test, hammering tests are to be carried out on each ship anchor fluke and the shank, which is slung clear of the ground, using a non-metallic sling, and hammered to check the soundness of the component. The hammer of at least 3 kg (6.6 lbs) mass is to be used. 4. Visual Inspection After proof loading visual inspection of all accessible surfaces is to be carried out. 5. General Nondestructive Examination After proof loading, general NDE is to be carried out as indicated in Table 3 and Table 4. 6. Extended Nondestructive Examina...

Before application of proof test load, the anchors are to be visually examined, and all defects are to be removed, and if necessary repaired by welding, prior to testing. Proof tests are to be carried out on all anchors after being temporarily assembled. The proof tests are to be in accordance with the values given in Table. The proof load in accordance with Table is to be applied on the fluke at a location one third of the distance from the tip of the fluke to the center of the crown as shown in Figure. In the case of stockless anchors, both arms are to be tested at the same time, first on one side of the shank, then reversed and tested on the other. After proof load testing the anchors are to be examined for cracks and other defects, and for excessive deformation due to seating. Upon completion of the proof load tests, anchors made in more than one piece are to be examined for free rotation of their heads over the complete angle. The anchor shackle that underwent proof load t...

After having found the equipment numeral from previous blog , the details regarding sizes and quality  may be obtained from the rigging tables provided in these regulations. From these table , we can find the following information The Equipment Letter Stockless bower anchors number of anchor Mass per anchor (kg) Stud-link chain cables for bower anchors Total length (m) Grade and Diameter (mm) of chain CC1———— low  strength. CC2———–medium strength. CC3———–high strength Towline Minimum length (m) Minimum breaking strength (KN) Mooring Lines Number Length of each mooring ropes (m) Minimum breaking strength (KN)