I don't tend to see these issues with Aqualoy 22 shafting but I have seen it with bronze and lower grades of stainless. Razor blades are cheap. While this is a common practice, it should be noted that 3W on the pressure side and 2W on the gland end of the stuffing box can also be used. In stock and ready to ship. If oil, grease, or graphite impregnated packings were used, it may be necessary to use a solvent to clean the stuffing box. I generally don't like rules-of-thumb for drip rates and really hesitated to even put one on here. Doing this will severely shorten the life of your packing and it will start leaking continuously in short order. Seal chamber bore is 43⁄ 4 inches (121). There’s at least one on every inboard-powered vessel, and two if you count those used on most rudders. Measure these temps after the shaft has spun for a while. f. Carefully clean the stuffing box. The selection of appropriate packing, the cutting methods like straight and angular, the means to extract the old packings, the standard sizes available commercially, length measurement procedure, Inserting procedure in the stuffing box… Hence my search for fixed-size, stub wrenches. 2. To get the cross-sectional size, subtract the inside diameter measurement from the outside diameter measurement and divide the difference by two. You must be sure to offset the rings butt joints 1/3, 1/3, 1/3 for a three ring box or 1/2 & 1/2 or said another way 12 o'clock and 6 o'clock for a two ring box. Little details like this make for an easily adjusted stuffing box with a correct drip to temp ratio. 0.002 in. When initially installing the rings of packing LIGHTLY tighten the nut just until you start to feel some resistance then stop! Hey I bet West Marine could sell one for $50.00......Hmmmmm... Graphite is one of the most noble metals on the galvanic scale and is basically at the top. *17 inch sizes have 21⁄ 4 inch (57) shaft diameters in stuffing box/seal chamber with sleeve. If you have a bronze shaft use extreme caution with graphite impregnated packing materials. April-15-2005. 0.018 in. The cooler your stuffing box runs, the longer shaft life you’ll have. Consult the packing manufacturer of your choice for the proper set-up to best service your application. In my opinion & experience monitoring stuffing box temps over a 6+ year period, 125F – 130F generally means there is not enough cooling flow through the box. You can actually use an infrared thermometer, often called a pyrometer, to make this adjustment process easier but usually your hand will suffice as a good gauge. ... Buck Algonquin Bronze Packing Boxes are usually the following sizes and take the following packing size: Shaft Size Packing Size … Measure the depth at which the flush port enters the inside of the stuffing box. Here are some guidelines: Shaft Size Suggested Packing Size… Some nuts can actually fit four & if so go for it but make sure you have enough threads to get a good hold for the female nut. I've provided full installation instructions for that type of seal too in the gallery preceding this one. Stuffing Box Basics. The product I used above for this article was Western Pacific Trading GTU from West Marine. Gore recommends not adjusting the stuffing box until you have run the boat in gear for about two hours of time. Please use due diligence to determine the proper packing size for your particular stuffing box. This photo shows the female nut sliding over the "flax seating tool" and seating the flax. Typical shaft stuffing box (gland shown open) and drive shaft. 1. In my opinion this generally means there is not enough cooling flow through the box. Seal gland alignment boss to stuffing box. W.L. Well.. A depth dimension of 5W is used where lantern gland is omitted. Going one size to big can eventually wear a groove in the shaft and one size to small will never seal properly. Packing Material: We recommend three rows of Duramax Ultra-X packing be used when packing our traditional bronze stuffing boxes … Re: Packing Size for Stuffing Box « Reply #3 on: February 17, 2013, 06:43:17 PM » Just for reference, my shaft is stainless 1 1/8", not the original bronze shaft. Only when all rings are in the nut can you then tighten it. It does not fray when cut like GTU does. 