TECHMAIL: Steam Blow-Off Piping

INSTRUCTIONS FOR INSTALLATION OF CONTINUOUS BLOW-OFF PIPING The object of the MADDEN SYSTEM is to continuously remove a high percentage of foreign solids which accumulate in all boilers due to the evaporative process.

The most effective results are obtained when the blow-off pipe is extended into the boiler drum to a point of turbulent flow. Steam bubbles moving upward will carry the suspended solids present to the surface of the water; thus it is desirable to have the blow-off pipe extend inward to, or near, the section of upsurge.

In the instance of single drum boilers or others where it is necessary to install continuous blow-off in the same drum with incoming feed water, the blow-off pipe should be located to bleed from a point as far removed as possible from the feed water inlet; otherwise clear feed water, rather that concentrated boiler water, will be removed. Whenever a deflector plate or baffle is installed in the drum, separating the feed water from boiler water, the blow- off pipe should be on the boiler water side of the plate.

As a general rule, one pipe connection into the boiler drum is all that is required. The exceptions to the rule are represented by straight tube boilers with more than one drum, boilers with water walls, or others where the construction is such that circulation of water may follow more than one path or cycle.

For more information, see <a href="http://www.maddenmfg.com/orificeOP.htm">http://www.maddenmfg.com/orificeOP.htm</a> Received on Wed Jul 26 18:17:00 2000