The thordon seathigor seal is a mechanical face seal for 300mm 11. The stern tube seals prevent seawater entry into the vessel at the inboard end of the stern tube bearing. The propeller, located outside the ship, needs to continue reading. As seal get worn the water content will get higher and emulsify the oil. Typical applications include vessels operating in arctic conditions or in environmentally sensitive areas. The seal rings are numbered 4 and 5 in order from the stern tube. This can be accomplished with the wartsila airguard seal with a void space in its design that is constantly managed.
Before any damage was caused to the stern tube bearings and seals, the engine was quickly stopped. Wartsila airguard seal an antipollution and environmentally compliant solution. For detailed use of your ships oil piping system, refer to the operating manual published by. Simplexcompact sc 2000 stern tube seals set the industry standard today. The wartsila enviroguard range is a low maintenance, high performance sealing solution which has an extensive fitte d history spanning many years and numerous different vessel types. Air seal ax compact seal cxdx oil lubricated stern tube bush. Stud type over 1 38 35mm how to order your stern tube assembly 1. The most popular oil lubricated seal is a lip type seal and an example is shown in. Oil refilled during the month to be recorded in the part 6 highest and lowest stern tube temperatures during the month and corresponding sea water temperature.
Engtek is the vietnam agent for kobelco eagle stern tube seal. Seal installation bearing installation on site alignment in situ machining stern tube conversions oil to water. The stern tube is a sensitive part of the ship where the sea water can easily seep inside. Because of their simple construction, the evk series seals have been adopted for many small ships and coastal ships. This document is part of appendix a, and includes the stern tube seals and. A similar procedure us repeated for other bulkheads. The two seal rings face the stern tube towards the oil, providing an active double security against oil spills. The seal is a waterlubricated axial shaft seal system constructed of the highest quality materials which have been engineered to deliver long service life. The drymax stern tube seal system was designed, built and tested by duramax marine in the usa. The sc2 and sc3, also called the simplexcompact 2000, are the latest developments of the oillubricated sterntube seal.
China stern tube seal supplier, we aim to make satisfaction with high quality goods and service. The seal device consists of dynamic components which is installed on the sleeve and static components which is installed on the end face of the stern tube. For reasons of economy, this document is printed in a limited number. Stern tube seal system mide technology corporation. Vessel on a loaded passage in heavy weather suddenly experienced heavy leakage of stern tube lubricating oil from the forward gland into the engine room bilges. Designed and built to the highest standards, the oil. Deep sea seals of stern tube how is water prevented from. Ineffective marine seals can be prone to water ingress that can be damaging to the system as it causes less lubricity and more corrosion. Seafarers technical guide for marine engineers nitrogen generator.
View pdf catalogues and other online documentation prices are pretax. Self lubrication systemkms forced lubrication system kmfkmfn ealbio st100 water lubricated stern tube seal. Like many of mides solutions, the bulkhead seal design utilized. May 18, 2017 the result in one preferred embodiment is a split design stern tube seal for easier installation and maintenance, a stern tube seal which uses corrosionresistant materials, a stern tube seal which uses nonbrittle materials for shock survival, and a rotor and stator design which allows for maximum shaft deflection. Stern tube seals operation of aft seal tank infomarine online. Sterntube seals have to perform two separate functions, one is to ensure that water does not enter the engine room, the second one to allow the propeller shaft to rotate as smoothly and freely as possible. Cedervall aft split oil lubricated sterntube seal type seaqual. Type 4600 waterlubricated stern tube seals are virtually leakfree and are leaving no oil or grease residues in the waterway. For technical specification, see backcover of this leaflet. Marine engineering study materials and resources wrote a new note. This helps ship owners to achieve immediate and significant cost reduction and increased reliability of their stern tube systems. Versite marine, is a anadian leading stern tube sealing manufacturer and service supplier since 2002. Oils in this list were tested for compatibility with the seal material and approved for the application as stern tube lubricant. However, the aft sealing functions better and has a longer life if it is fitted, like the forward sealing, with a lubrication system.
Detail a tube fitting boss seals boss dimensions for military straight thread tube fitting oring gaskets per as5202 supersedes and10049, and10050 and ms33649 parker oring size no. This can be accomplished with the wartsila airguard seal with a void space. Most ships use mineral oil to lubricate the propeller shaft, and the oil is contained in the stern tube by the aft seal which is the oil to sea interface. The two shaft seals containing the oil require frequent maintenance or oil will leak into the sea or into the ship. The aft stern tube seal is a multibarrier lip type seal which contains four seal rings running on a seal liner, to prevent grooving of the shaft. They are primarily designed for use where lip type seals and other circulatory oil feed systems are in operation. According to seal manufacturers, the seal must leak aftinto the sea or forwardinto the ships bilge at the shaft seal interface in order for the seal to function properly. Stern drive unit installation using the alignment tool. The supreme standard is the basic design of the supreme range.