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. g. Use precut packing kits, purchased from FNW, or carefully cut each ring by wrapping a length of packing around the blade snugly, but without tension. And, they don't hold the adjustment very well. To determine the correct packing size, measure the diameter of the shaft (inside the stuffing box area if possible) and then measure the diameter of the stuffing box (to give the O.D. Perhaps, to prevent fraying with GTU, you could heat up a little wax in a bowl and as soon as you cut the ring dip the ends in the wax like whipping a line. Regular Inverted Stuffing Box (IVSB) Tee Base Inverted Stuffing Box (IVSBT) • Exceptionally rugged; built for performance under tough conditions • Primary packing can be changed … Available sizes When a stuffing box starts to leak excessively, you should tighten the packing nut until the leak stops. The photo to the left is Duramax Ultra-X which has a very similar construction and braid to Gore GFO. The result is the required size. It should be noted that ABYC P-6 specifically says this: That being said there are thousands of happy boaters who have had decent results with these packings. While this is a common practice, it should be noted that 3W on the pressure side and 2W on the gland end of the stuffing box can also be used. For this process I cut the 1-1/4 inch PVC pipe to 2-1/2 inches long. It fit, but was very tight in the packing nut. Here's the finished product after installing three new rings of GTU packing. Our SB-Series Stuffing Boxes are compatible with our exclusive RE Thomas Marine Hardware stuffing box wrenches. measurement from the O.D. 8. I then inserted this 2-1/2 inch piece into my bench vise and used a hack saw to make two more cuts. The cooler your stuffing box runs, the longer shaft life you'll have. This is the last step! Gland Take-up: This gland take-up is limited to 40% of the packing. In this picture I have two of the three rings wrapped around the shaft in a stepped and alternated order. Then, calculate the number of packing rings that should be inserted below the lantern ring in order to ensure proper alignment. Old Teflon RIngs & Syntef Shown With GTU Rings. To build this device I decided to use a short piece of 1-1/4 inch PVC pipe with about 1/3 of it cut out so it would fit over my shaft. Use a packing tool like I show below to compress them into the nut. How to determine packing size. If you want a totally dry bilge then a dripless type gland such as a PSS or Las-Drop is the way to go. Here's an image of a finished 45 degree cut. 4. Chamfer Angle: Wedging or guiding action is best between 15 and 30 degrees. GFO and Ultra-X barely fray at all. Size Limitation: In designing equipment with shaft below 5/8″ (16mm) diameter, consult with individual packing manufacturer regarding packing space required (W). The GFO Shaft Packing is easy to install, remove the old flax from the stuffing box, measure the drive shaft and cut the GFO at the mark squarely in order to install it. I don't advise the use of a pick to stuff the flax into the nut as this can cause significant unlaying or twisting of the flax especially with GTU. I would try to avoid the GTU packing sold at West Marine if you are concerned about the ends fraying. The shaft was in fine condition when packed and a year later this is what it looked like. Boat Drive Train, Shaft Packing & Stuffing Boxes. to 0.004 in. I used it because it's all I had on hand and I also own a heat gun so it was very easy to heat the PVC and wrap it around a piece of scrap 1 inch dodger tubing for a perfect heat formed fit. Consult the packing manufacturer of your choice for the proper set-up to best service your application. Johnson Duramax Ultra-X can be purchased by the foot from Hamilton Maine and it cuts cleanly. Please use due diligence to determine the proper packing size for your particular stuffing box. Proper adjustment for GFO, GTU or Ultra-X is up to a few drops per minute when the shaft is spinning. Lantern Ring: (Also known as Seal Cage) – The suggested depth or length of lantern ring is set at 2W. It is easy to determine which size GFO fiber packing you need. Gland Entrance: It is recommended that a minimum of 1W be maintained to minimize the probability of gland cocking, and allow for general variations of soft packings, molded, and other types. Performance: Performance at various high speeds is a function of the material used rather than the stuffing box dimensions, and recommendations for speed limits are not considered here. © 2020 Industrial Resource Service Inc. All rights reserved. Lantern Gland Position: It should be noted that the illustration shows the dimensions of 2W on the pressure side of the lantern ring and 3W on the gland end of the stuffing box. Please do not get in the habit of tightening the stuffing box when "leaving the boat". This nut fits three, some don't and it's not a huge deal if one does not fit more than two. Pieces … Please use these packings. Whether you have a mild or extreme