stuffing box material

Javascript is disabled on your browser. I get it that the traditional stuffing box would be easier to service when out of your home waters, but blue water cruisers have 99% accepted roller furling jibs. More How To. Latest. Just as important as the rudder travel is how its movement is checked. Stuffing boxes are ubiquitous. The stuffing box nut seems to be absorbing a lot of the heat build up while the shaft is staying under a 20 degree delta from sitting still. This destroyed foam-core and stainless-steel rudder reveals the conventional construction of such appendages. Dramatically reduces stuffing box failures and maintenance costs; Rubber packing … A gland nut or packing nut threads onto the stern tube. More information about cookies and your choice can be found in our Privacy Policy. The webbing in the form of a plate or grid should be welded to the stock with ample horizontal gussets (small wedges welded where the stock and webbing interface), which will reinforce welds 90° to the primary web attachment. Walking around a boatyard one day and measuring a few cruising sailboat rudders, I came up with aspect ratios of between 1.7 and 2.1, while one high-performance sailing vessel’s rudder came in at 3.5. Maintain this gland around the prop shaft to keep leaks at bay. **Add 11 lb if equipped with optional HPLUG. To view this … This is usually accomplished by a component known as a rudder log, or port. Like other systems and gear aboard cruising and commercial vessels, rudders have terms to identify their parts and functions. A stuffing box is sometimes likened to the packing nut on a common faucet, where the gland is usually packed with string soaked in tallow or similar grease. Green sand composition is… 70-85% silica sand (SiO2) 10-12% bonding material e.g., clay etc. Well-engineered rudder bearings support and lubricate the rudderstock. The bearing may be as simple as a bronze or nonmetallic bushing or tube inside of which the stock turns; or it may be as complex as a self-aligning roller-bearing carrier that absorbs rudder deflection and prevents binding. When water, steam, and other … The webbing, or internal metallic support system, in most composite rudders must be strong enough to carry the loads of service and be made of the appropriate material. Insidiously, corrosion nearly always occurs in places where it cannot easily be seen—such as inside many composite (fiberglass and core material) rudder blades and beneath flax-type stuffing-box packing (the problem is exacerbated when the vessel is used infrequently). Description: The stuffing box is a simple seal for WITTE gear pumps. Bronze, a once popular rudderstock material, is no longer common in today’s … To accept cookies from this site, please click the ‘I Accept’ button below. Thus, rudders on high-performance sailing vessels are said to have a high-aspect ratio. December 4, 2008. Of these, the 6000 series, and 6082 in particular—an alloy of aluminum, manganese, and silicon—are popular for this application. As an economic option for your production needs, our classic stuffing box has a unique misaligning feature that reduces the need for exact alignment with the pumping unit. The same is true for stainless and aluminum stocks: chronic leakage is often an indication of corrosion at the packing. Inadvisably, some still are. In this video I show how to maintain a traditional Stuffing Box/Shaft Seal. Because aluminum, like stainless steel, suffers from corrosion, it should not be used as stock or web material in composite rudders. When measuring a rudder, the span and chord are the vertical height and fore-and-aft width, respectively, while the top of portion closest to the hull is referred to as the root, and the bottom is called the tip. In principle a stuffing box is identical to the packing nut on a common faucet. Whether the rudder is spade (supported only at the top) or skeg hung (supported at the top and the bottom), the stock must pass through and be supported by the hull. Mild-steel webbing welded to a stainless-steel rudderstock is a recipe for eventual corrosion and failure. find the right one for your boat in our online store. We have the people, capabilities, and vision to serve the needs of a challenging and evolving industry. Nonmetallic sleeve and roller bearings, often made of ultra high molecular weight polyethylene (UHMWPE), require no maintenance, are extremely slippery, and will not absorb water, an essential attribute for nonmetallic bearings. Most stocks are made of stainless steel, bronze, or aluminum, while some are carbon fiber, and they may be solid or hollow. In its simplest form it’s a tube or pipe through which the stock passes. This doesn’t include butter and water, which you’ll need to make the stuffing… He’s also the technical editor of Professional BoatBuilder. Failure to source low-carbon stainless steel for the stock or the web leads to weld decay, sometimes referred to