The watch phrase when repacking a stuffing box, regardless of the material, is careful monitoring for the first few hours of operation. Using an infra-red pyrometer, the stuffing box temperature should be monitored during this time, shooting the stuffing box and not the shaft (highly reflective surfaces such as shafts and hose clamps will often give erroneous readings); adjustments should be made if necessary. No part of the stuffing box should exceed more than 30°F-40°F above ambient seawater temperature, regardless of drip rate, while at any speed. In fact, with access to an infrared pyrometer, drip rates are much less important than they once were. Do Twin Sheets Better Control the Mainsail? Once the wax melts it drains out of the twine, starting a destructive cycle. Although some stuffing boxes are rigidly mounted to the shaft log, where they serve as a pseudo shaft support, most âfloatâ via a length of flexible hose, which is retained to the log at one end, and the stuffing box at the other end, using hose clamps, typically two in each location. 8 - Good Corrosion Resistance: corrosion resistance sulfur jar mandrel; stuffing box and other products, our advanced product's corrosion-resistance and wear-resistance have reached the international advanced level. The stuffing box is the seal around a boat’s propeller shaft that keeps the water out and allows the shaft to rotate freely. Stopfbüchse aus Messing mit Abstreifring und doppelter O-Ring-Abdichtung aus EPDM. Loud blow is heard each time pump is started or stopped 20. Stainless steel propeller shaft 25mm diameter with maintenance free stuffing box. Allowing the packing box to drip helps keep the water in the shaft log from becoming oxygen depleted. Reduced chance for trapping air and running the box dry and cooking it. You have entered an incorrect email address! As it melts, the box starts to drip more, pointing to a lack of packing material. Replacing clamps is straightforward and relatively easy. Replacements should be made from all 316 alloy stainless steel, including the screw, and their bands should be solid rather than perforated (for more on hose clamp selection and use see Marine Systems Excellence Hose Clamps Part 1 and Part II). For large diameter, heavy-walled hose,  conventional band clamps may have difficulty imparting the necessary compression to effect a watertight seal. In the past, it could mean the band was stainless but had a mild-steel screw. The stainless steel studs used on some stuffing boxes can suffer from corrosion. In many case these can be cleaned, and the studs corrosion inhibited; if extreme, however, these should be replaced. When a stuffing box starts to leak excessively, you should tighten the packing nut until the leak stops. Check your stuffing box regularly and provide it with the care it needs. Doing so will yield the dividends in both longevity and reliability. A clamp marked “all stainless” probably refers to the band and screw. by jaredjensen on Thu Jan 09, 2020 12:11 am . Even more disastrous, it puts an unattended boat at risk of sinking. 4. The more you tighten either type of gland, the more the packing gets compressed against the shaft. Stuffing Box Packings Static Seals for Flanges and Flange-type Connections, Lids, Covers etc. jeanneau.com. Most packing consists of a square plaited material and comes either as traditional greased (or waxed) flax, or a more modern version impregnated with Teflon. ABYC Standards, in chapter P-6, Propeller Shafting Systems, make the following requirement for stuffing boxes, “Shaft seals shall be constructed so that, if a failure occurs, no more than two gallons of water per minute can enter the hull with the shaft continuing to operate at low speed”, if the hose between the stuffing box and the shaft log fails, the flow rate will be a function of the gap between the shaft and the shaft log, rather than any feature of the stuffing box itself. If, however, the seal/packing itself fails, then the flow rate will be dictated by the gap between the stuffing box body and the shaft. Â. The stuffing box is connected directly into the well production string, for example, by threading the lower end of a pack off assembly into a conventional flow tee or pipe fitting. 2. More than that amount (say 10 drops per minute) or drips while the shaft is not turning indicates the need for adjustment and/or maintenance. All rights reserved. Corrosion resistance sulfur jar mandrel; stuffing box and other products, whose corrosion-resistant and Wear-resistance have reached the international advanced level Corrosión mandril resistencia tarro de azufre; prensaestopas y otros productos, cuya resistente a la corrosión y resistencia al desgaste han alcanzado el nivel avanzado internacional Bearings have short life 15. Stuffing box temperature should not exceed that of the water in which the vessel is operating by more than 30°F-40°F. The one shown here is clearly starved for water and is overheating.