NOAA Standard Specification MOC-573-2 Overhaul Repair of Hydraulic Cylinders.pdf
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- 1305M226Q0100REF
About this file
This is a Standard Specification issued by the National Oceanic and Atmospheric Administration (NOAA) Marine Operation Center for the overhaul and repair of hydraulic cylinders.
The specification establishes minimum requirements for contractors performing hydraulic cylinder maintenance work on NOAA vessels. Work scope includes: tagout and securing of system controllers and actuators; disconnection and capping of hydraulic lines with containment measures; cylinder removal and transport to a repair facility; complete disassembly and cleaning of all parts; external surface preparation and preservation per identified painting specifications; reassembly under clean conditions using new O-rings, seals, gaskets, packing, piston rings, nuts, washers, bolts, studs, and inlet/outlet fittings that meet or exceed original manufacturer specifications; lubrication with a product equivalent to Hilton's Hyper-Lube compatible with system fluid; reinstallation in original location; reservoir top-off and system air purging; and tagout removal. Quality assurance requirements include post-disassembly inspection of all components for bore and rod trueness, wear, damage, corrosion, and pitting, with submission of a Condition Report detailing inspection results and corrective action recommendations. Post-reassembly requirements mandate bench testing at system working pressure to verify smooth operation and seal tightness, followed by minimum four-cycle operational demonstrations to verify fitting and connection tightness, with Denso tape applied to all connections upon successful completion.
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Text version
MOC-573-2
September 2000
National Oceanic and Atmospheric Administration Marine Operation Center
Standard Specification MOC-573-2
OVERHAUL/REPAIR OF HYDRAULIC CYLINDERS
1. SCOPE: This specification provides the minimum requirements for the overhaul and/or repair of hydraulic cylinders.
2. REFERENCES
None
3. REQUIREMENTS
3.1 Tag out system controllers and actuators to preclude
inadvertent operation and secure the movable member to prevent movement while cylinder is removed.
3.1.1 Disconnect and cap hydraulic lines from the cylinder.
Ensure containment is provided to prevent spillage of oil.
Hydraulic lines and inlet/outlet ports shall be capped or plugged with threaded fittings to prevent leakage or contamination of the system.
3.1.2 Remove the cylinder from the ship and transport to
repair facility.
3.2 Perform the following work on the removed cylinder:
3.2.1 Completely disassemble the cylinder and clean all
parts.
3.2.2 Prepare and preserve the external painted surfaces in
accordance with the identified painting specification or as original.
3.2.3 Reassemble the cylinder under clean conditions using
new "O" rings, seals, gaskets, packing, and piston rings.
Materials used shall meet or exceed original manufacturers specifications. During reassembly lubricate the above with a product equal to Hilton's Hyper-Lube, that is compatible with the system fluid.
3.2.4 Provide and install new nuts, washers, bolts, studs and inlet and outlet fittings.
3.3 Reinstall the cylinder in its original location.
MOC-573-2
September 2000
3.4 Top off hydraulic reservoir to full mark and purge all air from the system taking care to contain any fluid bled off.
3.5 Remove tag outs.
4. QUALITY ASSURANCE
4.1 After disassembly, inspect all components for trueness of bore and rod, wear, damage, corrosion or pitting. Provide a Condition Report detailing the inspection results, contractor's corrective action recommendations, and list of additional parts, material and labor not covered by this specification, required to restore the cylinder to the manufacturers specifications.
4.2 After reassembly, bench test the assembly at system working pressure to prove smoothness of operation and tightness of sealing surfaces.
4.3 Cycle the cylinder through a minimum of four evolutions to demonstrate operation and tightness of all disturbed fittings and connections. Upon satisfactory demonstration of operation and tightness apply "Denso tape" to all connections.
END OF SPECIFICATION
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