By Robert Beverly
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Hardback, ex-library, with traditional stamps and markings, in reasonable all around , appropriate as a learn replica.
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Extra info for Engineered Systems February 2012
The seals have a bolt hole cavity on each side of which are molded cones, which are forced inward as torque is applied to the bolt, increasing air pressure inside the cavity. A molded compression-assist boss on each side of the pressure plate permits increased compression loading, preventing liquids from entering the cavity for better corrosion control (Figure 3). It should be noted that the shoulder volume or the thickness of the rubber surrounding the bolt-hole cavity must be sufficient to prevent the bolt from tearing through the seal when it is tightened.
The diameters of both the bolt and bolt cavity provide for only for minimal clearance, so the sealing element expands to fill the annular space between the pipe and penetration rather than the space between the bolt and bolt cavity. The bolts are lubricated, those made of Type 316 stainless with a PTFE-based lubricant to prevent galling or seizing during tightening. On most modular seals the nut applies torque to the pressure plates through two planes of distribution (Figure 6). Modular mechanical seals must be installed so as not to create a path for liquids within the penetration.
Installing loosely fitting flange faces into both sides of the penetration wall will prevent this from occurring, and is now accepted industry practice. All modular seals can accommodate some angular misalignment, which varies with the relationship between the size of annular space to be filled and the size range of the seal. The closer the annular space is to the middle of this range and the thicker the seal, the more misalignment it can tolerate. If misalignment of the pipes through a wall is a design factor, consideration should be given to oversized sleeves or cored penetrations that can accept larger seals.