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

 

 

 

 

 

 

 

 

 

 

 

 

 

 
Many boilers have been ruined  with system 
contaminants such as pipe dope, cutting oil, 
metal shavings or chips and other debris which 
are left in the piping. If these contaminants are 
not removed, they will end up in the boiler. 
 
SYSTEM CLEANING PROCEDURE 
For steam systems, the boiler will need to be 
connected to the header utilizing steam to purge 
the piping and thus push the debris out of the 
system. However, at this time all condensate 
must be wasted until it runs clear and water 
analysis of the condensate indicates that it is free 
of contaminants. Steam trap strainers must be 
periodically opened and cleaned of any debris 
which accumulates. 

During this system clean out, the boiler make-up 
water must be properly softened and treated. At 
the conclusion of the system clean out, the 
condensate must be reconnected. 
 
For old or existing steam systems, the installation 
process may have jarred debris loose. Following 
the boil out of the new boiler, the condensate 
should be wasted until it is within proper 
guidelines. Check all steam trap strainers to 
assure their cleanliness. Refer to the succeeding 
section on replacement boiler installations. 

 

 
BOILER MUST CONTROL FEED WATER 
The water feed to the boiler must be controlled by 
the boiler-mounted water level control. It is 
unacceptable to use gravity return or to let the 
water feed be controlled by a condensate/ 
receiver/ condensate pump system. The water 
feed to the boiler must be controlled: 

 by a feed pump control which is mounted on 

the boiler. This control is to activate the feed 
pump on a boiler feed system. It will be 
necessary to supply such a system if not already 
installed. - OR - 

 by an automatic water feeder mounted on the 

boiler. This is used only on systems requiring 
100% make-up, such as humidification, steam 
process, etc. 

It is not recommended to provide the make-up for 
a closed steam heating system to the boiler by 
means of a water feeder. It is preferred that 
system make-up be connected to the condensate 
return tank of a boiler feed system. 
A boiler feed system may be used in conjunction 
with an existing condensate receiver system by 
allowing the receiver system to pump condensate 
into the boiler feed system tank. 
                                                                  
CLEAN OR REPLACE ALL SYSTEM PIPING 
AND HEATING UNITS 
Arrange for chemical and mechanical cleaning of 

the entire system. A chemical treatment company 
should be consulted for the proper means of this 
chemical cleaning. 
 
Replace any piping considered to be deteriorated 
beyond safe or cleanable condition. Flush the 
system clean, being certain to isolate the boiler. 
 
DO NOT FLUSH THE SYSTEM THROUGH THE 
BOILER 
 
NOTE: For some old systems, there is a 
reluctance to clean the piping because of the 
possibility of leaks occurring in badly corroded 
lines. Should the customer refuse cleaning, it is 
necessary to install filtration equipment. Install 
either a fibrous  filter or a centrifugal filter in the 
boiler return piping. This will collect and remove 
sediment from the system. A booster pump may 
have to be installed as well to overcome the 
additional pressure drop introduced in the line by 
the filter. When filling the system, provide 
chemical treatment as outlined in Section 3.5. 
 
                                                                 

Failure to properly clean the system or to install 
mechanical sediment removal equipment can 
result in tube blockage and severe corrosion plus 
damage to pumps, controls, and air removal 
device.