Text headings in each module are linked to and f\ rom the table of contents for that module. A guide to gland packing discusses the different uses of gland packings in the engine room, how to measure, cut, remove and insert the gland packing,their properties, selection, the need of lantern rings, the cautions and the precautions in the use of gland packing in engine room of a merchant ship. Stuffing box design and installation of compression packings. The dimensions a shown on the drawing below is the total depth of the packing including lantern gland. This portable document format \ pdf \ file contains bookmarks, thumbnails, and hyperlinks to help you navigate through the document. Well, there are eight main types of gland packing that we carry and each should be used in different situations. Any packing that is manufactured using smaller or obsolete braiding machines lack the strength of real crosslock construction, because they are more rounded in crosssection and not as dense. To avoid tearing or nicking, the use of oring lubrication is recommended while installing the oring into the dovetail gland.
It is important to note that these guidelines were developed based on. In this article, we will see the difference between the mechanical seal and gland packing mechanical seals vs gland packing. The style 77hs mould works with the style 99 series and is resistant to abrasion from materials like slurry. A guide to gland packing, selection of gland packing. Although mechanical seals had been around for many decades and now it replaced gland packing in many application.
A conventional internal lantern ring has the disadvantage that over time it will move deeper into the stuffing box and eventually block the grease or. Ptfe gland packing, non asbestos industrial packing, asbestos. This type of glands are used in dry indoor areas and used with all type of single wire armoured cables, plastic or rubber sheathed cables. A packing gland comprising a cylindrical shell having an annular inturned shoulder at one end, a retaining ring engaging said shoulder, an expander ring spaced therefrom, a plurality of packing rings interposed between the retainer and the expander ring, said packing rings being vshaped in cross section, a semiporous packing and water filter.
Dualpac 2212 gives users peace of mind in the toughest sealing applications. If it is round, a greater gland pressure is required to. Types of stuffing boxes standard suitable for most applications, this type is furnished as standard. Apr 15, 2016 for many water pumps gland packing is used to prevent any leakage from the shaft of the pump. Due to high tensile strength of the fibre, this packing is best suited to be used in high pressure valves and reciprocating pump application. For shafts of size 16 to 28 mm diameter the gland packing of size 8 mm is used. The ptfe yarns are further vacuum impregnated with ptfe dispersion to enable the packing to handle steam and gas services as well as liquids. If the packing braid is loose, it will be less durable. When we use gland packings and when we use mechanical seal. Packing selection guidelines for fisher slidingstem valves this bulletin provides information and insight to help you select fisher packing systems properly. One the other hand, the diaphragm becomes worn more easily and regular maintenance is necessary if the valve is used on a regular basis. Be sure not to scratch the packing bore in the body or the stem, any scratches could cause a leak. Compared with other types of shaft seals, they are adjustable and suitable for use with pressures and circumferential speeds higher than those radial shaft seal rings are used for see also shaft seal. Packing for centrifugal pumps packing in a pump is intended primarily to restrict leakage around the shaft.
Excessive leakage during the first hour of operation will result in a better packing job over a longer period of time. Gland packing acts as a protective sleeve over a cable or for piping in applications where pressure or other factors pose as a threat. Upon completion of this lesson, you should know andor be able to do the following. The garlock compression packing facility is committed to supplying the highest quality engineered products to industry throughout the world.
For shafts of size 30 to 46 mm diameter the gland packing of size 10 mm is used. Uk stocks are held in 8 metre boxes as standard, with some lower cost styles. This formulation creates a unique, longlasting packing that expands easily under gland load which keeps the packing internally loaded against the rotating member while, at the same time, resisting burning and shaft scoring. Sealing systems for pumpssealing systems for pumps part i. With the packing gland removed you can now begin removing the packing. A very deep double compartment gland is provided, which has room for six rings of packing in the main part of the stuffing box, followed by a gland collar which incorporates an annular space close to the shaft which can be greased or liquid sealed to prevent air entering the pump or liquid leaking from the pump. But generally the following sizes of the gland packings are recommended for the different shaft sizes as follows. Shaft or gland packing made from a series of braided fiber rings are used to form the seal between the shaft and the most common types of stuffing boxes. 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 wide variety of types packing gland options are available to you, such as nylon, brass, and ptfe.
Stock service vulcan keep a comprehensive range of packing types and sizes in stock, in both imperial and metric sizes. Chesterton offers extensive applications expertise in pump packing solutions for rotating equipmentincluding design, selection, installation, testing, and more. The cost of packing is low when compared to the cost of down time of a plant incorporating machinery wear, product loss, gland maintenance and labour. Take up gradually on the gland as the packing seats, until leakage is reduced to a tolerable level, preferably 810 drops per minute, per inch of shaft diameter. Waiting to replace packing in centrifugal pump service can lead to downtime and safety issues. These types of packings are supplied in square cross sections. Main page or subject heading 2 to order or get further details, please call your local contact shown on back cover or listed at.
