Soot blower to clean the boiler pipes. They should be managed how many insert into the boiler. To prevent too much steam is sprayed. It could be make damage the wall of boiler.
The steam pressure is 250 psi. after poppet valve into tube sootblowing.
If more than one soot blower insert at same time in one group. The 2rd soot blower will fail alarm. To making like this. Install pressure switches series each soot blower. So only one address input for pressure switch into PLC discrete.
Sunday, 20 November 2011
Tuesday, 15 November 2011
23 VDC don't believe it
Some day we measured in field power transmitter 23VDC. But the Transmitter blank (OFF) on display. Measured current just +/- 1 mAmp.
Disconnect the transmitter and checked in the workshop. The transmitter could be ON.
What happening in the field...? Negative (-) pole from DCS marshaling broken.
Replaced the cable form DCS marshaling into the transmitter.
If you found 23VDC in field and display transmitter OFF. Don't believe it. And please make sure your cable. Connected in properly.
Disconnect the transmitter and checked in the workshop. The transmitter could be ON.
What happening in the field...? Negative (-) pole from DCS marshaling broken.
Replaced the cable form DCS marshaling into the transmitter.
If you found 23VDC in field and display transmitter OFF. Don't believe it. And please make sure your cable. Connected in properly.
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