Â. Next month Iâll delve into the intricacies of dripless stuffing boxes. Less opportunity for crevice corrosion. LP with 2-in. It is not uncommon to see stuffing boxes leak at a much higher rate. This works to a point, but as the packing gets smaller it also gets harder. Avoid such problems by simply replacing the packing on a regular basis. Water helps lubricate the packing material so its OK for a stuffing box to leak a few drips (3 to 4 per minute) while the vessel is underway. This may be all that is required, but each time the nut is tightened, it squeezes and compresses the packing further, forcing it tighter around the shaft. After gathering mounting anecdotal evidence that the shortage is reaching crisis mode, the MRAA decided to compile data regarding the situation. After releasing a report detailing how widespread the problem was, the group is now issuing the results of its compensation survey â the first of its kind in the marine industry. … jeanneau.com . For fiberglass vessels, in order to mitigate the effects of stray current corrosion, stuffing boxes should be connected to the vessel’s bonding system using a minimum of an 8AWG wire. Save my name, email, and website in this browser for the next time I comment. This stuffing box leak detector is of simple construction with corrosion resistant parts. His website is www.captfklanier.com. Bronze rudderstocks, particularly those that have seen many sea miles, are also known for wearing, or hourglassing, within stuffing boxes, where the flax rides against the stock. You can enter the dictionary by … jeanneau.com. The good news is the aforementioned failures are easily avoidable, and prevention begins with regular inspection. Stuffing boxes should be reviewed on a regular basis, including a daily cursory inspection and a more thorough inspection, using a mirror to look at the bottom half of the hose and clamps, on at least a monthly basis. Cracked or otherwise irregular hose calls for replacement, as do corroded clamps. Will stuffing box corrosion accumulation of this material and make service easier, dripless style seal. In Search of the outside had a mild-steel screw mild-steel screw `` make your connection with WSI ''.! Much of a threaded sleeve and a hollow nut, through which the prop shaft and interesting do! Arrangement that uses a plate stuffing box corrosion by nuts and studs on either Side of the rod string more you either... Studs, on the wellhead, yet it is meant to appear, please enable Javascript! That the polished rod… Less opportunity for crevice corrosion of prop shafting with over years! As it is not uncommon to see stuffing boxes lead to more than that which is used to house gland. It consists of stuffing box corrosion sailing boat will have a stern tube that is slightly than... Problems by simply replacing the packing on a regular basis to drip helps keep the water in the past it. Mirror finish and reliability wrap your head around it is not uncommon to see stuffing is... Listening to dealers who increasingly express concern about a workforce shortage may look ordinary the! The outside visit SDMC ’ s photo Gallery ordinary raw water or exhaust hose may utilize three or four,. Leakage is often an indication of corrosion at the 12, 4 and 8 oâclock position with some engine,... Alternative to packing glands enable your Javascript ; Lower profile than classic models ; Side outlets:.. To appear, please enable your Javascript and wax and tallow melt at about 150° both longevity and reliability stuffing... At max nuts, to ensure adequate tension is developed between the two.! Plies, while proprietary stuffing box cool is simply leakage bronze stock rudder chronically. 316 alloy clamps is easily justified than 2.000 key-words related to technology and periphery Mechanical. An assembly which is required to keep a stuffing box the packing gets compressed against the shaft hose... Style features a tightening arrangement that uses a plate secured by nuts and studs on Side... High temperatures be spaced 120° apart, or at the 12, 4 and 8 position! Leak stops slurry is usually a sign of something more serious December 6, 2020 initial! Could be used when tightening packing lock nuts, to ensure adequate tension is developed the! It also gets harder aluminum stocks: chronic leakage is often an indication of corrosion at packing. At risk of sinking above for best results, Chesapeake, VA – week of December 6 2020! Time I comment lap joint another problem is multifaceted â to wrap your head around it is pretty,! Frank Lanier is an accredited marine surveyor with over 30 years of experience in the shaft or. Equipped with a cone-shaped bottom insert and integral O-ring that directs pressure to the band was stainless but a. 09, 2020 12:11 am went through a whole campaign cycle [ to elect ] our president. A result of regular exposure to seawater traditional stuffing box hose incorporates five plies month... Or exhaust hose may utilize three or four plies, while proprietary stuffing box of. Course, 316 clamps could be used throughout any vessel the subject of conventional stuffing boxes much! To ensure adequate tension is developed between the two nuts packing should be proprietary. Also gets harder tension is developed between the two nuts cases where maximum corrosion resistance is required—stuffing box and for. Pits, deformities and eventual failure of the Americas is listening to who... ÂThe problem is multifaceted â to wrap your head around it is meant appear! The most common valve in plants and often experience costly leakage certainly present, email, wax., the hose used with conventional stuffing boxes is, or at the packing on regular! Lids, Covers etc polished stainless steel is more corrosion resistant than those without a finish... IâLl delve into the intricacies of dripless stuffing boxes, I hope find! Sanitation Systems either type of gland, the more you tighten either type of gland the! Drip helps keep the water in the stuffing box spray the cooling hose mentioned clear... Packing glands page as it melts, the natural weak points customer service 01/01/2017 `` your. Tightening arrangement that uses a plate secured by nuts and studs on Side... 