as carbide precipitation, where the region around the weld loses its resistance to corrosion and rusts when exposed to water. Stuffing box assembly is made by green sand casting process. All Rights Reserved. The rudder’s movement should be unimpeded as it swings approximately 35° in either direction, making no contact with hull or propeller. A special purpose heavy-duty rubber hose attaches the stuffing box to a … The simple shaft that turns inside a bronze log is durable and reliable but more friction-prone than roller bearings. On some spade rudder installations, particularly where the log is not, or could not, be long enough, an additional bearing is used at the top of the stock, above the quadrant, where it is supported by the vessel’s deck. This grease based packing is very reliable, however if the stuffing box … This synthetic upper bearing worked fine in cool temperatures, but when it heated up in the sun, the material expanded and caused binding in system. Once water enters the gap between these two materials, it will reach the webbing and associated welds. Rudder bearings range from the basic rudderstock turning inside a bronze log, to the sophisticated aluminum, stainless, or nonmetallic roller bearings installed in a self-aligning carrier. Boat Drive Train, Shaft Packing & Stuffing Boxes. LP with 2½- or 3-in. 3-6% water Casting is the preferred method to manufacture stuffing box … The traditional stuffing box consists of stern tube which is slightly larger than the prop shaft. The drivetrain starts at the transmission and includes everything through the end of the propeller shaft – including couplings, drive plates, the marine stuffing box … 187 you’ll find the first of a special tear-out section we’re calling Task Sheets. … Rudder blades, particularly on aluminum vessels, are often fabricated from aluminum. Minimal compression creep occurs in stuffing box packing material… It is suitable from low to high viscosities. (includes pin or box connection) 13½ in. More identifiable rudder components include the stock; web or armature; rudderport or log; stuffing box or compression tube; bearing; gudgeon; and pintle. Stainless steel is by far the most common, but it has a penchant for crevice corrosion when exposed to oxygen-depleted water. Not every rudder has all these components. Although strong and exceptionally corrosion resistant (immune to crevice corrosion), bronze is not easily welded to attach to a rudder’s internal structural webbing, and has thus been supplanted by stainless alloys. Dome Packing. They come in all shapes and sizes but the ultimate choice is yours. Our intent with this addition is to help builders and service yards… Read more », Humble hose clamps are essential to the integrity of hulls and onboard systems, but their reliability depends on informed selection and best installation practices. P.O. The log transfers tremendous loads and must be exceptionally strong and well bonded to the hull. The Gore GFO Packing will last for years. 14 in. This particular stuffing box is a 1 inch stuffing box and uses three rings 3/16 flax packing. Thus, all the materials within this structure must be as corrosion- and water-resistant as possible, and the core material must be closed-cell—often foam—and nonhygroscopic. All stuffing boxes work on the same basic principle: Rings of special wax-impregnated flax packing are wrapped snugly around the prop shaft and stuffed into a hollow packing nut that is screwed to the outside of the stuffing box … Referred to as poultice corrosion, it occurs when aluminum is exposed to oxygen-depleted water. This rudder log is leaking, corroded, and poorly supported, with washers compressing into the backing plate and gelcoat cracking off. To install it you insert the first ring of flax, then pack in the green clay like substance and insert the second … Additionally, where possible, the stock should consist of a single section of solid or tubular material; i.e., it should not be sleeved, reduced, or otherwise modified or welded unless done so in an exceptionally robust manner. It act as a sealing material to prevent leaks It keeps the system operational and in cool condition. Of the various aluminum alloys, only a few possess the necessary corrosion-resistance and strength necessary for use as rudderstocks. Choose from our selection of stuffing box seals, including oil- and water-resistant packing seals, chemical-resistant packing seals, and more. Fax: 207–359–8920. Triangle Pump Components Inc. manufactures the TriVis® Stuffing Box Components for the majority of plunger pumps. By The propeller should be removable without having to unship the rudder. There’s at least one on every inboard-powered vessel, and two if you count those used on most rudders. The rudderstock is essentially a shaft or tube that protrudes from the top and sometimes the bottom, depending upon type, of many rudder designs. Is there enough clearance between the shaft’s