Quantcast Operating Valves and Fixtures - mo1180279

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Custom Search Flexible Hydraulic Hose and Fitting Assemblies. Examine under working pressure
flexible hydraulic hose and fitting assemblies and flexible couplings installed between the check
valve or control valve and the cylinder. Evidence of leakage, slippage of hose fittings, and
damage to outer hose coverings sufficient to expose reinforcement or distortion or bulging of
hose body are cause for replacement of the hose and fitting assembly or the sealing element of a
flexible coupling. Check hose and fitting assemblies for proper identification and replacement
date. Storage and Discharge Tanks. Examine the discharge tank for corrosion and leaks.
Note whether the tank is covered to prevent entrance of foreign material and is suitably vented to
the atmosphere. For an electro-hydraulic levellator, determine whether there is sufficient liquid
remaining in the tank when the lift is at the highest point of its travel to cover the intake and to
prevent cavitation. Means should be provided for indicating the permissible minimum liquid
level for equipment. Operating Valves and Fixtures. Check that all operating valves and fixtures are
operating in their intended manner and that all fastenings are in place and secure. Equipment Location. Pump and control equipment access should be unobstructed by
building construction or debris. Access space should be clean and free. Minimum 18" clearance
on three sides of unit.
14.2.5 Controls
The following inspection procedure applies to all the control mechanisms, including starting
panels for the power unit drive motor. A good preventive maintenance program on the control
equipment will greatly reduce shutdowns. Inspection Made with Power Off. Open the mainline switch and examine all relays,
switches, contactors, control circuit rectifiers, transformers, capacitors, etc. Check for
excessively worn or burned contacts, broken connectors, broken or cracked resistance grids or
resistance tubes. Any fuses that are shorted with wire, solder or metal strips must be replaced.
Check whether contacts of reverse-phase relay, where provided, are open. Examine to see that it
is clean. Any accumulation of combustible materials, especially on resistance grids or wires or
on control circuit rectifiers is a common cause of fire. Also, look for excessively worn pin
hinges on relays or contactors.


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