The stuffing box is installed just above the pumping tee, its purpose being to prevent the leakage of well fluids into the atmosphere around the polished rod. Stuffing box design and installation of compression packings. The low flow stuffing box is made with tungsten carbide coated j221 shaft sleeves. Designed to eliminate the need for a pumping tee on the well, this single pack sbc box is available in 2. B4a stuffing box packing a typical packed stuffing box arrangement is shown in fig. We offer classic, highperformance, pollutioncontrol, hightemperature products, and accessories. The purging medium flowrate shall be continuously controlled. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. It is dependent upon the location of the stuffing box relative to the area where the impeller is turning, and the pump and impeller design. A depth dimension of 5w is used where lantern gland is omitted. Today, this tradition continues with new designs that set even higher standards for quality and dependability. A stuffing box design and installation of compression packings the importance of packing glands correctly cannot be overemphasised. Marine stuffing box what is its importance on a ship. Stuffing box is a sealing gland, having numerous applications on a ship.
Sealing systems for pumpssealing systems for pumps part ii presented by. An experimentalnumerical procedure for stuffing box packing. The unit needs to be taken out of service and repacked with new packing. Im looking for the design of stuffing box suitable for propeller shaft from 3 up to 8. 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.
Characterization and modelling of packedstuffing boxes. 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, or marine shaft seal, the. The design shall allow for the headshaft to couple above the stuffing box. Stuffing box assembly drawing,online education youtube. Primary packing can be changed under pressure by tightening compression bolts. These characteristics are defined and the testing procedures for their experimental. It is used to prevent leakage of fluid, such as water or steam, between sliding or turning parts of machine elements. Therefore the sealing element stuffing box with packing is of great importance. Assembly and details machine drawing pdf slideshare. For some pumps, the stuffing box pressure is the same as the pump suction pressure. This results in a more efficient, and therefore less costly, use of plant air and electricity in controlling actuated valves. Harry labour, the inventor of the self priming pump, was very proud of the stuffing box design see picture that has proven to be troublefree with a minimum of maintenance. Feb 2000 the plain vane type impeller exhibits better wear life characteristics in very coarse slurry applications or where the mould design precludes the francis type where an elastomer impeller is required.
Everybody know that stuffing box is a important mechanical device, which is used to prevent oil leakage in engine, in this design first time i try drawing section in fusion 360. A standard depth of 7w or 7 times the packing space has been established when a lantern gland is used. Since mechanical seals are subject to stuffing box pressure, this pressure is utilized to achieve and maintain seal face closure in a nonbalanced seal. When sealing water is taken from the pump discharge, an external connection may be. Donts to ensure safe operating procedures, follow safety rules, practice proper maintenance and use common sense. Each cad and any associated text, image or data is in no way sponsored by or affiliated with any company, organization or realworld item, product, or good it may purport to portray. When centrifugal pumps were developed there was a need to prevent the pumpage from pouring out thru the open clearance between the pump casing back and the rotating shaft, which turns the impeller. New product auto lubricatorstuffing box auto lubrication.
Like evsp, quickset offers less than 100 ppm service and exceptionally long life. Oct 29, 2016 a stuffing box is an assembly which is used to house a gland seal. Packed stuffingboxes are mechanical sealing systems that are extensively used in pressurized equipment such as valves and pumps. The impeller 8 is mounted on the pump shaft 5 with roller bearings 7 in either overhung or center hung arrangement. This can be designed, if necessary, as a double seal with buffering medium. Proper behavior of the stuffing box is ensured by a continuous purging steam, n2, plant air. An experimentalnumerical procedure for stuffing box. Each ring must be seated prior to the installation of the next ring. Overtightening the packing nut so that the stuffing box drips no water at all can wear a groove in the prop shaft and ruin it. Shelby scottshelby scott western region john crane incjohn crane, inc. Pdf packed stuffingboxes are mechanical sealing systems that are.