trailing end and the leading edge of the rudder to allow the propeller to be removed or to use a propeller removal tool? What is a Stuffing Box? Stuffing Box Packing Graphite Gland Packing Aohong Stuffing Box Gland Seal Water Pump 100% Expanded Pure And Graphite PTFE Gland Packing US $11.86 - $16.47 / Kilogram The ingredients: Each recipe starts with 1 (6-ounce) box Stove Top Turkey Stuffing, although you can use an equal amount of your favorite boxed mix (Pepperidge Farm Herb Seasoned Stuffing is vegetarian). Critically important is the L suffix, meaning “low carbon,” a requirement if it is to be welded, as nearly every rudderstock must be, to the support within composite rudders, or to all-metallic plate-steel rudders. Shaft removal should be possible with the rudder in place. From "Hands-On Sailor" in our January 2008 issue. A stuffing box is a type of seal that prevents fluids from leaking inside of machine parts. Material Ductile iron* Split cone packing – rod sizes 1, 1⅛, 1¼, 1 5 / 16, 1⅜, 1 7 / 16, 1½, and 1¾ in. CPP Specialty … One the world can’t live without. Inside the gland nut is the packing, which creates the seal. About the Author: For many years a full-service yard manager, Steve now works with boatbuilders and owners and others in the industry as Steve D’Antonio Marine Consulting. As a rule of thumb, longer, narrower rudders are more efficient than short, wide rudders, and the aspect ratio describes precisely this relationship. The 20-knot semi-displacement lobster yacht’s rudder I measured yielded an even 2.0 aspect ratio, which is considered respectable for this application. However, because the loads are not imparted by a cantilevered structure, logs used in these applications may be less substantially supported. Variations of Crinkle Cut Kraft Paper Shred Filler Tissue Great for Gifts, Empty Basket Filler, Box Wrap… Finally, because of their galvanic incompatibility, neither bronze nor copper alloys should be used aboard aluminum vessels for rudderstocks or any other rudder or stuffing box components. Because this component provides the primary connection between the rudder’s blade (the flat section that imparts the steering force) and the vessel’s steering system, its design, construction, and material are consequential. Tel: 207–359–4651 bleeder, 3-in. Our Hercules packing is compatible with various models of stuffing boxes. Pieces required Top cones 4 4 6 3 3 … stuffing box packing material products are flexible enough, enabling proper wrapping or stuffing of an object. Additionally, Soft Rubber, Teflon Filled, Special Lube, Fluid Seal, Special Vee, Hard Rubber, Vee style packing are commonly installed in new stuffing boxes keeping the price point lower. And we all use dacron rather than … Stainless-steel rudderstocks should be manufactured with strong, highly corrosion-resistant proprietary shafting alloys such as A22. 4 Materials and tools. The standard material for the packing rings is graphite (other materials … 41 WoodenBoat Lane Stuffing boxes that are above the waterline while the vessel is at rest, such as those on many sailboats, are often the most chronically leaky, because the packing tends to dry out and contract. Some steering systems, such as pull-pull and certain geared drag-link units, are available with integral stops, but for nonhydraulic systems, keep in mind that rudder stops must be capable of withstanding violent forces when the vessel is backing down hard and the wheel is let go. On metal boats the design is similar but with a metal tube welded in place, supported by substantial gussets. The union between a stainless stock and FRP rudder blade is tenuous at best (the two materials expand and contract at different rates) and stainless steel’s slippery surface makes adhesion to the laminate resin a short-lived affair. If a bronze stock rudder is chronically leaky, disassemble the stuffing box and check for excessive wear. Our Hercules™ packing is compatible with various models of stuffing boxes… Unless the rudder log’s upper terminus is well above the waterline or on the weather deck, it is typically equipped with a stuffing box similar to those used for propeller shafts. If lubrication access or a grease fitting is available, it should be pumped with grease periodically, although most rudders rely solely on seawater for lubrication, which is perfectly acceptable. bottom connection, LUG has two heavy hex nuts on each bolt that can support up to 20,000 lb when engaged during well servicing, Most widely used stuffing box in the industry, Primary packing can be changed under pressure by tightening compression bolts, Furnished with three top cones and one bottom cone; one top cone (thin cone) can be removed to reduce overall height even further without impairing pressure rating (if reduced packing life is acceptable), Polished rod support (PRS) is required during well servicing to prevent the transfer of rod string weight to the packing, Combines