Maintenance crew inserted back the seal setting plate and with the help of filler gauge on both sides increased the spring compression … While researching several mechanical seal manufacturers to gain some insight as to what their tolerances were (they are specific to configuration and are provided with the mechanical seal), I ran across the following very good article on mechanical seal basics. The first dry gas seal for a compressor was patented by Kaydon Ring & Seal in 1951 when it was known as Koppers Corporation. Mechanical seals dependent on the direction of rotation are all those . “I was so impressed with the people, passion, and products of VibrAlign. pp 161-194 | Mechanical spring … Terms of Use Multiple Spring Mechanical Seals: Mechanical Seals for Pump shafts provide the best possible seal for a rotating shaft. 5. A mechanical seal has 4 main sealing points: I. Mac was a Journeyman Millwright at a Kimberly-Clark paper mill in Washington State before moving into a Maintenance Team Leader position. This will determine the seal size diameter - which is either the shaft size or the sleeve size that the seal fits over. Remove the spring retaining clips and recheck for seal alignment to the scribe mark. The decision to choose between a double or single seal comes down to the initial cost to purchase the seal vs. the cost of operation, maintenance and downtime caused by the seal, plus the environmental and user plant emission standards for leakage from the seal. IV. A mechanical seal has 4 main sealing points (indicated by orange circles as per Figure 3): I. Understanding how they work will help the readers select the appropriate type for their application. BACK TO BASICS: MECHANICAL SEALS EXPLAINED. After completing a recent training class, I had opportunity to ask our customer what were some of the highest cost failures they experienced. 192.185.81.202. Thermal degradation of Mechanical Seal … M-D Building Products 87783 Compression Weather Stripping with Aluminum Stop, 36-by-84 Inches, Bronze Frost King M13WH V-Seal Weather-Strip 7/8-Inch by 17-Feet White, 7/8" x 17' V Seal Weather Stripping White, 1/2 Inch Wide X 19 Feet Long, Self-Adhesive PU Foam Door Frame Seal … Many early mechanical seal designs placed the spring inside the process fluid. Cite as. distance from the gland gasket to the top of the seal. This begs for a better understanding of this seal type and its application. The advantages are that this seal configuration eliminates the requirement for seal setting measurements at installation. Cartridge seals lower maintenance costs and reduce seal setting errors. There is a minor mechanical seal leak (Mechanical seal practically should have zero leak) 2. Metal parts must be corrosion resistant, usually plated steel, bronze, stainless steel, or Hastelloy. We also have more detailed information on mechanical seals and … In fact, there is leakage between these faces but it is minute and appears as a vapor. Because mechanical shaft seal failures are the number one cause of pump downtime, we decided to dedicate this column to mechanical seal basics. They are types of mechanical springs that can be used in valves, suspensions, ball point pens, on shafts, in a round hole or anywhere a pushing or compressing force needs to be applied. Not affiliated To address these situations, the seal industry has developed configurations which incorporate two sets of sealing faces, with a clean barrier fluid injected between these two sets of seal faces. Stationary component; commonly referred to as the seat. Single spring mechanical seals for centrifugal pumps consist of two very flat faces, one rotating (dynamic) and one stationary (static), that slide against each other to form a seal; these faces are pressed together by a spring. A mechanical seal consists of 2 principle components. This flatness minimizes leakage to a degree where it is essentially negligible. Unable to display preview. This is where Mac was first introduced to VibrAlign. ], Privacy Policy | The double seal life is virtually unaffected by process upset conditions during pump operation. Through a process of elimination, match the types and measurement gathered in steps 1 – 5 to determine mechanical seal … Over time, clogging of the sprin… The seal between the stationary member (1) and stuffing box face, i.e. Spring-Loaded Rotary Shaft Seals Also known as oil seals, use these to retain oil on rotating shafts in … On the back side of the "seal head" (the end which fits towards the "spring"), measure the inside diameter. Double seals, or clear liquid flushing from an external source, allow the use of mechanical seals on these difficult liquids. If you have any questions please contact us at: E-mail about your mechanical seals … The design, arrangement and materials of construction are essentially determined by the pressure, temperature, speed of rotation and product being sealed (the product media). By way of example, a simple mechanical seal design has 7 components (Fig 3): 1. Elastomeric bellows seals are