Although gland or packing seals have been the default sealing method of choice for many years, mechanical seals provide many operational benefits and should also be considered. The packing is inside the gland nut and creates the seal. The gland collar is in effect an external lantern ring. Excessive leakage during the first hour of operation will result in a better packing job over a longer period of time. Therefore, it is of the utmost importance to select the highest quality. Aesseal offers a selected range of gland packing that have been specifically designed and manufactured. A special lubricator with an oil reservoir mounted above the stuffing box provides a continuous lubrication on the polished rod in such situations. Product bulletin slidingstem packing selection december. They are inserted into the pump as cut rings between the rotating member and the body of the pump casing, valve, or other asset. 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. If it is round, a greater gland pressure is required to carry out the sealing process thereby causing higher mechanical stress. It is designed to be used in extremely corrosive conditions. For many water pumps gland packing is used to prevent any leakage from the shaft of the pump. The initial cost of gland pump packing is low when compared to the costs associated with mechanical seal.
Mencom cable glands are easy to use and provide a good strain relief and water tight seal for round cables. Dualpac 2212 gives users peace of mind in the toughest sealing applications. Vulcan vt9d is solely manufactured from pure ptfe in the form of fine multifilament yarns. They are designed to provide a seal between a moving spindle or shaft and the pressurised housing that it penetrates. They have excellent chemical resistance to strong acids and alkalis. 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. Stock service vulcan keep a comprehensive range of packing types and sizes in stock, in both imperial and metric sizes. A dry packing can easily burn, and the stuffing box will leak profusely. A compression packing seal is established by installing 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.
It will also have packing nut threads or a gland nut. 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. Gland packing acts as a protective sleeve over a cable or for piping in applications where pressure or other factors pose as a threat. Vulcan mechanical gland packings sealing solutions. Be sure not to scratch the packing bore in the body or the stem, any scratches could cause a leak. The importance of packing glands correctly cannot be overemphasised. Gland packing rex ri 9 ptfe fiber packing manufacturer. Packing for centrifugal pumps packing in a pump is intended primarily to restrict leakage around the shaft. Sealing systems for pumpssealing systems for pumps part i presented by. Brass indoor gland suitable for single wire armored, plastic or rubber sheathed cable.
Packing can be replaced without removal of the operator in most cases. Gland and valve packings are compression packing elements used for valves and pumps. Upon completion of this lesson, you should know andor be able to do the following. Garlock compression packing products will contribute to.
Read on for a basic understanding of mechanical seals, and how they differ from packing. Compression packing is one of the oldest and most common seal technologies. 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. 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.
In situations involving little or no motion relative to the seal, the oring application is static. This type of packing is a soft pliant and resilient material that is inserted into an annular space, gland or stuffing box to seal a rotary, reciprocating or static device such as a pump or valve. But still, gland packings are used in many applications such as fire water pumps, effluent water pumps. Packings are constructed of relatively soft materials. Gland packings are made from specially selected polytetrafluoroethylene. Compression packing products were once used to seal visible leakage in valves and control leakage in pumps.
A good packing for control valves, pumps handling corrosive gases, ammonia, foodstuffs and pharmaceuticals. Well, there are eight main types of gland packing that we carry and each should be used in different situations. Mechanical seals vs gland packing mechanical engineering. Types of stuffing boxes standard suitable for most applications, this type is furnished as standard. Packing selection guidelines for fisher slidingstem valves this bulletin provides information and insight to help you select fisher packing systems properly.
It is important to note that these guidelines were developed based on. 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. At acrylic impregnated with ptfe subpensiod and inert lubricant. Mechanical seals can save maintenance people an immense amount of time and money, but only if theyre installed correctly and properly cared for.
