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.

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 Figure 1. An example of a modern centrifugal compressor. The dry gas seals are shown at the both ends of the rotor. When using the product as a sealant, make sure that application results in a good bond between Dry Seal MP and the substrate. Typically, compressors with dry gas seals are used in applications in which they are critical parts of the entire process. A well-designed dry gas seal system will prevent extensive damage to the dry gas seal, compressor and process. Compared to pump operations, dry gas seals and compressors usually operate at higher speeds and pressures. Every component of a dry gas seal must be designed to manage exposure to extreme conditions.A dry gas seal creates a film of gas (3) between a rotating seat (1) and a stationary face (2). This film of gas (or gap) between the seal faces must be generated and maintained at 150 to 200 micro-inches so the seal faces do not touch and the smallest amount of gas is allowed to leak through the seal. Other systems for working with dusty fluids are air barriers, but they must be constantly supplied with compressed air to keep the product “fluid” away from the sealing area and this incurs high operating costs. On the contrary, Dry seals use a compressed air line to function correctly, but they do not need to consume its flow, which means there is no airflow through the seal and the seal does not become worn. This effect should not be confused with the "beading" effect often associated with water repellents.

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. All Dry Gas Seals need additional protection from the process and the bearing lubrication sides of the seal 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. 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.

Process and Separation Seals

Compatible with double-glazed sealed units, all glazing tapes and with laminated, acoustic and safety glass 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. Differential pressure on any seal stage: Another good recommendation is the installation of differential pressure for each seal stage including the primary seal, the secondary seal, and the barrier seal (acting as the tertiary seal). In this way, the differential pressure (and the condition of each seal) can be assessed, verified and compared to results obtained by other instrumentation and monitoring systems. Since clearances between seal faces are usually less than 4–10 microns, the seal gas passing between faces should be clean and dry. While the seal filtration requirement is 1–3 microns, 1-micron filtration systems are typical for dry gas seals.