Machinery Lubrication


Machinery Lubrication magazine published by Noria Corporation

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26 | September - October 2017 | HYDRAULICS will result in leakage at the fitting or elbow. A 45- or 90-degree sweep ell will reduce the turbulent flow as the oil flows through the line. Proper clamping is essential to reduce shock in the system. In the photo on the right, U-bolts have been used to clamp the pipes. In this instal- lation, you can see that the pipe has moved due to hydraulic shock. This eventually will lead to wearing of the pipe and leakage. U-bolts, conduit clamps and beam clamps are not built to withstand the shock in a hydraulic system. A proper hydraulic clamp should be used (as shown in the photo below). Clamps should be spaced every 5-8 feet, depending on the size of the line, and must be tightened on a regular basis to eliminate movement of the pipe and subsequent leakage. A clamp should also be installed within 6 inches of the termi- nation point. When properly placed, hoses can absorb shock in the system. A hose should be installed at the outlet of the pump prior to entering the manifold or main header. This will reduce shock at the pump when the oil flow is rapidly deadheaded. Hoses should also be installed prior to connecting to a valve, manifold or cylinder. The only exception is if the cylinder is mounted vertically. In these applications, pilot-operated check valves or counterbalance valves are used to maintain oil in the cylinder when in the raised position. The hose should therefore be installed before the check or counterbalance valve. Be sure to make the hose long enough, as its length can change when the pressure spike occurs. On the other hand, hoses should not be made too long either, as they will rub on another hose, catwalk, beam or other structure. U-bolts should not be employed to clamp pipes. Hoses should be installed at the pump outlet prior to entering the manifold or main header. Hoses that are too long may rub on another hose or other structure. An example of a proper hydraulic clamp

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