2-10 General Information MN2408Figure 2-6 Exhaust System CalculationsExhaust PipingCaution: The weight of the exhaust system must never be imposed on the turboñcharger outlet.Damage to the turboñcharger and other components may result.An exhaust system must withstand the vibration and thermal expansion that they are subjectedto, yet supported well enough to remain independent of the engine.The most common method of providing flexibility is with the use of bellows type flexible piping.This piping component allows lateral and linear movement of the piping system withoutsubjecting fixed components to excessive stress. A minimum of 12 inches of flexible connectionmust be provided at the engine exhaust manifold to allow for thermal expansion and vibration. Ifthe engine is to be mounted on spring type vibration isolators, increase the length to 24 inches.This component can be specified to be provided by your Baldor distributor. Flexible pipe shouldnever be used for pipe bends or to cure misalignment problems.Exhaust piping systems may be supported by a wide variety of methods to long as the systemremains flexible, and capable of withstanding thermal expansion.The material most commonly used for straight runs and elbows in exhaust systems is Schedule40 black iron. If hanging weight is a problem, other materials may be used. Galvanized pipingshould never be used in exhaust system. Where exhaust piping passes through combustiblematerial, exhaust thimbles must be used. See Figure 2-7.Figure 2-7 Exhaust Pipe Thimble InstallationRain ProtectionMoisture entering the engine through an exhaust system can cause extensive damage. Exhaustoutlets must have a rain cap or be horizontal to prevent such damage. See Figure 2-7.