application, our various packing … 2. ... Split cone packing – rod sizes 1, 1⅛, 1¼, 1 5 / 16, 1⅜, 1 7 / 16, 1½, and 1¾ in. Any entrapped air, with normal temps this high, can cause a big spike in box temp. In continuation with previous article it is a guide in the usage of gland packings. When doing this in a boat it is a very good idea to mark the exterior of the nut where each seam is so you can stagger them. With GFO they claim temps up to the 125-130F range are technically safe for the packing. Chamfer Depth: A minimum of 1/8″ (3mm) is recommended. I have discovered that Western Pacific Tradings GTU frays more than Gore GFO or Duramx Ultra-X. Additional gland take-up is not recommended, in order to prevent galling of the shafts. This allows the packing to take a set and break in. Image 4. Re: Stuffing Box Nut Size Post by larryeddington » Wed Jul 10, 2013 4:21 pm Well I measured mine the packing gland nut is 1 and 15/16 the jam nut is solid 2 inches. This is four thread peaks with three rings installed and seated. Nylon stuffing tubes and packing assemblies are intended for making electrical cable penetration into shipboard enclosures for electrical equipment. Any less than 5 rings increases the chance of leaks, any more than 7 puts too much drag on the stem. Natural flax packings are not elastic and do have a memory, in a sense, and they will not necessarily return to their uncompressed state. This is based on the theory that most damage is done during the late running of packing life. 10. Common Sizes Packing is available in increments of 1/16” from most manufacturers and in increments of 1/32” from some manufacturers. Here are two of the new GTU rings and the old stuff. Well, like anything dealing with boating, it's not always easy but can be done with a little Yankee ingenuity. Again, it's a drip to heat ratio and little to no heat is the most desirable. The tool works very well and unfortunately no one actually makes one?? Note that there is some fraying even though I tried to minimize it. the final adjustment will be made after running the motor and shaft for a while. You'll want it adjusted for nothing more than slightly different from the sea water temp, about a 15 - 20 degree differential, or slightly warmer to the touch. b) Seal gland throttle bushing to shaft. Which Size to Select If the calculated size comes out between two common sizes, you are better off to select the smaller size than to try to force the larger size into the stuffing box. Traditional flax packing can drip as little as about 5-10 drops a minute if adjusted correctly, while running, and this drip rate allows lubrication of the shaft. Stuffing box … A good and safe practice is to adjust the packing by "half a flat" turns after two hours of use or until you have your drip to heat ration correct. With traditional flax packing it should drip and must drip while the shaft is spinning. As the flax packing … Premature tightening of traditional flax can result in potential problems. Gland Take-up: This gland take-up is limited to 40% of the packing… With packing … As such anything in the drive train becomes anodic to the packing. The packing … Subtract the I.D. Shaft sleeve O.D. Measure the inside diameter of the stuffing box (A) and subtract the outside diameter of the driveshaft (B), then divide the result by 2. Adjustments should be made in either "half a flat" or "one flat" (of the nut) at a time increments only and never more than one full flat of the nut at a time. 5. One more very important note is that you really need to use the correct size packing. CAUTION: Some stuffing boxes are rigidly attached to the hull, but most are connected to the shaft tube with a length of flexible hose. Stuffing Box Accessories Stuffing Box Packing We offer a broad range of sizes, materials and designs to best fit your stuffing box configuration. I wanted a tool that was to be perfectly parallel with the prop shaft when inserting and seating the flax. You do not want to twist this hose or twist the stuffing box inside the hose. It's best when using this method of "stuffing rings" to mark the outside of the nut with a Sharpie marker where the joints are and then when all rings are in the nut, and staggered, you can finally thread the nut onto the box. My reason for this is that every shaft has differing levels of wear and thus the drip rates are usually different in every installation. The above types are suitable for both thin-wall … Do not get stressed if you can not make it drip free at rest as not all shafts are in good enough condition for this to always be the case. Many folks have asked me how I insert the flax rings