Bryan Boilers Forced Draft Steam Boilers ユーザーズマニュアル

 

 

 

 

 

 

 

 

 

 

 

 

 

 
An alternate method is to completely dry a clean 
boil (by blowing hot dry air though the boiler) and 
then purge the air from the boiler and pressurize 
with 5 psig nitrogen. Be aware that all metal 
surfaces which are not completely dry are 
vulnerable to corrosion, particularly if oxygen is 
present. 
 
2. If a boiler has been down for repairs and is to 
be laid up, it should be operated to pressurize with 
steam and then drained and pressurized with 
nitrogen as in step 1. 
 
3. All connections must be blanked or tightly 
closed. 
 
Note: Operating boilers must be removed from 
service to minimize adherence of boiler water 
suspended solids on boiler metal surfaces. Refer 
to previous instructions for boiler washdown. 
 
RETURNING IDLE BOILER TO SERVICE 
 
After wet lay-up 
To start an idle boiler after wet lay-up, use the 
following procedure: 
 

 
1. If the boiler was pressurized with nitrogen, 
disconnect the nitrogen supply source and vent 
the boiler. 
 
2. Using the blowdown valve, drain the boiler 
partially and make up with feedwater so as to 
dilute the chemical residuals to operating 
concentration levels. 
 
3. After the boiler water concentrations and the 
water level are returned to proper operating 
conditions, the boiler can be started in the normal 
manner. 
 
After Dry Lay-Up 
To start an idle boiler after dry lay-up, use the 
following procedure: 
 
1. Disconnect the nitrogen supply source and vent 
the boiler in a safe manner - external to the 
building and away from air intakes. Then 
thoroughly purge the boiler of nitrogen with dry air. 
 
2. The boiler was to have been cleaned before the 
lay up procedure. So it is necessary only to fill the 
boiler with properly treated water. Then proceed 
with start-up.