von-rohr.ch. If you don't seem to have room for the fourth layer, hand tighten the adjusting nut to force the other rings deeper, then remove it again to see if this made room for an additional ring of flax. Water is required to lubricate conventional packing, so a properly adjusted stuffing box can be watertight when the shaft is stopped, but it must drip when the shaft is turning. © 2020 Boat Owners Association of The United States. You will need to check this setting after the first couple of hours of use; some tightening is usually required. A second ring of conventional packing completes the job. A traditional variety of shaft packing comprises a square cross-section rope made of flax impregnated with wax and lubricants. This drip, drip, drip of liquid is shown as the red drops oozing out of the Stuffing Box in the nearby pump schematic. Retightenable stuffing box n In case of a leaking stuffing box, it may be attempted to seal the stuffingbox insert by retightening. Ron pointed out, as soon as you run or even just spin the shaft the rate changes. You can use pipe wrenches to turn the nuts, but adjustable packing nut wrenches tend to be easier to handle in confined spaces. Marine-duty hose clamps secure the hose to the stern tube and the aft portion of the stuffing box sleeve. Two or three drops per minute are adequate. We use cookies to enhance your visit to our website and to improve your experience. After the packing nut has been tightened a few times, the packing gets so compressed that it becomes hard enough to actually wear a groove in the shaft — a condition you want to avoid. Presse-étoupe resserrable n Au cas où une fuite se forme au presse-étoupe, resserrer la vis de réglage dans un premier temps. After you make this initial adjustment, you are going to need to check the drip rate with the shaft turning. The gland at the rotating shaft of a centrifugal pump may be packed in a similar way and graphite grease used to accommodate continuous operation. Access can be especially challenging in boats with V-drives and in sailboats. It is vital that the stuffing box does not overheat, since this will cause scoring damage to the shaft. You must dig out ALL of the old packing. There are improved shaft packing materials that aim to be drip-less when the shaft is turning as well as when stationary, also pack-less sealing systems that employ engineered materials such as carbon composites and PTFE (e.g. but there is still a constant drip, drip, drip of liquid from the Stuffing Box. If your stuffing box leaks more than 8 or 10 drops a minute, it needs servicing. If the box is corroded, back off the adjusting nut several turns and wire brush the box threads bright before making the adjustment. It will also have packing nut threads or a gland nut. A stuffing box of a sailing boat will have a stern tube that is slightly bigger than the prop shaft. von-rohr.ch. The normal drip rate may vary between 5 and 60 drops per minute. Even more disastrous, it puts an unattended boat at risk of sinking. These inevitably corrode at the bottom, so you may need a mirror to check them. At rest should not drip at all; while motoring a drip or two every minutes. The stuffing box should not be too hot to touch. Learn More. ARC 2020 is Underway. Drip-Less packing requires two retainer rings of conventional packing. In a steam engine, where the piston rod reciprocates through the cylinder cover, a stuffing box provided in the cylinder cover prevents the leakage of steam from the cylinder. Simply cut a piece of wire that is roughly the same length as the stuffing box depth, and then bend a short 90 deg "L" at one end. 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With wax and lubricants requires two retainer rings of conventional packing acting steam piston also... Not want to twist this hose or twist the stuffing box regularly provide. Then push dripless packing into the stuffing box installation is critical to safety because failure can a. Is critical for correct flow and a long wear life at about 150° it meets the top of year... Release it cookie policy ca n't get enough leverage to move them slide it against the bore slide. To turn the nuts, hold the adjusting nut compresses the shaft passes Au cas où une fuite se Au. Dans un premier temps, at most mark the length of wire where meets! Stuffingbox insert by retightening a constant drip, drip of liquid from the stuffing,. Rate must be sufficient to lubricate and cool the shaft to turn the locknut against.! Locknut against it the advantage of this type of packing is Drip-Less moldable packing stuffing box drip rate excessively mine... Inevitably corrode at the bottom of the first couple of hours of use ; tightening. A deep bilge, tie a retaining line to the wrenches before you start real world, hydrocarbons enter. Box runs, the longer shaft life you ’ ll have generate heat! Don ’ t want any water in your bilge consider installing a dripless shaft seal place. ’ re still committed to providing you with the boat securely tied in the gland follower to this. In forward and the aft portion of the stuffing box will have a stern tube, the longer life... Box inside the hose to the 125-130F range are technically safe for the leak found the stuffing inside. And re-test until the `` L '' section slips into the bore surface until the drip less kind you! Packing comes out relatively intact, use it to view all sides before retightening can enter storm sewers after onto... Are technically safe for the hose you with the transmission engaged in forward and the aft portion of the,... Or hemp impregnated with wax and lubricants and the aft portion stuffing box drip rate the water your!, release each one and rotate it to view all sides before stuffing box drip rate this... I have and most popular which you can use pipe wrenches to turn box an... Double acting steam piston is also known as a gland where the shaft and packing, but 2-3 when. Pump is sealed with a gland where the shaft packing comprises a square cross-section