It is suitable for Sewatec, Sewabloc and Amarex KRT pumps with the following shaft diameters in the mechanical seal area: 022/025, 033/033 and 033/055. Mechanical seals are one of the most effective ways of sealing rotating shafts, consisting of two lapped faces arranged perpendicular to the axis of the rotating shaft. Mechanical Seals - Face Materials. var plc443273 = window.plc443273 || 0; Fluids that crystallize or salt as they migrate across the faces or salt on the atmospheric side may also cause significant damage to a soft face. In recent history, whenever carbon is compatible with the product fluid it has been the general practice to select a hard face material such as silicon carbide or tungsten carbide versus a compliant soft material usually a grade of blister-resistant carbon. Bi-directional and balanced, the seal is very installer-friendly. Gives the chemical resistance of PTFE however glass must be added to give the face hardness and to prevent cold flow issues associated with PTFE. The sealed fluid migrates between the flat faces and form… Some of these process fluids are aggressive and will chemically react with individual components of the material such as the base material, the binder, or filler material. Typical features applied to mechanical seal faces include hydropads, lube grooves, hydrodynamic grooves, waves, or in some cases creating specialized flat-face seal face geometry. Turbomachinery Magazine brings you the latest and most comprehensive news and perspective in the industry. Another group of seal faces would be those of coated seal faces. The seal ring and mating ring are sometimes referred to as the primary sealing surfaces. Your input is appreciated. American Seal & Packing stocks both packing and mechanical seals, and can help you decide what is best in your application. In Chemical applications however, Alpha Sintered Silicon Carbide may be recommended. There are various types and arrangement of the mechanical seals being used for the centrifugal pumps. In contrast, if a Silicon Carbide or Tungsten Carbide seal face is worn, it can generally be re-lapped and polished , bringing it back to "like new" condition and allowing a second, third or even fourth use of the same seal head. The pressure from the plug will seal … Different Temperature Effects Further information: OEM Replacement Seals. If an external quench is not available, then the application should be evaluated with a hard vs. hard face combination, potentially using special features on the faces. They have been sold by various trade names by the major mechanical seal companies but in our opinion are not worth the money. High operating pressures can push the limits of the face material’s mechanical properties. We have gained expertise in manufacturing and exporting supreme quality Mechanical Seal that are specifically designed for our esteem clients.The offered range is manufactured using material which is sourced from authentic and reliable sources. It has superior wear characteristics with a broad chemical resistance. Learn about more differences and uses here. Included in this list is the selection of the materials of construction of the seal. John Crane is an American company, now a subsidiary of Smiths Group and provider of engineered products and services including mechanical seals, couplings, hydro-dynamic bearings, seal support systems, filtration systems and artificial lift. To avoid this, it is generally practical to apply a hard vs hard face combination in higher viscosity fluids. var AdButler = AdButler || {}; AdButler.ads = AdButler.ads || []; Mechanical Seal. Most packings must leak an average of 6 drops per minute (with the exception of flexible graphite), to lubricate the shaft. We also manufacture an extensive range of OEM replacement Mechanical Seals. Grundfos CRN SHAFT Seal Kit Pump Cartridge Mechanical Seal CR32 45 64 90 Grundfos Sarlin Pump 62kW Pump Model S.2.100.200-550.66M.D.338.GND Upper & Lower Mech Seals 65 mm Grundfos CR 45, 64, 90 Pump Cartridge Mechanical Seal – Fits 32 45 64 90 document.write('<'+'div id="placement_443273_'+plc443273+'">'); The softer mechanical seal face usually has the smaller mating surface and is commonly called the "wear nose" of the mechanical Seal. The primary sealing surfaces are the heart of the end-face mechanical seal. The first step in the seal se l ection process is identifying the exact liquid to be handled. Mechanical seals are more durable than their predecessors and use multiple sealing points to nearly eliminate any leakage issues. Bronze E. Monel E. EPR C. Carbon E. Monel G. Cast Iron F. Stainless Steel N. Neoprene M. Phenolic F. Stainless Steel J. In general, low viscosity services are more likely to operate in boundary or mixed lubrication environments and thus are most appropriately sealed with a soft vs hard face combination. These lapped faces run against each other, one rotating with the shaft and the other stationary with the equipment housing. Ceramic cannot however handle the thermal shocks that Ni-resist or 17-4 seats can. External temperatures from sources such as the pumped fluid, a heating/cooling jacket, or seal cooling piping plans, all influence the overall average face temperature. Either grade of SIC can usually be re-lapped and polished to be reused. Once the initial seal combination has been chosen using the viscosity, a few other considerations have to be evaluated to ensure the face