There is the need for additional equipment in the form of a grease pump. Dec 02, 2010 however, the modeling of the packed stuffing box requires the knowledge of other packing seal mechanical characteristics such as compression modulus and poissons ratio. Solid bronze stuffing boxes designed with extrathick ribs spaced at 90 for maximum rigidity and a heavy rectangular mounting flange. Stuffingbox valve, sealing performance, micro and nano fluids in porous media. When you hear stuffing it usually means stuffing for turkeys, it may also suggest some misconceptions about stuffing boxes for pumps. 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. The pressure in the pump stuffing box must be known before the proper seal and flush system can be selected. The extended male pilot mates with the shaft log to insure alignment. The stuffing box additionally features close clearance split lantern restrictors with a harder nongalling coated inside diameter. The garlock compression packing facility is committed to supplying the highest quality engineered products to industry throughout the world.
A variety of formulas exist to establish the number of times a stuffing box should drip while the shaft is spinning. A general type of the stuffing box is the gland, which is used to shut rotating or reciprocating shafts. When the shaft is spinning, the stuffing box must allow a few drops of water per minute for lubrication. Original design with unique misalignment feature reduces need for precise alignment with the pumping unit. Stuffing, stacking and lashing containers there are three main categories of damage to cargo shipped by container. In many small fiberglass boats, for example, the stuffing box is mounted inboard near the point the shaft exits the hull. The following steps have been devised to ensure effective installation of. The stuffing box is a comparably simple and extremely robust shaft seal for witte gear pumps. Can someone kindly help me on where i can find the sizing table for the waterlubricated stuffing box as given in the attached file.
Solidworks stuffing box assembly design complete tutorial. The importance of packing glands correctly cannot be overemphasised. The impeller discharges radially into the volute or diffuser 11, which is built into the pump casing. Guidelines for stuffing box dimensions industrial resource. Stuffing box designsincluding the standard nonlubricated types and various lubrication and bleedoff schemes to minimize leakage and extend. A braided packing made of expanded pure graphite with textile fiber is normally used. Aug 21, 2009 can someone kindly help me on where i can find the sizing table for the waterlubricated stuffing box as given in the attached file. Goulds 3196 4 open impeller enclosedtype impeller fully open impeller two times more wear area longer life, reduced repair costs the most critical wear areas of a pump are the casing and stuffing box seal chamber clearances. The new design has proven to be very reliable and is now in production. If the gland follower is not long enough to reach the bottom of the stuffing box, a tamping tool or an extension. Many packing failures are due to incorrect installation of the packing. In this example, the nameplate shows a series e1510, size 5gb in stainless steel fitted ssf construction. The pressure in the stuffing box is not dependent on the clearance at the throat. Of course, the number of rings of packing will depend on the design of the stuffing box, and that will determine how to pack your pump, bryant said.
Please feel free to contact applications engineering should you require anything further. Goulds provides the best choice of stuffing box or seal chamber and a wide range of. It is kind of a packing material used to seal pump, valve, sterntubes etc. An excess of flow could damage the stem or the internals. The following steps have been devised to ensure effective installation of packings on pumps and valves. A gland is a general type of stuffing box, used to seal a rotating or reciprocating shaft against a fluid. The safety measure from the carriers point of view, therefore, should be. Giw offers two types of stuffing boxes as well as replacement parts for a third type, which makes choosing the proper lantern rings and packing of utmost importance. Regular inverted stuffing box ivsb owest profile design l ideal for smaller pumping units. The gland is commonly used at the head of a tap where it is packed with a string soaked in grease. Unlike evsp however, quickset provides low emissions benefits with approximately 20% less stem friction. Bearing lockwasher, bearing locknut and coupler end bearing cap not shown used on extra large bearing assembly only. The exact value depends on the fluid, flowrate, design and condition of the pump.
In this paper, the mechanical characteristics of packing seals are obtained using a hybrid experimentalnumerical procedure. A stuffing box is a seal that is used to prevent fluids and gases from leaking between the turning or sliding parts of the machine elements. Split design for ease of installation because of the excessive weight, stuffing boxes larger than 15 are only built in split design. Characteristics of packings for stuffing boxes for the. Garlock packing is designed to give the user the greatest return on initial investment in terms of leakage control, service life, and dependable, costeffective product. A diaphragm seal prevents leakage when the pump is not operating. Common sizes packing is available in increments of 116 from most manufacturers and in increments of 2 from some manufacturers. Goulds 3196 4 open impeller enclosedtype impeller fully open impeller two times more wear area longer life, reduced repair costs the most critical wear areas of a pump are the casing and stuffing boxseal chamber clearances. The pump nameplate identifies the pump by pipe size, pump construction and impeller diameter as shown above. Understand the purpose, principle of operation and field of application of the given machine. Classic stuffing boxes lowest profile design ideal for smaller pumping units furnished with three top cones and one bottom cone one top cone thin cone can be removed to reduce overall height even further. For a suitable design of valves distinct characteristics of packings for stuffing boxes are required, describing the deformation, relaxation, friction, and tightness behaviour. Stuffing box design and installation of compression packings the importance of packing glands correctly cannot be overemphasised. The consignee receives the container with a broken seal.
