1. A

    Control valves leakage class VI

    Dears; we have recently change the plug and seat of a globe valve (gas CH4; leakage class VI). the DP pressure in the data sheet is 39 bars. once put in service the pressure transmitter downstream the valve is showing 2.5 bars, even if the valve is in close position, pressure upstream is 41.5...
  2. A

    ST Power Generator

    We have 2 PGs 40MW each one,connected to the grid. If island mode is selected, 52G breaker open (or trip), PG1 goes to speed control, and PG2 goes to droop control (KW). What happened is that we want to disconnect from grid "due to some planned job of public grid" (normally to open 52G). But...