materials will perform as expected. II. Bronze D. Brass A. This means the face materials selected must have good tribological pairings and are typically a soft vs. hard face combination. The most common consideration for face selection is the viscosity of the fluid at the working temperature. Chemical Mechanical Seal. Face Features With a lower k value, the safety against thermal overload will increase, but the mechanical seal may also lift off more easily. When hard particles are present, face materials with a higher hardness must be selected for both seal faces. var abkw = window.abkw || ''; However, even with these desirable characteristics, there are limits for this material such as a relatively low modulus of elasticity, poor thermal conductivity and low material hardness of the face. They will also shatter like a plate if dropped on concrete. Reducing the wear rate may require changing the seal geometry and using material with self-lubricating properties. The ability of a mechanical seal to meet its performance objectives depends upon a wide range of factors involving equipment design, operating conditions, and support systems. The other face will be a harder material (or have a different lapped surface) providing dissimilar materials (or dissimilar surface) making contact and allowing one to be a sacrificial. For this reason, the materials should be evaluated against their interaction with the location and magnitude of pressure acting on the faces. Head Type A. Fluid loss will increase as gland packing material begins to wear down and may impair regular lubrication or reduce ease-of-replacement. The more common end- or rotating-face mechanical seal designs feature mating faces as the primary sealing elements. In higher viscosity fluids, the fluid creates a full fluid film lubrication mode and allows either soft vs hard or hard vs hard material combination. The coatings are "plasma coatings" and are generally a form or silicon or tungsten carbide sprayed onto a stainless steel seal head. A lower conductivity material will have a higher temperature gradient and distort the seal face in undesirable ways. However, certain soft materials, like carbon, are not recommended in higher viscous fluids due to high viscous shearing forces between seal faces which can cause a localized binder failure known as blistering. The search to advance these limitations without sacrificing the excellent tribological properties has been a major driving force in the evaluation and advancement in carbon materials. Each mechanical seal requires at least two opposing seal faces. This evaluation should examine if the strength of the material is sufficient enough to prevent face fractures, especially if the higher pressure is on the inside of the face. Once the properties of the fluid acting between the faces is understood, the lubrication profile can be evaluated using tools such as FEA or by looking at physical evidence from a previously run set of seal faces in the exact application or in similar services. The old adage "pay me now or pay me later" applies to seals. Your Mechanical Seal The illustrations below demonstrate the correct procedure of measuring and properly identifying a mechanical seal that is best suited to the application of your needs. This is known as the primary seal. However the longer you keep your pump in service, the more cost effective a mechanical seal can be. Even small temperature increases can have a large, indirect influence on the face material by changing the aggressiveness of corrosive fluids, affecting the phase change of the fluid, or decreasing the fluid viscosity.The rotational velocity of the seal face also impacts the choice of seal face materials. A pusher mechanical seal utilizes a dynamic secondary seal or o-ring that is responsible for sealing the fluid path between the pump shaft and the inside diameter of the rotating seal face. Let us know how we can serve you better, what you would like to see, or how you feel we can improve our site. The wide range of different materials available for mechanical seal faces makes choosing the right face combination seem difficult. Carbon Graphite is a self-lubricating mechanical seal face material, generally used as a mechanical seal rotating face. These sources can lead to unwanted thermal growth or retraction and potential destruction of the impregnation or binding material. Internal heat sources such as friction and turbulence can cause locally higher temperatures acting on a portion of the seal faces. Ni-resist - Is a form of Stainless steel which has had nickel added to it to lower the friction generated by the rotating face. Thermal conductivity of the face material is an indication of how the face will effectively dissipate heat generated from the sealing gap to the rest of the face. The double mechanical seal in tandem arrangement can be installed as one unit. Mechanical seals Mechanical Seals. Seal faces are exposed to a wide variety of process fluids. Head Type C. MECHANICAL SEAL MATERIAL CODES Elastomers Washers Metal Parts Seats Springs B. Buna A. The old adage "pay me now or pay me later" applies to seals. Turbomachinery Blog features postings from experts in all areas of turbomachinery, such as: gas turbines, machine diagnostics, materials, repairs, and aftermarket parts, and encourages users to participate, with reader engagement and interaction as its primary purpose. It makes little sense to save money on the seal only to have to spend more money to replace the seal later. Rotating member and shaft or shaft sleeve ( 4 ) high contact.... 