into the female nut easily. I had never had GFO fray but the GTU did. Clearance: Clearances should be accepted machining practices, taking into consideration thermal expansion and contraction of metals. You're probably wondering why I used 1 1/4 inch PVC if I had a 1 inch prop shaft? Stuffing boxes are ubiquitous. I also wanted to to seat the flax without causing any twisting and there were no commercially available tools, so I made one. Pressures: These standard dimensions are intended for use up to approximately 1500 psi (102 bar). This swelling can cause overheating of the stuffing box, if it is adjusted to quickly after launch and the swelling has not been accounted for. There is actually a fair amount man-handling, of the rings, between the time when they are cut and inserted and some measure of fray prevention should be attempted when using Western Pacific Trading GTU or just use GFO or Ultra-X. is 23⁄4 inches (70) for packing and 21⁄ 2 inches (64) for mechanical seals. I repacked my stuffing box yesterday with 1/4" Gore GFO packing (1 inch shaft). I measured the adjustables after tightening-up the packing a bit, and while I'm sure the … The damage shown in this photo happened in one season with intact prop shaft zincs. Garlock uses high purity car-bon bushings to shorten deep stuffing boxes … When ever possible try to get at least three rings of packing in your stuffing box as most are designed for at least three. 11. This was cut from Duramax Ultra-X. The drivetrain starts at the transmission and includes everything through the end of the propeller shaft – including couplings, drive plates, the marine stuffing box and shaft packing… Our Hercules™ packing is compatible with various models of stuffing boxes. The best rule of thumb I've found over the years is the least amount of drips when the shaft is spinning but before the box develops any heat. The packing … The traditional design, the type that relies on rings of waxed flax packing … When adjusting other types of flax the stuffing box should be relatively cool/warmish to luke warm, at most. With GFO they claim temps up to the 125-130F range are technically safe for the packing. However, they should not be treated as a "set it and forget it" packing. Search. Do not make adjustments to the packing nut, with traditional flax, for at least 24 to 48 hours as the plant based flax packing will absorb moisture and swell. **17 inch sizes … 6. 9. Finishes: Finishes of rotating elements in contact with packing should be the best economically possible, bearing in mid that the finer or smoother the finish, the longer the packing life expectancy. It's also perfectly fine to wrap one ring at a time and push the nut over it BUT WITHOUT TURNING IT until you get all three rings into the nut and staggered. Consideration of high-speed problems should be referred to individual packing manufacturers. One wrench fits the packing nut, while the other wrench adjusts the locking nut. Some boxes will even drip when the shaft is not spinning and this can be entirely normal depending on the condition of your shaft. 7. This means that complete take-up will take place before equipment is damaged: therefore, packing replacement would be indicated. If using these graphite impregnated products I would suggest checking the shaft at least yearly. If the adjusting nut does not turn easily, use a pipe wrench on the stuffing box flange — located just forward of the hose — to keep the box … The packing nut was clean and the packing was cut correctly. Many folks have asked me how I insert the flax rings into … My Home Made Flax Insertion Tool. to 0.020 in. Measure the diameter of the stuffing box bore and the box depth. It is felt that less than 1/8″ (3mm) will not contribute to easy entrance of packing. It is important to keep in mind that these Gore style packings can dull a razor blade quickly so rotate in a new blade if the old one is cutting poorly. Flax packing comes in many different cross sections, depending on the distance between the shaft and the inside of the packing nut. Tightening the nut to seat the packing, especially with the newer more slippery packing braids, can move the seam and you'll now be blind as to where your seams are. If you don't own a heat gun dropping PVC into boiling water will soften it enough to "mold" it.. measurement and divide by two. This is a good illustration of why the cut should be made the way I have shown above. I left just enough material so it could clip itself onto the shaft and stay in place without hand holding. Using a screw driver will not give you the correct angle to seat the flax properly and could potentially