A vast majority of the gaskets used in the Ductile iron pipe industry are made of styrene-butadiene rubber, commonly referred to as SBR. While SBR gaskets are reliably listed as safe for continued contact with potable water per NSF-61, chemical composition tests on combusting rubber have shown a likelihood for the release of hazardous air pollutants being released while burning.
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All you need to ask yourself to realize this concern is, "would you breathe the smoke from a burning pile of car tires?" Tires ─ not harmful. Smoke from the burning tires ─ not good.
Beyond the concern of the fumes, the residue and mess created within the joint from the melted rubber might create sealing problems with the replacement gasket. Simply put, the burning of the rubber gaskets is never recommended by McWane Ductile.
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Dismantling Joints play a decisive role in the design and layout of pipelines and valves. They are an essential aid during the installation and removal of pipe sections and valves. Without a dismantling joint offering longitudinal adjustment, it is almost impossible to insert a valve exactly into a pipe section. Thanks to this adjustability of the dismantling joint, the valve can be fitted next to the dismantling joint, and the dismantling joint can be to set to the exact length required prior to being securely connected to flanges.
The reverse sequence is used for dismantling, where readjustment of the length of the dismantling joint creates enough space to loosen and remove the valve. In both cases, the dismantling joint guarantees fast installation and removal, thus contributing to increased efficiency and reducing site operations and down time. The procedure is similar where pipe sections have to be fitted together. Certain types of dismantling joints are also suitable for use without restraint in flexible pipelines. Finally, dismantling joints can be used to fill gaps e.g. where a pump installed in a fixed position has to be connected to a pipe protruding from a wall.
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