Valve diagnostics и predictive maintenance
Цель: Изучить тему «Valve diagnostics и predictive maintenance» и закрепить её практическими заданиями и самопроверкой.
2 акад. часа чтение и разбор теории, решение задач, работа со схемой или виртуальным стендом и проверка понимания.
Основной материал
Smart positioner tracks travel, friction, air behavior, response time and cycle counts. Increasing friction can indicate packing problems; slow response - air restriction; mismatch command-position - stiction or mechanical fault.
Partial Stroke Test
For ESD valve normally static, full test requires shutdown. PST moves valve small portion and returns, checking ability to move without fully interrupting process. It reduces undetected dangerous failure probability but does not replace all full-stroke tests.
Практическая работа
Trend stem friction grows month by month while control remains acceptable. Explain maintenance action before valve sticks completely.
Самопроверка
• Какие diagnostics дает smart positioner?
• Что показывает friction trend?
• Для чего PST?
• Заменяет ли PST full stroke?
• Почему predictive maintenance better than waiting for failure?
Что нужно запомнить
- Smart positioner tracks travel, friction, air behavior, response time and cycle counts.
- Increasing friction can indicate packing problems; slow response - air restriction; mismatch command-position - stiction or mechanical fault.
- For ESD valve normally static, full test requires shutdown.
- PST moves valve small portion and returns, checking ability to move without fully interrupting process.
- It reduces undetected dangerous failure probability but does not replace all full-stroke tests.