Valve installation of common 9 major misconceptions and solutions

by jiewei

Even experienced engineers can make costly mistakes in valve installation. This article compiles key misconceptions and practical solutions to help you safeguard system reliability.

  1. Bolts are too long
    Problem: The bolt exceeds the nut by more than 2 teeth, increasing the risk of corrosion and fracture.
    Solution: Calculate the bolt length accurately and make sure it is flush and not exposed.
  2. Failure to install isolation valve
    Problem: Lack of independent isolation valve makes maintenance difficult.
    Solution: Install butterfly valve (save space) to realize quick isolation.
  3. Lack of pressure gauge interface
    Risk: unable to monitor the pressure in real time, relying on SCADA system there is a blind spot.
    Suggestion: Reserve pressure test interface, compatible with digital pressure gauge.
  4. Insufficient operating space
    Consequence: maintenance tools can not be used, increasing downtime.
    Standard: Reserve 1.2 meters of operating space and tool operating range.
  5. Non-disassembly design
    Challenge: Permanently fixed components that cannot be replaced at a later date.
    Design: Adopt flange or live connection to realize modular maintenance.
  6. Horizontal installation of concentric reducers
    Mistake: Horizontal installation of concentric reducers is prone to air buildup.
    Correction: Use eccentric reducers (bottom or top flat) for horizontal piping.
  7. Valve wells without drainage
    Problem: Accumulated water accelerates valve corrosion and affects operation.
    Measures: Install drainage pumps or deflector tanks to maintain a dry environment.
  8. Failure to exhaust air
    Impact: Air in the pipeline leads to unstable valve action.
    Method: Install exhaust valves upstream and downstream to release trapped air.
  9. No spare port
    Limitation: Cannot extend the sensor or instrument.
    Optimization: Reserve blind flange interface for future upgrading.
    Professional Installation Suggestions
    Material selection: Use stainless steel bolts (e.g. A2-70) for corrosive environments.
    Marking Management: Label valves with parameters and date of installation for traceability.
    Training Compliance: Ensure your team is up to date on ASME B31.3 pipeline alignment standards.

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