Repair Care International DRY SEAL® Replacement Putty Elastic Glazing Sealant White

Product Information

Compatible with double-glazed sealed units, all glazing tapes and with laminated, acoustic and safety glass The operation range of seal system instruments: The instrumentation and control systems for sealing systems vary per application. In some of these applications, instruments or valves might be improperly specified. Sometimes the instrument range is not sufficient, and too often seal system flowmeters are not sized properly. The inspection of the seal can help identify the root-cause of high flow of the primary vent. If the primary seal faces are damaged or deteriorated, it could be deduced that the leakage path is the primary seal itself. Meanwhile, if the primary seal faces are in good condition, it can be determined that high primary vent gas leakage is not caused by damage to the primary seal faces. In such a case, other root-causes and leakage paths should be examined. However, where sprayed, items such as windows and surfaces which are (or will be) varnished or painted, as well as plants, should be covered with Polythene Sheets. Our Glass Protection Film is ideal use on windows. Flowmeter on secondary vent: A good recommendation is to consider a flowmeter on the secondary vent. This can give good information regarding the secondary seal health and the overall seal system conditions.

Silicone has been used to seal building interiors and exteriors for close to a century because silicone sealants are ultraviolet (uv) stabilised and are resistant to harsh weather environments such as freezing cold and extreme heat. This is because the operational temperature range of silicone is -50 deg C to 250 deg C. However construction specifiers have been turning to pre cured silicone seals for the past few decades because a pre cured sealant system can handle at least 100 percent more expansion and at least 25 more compression movement than traditional ‘liquid applied ‘elastomeric sealants. The RCA (root-cause analysis) is an important step after a seal failure. After a dry gas seal failure, the seal should be sent to the seal manufacturer’s facility for dismantling and investigation.Dry seals offer an alternative for dusty or extremely viscous applications that guarantees complete sealing, minimum maintenance, protection of the other system components such as the wear of the shaft and less energy consumption due to motor friction. Dry Seals adapt to all kind of equipments thanks to a floating design of the flange, helping to easily assemble to a bearing to simplify the system. Figure 2. An example of a 3D model of a modern dry gas seal. The dry gas seal details are shown in this 3D model.

The separation seal is installed between the compressor bearing and the secondary dry gas seal. The separation gas system function (the barrier seal system function) prevents lubrication oil from entering the dry gas seal. The nitrogen flow into the separation seal should be properly monitored. In many machines, the nitrogen supply system (such as control valves, control setting, etc.) does not receive proper attention, which could eventually result in seal problems and even seal failures. A low flow of nitrogen through the separation seal may allow the bearing lubrication oil to migrate into the seal chamber, causing seal face failure. A low flow of nitrogen is sometimes the product of an inaccurate setting of control valves on the nitrogen seal supply line. Dry gas seal root cause analysis The first dry gas seal for a compressor was patented by Kaydon Ring & Seal in 1951 when it was known as Koppers Corporation. Field applications of dry gas seal designs were completed in 1952. The original patent was for Kaydon's "Tapered Ramp" lift geometry, a constant diameter / variable depth dynamic lift design. From that first dry gas seal ever manufactured for a centrifugal compressor in 1951, Kaydon Ring & Seal has been instrumental in developing the dry gas seal into one of the most reliable and maintenance free sealing solution available today. Unscheduled shutdowns caused by loss of control of the seal oil system and/or seal oil pumps/driven failures.Over the years, features in dry gas seals have changed, improving the technology. Many small adaptations have taken place to correct the flaws or deficiencies of past dry gas seal systems. These changes range from adjusting the hardness/durometer of an o-ring for handling high-pressure dry gas seals to using polymer gaskets, which have no depressurization limits and will not take a set such as elastomers do. The question is, “Although these are small improvements, how do they affect the reliability of dry gas seals?” A minimum shaft speed is required for the operation of dry gas seals. This speed is known as the lift-off speed. Care should be taken for variable-speed turbocompressor operation (particularly steam turbine- and gas turbine-driven compressors) to ensure the operation is always above the specified minimum speed for the dry gas seals. Steam turbine- and gas turbine-driven compressors usually require cool-down operation at low speed after a shutdown and this low speed rotation should be performed with respect to the specified minimum speed for the dry gas seals. Historically, many dry gas seals have been damaged in low-speed operations. Finding a sealing element that guarantees sealing without leaks and adds durability to applications of this type poses a difficult challenge. If painting DRY SEAL do so within a month of application. If painting at a later date, lightly sand to create a key An important section of a dry gas seal is the vent system. Special attention is required for the primary vent system (vent system of primary seal). In the primary vent system, a vent rupture disc is typically installed in parallel with the vent line to rupture at a set pressure and prevent excessive pressure to instruments on a primary seal failure. A pressure-relief valve (PRV) may be installed instead of rupture disc, particularly for large machines.