Stern tube sealing arrangements marine propeller shaft guideline. Both the impact resilience of seal lip and the water pressure applied to the back face of rotating seal ring. Water lubricated stern tube seals evk products eagle. A detachable arch is attached to the lower bearing and carries the outboard oil seal. Stern tube bearings support the weight of the propeller shaft where the shaft exits the vessel. A ship needs the propeller to drive it forward in water. The glands are attached at the forward end of the stern tube and prevent the passing of sea water into the ship. The stern tube is situated at the aft peak of the ships hull and the propeller shaft arrangement is also situated at the same level. This design of the driving pin also decrease the pressure on the. The propeller shaft in the after peak tank is provided with inboard and outboard seals.
The pss shaft seal is also recognized as the premiere retrofit aftermarket seal on the world market. The stern tube is filled with oil, grease or water and forms a barrier between the. Antipollution sealing at its best to fully achieve genuine antipollution stern tube sealing the seawater and the stern tube oil needs to be separated by an air barrier. The carboplanplus is a stateoftheart stern tube seal that is trusted by navies around the world. General the seal is an aft oil lubricated face seal for propeller shafts. This compact water lubricated seal has superb vibration resistance and high sealing performance. In principle, the sterntube aft seals can function without a lubrication system.
The same construction is used on fwd seals of type cx, dx or ax. It possesses various characteristics that make it advantageous for use. In case where the use of eal is s technically infeasible, a sof will be issued after confirming that documentation issued by the manufacturer of the product in question that using an eal with their. Different types of stern tube seals mide technology. Carboplanplus submarine seals are the result of extensive research, and it is a completely new kind of stern tube seal. The seal is able to accommodate large axial and radial. Simplexturbulos team of highly skilled engineers is dedicated to the sterntube seal service and. The basic function is to prevent oil leakage from and seawater penetration into the stern tube. Consisting of bronze housing parts or cast iron to fit inland vessels, and also available in a split version, the aft seal prevents water ingress and oil leakage to the outside environment. The general working principle of labyrinth seals is to create a series of barriers that gradually reduce pressure such that the final seal is not subject to a large volume of sealing media at these higher pressures.
This peculiar shaped ring is held in close contact with the shaft and the stern tube to prevent oil leakage or water entry. The sureseal identifier is used to find the sureseal part number the is right for your boat. Figure 1616 cg 47 stern tube seal configuration figure 1617 cg 47 stern tube seal with dummy seat installed figure 1618 navsea drawing 66998079 contour template fixture. The stem tube is located where the shaft passes through the hull of the ship.
Stern tube seal oil samples to be taken regularly from the sampling cock to determine water content. Pdf advanced technology of propeller shaft stern tube. The stern tube is a hollow tubelike structure at the stern or rear part of the ship. And because they prevent getting water into the bilge, no elaborate actions are required for its disposal. Simplex rudder stock seals exclusively seal oscillating rudder stock shafts against oil or water. Applying a shut down seal eliminates costly and timeconsuming drydocking. Stern tube seal oil leakage from a ship is considered normal operational consumption and typically an acceptable practice. Follow ship builders recommendation for oil viscosity if it is specified for st bearing lubrication. Without it, as soon as the ship was launched, water would travel up the stern tube or through the transom directly into the ship and it would sink. A housing with series of seal rings clamped into position on the bush. Water lubricated bearing steel stern tube this type of stern tube.
I did pump some grease into the tube and the drip slowed considerably. This document is part of appendix a, and includes the stern tube seals and underwater bearing lubrication. Caution forcing the alignment tool into position may damage the gimbal bearing or engine coupler. The stern glands thus seal the area between the stern tube and the propeller shaft. Advanced technology of propeller shaft stern tube seal. Lip seals are seals made of special kind of materials elastic, having a projecting lip or edge. Cedervall aft split oil lubricated sterntube seal type. They exclude delivery charges and customs duties and do not. Stern tube seals kobelco marine stern tube seal installation this document, and more, is available for download from martins marine engineering page.
The stern tube is a hollow tube which accommodates the bearings, the seal boxes and the propeller shaft. These seals contain nitrile rubber or viton lip seal which seals against the bronze liner shrunk fit around the cast iron propeller shaft. For over 70 years, simplex sterntube seals have offered the marine industry a solution. Maintenance is very easy thanks to the facetype design. Hayling graphics animation showing the assembly process for the warstila enviroguard water lubricated stern tube seal. Stern tube seals and propulsion service rm propulsion b.