commonly used for water applications. Then came the development of the “mechanical seal,” which accomplishes the job of restraining product leakage around the pump shaft with two very flat surfaces (one stationary and one rotating). insufficient compression will result in leakage. n which the transmission torque is directed via a conical spring (torque transmission). The functional categories of a mechanical seal are: 1. Measure both seal heads and spring x 0.5 = OP HT * Please note: Do not include seat height measurements. Typically: Mechanical seals are installed onto a rotating shaft and designed to prevent visual leakage Two highly polished, spring-loaded 'seal faces' come in contact with one another One of the sealing faces is stationary while the other sealing face is rotating along with the pump shaft Each of the two sealing faces are sealed … Mating faces must also resist corrosion and wear. Assemble the mechanical seal into the pump and tighten, checking for alignment with the scribed mark, as in Step 2. However, because of the delicate components used for this new sealing method, mechanical seal failures are the greatest cause of pump down time. Years ago, most pump shafts were sealed using rings of soft packing, compressed by a packing gland, but this type of shaft seal required a fair amount of leakage just to lubricate the packing and keep it cool. This process is experimental and the … These keywords were added by machine and not by the authors. Even though these mechanical seal faces also require some (very small) leakage across the faces, to form a hydrodynamic film, this leakage normally evaporates and is not noticeable. Spring compression is inadequate because of incorrect installation. These seals have a metal case that creates a tight seal when mating with smooth surfaces. The seal type and arrangement selected must meet the desired reliability, life cycle costs, and emission standards for the pump application. II. This is known as the primary seal. Gasket (2). Can small deposits of solids form ahead of the secondary sealing member? 1. mechanical seals SETTING MECHANICAL SEALS FERP CARRARA SpA via Provinciale, 1/E - 25030 ADRO (Bs) Italy - Tel. The seal between the gland plate and stuffing box, this is usually a gasket, or o -ring. Mechanical seals are leakage control devices, which are found on rotating equipment such as pumps and mixers to prevent the leakage of liquids and gases from escaping into the environment. This service is more advanced with JavaScript available, Centrifugal Pumps Characteristics of the Liquid:  Abrasive liquids create excessive wear and shorten seal life. Mechanical Seal Seal Pressure Angular Misalignment Compression Unit Face Loading These keywords were added by machine and not by the authors. The seal between the rotating (3) and stationary faces (1). Single seals do not always meet the shaft sealing requirements of today’s pumps, due to the small amount of required leakage when handling toxic or hazardous liquids; suspended abrasives or corrosives in the pumpage getting between the seal faces and causing premature wear; and/or the potential for dry operation of the seal faces. This primary seal is the basis of a mechanical seal design, and is what makes it work. 7) Determine the amount of compression on the seal: a) Mechanical seals with multiple springs that are less than 2” in diameter require 1/8” compression. Most products (process fluids) that are sealed are not very clean. CARTRIDGE SEALS have the mechanical seal pre-mounted on a sleeve (including the gland). Solids in the stuffing box, gasket protrusion or other foreign material restrict the motion of the dynamic seal ring. When the spring mechanism of the mechanical seal is immersed in this unclean fluid, dirt collects between the springs. The primary disadvantage is the higher cost, plus in some cases they will not fit into existing stuffing box/seal housings. Double seals and double gas barrier seals are becoming the seals of choice. Pre-assemble the mechanical seal as required. The features of this seal arrangement are: The other multiple seal configuration is called a Tandem (dual unpressurized) arrangement, where the two individual seals are positioned in the same direction. Any questions please contact us at: E-mail about your mechanical seals and double gas barrier seals are commonly in! The number one cause of pump downtime, we decided to dedicate this column to mechanical seal as.. For water applications of O-rings or other suitable gaskets amounts of pumped fluid is a minor seal... Javascript available, centrifugal pumps pp 161-194 | Cite as to make up travel. High percentage of mechanical seal practically should have zero leak ) 2 introduced to VibrAlign centrifugal pumps 161-194.... spring compression ( usually ) provides initial face pressure inside sales staff at 714-361-1435 cartridge lower! And arrangement selected must meet the desired reliability, life cycle costs, and tandem configurations sleeve. 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