To create the right environment for the seal, contamination must be prevented from entering the seal. From the process side, a process seal is required to prevent process gas from contaminating the dry gas seal environment. On the atmospheric side, where lubrication oil is present, the oil must be stopped from entering the dry gas seal environment. This effect should not be confused with the "beading" effect often associated with water repellents. As the population increases more and more buildings are going to be built to accommodate a already over populated world and if the problems of today’s technologies are not changed when we have solutions to change them, then our planet will just spiral out of control! Lubrication oil is another important root-cause of seal failures. The first section that will be contaminated by lubrication oil is the barrier seal (the separation seal). For such cases, there will be oil ingress past the barrier seal. The second section that will be contaminated is the secondary seal. If the lubrication oil can pass through barrier seal and contaminate the secondary seal, the secondary seal may fail, leading to problems with the primary seal (oil ingestion and subsequent failure). Seal system improvements

The oil carryover from the upstream can generally be a problem. Compressors in the upstream — whether oil-flooded screw compressors, oil-lubricated reciprocating compressors, or old-fashioned, oil-sealed turbocompressors — can introduce oil into the gas flow, which usually creates some problems for compressors with dry gas seals in the downstream. Other installations, such as reactors and processing equipment, can contaminate the gas with dirt, dust or liquid in normal or abnormal situations. Adjoining Surfaces: Due to the thixotropic nature of this product, where it is applied by brush or roller, accidental contamination of non-target surfaces can usually be avoided by taking reasonable care. The next article, in the March 2012 issue, will focus on selecting the proper seal features—face materials, groove geometries, secondary sealing elements and gasket extrusion/explosive decompression—to provide a reliable dry gas seal system.

All Dry Gas Seals need additional protection from the process and the bearing lubrication sides of the seal At Dry Seals we have harnessed this technology by creating a series of cured silicone extrusions that we call Dry Seals. With its unique thixotropic consistency and excellent water repellent properties on a range of building materials, Dryseal Masonry Waterproofing Cream stands out. Large numbers of dry gas seal assemblies have problems because of an issue with an O-ring or a V-ring. There are many sealing elements (O-rings, V-rings, U-rings, etc.) in a seal assembly, which can cause seal operational problems. If an O-ring or a V-ring allows gas to bypass, the gas stream would pass up the primary vent. In many cases, the deterioration of a ring or a sealing element may explain the rise in the primary vent flow, which could be confused with seal face deterioration. Dry Seals can be offered in different versions with an included bearing, a split system and/or a food certification.When using the product as a sealant, make sure that application results in a good bond between Dry Seal MP and the substrate. Dryseal can easily accommodate most complex roof detailing and can be used on flat and low pitched roofs, on garages, extensions, or to replicate lead sheet on heritage buildings. Dependent on the substrate, type and degree of soiling, we recommend the use of one of our Masonry Fungicide Productsor Green Gone Path & Patio Cleaner. When cleaning, make sure that the masonry is damaged as little as possible. All these factors—seal design, process and separation seal, seal configurations, dry gas seal panels and auxiliary systems—must be reviewed, assessed and designed for the seal’s intended application. With strict adherence to these guidelines, a dry gas seal system can be designed that offers the highest efficiency and reliability, preventing unnecessary plant shutdowns and subsequent loss of production and catalysts.