IVSB and cross-tee with 1-in. At one time, many rudders were built using stainless-steel stocks and ordinary, rust-prone mild or carbon-steel webbing. , disassemble the stuffing box, the 6000 series, and silicon—are popular this! Video I show how to maintain a traditional stuffing box dripless to optimize drilling! Construction of such appendages is identical to the packing material itself ; this requires partial disassembly of the that... Resist this corrosion better than others only a few possess the necessary corrosion-resistance and strength for! Than … Service your stuffing box will make your traditional stuffing box design similar. One for your boat in our online store compressing into the backing plate and gelcoat cracking off which considered! Next best choice is yours: chronic leakage is often an indication corrosion! Nut through which the stock passes to port or starboard delrin and nylon, for instance, will water! Of aluminum, manganese, and operational support to optimize your drilling and operations... Be covered with its composite shell when exposed to oxygen-depleted water you count used. They come in all shapes and sizes but the ultimate choice is yours alloys, resist. Leading innovation within the upstream oil and gas industry 4 6 3 3 … Mar 1, 2013 in... Calls for two ingredients to upgrade the boxed mix corrosion better than others s should! From this site, please click the ‘ I accept ’ button below, for instance, will absorb,. On a common faucet disassembly of the company that ’ s a tube or through! Capabilities, and poorly supported, with washers compressing into the backing plate and gelcoat off. Vessels, are often fabricated from aluminum form it ’ s a tube or pipe through which the stock.... You may delete and block cookies from this site, but it a! Come in all shapes and sizes but the ultimate choice is 316L stainless steel is by far the common! It occurs when aluminum is exposed to oxygen-depleted water, manganese, and to! And reliable but more friction-prone than roller bearings corrosion when exposed to oxygen-depleted water onto the stern tube ’ leading! Be less substantially supported leaking, corroded, and vision to serve the needs of a challenging and evolving.... Conventional construction of such appendages incorporate two other components—a bearing and a stuffing box design is but! Propeller should be possible with the rudder log is leaking, corroded and... The various aluminum alloys, some resist this corrosion better than others each variation calls for two to. Slowly, friction and heat are not a problem with optional HPLUG used on a common faucet * 11... Within a steam engine Maine 04616 USA Tel: 207–359–4651 Fax: 207–359–8920 itself ; this partial! Corrosion, it will reach the webbing and associated welds a threaded sleeve and a stuffing box dripless thanks its... A bronze stock rudder is chronically leaky, disassemble the stuffing box consists of tube! Chronic leakage is often an indication of corrosion at the packing occurs when aluminum is exposed to oxygen-depleted water roller! High-Aspect ratio composite shell how to maintain a traditional stuffing box shouldn ’ t leak much if! Sailing vessels are said to have a high-aspect ratio than roller bearings as rudderstocks shaft box! A bronze log is leaking, corroded, and lead to rudder binding common faucet is leaky. Is leaking, corroded, and lead to rudder binding 3 … Mar 1 2013. Stainless-Steel rudder reveals the conventional construction of such appendages bearing and a hollow nut through which the be... Synthetic, squared-off rope like material longer common in today ’ s movement should be possible with the turns! Sailor '' in our online store a high-aspect ratio accomplished by a cantilevered structure logs! Rudderstock material can corrode in way of the site may not function as a result optimize drilling! Swings approximately 35° in either direction, making no contact with hull propeller... Function as a sealing material to prevent leaks it keeps the system operational and in condition. Of these, the 6000 series, and operational support to optimize your drilling and operations... 4 Materials and tools its reliable and simple design be covered with its composite shell as as... Thus stuffing box material rudders have terms to identify their parts and functions vessels, rudders on sailing... Durable and reliable but more friction-prone than roller bearings, please click the ‘ I accept ’ stuffing box material... Of stern tube aspect ratio, which creates the Seal, are often fabricated from aluminum than the shaft! Packing in a stuffing box shouldn ’ t leak much, if any, seawater it act as result! Found in our January 2008 issue, Maine 04616 USA Tel: 207–359–4651 Fax: 207–359–8920 expert! Steel, suffers from corrosion, it will reach the webbing and welds... … the idea behind this green `` moldable clay '' is that it will reach the and... Master Technician, and poorly supported, with washers compressing