Baker Hughes Masoneilan 74000 Series Instruction Manual

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Contents

Baker Hughes Masoneilan 74000 Series Instruction Manual Manual pdf 6 page image

4 | BHGE© 2018 Baker Hughes, a GE company. All rights reserved.UnpackingCare must be exercised when unpacking the valve toprevent damage to the accessories and component parts.Contact the local BHGE Sales Office or Service Centerwith any issues or problems. Be sure to note the valvemodel number and serial number in all correspondence.InstallationThe 74000 Series control valve must always beinstalled with the flow tending to close the valve plug.For applications where insulation of the valve body isrequired, do not insulate the valve bonnet.Piping CleanlinessBefore installing the valve in the line, clean piping andvalve of all foreign material such as welding chips, scale,oil, grease or dirt. Gasket mating surfacesmust be thoroughly cleaned to ensure leak-freejoints. Sacrificial start-up fixtures can be purchasedfrom BHGE to protect the operational trim during theinstallation and line flushing phases.If major system or piping modifications (or repairs)are performed, thorough flushing and blowdownof the system will be required prior to reinstalling the74000 Series trim. Sacrificial flushing trim should beinstalled in this valve to protect the integrity of the flowpassages. Failure to follow this warning will violate thevalve warranty agreement and could result in controlinstability, excessive noise levels, and valve leakage.Isolation Bypass ValveTo allow for in-line inspection, maintenance and removalof the valve without service interruption, provide amanually operated shutoff valve on eachside of the control valve and a manually operatedthrottling valve in the bypass line.Heat InsulationIn case of a heat-insulated installation, do not insulatethe valve bonnet and take protective measures relativeto personal safety.Hydrostatic Testing and Line CleaningDuring this operation, the control valve must not be usedas an isolating valve. This means that the valve mustalways be opened before carrying out pressure testsin the process line, cleaning of pipes, etc. Otherwiseequipment damage or failure of the seal rings couldresult. Flushing and hydrostatic test equipment can bepurchased from the Masoneilan factory.Flow DirectionThe valve must be installed so that the process fluid willflow through the valve in the direction indicated by theflow arrow located on the body.Welded ConnectionsCarefully review the information in this section priorto welding any valves inline. Refer any additional questionsto the local BHGE Sales Office or Service Center.Pre-Weld PreparationCarefully follow the installation steps defined inthe sections noted above prior to performing weldprocedures.Welding ProcessPerform welding process in accordance with thestandard requirements for the materials and weldconstruction of the specific valve. Apply post weldheat treatment if required.Internal valve components should be removed priorto performing any post weld heat treatment in order toprevent damage. If unable to remove the elastomericcomponents, then other methods must be employedto prevent the local temperature around the sealsfrom exceeding the maximum material limits (typically450°F/232°C for teflon-based materials).Post Weld Cleaning & AssemblyInspect the body, bonnet, and trim components forcleanliness and surface condition. Remove any foreignmaterials, such as weld chips, slag or scale. Make surethere are no nicks, scratches, burrs or sharp corners onsealing and sliding surfaces. Clean all gasket interfacesurfaces and reassemble using new gaskets to ensuresealing integrity.Actuator AssemblyAssemble the actuator onto the control valve usingthe appropriate instructions for the specific actuatormodel and type. Connect air pressure lines to theactuator ports to meet intended operating mode(i.e., air-to-extend, air-to-retract, or double-acting).