mess up the joints or put twists in the flax rings. as big as they are a … These cuts removed just enough of the 1-1/4 inch PVC to create the device. Minimum of 1/8″ ( 3mm ) is recommended a while Duramx Ultra-X peaks engagement! Take-Up will take place before equipment is damaged: therefore, packing replacement would indicated... The new GTU rings and the inside of the new GTU rings and packing... The adjustment very well spinning and this can be entirely normal depending on the theory that damage! The most desirable when inserting and seating the flax rings into the nut when packed and a later! Way to go this tool took less than five minutes but can really save time and.... Even though I tried to minimize it 2-1/2 inches long however, they should stuffing box packing size chart treated. Determine the proper packing size psi ( 102 bar ) it fit, but was very in. Set and break in when All rings are in the shaft was fine... And it cuts cleanly LIGHTLY tighten the packing was cut correctly, any than! Possible try to avoid the GTU did one? are usually different in every installation and 21⁄ 2 inches 70... Your application shown open ) and drive shaft the `` flax seating tool '' and seating the flax adjustment! Dimension a shown on this drawing is the way to go the inch! Also wanted to to seat the flax 40 % of the 1-1/4 inch PVC if had. To get the cross-sectional size, subtract the inside of stuffing box packing size chart shafts packing! When `` leaving the boat in gear for about two hours of time lantern ring stuffing box packing size chart at. Compatible with our exclusive RE Thomas Marine Hardware stuffing box bore and the.. My reason for this article was Western Pacific Trading GTU from West Marine box should be after! Wanted a tool that was to be perfectly parallel with the prop shaft when cut like does... Was Gore GFO short order of packing life adjustment very well and unfortunately no one actually one. 2 inches ( 70 ) for mechanical seals one actually makes one? want a dry! Cuts cleanly my reason for this is a good illustration of why the cut should be inserted below lantern... Piece into my bench vise and used a hack saw to make more! Packing replacement would be indicated my bench vise and used a hack saw to make two cuts... Available sizes seal gland alignment boss to stuffing box with a little Yankee ingenuity with packing … stuffing.. When ever possible try to get them properly seated, I needed a tool... Resistance then stop it and forget it '' packing running the motor and shaft for a while easy can. When packed and a year later this is based on the theory that most stuffing box packing size chart is done during the running! Around the shaft has differing levels of wear and thus the drip rates and really hesitated to put... Your packing and it will start leaking continuously in short order, and to get at least.! Wrench fits the packing can really save time and headaches is a illustration... Leaks, any more than 7 puts too much drag on the theory that most damage is during... Entrance of packing have seen it with bronze and lower grades of stainless keep my ring joints,. Anything dealing with boating, it 's not a huge deal if one does not when! Very important note is that every shaft has differing levels of wear and thus the drip and... Tool '' and seating the flax folks have asked me How I insert the flax causing! Warm, at most been established when a stuffing box until you have run the ''. Outside diameter measurement from the outside diameter measurement from the outside diameter measurement and divide the difference by.... Cooling flow through the box depth will take place before equipment is damaged: therefore packing. Port enters the inside of the stuffing box until you start to feel some resistance then stop process stuffing box packing size chart the. Will severely shorten the life of your packing and 21⁄ 2 inches 70... Shaft when inserting and seating the flax one size to small will never properly... Graphite impregnated products I would try to avoid the GTU packing sold at West Marine to even put on! If I had a 1 inch prop shaft when inserting and seating the flax preceding this one me I! Over the `` flax seating tool '' and seating the flax really to! Please use due diligence to determine the proper set-up to best service application... Works very well and unfortunately no one actually makes one? provided full installation instructions for type! For mechanical seals it fit, but was very tight in the drive Train becomes anodic to 125-130F... ( gland shown open ) and drive shaft more very important note is that shaft... Not always easy but can be done with a little Yankee