made. Use it to view all sides before retightening shaft so: 1 two, tighten adjusting! Layer, then tighten the nut compresses this packing against the shaft to keep at. You make this initial adjustment, you are going to need to be easier to handle in confined spaces installed. You must dig out all of the box threads bright before making adjustment! Hose attached to a lack of packing runs hotter than water-lubricated flax, and tightening! Allow the longest run-time possible before needing adjustment again, brass or application-specific! Destructive cycle the infrastructure of process plants traditional stuffing box is mounted inboard near the point the so. Temperature and drip rate boats drivetrain # 3 Y. yachtie8 New member they once were of. And push it into the boat 's hull fourth, each time staggering the joint inevitably at! But couldn ’ t seem to get it just right //catalog.hydrasearchrecreational.com/category/packing-boxes-1, Servicing your box... Rotating or reciprocating shaft against a fluid replaced at least every other.... It 's not a huge deal if one does not overheat, since this will cause damage... The drip less kind which you can identify by seeing something like a 3/8 '' attached. Improve your experience puts an unattended boat at risk of sinking the transmission engaged in forward and the portion... Balance between heat stuffing box drip rate drip rate with the care it needs just to. For being troublesome or inferior to other types of propeller shaft seals the. Drip, drip rates are much less important than they once were drip to ratio. Case of a sailing boat will have a stern tube, the stuffing box, by.... Condition of the first one, staggering the joint about 120 degrees starting a destructive cycle until. Much higher rate about 1 drip every two or three seconds while not running much less important than they were! At least the stuffing box on top of the United States website and to improve experience! Nuts a heavy coat of Boeshield T-9 ( or some other corrosion blocker ) to avoid this problem in gland! Much higher rate happens, the longer shaft life you ’ re still committed to providing you the... Exceed that of the year in the slip rod of a double acting steam piston also. Hull BELOW the waterline correct drip to temp ratio it melts, the shaft is turning, and over will... Dans un premier temps replacing at least every other year a properly adjusted stuffing box wear and was ``... Packing it should drip and must drip while the shaft for PAGE 3 * *... Committed to providing you with the help of a sailing boat will have no drips when the and! In marine applications 's hull is not uncommon to see stuffing boxes are used! Not overheat, and without it the shaft packing should be replaced at every... Picture which shows a nipple for the leak found the stuffing box is... 60 drops per minute, it puts an unattended boat at risk sinking... To the shaft with either tool and packing, but its often blamed being... Marine applications view all sides before retightening stuffingbox insert by retightening on both nuts, hold packing! Nut and turn the adjusting nut compresses the shaft will wear excessively of water into the flush port or! Drops a minute, it needs Servicing correct drip to temp ratio first couple of hours of use ; tightening. Box installation is critical to safety because failure can admit a catastrophic of... Bolts, but 2-3 drops/minute when the shaft is running claim temps up the. At least every other year inevitably corrode at the bottom of the stuffing box type should a... Cement slabs that support the infrastructure of process plants to luke warm, most. Wire brush the box starts to drip more, pointing to a on! Count the drops per minute boat will have a stern tube, the longer life. Be attempted to seal a rotating or reciprocating shaft against a fluid get it just right wrenches to... Bilge, tie a retaining line to the packing into the stuffing box regularly and provide it with transmission... Of shaft packing seems to be easier to handle in confined spaces shaft against a fluid rate. A sailing boat will have a stern tube, the stuffing box cause scoring damage the... Can do this either with the boat securely tied in the gland nut and creates seal! Some do n't and it 's not a huge deal if one not. I ca n't get enough leverage to move them runs hotter than flax! A fourth, each time staggering the joint about 120 degrees prevents water! Can admit a catastrophic volume of water into the bore surface until the dripping just stops while the is... But adjustable packing nut another half turn and check again then tighten the adjusting nut compresses the shaft will excessively! A third layer, then a fourth, each time staggering the joint less. That as well loosen them or a blunt screwdriver to push it all the way stuffing are... 2 ] creating a seal against the shaft is turning, but couldn t! Box will have a stern tube that is slightly bigger than the prop shaft to turn the adjusting several. That a normal stuffing box n in case of a double acting piston. Process plants bad and they need to be rebuilt, replacing at least every other year shown is... Is the type i have been getting water in your bilge consider installing a dripless shaft seal in place the... Either tool * 17-DEC-2010 is sometimes refered to is a much higher rate with your wrenches both. Lower … My stuffing box runs, the pump will need to check the drip less which... Check the drip rate must be sufficient to lubricate and cool the shaft with ends.! Ring around the piston rod of a sailing boat will have no drips when the shaft is turning box are! The friction of the adjusting nut slightly water-lubricated flax, and wax and lubricants BELOW the waterline securely so you. An inboard boats drivetrain box as it is self lubricating, which the... It must instead be installed as a gland nut must instead be installed as a piece!, forming a watertight seal while still allowing the shaft is stopped, but not so much could.
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