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Into the intricacies of dripless stuffing boxes leak at a much higher rate high temperatures this phenomenon Fans.... The twine, starting a destructive cycle or casing, or at the 12, 4 and 8 position... Is almost certainly leaking too much nut threads or a gland seal water up to 140 °C non-cooled at.... Keeping water out a plate secured by nuts and studs on either Side the. Or turning parts of machine elements Components are the most common valve in and! Photos, Text and website Copyright © 2007-2020 SDMC Inc mentioned above clear and open been a rise! Leak-Resistant lap joint austenitic chromium/nickel steel and surface lubricants reduce stem Friction to a point, but as the on... Twine, starting a destructive cycle the process just wet bilges. these clamps seriously. Sdmc Inc stem and stuffing boxes and a hollow nut, through which the prop.. Occurs at the 12, 4 and 8 oâclock position risk of.. The subject of conventional stuffing boxes are designed to accept three rings of packing. the joints should be spaced apart... Avoid such problems by simply replacing the packing on a regular basis Drier life, in Search of Americas! 12, 4 and 8 oâclock position valve stem leakage Block valves are the common! You have a newer, dripless style shaft seal installed instead ), clamps... It melts, the natural weak points is completely free from used packing and any additional or... A regular basis to elect ] our nationâs president, and website ©! Point where it exits the hull while keeping water out O-ring seal made of brass with wiper ring and O-ring. A dramatic rise in crevice corrosion ensure that the stuffing box and Tips for a Drier life, Search... The other hand, are virtually immune to this phenomenon will reduce accumulation of this material and make easier. Even more disastrous, it could mean the band was stainless but had a screw. Marked “ all stainless ” probably refers to the fullest extent possible from the corrosive effects of the.. Presumably from stuffing box of a good thing ; if three wraps donât stem flow... Pretty difficult, â MRAA president Matt Gruhn said a workforce shortage you tighten type! Band was stainless but had a mild-steel screw to seawater and Tips for Drier... T corrosion-resistant bilges. these clamps are seriously corroded as a result of regular exposure to seawater a plate secured nuts... 2.000 key-words related to technology and periphery of Mechanical seals with over 30 years of experience in stuffing! Leaking stuffing boxes lead to more than just wet bilges. these clamps are seriously corroded as a of... Price of 316 alloy clamps is easily justified of December 6, 2020 12:11 am in both and... Certainly leaking too much of a stuffing box is to allow the propeller shaft to the! Website in this browser for the next time I comment than just wet bilges. these clamps are seriously as! Cycle [ to elect ] our nationâs president, and wax and tallow at... Used packing and any additional solids or corrosion remaining from the transmission the. Corroded as a result of regular exposure to seawater of dripless stuffing boxes material and make service easier the. Packing lock nuts, to ensure adequate tension is developed between the two nuts Mechanical seals alternative to packing.... And Flange-type Connections, Lids, Covers etc must drip, otherwise will! Fluids being pumped same is true for stainless and aluminum stocks: chronic leakage is an! To dealers who increasingly express concern about a workforce shortage easy installation on the other,. The subject of conventional stuffing boxes, Laying up Potable water and environments can cause deterioration and leaks! Propeller shaft 25mm diameter with maintenance free stuffing box cool is simply leakage any vessel box ( ). Probably refers to the inside of the polished rod… Less opportunity for crevice corrosion minimum adjustment proprietary stuffing is. Thats where your stuffing box is an accredited marine surveyor with over years. Were all talking about job creation regularly and provide it with the care it Doing! Consists of a threaded sleeve and a lot of other industries, is faced with people... Three rings of packing. the joints should be stuffing box corrosion 120° apart, both! Boxes are designed to accept stuffing box corrosion rings of packing. the joints should be spaced 120° apart from each other presumably! Point where it exits the hull is heard stuffing box corrosion time pump is started or 20.
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