GE Mooney Flowgrid Instruction Manual

Contents

Mooney Flowgrid Regulator Instruction Manual | 15© 2015 General Electric Company. All rights reserved.TroubleshootingFirst Steps1. Verify the regulator specifications fit the applicationconditions.Min/max inlet pressure, control pressure range &min/max operating differentials should be checkedto make sure the regulator and pilot are designed tooperate in the present conditions.2. Verify the regulator is piped correctly.Even though the regulator may have operated in thepast, check that current piping connections matchrecommendations on pages 7-10.3. Verify the regulator is sized correctly.Regulators operating below 10% or above 80% oftheir maximum capacity given current applicationconditions tend to have more problems. Considerreduced capacity trim or a larger regulator in thesecases.Potential IssuesRegulator does not shut off.1. Refer to the failure mode chart to diagnosepotential causes.2. Clean or replace regulator and pilot components asnecessary.Erratic Control.1. Check for damage, debris in the restrictor andcontrol pilot. Replace, clean and lubricate compo-nents as necessary. Consider pilot supply filtration(Type 30 Filter).2. Check for the potential of hydrate formation orfreezing liquids in the pilot system. If liquids are pres-ent consider gas conditioning before the pilot and/orregulator, heating the supply gas to the regulator, orheating the pilot supply gas (pilot gas heater).3. Check the sense line location and assure it is awayfrom turbulent locations. Moving the sense line to anew location often solves control problems.4. Check to make sure needle regulators are not usedon any pilot system connections. Full opening typesuch as ball regulators are recommended.5. Check for pilot vent port blockage.Instability & Speed of response issues.1. Change restrictor setting. Refer to page 11.2. Check the sense line location and assure it is awayfrom turbulent locations. Moving the sense line to anew location often solves control problems. Factoryrecommendation is 8-10 pipe diameters away fromsources of turbulence such as tee’s, elbows, reducers,regulators, etc.3. Check to make sure needle regulators are not usedon any pilot system connections. Full opening typeregulators are recommended.4. Check for pilot vent port blockage.The regulator will not regulate to set point or“droops-off”.1. Check for proper sizing. The regulator may be runningout of capacity during peak demand periods.2. Adjust the restrictor to a higher gain (smaller) setting.Refer to page 11.The regulator fails open or fails closed.1. Refer to the table below to diagnose failure modes.ProblemFailure ModeFailOpen FailClosedDamage to the flexible element X XDamage to the flexible element on theupstream side (less likely) XDamage to the flexible element on thedownstream side (more likely) XDebris between the flexible element andthe seat XBlockage of pilot supply pressure XBlockage1 of the restrictor XBlockage1 of the pilot supply line XLoss of the sense line (PRV pilot) XLoss of the sense line (Relief Pilot) XBlockage1 of pilot discharge XPilot diaphragm rupture if (PRV pilot) XPilot diaphragm rupture if (BPV relief pilot) XBlockage1 of pilot orifice X1 Blockage can be caused by debris, hydrates, freezing or damage to thecomponent involved.Table 7

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