Oct 06, 2016 assembly and details machine drawing pdf 1. This same commitment is reflected by our people, dedicated to the sale and. Jun 15, 2017 stuffing box assembly drawing,online education 4b engineers. The number of impeller vanes usually varies between three and six depending on the.
Hercules stuffing boxes are available for polished rods and liners 1 through 4 with lp or tubing threads through 412 eue. The stuffing box functions as a line wiper, keeping any excess grease extruding from the top of the flow tube from escaping. Strictly, the term stuffing box is related to the packed box shaft seal, long the principal device used to seal a pumps casing where the shaft passes through it. Most widelyused stuffing box in the industry primary packing can be changed under pressure by tightening compression bolts unique misaligning feature reduces need for exact alignment with the pumping unit adaptable to many accessories standard model has lug with grease zerk optional org and apa control device. See page 6 for exploded view of 8g bearing frame assembly. Fundamentals of chiller plant design daikin applied. Pdf stress analysis of packed stuffingboxes researchgate. Dimension a shown on this drawing is the total depth of packing including lantern gland. A split box at these sizes offers obvious installation and service advantages when working in confined quarters.
Gland and stuffing box autocad 2014 3d machine drawing. It is also used in boats, where the propeller shaft it protrudes out of the hull. Apr 21, 2017 conventional wisdom dictates that stuffing box hoses should be preemptively replaced approximately every five years or sooner if warranted. Sealing systems for pumpssealing systems for pumps part i. A repeller between the stuffing box cover and impeller pumps liquid from the stuffing box while the pump is running. Any size and model johnson cutless heavyduty stuffing box can be custom split.
However, the modeling of the packed stuffing box requires the knowledge of other packing seal mechanical characteristics such as compression modulus and poissons ratio. Design features material composition includes nitrile elastomer and cotton fabric specifically formulated to be compatible with oil and gas applications temperature capability. For installation of dieformed rings of flexible graphite, open each ring in a helix form to prevent breaking. Harry labour, the inventor of the self priming pump, was very proud of the stuffing box design see picture that has proven to be troublefree with a minimum of. A common type of stuffing box is illustrated in fig.
Home up 1786 marine stuffing box 1787 marine stuffing box 1788 marine stuffing box 1789 marine stuffing box 1790 marine stuffing box 1790m marine stuffing box 1791 marine stuffing box marine dutchman air seal ring marine stuffing box packing how to install a stuffing box how does a marine. Stuffing boxes our range of hercules stuffing boxes provides a superior seal against different types of applications. The box is a cylindrical assembly, typically of bronze, comprising a sleeve threaded on one end to accept adjusting and locking nuts. If stuffing box pressure is very high, typically over 100psi. The upgraded materials and design can reduce gland water consumption up to 50% compared to previous warman mcr pump designs. The 3180 is easily field converted to dynamic seal with retrofit parts backplate, stuffing box cover, repeller, sleeve. Parts list cp206,pl series 1510 stuffing box design series 1510 pump bearing frame selection chart box type t frame motors x for 1150 rpm or 1750 rpm applications xx for 3450 rpm applications used on 6g. Sarbs pump maintenance seminar, june 7, 2012 seal typesseal types. Insufficient flow can lead to catalyst buildup, and backflow.
A five rings of packing, b a lantern ring used for the injection of a lubricating andor flushing liquid, and c a gland to hold the packing and maintain the desired compression for a proper seal. Looking for stuffing boxes sizing table boat design net. Water injection hose must also be appropriately suited to the task. In such circumstances, the carrier may be held liable for damage andor loss to the cargo. The stuffing box prevents sea water from entering the boats hull. 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, or marine shaft seal, the flex couplings, the cutless bearing and more.
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