Brass indoor gland suitable for single wire armored, plastic or rubber sheathed cable. May 29, 2017 according to me both could be use for rotary applications but gland packing wear out too fast that pump, pulp and paper or petrochemical industries cannot bear frequent maintenance of pump, mixers or agitators because it is not worthy to stop whol. A good packing for control valves, pumps handling corrosive gases, ammonia, foodstuffs and pharmaceuticals. Gland packing offering you a complete choice of products which include rex ri 9 ptfe fiber packing, rex ri 450 gfo gores ptfe graphite packing, rex ri 99 ptfe graphite gland packing, rex ri 27 pure aramid fiber packing, carbonaceous aramid fiber packing and synthetic ptfe fiber packing. Chesterton 1725a is a white, nonstaining, eptfe packing for use in food processing equipment including pumps, agitators and mixers. All the gland packing are a combination of the above mentioned basic materials and great research is done by the manufacturers to develop new and more efficient types of packing. Gland packing gland packing for all types of mechanical. But still, gland packings are used in many applications such as fire water pumps, effluent water pumps. Mechanical seals vs gland packing mechanical engineering site. Page 1 of 3 mechanical sealmixer application data sheet customer contact info company. For manufacturing gland packings asbestos is used with different combinations like graphite, brass metal, white metal, stainless steel wire etc. Gland packing is often used instead of a mechanical seal as packing is cost effective, easy to install and can be used in various types of products.
In situations involving reciprocating, rotating, or oscillating motion relative to the seal, the oring application is. Recommended for valves handling fluids with entrained solids and. Chesterton 329 is square plait braided to provide an unusually flexible, formable packing. It enhances the qualities of the packing to ensure fully that no leaks occur.
Traditionally, wax and other lubricants are used to impregnate the square crosssections of flax ropes. Designed for pump and valve service, this braid style uses specialty yarns braided on equipment where yarn strands pass over and under running in the same direction. Mar 24, 2019 the gland is good handling in use with different types of cable whether plastic, rubber, metal or any other. Rugged, easy to use and breakin, the 1730sc is designed for use in general service applications such as agitators, blenders, mixers, or any other applications that. Packing can be replaced without removal of the operator in most cases. Our innovative and awardwinning packing solutions reduce power requirements for the pump and result in less leakagelowering the total life cycle costs of the pumping system. Pump technology changes communities how to avoid compression. The modules listed in the overview are linked to the corresponding pages.
Which type of packing should you use for any given type of pump. The base fiber in sternlon is a longfibered, roved flax of the highest quality. It is intended to fill the annular space between the box and shaft so the packing may come as close as practical to the shaft or shaft sleeve without actually contacting it, and thus restrict the leakage. An acceptable replacement cycle time is heavily dependent on the application, the. Gland packing rex ri 9 ptfe fiber packing manufacturer from. The gland collar is in effect an external lantern ring. There are two types of packing, the antiextrusion rings and the stem packing. Selection and replacement of packing what is in this lesson. Long wearing fewer repackings exclusive chesterton ptfe pretreatment of separate fibers followed by a sacrificial lubricant after interbraiding, protects packing and sleeve at breakin, prolongs service life. The gland packing is a contacttype sealing element. To provide you with confidence in servicing your customers, the most common sizes and styles of our gland packing are stock guaranteed and available for same day despatch. Dec 11, 2017 in engineering industry gland packings play very important role. It is an ideal packing for sealing dryers, mixers and agitators.
The packing made of a combination of graphite, carbon, glass, etc. Two rings of packing in the outer part of the gland collar and a gland follower with 2 sets of compression springs complete the seal. Purging type lantern gland and a pipe connection can provide purging of deposits around valve shaft. While not essential, they are still extremely effective. The following application guidelines have been developed to aid in the packing selection process. In situations involving little or no motion relative to the seal, the oring application is static. Vulcan vt9d is solely manufactured from pure ptfe in the form of fine multifilament yarns. Product bulletin slidingstem packing selection december 2018. The eight types of gland packing pump solutions australasia. A depth of 5w is used when a lantern ring is not being used. Figure 1 dimensions in inches inches metric shaft range w shaft range w. The next type of packing materials are moulds that work in conjunction with gland packing. A procedure for determining the correct packing size and quantity.
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