Due to high tensile strength of the fibre, this packing is best suited to be used in high pressure valves and reciprocating pump application. Here is a comparison between gland packing and mechanical seals, and how you can decide which one is right for you. This article is a guide to the use of gland packings and discusses the need of gland packings, the different field of applications, comparison between the gland packings and mechanical seals, advantages of gland packings over mechanical seals, properties of good gland packings, the different type of gland packings used, required conditions to a successful gland packing change job, and lantern. 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. It is an ideal packing for sealing dryers, mixers and agitators. Uk stocks are held in 8 metre boxes as standard, with some lower cost styles. Vulcan type vg2 is an exceptional performance and cost general. The packing solution for diverse sealing needs www. 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. Selection and replacement of packing what is in this lesson. The eight types of gland packing pump solutions australasia. Difference between mechanical seal and gland packing. All squarebraided sealrite limited gland packing is made using the most advanced braiding machines and materials available to maximise packing service life and performance.
When we use gland packings and when we use mechanical seal. Vulcan type vg2 is an exceptional performance and cost effective general purpose packing suitable for most. The shaft is wrapped by the packing and put in the gland nut. For the sealing of installations and equipment in the chemical, pharmaceutical, food processing, oil. 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. Although mechanical seals had been around for many decades and now it replaced gland packing in many application.
Find product details quickly blue tabs on each right hand page show the chapter or product table number. Recommended for valves handling fluids with entrained solids and. 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. Sealing systems for pumpssealing systems for pumps part i. 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. A gland along the top packing ring is tightened, and the packing is then compressed onto the stuffing box. If the size you require does not appear, please consult our customer support centre or your local james walker company for a quotation. This packing is best suited to seal glands of pumps, valves handling condensates, demineralised water and for cold and hot hydraulic applications. The ptfe yarns are further vacuum impregnated with ptfe dispersion to enable the packing to handle steam and gas services as well as liquids.
Pump and valve packing comes in different types for different applications such as twisted packing which is used where packing space is small and is. In this article, we will see the difference between the mechanical seal and gland packing mechanical seals vs gland packing. In situations involving reciprocating, rotating, or oscillating motion relative to the seal, the oring application is. The gland packing is a contacttype sealing element.
The cable glands are rated up to ip 68 comparable to nema 6p. The garlock compression packing facility is committed to supplying the highest quality engineered products to industry throughout the world. The gland is good handling in use with different types of cable whether plastic, rubber, metal or any other. Which type of packing should you use for any given type of pump. As the packing wears out, more and more adjustments are needed to the gland, which in turn causes further mechanical stress on the packing, resulting in reduced. If the packing braid is loose, it will be less durable. 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. 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. 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.
There are two types of packing, the antiextrusion rings and the stem packing. Purging type lantern gland and a pipe connection can provide purging of deposits around valve shaft. Vulcan offer an extensive range of 20 gland packing types with a vast variety of materials and constructions to suit a wide range of industry applications. You can remove this with a small scribe or dental pick.
Gland packing gland packing for all types of mechanical. Through advancements in materials, design and technology, garlock is now able to seal the most difficult fugitive emissions and eliminate pump leakage entirely. Sealrite limited offer an extensive range of gland packing types with a vast variety of materials and constructions to suit a wide range of industry applications. Normally, oil produced in the well stream lubricates the sealing surfaces, but intermittent pumping or a heading fluid production can result in the drying out of the packing. Stuffing box design and installation of compression packings. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. With the packing gland removed you can now begin removing the packing.
Chapter 8 contains the product index page 352 sorted by the profiles. Prior to sizing your seals, please check the condition of the rod, gland, housing, etc. The following application guidelines have been developed to aid in the packing selection process. Aesseal offers a selected range of gland packing that have been specifically designed and. Spring tension is most essential on other types of spring loaded packing, buton the packing illustrated above the spring is not depended on as the water pressuredoes the sealing of the. A guide to gland packing, selection of gland packing.
Safe nit t pessafeunit types sfp packing or single seal flushsingle seal flush sfq quench seals sfd dblsldouble seals. If you continue browsing the site, you agree to the use of cookies on this website. Correctly adjusted gland packing should be maintained with a leakage rate of approximately 1drop per minute of sealed product per inch25mm of outside diameter of shaft. Thinking of making the switch from conventional packing to mechanical seals.
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