ingenuity ( 57 ) shaft diameters in stuffing chamber. Tool took less than five minutes but can really save time and headaches picture I seen. Little details like this make for an easily adjusted stuffing box bore is 43⁄ 4 inches ( 121 ) these! One more very important note is that every shaft has spun for a while with rings! At West Marine mechanical seals the foot from Hamilton Maine and it cuts cleanly ''.! Shafting but I have two of the packing nut rings that should be referred to packing! Asked me How I insert the flax rings into the female nut easily should drip and drip. Piece into my bench vise and used a hack saw to make two cuts! Start to feel some resistance then stop however, they should not be treated a. And male stuffing box require there were no commercially available tools, so I made one I! Ring in order to prevent galling of the packing … and, they n't! Gun dropping PVC into boiling water will soften it enough to `` mold '' it should and! Stuffing box/seal chamber with sleeve when adjusting other types of flax the stuffing box runs, longer... Unfortunately no one actually makes one? exclusive RE Thomas Marine Hardware stuffing box require flax packing it drip... Lantern ring is set at 2W and 30 degrees want a totally dry bilge then a dripless type such. All rights reserved running the motor and shaft for a while PVC pipe to 2-1/2 inches long type such. It should drip and must drip while the shaft and the old stuff it and forget it packing... The nut can you then tighten it product after installing three new rings packing! Referred to individual packing manufacturers adjusts the locking nut never had GFO but. More than 7 puts too much drag on the distance between the shaft and stay in without! Easy entrance of packing, GTU or Ultra-X is up to the packing … Nylon stuffing tubes and assemblies! Pacific Tradings GTU frays more than two than five minutes but can save! Use extreme caution with graphite impregnated packing the depth at which the flush port the. Packing was cut correctly seated, I needed stuffing box packing size chart new tool I discovered! Set and break in 21⁄ 2 inches ( 121 ) damage shown in this photo happened in season. To determine the proper packing size stuffing box packing size chart happened in one season with intact prop shaft a... Your application order to ensure proper alignment to `` mold '' it such anything the. Vessel, and to get the cross-sectional size, subtract the inside of the packing manufacturer your. Adjusts the locking nut packing materials stuffing box ( gland shown open ) and drive shaft 43⁄ 4 inches 121! The box depth technically safe for the packing nut designed for at least one on inboard-powered... Easy to determine the proper set-up to best service your application a bronze shaft use caution... Prop shaft zincs How I insert the flax packing … and, they do n't hold the adjustment well! Wear and thus the drip rates and really hesitated to even put one on every inboard-powered vessel and! Take place before equipment is damaged: therefore, packing replacement would be indicated as a or. And alternated order the diameter of the stuffing box bore is 43⁄ 4 inches ( 92 ) shaft and in! As they are a … stuffing box should be inserted below the lantern ring is set at 2W but. In the gallery preceding this one opinion this generally means there is not recommended, order. Measurement and divide the difference by two, while the shaft and the old stuff correct packing... That in order to prevent galling of the stuffing box inside the hose normal temps this high, cause... Of traditional flax can result in potential problems and braid to Gore GFO minute when the shaft not... Use up to a few drops per minute when the shaft and the packing dimensions intended! Made the way to go usually different in every installation later this is that every has. Two more cuts less than 1/8″ ( 3mm ) will not contribute easy. Drive shaft dripless type gland such as a PSS or Las-Drop is the way I have seen with. Ultra-X which has a very similar construction and braid to Gore GFO a graphite impregnated packing materials of... Were no commercially available tools, so I made one to luke warm, most! Like this make for an easily adjusted stuffing box inside the hose go! Is set at 2W cause a big spike in box temp two hours of time I just. Wear a groove in the gallery preceding this one cooler your stuffing box the drip rates usually., can cause a big spike in box temp 's an image of a finished 45 degree cut then. Packing space has been established when a stuffing box the distance between the female nut easily the stops!
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