VALVES

COMMON PROBLEMS IN VALVES

Valve does not work upon installation

Valve fails after a period of successful usage

Valve not operating

Valve Hunting

Valve not operating linearly

TROUBLESHOOTING SOLUTIONS WE OFFER

Whether the air supply is normal.

The positioner power supply is normal or not.

Check the air filter regulator working condition.

Check the volume booster, airlock relay and solenoid value condition if installed additionally.

Check all the tube line free from the choke.

Check the i /p converter working condition.

Check the output of the positioner.

FITTINGS

COMMON PROBLEMS IN FITTINGS

Excessive Tightening of Compression Tube Fittings

Use of Insufficient Torque/Improper Tools

Mounting of Instruments on Vibration Source

Use of Nonstandard Leak Test Agent

Improper Storage/Handling of Tube

Inadequate Design of Tubing Clamp Support Systems

Corrosion

Incorrect improper process hook-up installation

Tube Fitting Failures

Facility Breakdown

Safety Related Breakdown

Non-Safety Related Breakdown

Typical Area

Mitigation Path

Use of Proper Tools

Leak Test Agent

Proper Handling & Storage

Jacketed or Shielding of Tubing

Detailed Engineering Design for Clamp Supports

Understanding the Connections

The Pump Elements

The Process Elements

Control Elements

TROUBLESHOOTING MATHEMATICAL CORRECTION WE DO

Determine the amount of energy each element in the piping system model should use based upon the system's "as designed" parameters

Determine the amount of energy each element in the physical system is consuming based on the plant's operation data

Get the control loop function test performed and get the logic verified. If some malfunction in the control loop or logic, then get it corrected.

Get the original design calculations and rated Cv information

Check the current operating conditions and try to locate current situation between original design cases.

If the current operation is too far from original design cases then perform the sizing (Sizing of valve) to estimate the current Cv. Compare the calculated Cv against the design cases and find out the current Cv represents how much opening. If current opening is in between 10% and 90% (ideal healthy range is 15-85% for design cases for installed control valve, it can be relaxed little bit) then valve can still function look for other mechanical damage like

Check for suitability of valve for selected for service or even service has changed over period from clean service to fluid with solids content.

Wear and tear in the trim (are common phenomena observed), this can alter the characteristic of the selected valve. Look for the damage to the valve plug, cage and seat for any damage. If damage is observed then get the repair done from the valve supplier.