What propels a ship forward and allows it to boldly navigate through beam seas and calm waters?
The answer is a ship’s thrust, which is generated in the propeller. This device is attached to the crankshaft and emanates from the main engine. Between the main engine and the propeller runs a critically important piece of equipment called the stern tube.
Without a stern tube, generating thrust is not possible. The bearing arrangement and sealing of the stern tube can make a big difference in a ship’s ability to control the propeller and keep water from leaking into the ship.
Size, temperature, application, media and pressure — all of these factors play a role in selecting the right fitting material for the job. Since choosing the correct fitting for your system can get complicated at times, technical experts in the field created an acronym to help users during the process. All you need to remember is STAMP (size, temperature, application, media and pressure).
Size – The outside diameter and wall thickness for tube fittings is the best place to start. The fitting has to fit after all. Tube-end types come with thickness limitations in most cases. Flare fittings usually have …
The United States Coast Guard recently announced that it will conduct surprise examinations of cruise ships through the remainder of 2014 in an effort to increase oversight of sea vessels.
The recent spate of incidents involving cruise ships is a driving force behind this new policy, which has become increasingly more important considering the large amount of passengers aboard cruise ships and the distances they travel away from response assets. Some ships can carry as many as 6,000 passengers and 2,000 crew members. In all, the National Transportation Safety Board (NTSB) estimates that more than 22 million people took a cruise in …