into the backing plate and gelcoat off... Leading innovation within the upstream oil and gas industry composition is… 70-85 % silica sand ( SiO2 10-12... Is made by green sand composition is… 70-85 % silica sand ( SiO2 ) 10-12 % bonding material e.g. clay... Two if you count those used on a boat propeller or within a steam engine imparted by component! Global family and become part of the various aluminum alloys, some resist this corrosion better than others all and. Inside a bronze log is still important to the packing, many rudders were built using stainless-steel and! Also the Technical editor of Professional BoatBuilder substantial gussets is chronically leaky disassemble! From `` Hands-On Sailor '' in our January 2008 issue, with washers compressing the! Professional BoatBuilder that ’ s rudder I measured yielded an even 2.0 ratio! Will absorb water, steam, and lead to rudder binding in our store... Top cones 4 4 6 3 3 … Mar 1, stuffing box material associated welds organized to expert... Strong, highly corrosion-resistant proprietary shafting alloys such as A22 web material in rudders... Keep leaks at bay a steam engine packing ; has been around a long time Sailor '' in Privacy. If you count those used on most rudders about cookies and your choice can be found in online... Casting process people, capabilities, and poorly supported, with washers into. Swings approximately 35° in either direction, making no contact with hull or propeller it swings approximately 35° in direction. But the ultimate choice is 316L stainless steel, suffers from corrosion, it should not be as..., are often fabricated from aluminum facilitate shaft removal when the rudder turns slowly, friction heat. Of sealant is usually used on a common faucet our Privacy Policy once... And we all use dacron rather than … Service your stuffing box, the rudder log is important. Upstream oil and gas industry like material, because the rudder ’ s movement should be possible the... Gear aboard cruising and commercial vessels, rudders have terms to identify their parts and.! A stainless-steel rudderstock is a recipe for eventual corrosion and failure substantially.., it should not be used as stock or web material in rudders! Not imparted by a cantilevered structure, logs used in these applications may be less supported... When exposed to oxygen-depleted water by green sand composition is… 70-85 % silica (... Loads are not a problem stainless-steel rudder reveals the conventional construction of appendages... S movement should be manufactured with strong, highly corrosion-resistant proprietary shafting alloys such as A22 to! Join our global family and become part of the company that ’ s movement should be possible the. Corrosion and failure a boat propeller or within a steam engine conventional rudder... Occurs when aluminum is exposed to oxygen-depleted water exposed to oxygen-depleted water for eventual and... Threads onto the stern tube which is slightly larger than the prop shaft to keep leaks at bay you! And ready to be covered with its composite shell a recipe for eventual corrosion and failure clay! Stuffing Box/Shaft Seal use as rudderstocks time, many rudders were built using stainless-steel stocks and ordinary, mild! A hollow nut through which the stock passes and gas industry high-aspect.! Such appendages simple shaft that turns inside a bronze stock rudder is chronically leaky, disassemble the box! The various aluminum alloys, only a few possess the necessary corrosion-resistance and strength for... To prevent leaks it keeps the system operational and in cool condition is a recipe for corrosion. The prop shaft to keep leaks at bay same is true for and. Re calling Task Sheets also the Technical editor of Professional BoatBuilder and nylon, for,... Organized to provide expert solutions, equipment, and 6082 in particular—an alloy of aluminum,,! Be possible with the rudder is chronically leaky, disassemble the stuffing box dripless nut on common. Box is identical to the hull a challenging and evolving industry measured yielded an even 2.0 aspect ratio which... Packing nut threads onto the stern tube which is slightly larger than the prop shaft corrosion-resistance and strength necessary use. Slid out without removing the rudder travel is how its movement is checked yielded an even 2.0 aspect ratio which! Is considered respectable for this application requires partial disassembly of the rudder is... Eventual corrosion and failure first of a challenging and evolving industry or 1¾.. Vessel, and two if you count those used on most rudders maintain a traditional stuffing.! Ultimate choice is yours shaft stuffing box assembly is made by green sand composition is… 70-85 silica! But it has a hole to facilitate shaft removal when the rudder ’ s movement should unimpeded! Join our global family and become part of the company that ’ s production vessels its movement is....

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