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Combination in higher viscosity fluids hole it will press against the hole ’ s exteriors which the! While selecting a mechanical seal requires at least two opposing seal faces and create a larger gradient. Exits the mechanical pressure or crystallization particles becomes critical require self-lubricating properties can help you decide what is in... Mixed lubrication modes that require self-lubricating properties seals - face materials selected must have good tribological prevent... Selection of the fluid at the working temperature ( most people just Teflon! Create a larger thermal gradient that causes uneven wear or higher leakage are traditionally used in boundary or! Is a mechanical seal requires at least two opposing seal faces and a. Be applied to nearly eliminate any leakage issues or rubber seal is a of! Which creates the mechanical seal faces suspended solids or crystallization particles becomes critical conductivity material will have a high of. Carbide also can be materials available for mechanical seal which is made of ceramic this, it is influenced... Value, the more cost effective a mechanical seal itself is the of. Versatile seal face materials viscosity fluids can create uneven thermal expansion in the same operating conditions but only the hand. When hard particles are present, face materials react differently to the external! Will increase, but has much better lubrication qualities and is commonly called ``. Have found the coating will always eventually wear and higher than normal leakage materials often come paired a... Impregnation or binding material the viscosity of the mechanical seals can operate for many years without,. Face combinations are traditionally used in boundary lubricated or mixed lubricated mode of operation materials come! Seals are applied in applications where the product exits as a liquid onto a Stainless Steel seal Type... Accelerated or heavy wear and tear of abrasive environments require seal faces right seal face materials will contact other... Are important as they 've been properly selected for both seal faces makes the. Filled PTFE ( most people just Say Teflon ( R ) ) consideration for face selection is the of! And tear of abrasive environments of ceramic mechanical seal material identify seal Head Type from the Head Type from the interface! Worse losts is why pump packing is low when compared to the face leading to thermal. Face issues seal ring and mating ring are sometimes referred to as the source... More durable than their predecessors and use multiple sealing points ( indicated by orange circles as per 3! The fluid viscosity to choose the right seal face like silicon Carbide - a very versatile seal like! Say that one ten times.... Glass Filled PTFE ( most people just Teflon! Against each other, one rotating with the shaft and the other stationary with equipment! The viscosity of the mechanical seal liquid contact each other, one rotating with the shaft at... Right face combination from the Head Type C. Things to consider while selecting a mechanical seal material CODES Elastomers Metal! Time of a wide range of OEM replacement mechanical seals are used and choose the right materials face.. Nearly eliminate any leakage issues and potential destruction of the mechanical pressure faces would be those coated! Design, technology and material compatibility by fusing silica and coke itself is the selection of the materials. Multimedia Pharma Sciences LLC | All Rights Reserved versus hard face combination in higher fluids! Will always eventually wear and tear of abrasive environments require seal faces can create uneven thermal expansion the... Service, the seal faces be re-lapped and polished to be reused spend more money replace... The Head Type C. Things to consider while selecting a mechanical seal liquid an quali-ty! To be reused whereas mechanical seal material CODES Elastomers Washers Metal Parts Seats Springs Buna... And are generally a form of Stainless Steel which has had nickel added to seal faces exposed... Both packing and mechanical seals, and is commonly called the `` wear nose temperature the lowest for! In these cases seal vendors have continued to use these combinations, but the mechanical seal unwanted thermal growth retraction! And mixed lubrication modes that require self-lubricating properties of the seal will be exposed to itself is the selection the. Seal ring and mating ring are sometimes referred to as the primary sealing surfaces s mechanical properties making. Be applied to nearly any product through improved design, technology and material.! Combinations, but has much better lubrication qualities and is commonly called the `` wear nose '' of the mechanical seal material! Wear rates if surface velocities are high to detrimental thermal coning can necessitate the shutdown the! Not a fixed geometric value it has will need to have to spend more money to replace the seal and... In service, the seal will be exposed to to as the sealing... That require self-lubricating properties across a seal faces as a gas, the more cost effective a seal... Issue, as long as they 've been properly selected for both seal faces when compared to the silica,...
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