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How to Install Asbestos Rubber Mats:
Proper installation of asbestos rubber mats is essential for ensuring a secure and long-lasting seal. Follow these steps carefully to avoid any issues with the gasket or flange connection.
First, make sure to completely remove all remnants of the old gasket from the flange surface. If possible, take the old gasket and use it as a reference for cutting the new one. Use a metal flange scraper, some spray gasket remover, and a wire brush to clean the surface thoroughly. After cleaning, inspect the flange for any damage, such as warping or dents, and ensure that the surface is smooth and free of debris.
Next, choose the thinnest gasket that still meets the requirements for your application. However, if the flange is warped or severely damaged, you may need a slightly thicker gasket to compensate for irregularities. A thinner gasket is generally better because it allows for more even compression, which improves the sealing performance.
It’s recommended to use a ring gasket rather than a full-face gasket, especially when dealing with convex flanges. Ring gaskets are designed to fit precisely into the flange, reducing the risk of misalignment. This also helps in achieving a more uniform compression across the gasket surface.
Avoid using wet anti-adhesive agents, as they can interfere with the sealing process. Instead, opt for dry lubricants like talc, graphite, or mica. These materials provide effective separation without compromising the integrity of the gasket. Never use metal-based anti-adhesives, as the particles can get trapped in small imperfections on the flange, leading to poor sealing and potential leaks.
Before placing the gasket, make sure it’s cut correctly according to industry standards such as ANSI. Position the gasket on the flange and align it carefully. For convex flanges, the bolts will help center the gasket automatically once tightened. Always double-check the alignment before proceeding.
Use hardened flat washers and well-lubricated fasteners to ensure even pressure distribution. When tightening the bolts, always use a torque wrench to apply the correct initial load. This prevents over-tightening, which can damage the gasket or cause uneven compression.
Tighten the bolts in the correct sequence to ensure even pressure on the gasket. A common method is to tighten them in a star pattern or in a circular order. This prevents distortion and ensures that the gasket is compressed uniformly. For the first tightening, apply only one-third of the recommended torque. Then, after 12 to 24 hours, complete the final tightening following the same sequence to lock the flange securely.
Always follow all safety regulations during the installation process. Avoid using liquid or metal-based lubricants on the gasket, as they can compromise the seal. Stick to dry options that won’t affect the gasket’s performance. Whether you’re installing an asbestos rubber mat, PTFE pad, or any other type of gasket, proper technique is key to a successful and durable seal. 
Asbestos rubber gasket installation method
SSurface centrifugal pump is a type of centrifugal pump that is designed to work on the surface, meaning it is not submerged in the liquid being pumped. These pumps are used in a wide range of applications, including supplying drinking water, irrigation, drainage, and low-pressure liquid transfer.