Add an oil leakage into the mix and you could face considerable maintenance costs and unplanned downtime. Home marine shaft components sterntube seal service and repair. Independent from the makers, we offer a complete and tailormade maintenance concept for oil lubricated stern tube seals. Wartsila enviroguard, water lubricated sterntube seals. Maintenance and repairs can be performed with vessel afloat. Stern tube bearings and sea water temperatures to be recorded in engine logbook and in the part 5. A sdvosb service disabled veteran owned small business.
Epoxy glass tube with cutless bearing outboard, flexible inboard bearing and nut type traditional gland or pss seal or tides marine seal. Our seals are designed for oillubricated propeller shaft bearings and must achieve two important things. Wartsila enviroguard seals are pollution free forward water lubricated sterntube seals suitable for any commercial or military application. Maritimeexpert website maritime experts information. Revision 0, 1 february 1996 revision 0, change h, 15 november 2011. Unique design of seal ensures no wear of the shaft sleeve. The shape, size and number of lip seals depends on the size and type of application.
Measuring propeller drop with the help of poker gauge. There are various kinds of seal systems used, such as lip type or mechanical type for oil lubricated stern tubes. The forward end of the stern tube is supported by the aft peak bulk head and the aft end of the stern tube gets its support from the stern frame of the ship. Stern tube lubrication systems oillubricated stern tubes. If outboard seal leaks, the following steps are to be taken. Stern tube seal for sale, china stern tube seals supplier. My question is, has anyone seen this configuration before and if so, do you have maintenance recommendations. In most cases, you cannot simply replace the mineral oil with seawater or other oilbased.
Stern tube bearings, generally oil lubrication glands, are used to prevent the ingress of sea water inside the engine room and also to support the weight of the propeller. The other two seal rings face towards the seawater to effectively seal against seawater. Stern tube oil kluberbio rm 2100 kluberbio rm 2150 iso vg 100 biodegradability 60 % european ecolabel eal controllable pitch propeller fixed pitch propeller stern tube bearing and propeller shaft seal gear oil kluberbio eg 268 kluberbio eg 2100 kluberbio eg 2150 kluberbio eg 2320. Our solution will help protect the marine environment and provide a positive payback achieved through. It is the latest version of submarines seals by carboplan, mechanical seal, which is a leading seal used on submarines.
Depending on the vessel type, lubrication for the stern tube seals, stern tube, and strut bearings is accomplished by seawater, freshwater, or oil. The drymax shaft seal is a reliable system that uses no. Lubricant list for sterntube seals seal material and approved for the application as stern tube lubricant. A spring loaded white metal ring aligned with spherical driving pins to allow fluctuations in the shaft line. Phase i final rule and technical development document of. The shaft is supported within the stern tube by two stern tube bearings.
A declaration from the stern tube seal maker stating their seal is compatible with the used an eal. Simplexturbulo spares for medium speed diesel engines. A stern tube with bearings radially supports the propeller shaft from the main engine. The wartsila iceguard face type seals are suitable for stern tubes operating in vessels with enclosed water lubricated stern tube systems.
Product description gulfsea bd sterntube oils are a range of environmentally sensitive lubricants, formulated from natural and renewable esters, which provide excellent lubrication in both neat and emulsion forms. But this is not it, the whole stern tube arrangement is packed and sealed from both the sides for additional protection of the stern tube. System allows stern tube to be drawn into the vessel for inspection the bottom half bearing is supported on chocks which in turn rest on two fore and aft machined surfaces within stern tube boss. Following the uss cole bombing, the us navy entrusted mide technology to development an innovative and effective solution for the navys failing bulkhead shaft seals on arleigh burke class destroyers ddg, the result of which was mides reliant and omni products. Lube oil stern tube seal platform supply vessels asma7026uk work ships stern tubes 16. Description of seal assembly figure 1 the seal comprises the following principal components, refer to figure 1.
Stern tube sealing arrangements marine propeller shaft. To fully achieve genuine antipollution stern tube sealing the seawater and the stern tube oil needs to be separated by an air barrier. All the stern tube seal rings are manufactured with a specially formulated material to ensure compatibility with all. Arguably one of the most critical shipboard systems is the seal which keeps sea water out, and allows the propulsion shaft to continue spinning, the stern tube seal. Ive attached a series of pictures in a pdf document to perhaps explain better what the. In a face seal the sealing is achieved by combining two lapped rings, stator and rotor. To prevent oil from penetrating between the sealing faces pressure is added using pressure springs. Type 4604 waterlubricated stern tube seals are virtually leakfree and are leaving no oil or grease residues in the waterway. Nature of discharge for the phase i final rule and technical development document of uniform national discharge standards unds, published in april 1999. Looking for a reliable stern tube sealing solution. Intermediate and main strut bearings are outboard bearings that support the weight of the propeller and shafting outboard of the vessel. Sep 29, 2011 part way down the stern tube is a fitting that feeds grease into the tube. Thanks to an intelligent module design we are able to deliver customized stern tubes for vessels of all types and sizes.
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