Hull for Ship New Building dan Repair This requires a Material Take Off (MTO) for all the materials used in the hull construction. The estimators are each allocated their own section of the hull, usually by frame numbers, to produce this MTO and include everything from the main plates, longitudinal main girders, and bulkheads right […]
Estimating Costs and Preparing The Bid for a New Building in Ship I spent some time in the estimating departments of several Offshore Construction Companies, and although my remit was estimating piping fabrication and mechanical equipment installation and commissioning, I also did a little hull fabrication using welded plates. Repairs are estimated on their description […]
Operation of Anchors Using a Capstan or Windlass Anchor chains are connected to a windlass that can either be of vertical or horizontal design. A vertical windlass is known as a capstan, and we shall describe the operation of the anchor and its components using a capstan. The capstan has a drive wheel called a […]
Anchor Classification There are Certification Authorities such as Lloyds, ABS, and DNV who class and certify anchors for use in naval and commercial ships. There are two classifications used; HHP (High Holding Power) and SHHP (Super High Holding Power) and these are noted on the relevant certification. There are also two basic categories : 1. Temporary […]
Fabrication of Anchor Anchors are fabricated from a number of materials; the earliest ones being made from large stone blocks, sacks of sand, wooden logs or from mesh baskets filled with an assortment of stones. Once the industrial revolution came along, blast furnaces produced the pig- iron from which cast iron anchors were made. Following […]
Operation of Anchors Using a Capstan or Windlass Anchor chains are connected to a windlass that can either be of vertical or horizontal design. A vertical windlass is known as a capstan, and we shall describe the operation of the anchor and its components using a capstan. The capstan has a drive wheel called a […]
Oil in The Refrigeration System in Marine Indication oil in the refrigeration system : Temperature is not dropping in the cold rooms as normal, due to fact that oil act as insulation in the evaporator. It may cause excessive frost on the suction line. Refrigerant compressor runs for the extended period of time. Lubricating oil […]
Air in The Refrigeration System Indication air in the refrigeration system : This may cause the refrigeration compressor to overheat, with a high discharge pressure and normal condensing temperature. There are possibilities of small air bubbles in the liquid sight glass of the condenser. Condensing pressure of the refrigerant in the condenser may be high. […]
Moisture in The Refrigeration System This normally comes with the ingress of air in the system. Moisture may freeze at the expansion valve, giving some of the indication of under charging. It will contribute to the corrosion in the system. It may cause lubrication problems and breakdown of the lubricating oil in the refrigerant compressor. […]