Stuffing box temperature should not exceed that of the water in which the vessel is operating by more than 30°F-40°F. 33442, USA; National Toll Free: 1-800-420-0949 Local or International: 954-420-0949 Order Fax: 954-420-0945 Accounting Fax: 954-420-5234 Purchasing Fax: 954-428-5288 Contact Us 1) ... with a hump hose attaching to the hull shaft seal box … As an illustration of its longevity, when working as a young mechanic, as part of a repower project, I installed a face seal stuffing box on a yacht club launch.  Years later I returned to visit my former workplace and decided to check on the engine as well as the seal.  I reviewed the installation and it appeared very much the same as it did when I  first installed it.  Later on I inquired with the yard manager, “So how has that dripless shaft seal [they were new at the time] held up?”  I asked.  “What seal?” was his reply, which spoke volumes; the seal had been neither serviced nor adjusted since it was first installed (all stuffing boxes, dripless and conventional, should be inspected regularly); the engine’s clock had just clicked over the 2000 hour mark.  Such long-lived performance is not unusual for properly installed face seals; exceptional longevity is among their most noteworthy attributes. All Rights Reserved. There are a number of manufacturers of dripless shaft seals and a variety of designs. Was offered a free dripless but knocked it back.  At least one dripless stuffing box manufacturers prohibits the use of ozone generators with their products, take heed to this warning, I’ve witnessed the damaging effects of these devices on rubber and plastic components. The stuffing box uses a piece of heavy duty hose to hold the packing gland and there is arguably more torque on that hose from the friction of the packing than from the carbon block sliding on the stainless ring of a dripless type. The caveat involves the method by which water is drained from the engines’ exhaust systems. Lip seal stuffing boxes typically rely on an integral support mechanism that’s not unlike a shaft bearing.  Made up of a synthetic material into which flutes or grooves have been cut to facilitate water flow, it centers and steadies the stuffing box on the shaft.  As a result, this type of seal tends to be somewhat less sensitive to misalignment between the shaft and shaft log. With one caveat, most twin-screw installations, both lip and face seals should be equipped with parallel cooling water plumbing. If you yearn for the proverbial dusty bilge, a dripless stuffing box is likely the only way you will achieve this goal.  Make certain you, or whoever you entrust to install a dripless stuffing box, fully reads and understands the instructions, even if you, he or she has installed them in the past, as manufacturers update and change these guidelines.  Finally, make certain you also understand service intervals, particularly bellows replacement, which may be required after a given number of years, regardless of use. With less water in the bilge, corrosion and odors can be reduced. The hose used to supply water to the stuffing box must be flexible, however, PVC hose such as that used for potable water, shown here, should not be employed, as it lacks the necessary robustness for raw water use. The old flax rings serve to hold the new plastic stuffing material in place. Depending on the vessel’s speed, water injection can be obtained from a pressurized source (i.e., the engine’s raw water cooling circuit; from a forward facing ram or scoop mounted to the hull; or it can simply be a riser that allows trapped air to escape, thereby ensuring the seal remains submersed). The special lubricant and packing eliminate the need for water to lubricate and cool the rotating shaft. A small sailing craft is not only beautiful, it is seductive and full of strange promise and the hint of trouble.”  I’d argue, of course, that it could be any craft, power or sail, large or small, her destination and from whence she hails, or the waters she plies matter not.  White’s words embody what so many of us feel when we are afloat, and in a kingdom of our own.  The “…hint of trouble” part is especially attractive to me, in that my goal is to help others avoid it, by making certain their vessels are seaworthy, reliable and safe. Use the search box above for best results, Chesapeake, VA – week of December 6, 2020. Type B fuel, on the other hand, is both rugged and flexible and is well-suited to this role.  For the ultimate in flexibility and longevity silicone hose can be used, however, it kinks easily, and thus it must be routed with care. My 36’ sailboat has a traditional stuffing box with Goretex packing that has served us fine. This arrangement ensures that, when operating on one engine, windmilling shaft’s seal will remain lubricated and cool. Two pipe wrenches are the tools needed for adjusting the stuffing box.  I’m certain I was seasick until we turned due south nearly a week out; that’s how I know I read these lines after leaving  Bermuda on our starboard beam.  Prior to that I had no interest in anything beyond standing my watch and trying to figure out the best way to keep food down.  The ship’s library included a compilation of short sea stories, one of which was White’s, entitled, “The Sea and the Wind that Blows”, first printed in 1963, along with the above quote.   It’s short, lovely and I recommend it highly. In its traditional form the conventional stuffing box, discussed last month, carries out a … Lip seal injection hose should meet the manufacturer’s requirements. Thomas Marine Hardware’s ISB-SA system.. This sort of reliability can only be achieved, however, if the installation follows the manufacturer’s instructions without deviation.  