The ASME Boiler and Pressure Vessel Code Section I establishes the requirements for steam drum water level measurement in fired steam drums. The primary focus of these requirements is safe boiler operation. Maintenance, performance, and other specific application issues are not addressed. There are a dozen or more level technologies that could be considered for this application.
On a steam raising boiler there are three clear applications for level monitoring devices: Level control - To ensure that the right amount of water is added to the boiler at the right time. Low water alarm - For safe boiler operation, the low water alarm ensures that the combustion of fuel does not continue if the water level in the boiler has dropped to, or below a predetermined level.
Gems Sensors, manufacturer of the industry respected Warrick Line of boiler control systems, developed this article to help those within the boiler industry understand the codes that cover boiler safety controls. The days of temperamental boiler control systems have all but passed.
Jan 01, 2008 · The objective of a boiler-drum level-control strategy is to provide a continuous mass/heat balance by replacing every pound of steam leaving a boiler with a pound of feedwater, thus maximizing the quality of the steam leaving the boiler. Level-Control Strategies. Depending on load variations and the size of a boiler, one of three principal level-control strategies typically is employed: single element, two
Effective Boiler-Level Control | HPAC Engineering
low level water (LW), and as a maximum limiter for highlevel water (HW), the "guided radar" measurement method permits accurate and reliable pointlevel detection in the steam boiler since it is not affected by changes in density. Furthermore, the same instrument can be used for continuous control (water level controller) and as a visual indicator (water