A few of the more frequently violated installation guidelines (in addition to the aforementioned absent double set screws) involve incorrect compression of the bellows, resulting in too much or too little tension between the seal faces, and either leakage or overheating. This month’s Marine Systems Excellence eMagazine covers the subject of dripless stuffing boxes, I hope you find it both useful and interesting. Carbon graphite is tough, durable, and abrasion resistant, and with just a very slight film of water between it and the stainless steel ring, the system works quite well. Lip seals have been around for almost as long as internal combustion engines; they are used to seal crank and transmissions shafts, as well as in a variety of other industrial applications. ... Next month I’ll delve into the intricacies of dripless stuffing boxes. Fort twin screw applications, dual water injection enables one engine to supply water to both seals when operating on one engine.  The stuffing box shown here includes an optional second injection point, which is paralleled with the other shaft’s stuffing box. In its traditional form the conventional stuffing box, discussed last month, carries out a vital role, allowing a spinning propeller shaft to pass from the inside to the outside of the hull, while keeping the water out.  It has worked well and reliably aboard thousands of recreational, commercial and military vessels for over a century.  It’s simple, rugged and for the most part exceptionally reliable, although it requires routine maintenance, adjustment and periodic repacking.  Varying designs and installations carry with them varying degrees of watertight integrity. Not much. Slight pressure is applied between the rotor and stator using spring tension, this is typically built into the bellows-type stuffing box hose, which supports the stator.  During installation the stainless ring is carefully positioned on the shaft so as to compress the spring/bellows by a pre-determined amount, thereby establishing the correct level of pressure between rotating and stationary components, and then retained in place using double-stacked cupped set screws (many of the installations I inspect lack the double set screws because installers assume the second set to be spares). The PYI dripless shaft seal is a mechanical seal that uses a self-aligning carbon-graphite stator to ensure a 100% watertight seal with proven reliability. Inboard boats use stuffing boxes or shaft seals to prevent water from entering the hull. Because the bilge should normally be dry, any water that does show up warrants immediate investigation. Lip seals like the one shown here are self-centering, they rely on the interface between the lip and the spinning shaft to make a watertight seal.  The one shown here is equipped with a spare seal carrier, which retains and protects a set of replacement seals. Even though the film between the seal surfaces is ever so slight, water moving through the seal and bellows ensures it remains present and, in the process, absorbs and removes heat. Yet another method of achieving a drip-free seal involves the use of a lip seal.  Lip seals have been around for almost as long as internal combustion engines; they are used to seal crank and transmissions shafts, keeping oil in and dust out, as well as in a variety of other industrial applications. © 2020 Cruz Bay Publishing, Inc., an Active Interest Media company. the seal must use an active water supply rather than a simple vent.  For all seals, the water injection flow rate, some manufacturers specify a required minimum flow rate, should be verified at the time of installation and again periodically thereafter. It’s flaw, albeit necessary, and one many perceive as a fatal one, is its propensity to leak or drip. Stuffing box is no problem for me gary. It offers the convenience of a PSS "dripless" yet adds the bullet proof reliability of a traditional stuffing box. I’ve encountered this scenario many times, and the stuffing box itself is often pointed to as the culprit, when in fact the problem lies with the original engine and shaft installation. The PSS Shaft Seal is a mechanical seal and is installed as standard equipment by many of the worlds most reputable boat builders and yards. Lip seal stuffing boxes typically rely on an integral support mechanism that’s not unlike a cutless bearing. If portions of the exhaust are higher than the engine’s riser, then such a crossover method must include isolation valves to prevent catastrophic flooding of the engine’s cylinders. Advocates of dripless shaft seals are quick to point out their benefits over conventional stuffing boxes (no leaks, no flax to replace, no shaft scoring) but the zinger is always the same - "they're maintenance free!" Remarkably, the seal had been neither serviced nor adjusted since it was first installed; the engine’s hour meter had just clicked over 3,000. Face seals rely on stacked set screws to secure the rotor.  In many cases the second set screw is, like the one shown here, not installed. It ensures that the packing material within it remains wet, lubricated, and cool. Slight pressure is applied between the two using spring tension built into the bellows-type stuffing box hose. eMagazine Subscription . Years later I returned and decided to check on the engine installation as well as the seal. 128 posts. Address: 3251 SW 13th Drive STE A Deerfield Beach, FL. To locate yours, trace the propeller shaft from the transmission to the point where it exits the hull. For after-market installations, shafts should be closely inspected for defects in the area where the seal will ride.  If no substantial issues are found, the surface should be, once again, cleaned according to the manufacturer’s instructions. The PYI PSS packless dripless 02114200 shaft seal is a mechanical seal that uses a self-aligning carbon-graphite stator to ensure a 100% watertight seal. If the shaft is not centered in the shaft log, or if the shaft vibrates excessively, leakage can result. Temperature remains a valuable indicator of a seal’s functionality, if it’s significantly hotter than the water in which the vessel floats, it’s almost certainly not receiving enough flow.  If they get hot enough both lip and face seals will overheat, and fail, which will lead to leaking. PYI Inc. is a premier manufacturer and distributor of high quality marine, boat, yacht, and ship equipment and supplies. A friend almost lost his 44’ sailboat to a dripless seal, and I’ve heard of other problems with the system. When installed properly, lip seals can be expected to provide a thousand hours or more of leak-free service. 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