1. Case: Turretstyle, bottom connection, threaded ring, blowout disc in rear. 2. Dial: 200 mm (8 inch) minimum diameter, noncorrosive, black markings on white background. 3. Measuring Element: Bourdon tube designed for steam service. 4. Movement: Stainless steel, rotary. 5. Pointer: Micrometer adjustable, black color. 6. Window: Laminated safety or plastic. 7. Accuracy: One half percent of the full span. 8. // 0 - 2000 kPa // 0 300 psi // gage. 9. Installation: Stop valve, steel piping, valved blowdown, siphon, union at gauge, valved connection for inspector's gauge. Refer to Detail, FIRETUBE BOILER. D. Water Level Safety and Operating Controls and Indicators: 1. Provide high and low water warning alarms, primary and auxiliary low water burner cutoffs, automatic electronic modulating feedwater level control system, gage glass. a. High and low water warning alarms shall operate bell and separate high and low water level indicating lights on boiler control panel and shall not shut down the burner. b. Primary and auxiliary low burner cutoff devices shall be in two separate water columns, piped individually to the boiler water spaces. One device shall be float-type, the other device shall be conductivity probes. Primary and auxiliary cutoffs shall require manual reset. Auxiliary cutoff shall shut down power to the burner management system. Non-latching shunt switches shall allow blowdown of water columns without shutting down the burner. c. Water level set points for all devices shall be as recommended by boiler manufacturer. d. Water level control system shall maintain the water level within limits established by boiler manufacturer for normal water level with no tripping of high and low level alarms with instantaneous load swings of 25 percent of boiler capacity. Feedwater pump will operate continuously. e. Refer to Section 23 09 11, INSTRUMENTATION and CONTROL FOR BOILER PLANT for detailed operation of all indication, monitoring, alarm and control devices.
1. Case: Turretstyle, bottom connection, threaded ring, blowout disc in rear. 2. Dial: 200 mm (8 inch) minimum diameter, noncorrosive, black markings on white background. 3. Measuring Element: Bourdon tube designed for steam service. 4. Movement: Stainless steel, rotary. 5. Pointer: Micrometer adjustable, black color. 6. Window: Laminated safety or plastic. 7. Accuracy: One half percent of the full span. 8. // 0 - 2000 kPa // 0 300 psi // gage. 9. Installation: Stop valve, steel piping, valved blowdown, siphon, union at gauge, valved connection for inspector's gauge. Refer to Detail, FIRETUBE BOILER. D. Water Level Safety and Operating Controls and Indicators: 1. Provide high and low water warning alarms, primary and auxiliary low water burner cutoffs, automatic electronic modulating feedwater level control system, gage glass. a. High and low water warning alarms shall operate bell and separate high and low water level indicating lights on boiler control panel and shall not shut down the burner. b. Primary and auxiliary low burner cutoff devices shall be in two separate water columns, piped individually to the boiler water spaces. One device shall be float-type, the other device shall be conductivity probes. Primary and auxiliary cutoffs shall require manual reset. Auxiliary cutoff shall shut down power to the burner management system. Non-latching shunt switches shall allow blowdown of water columns without shutting down the burner. c. Water level set points for all devices shall be as recommended by boiler manufacturer. d. Water level control system shall maintain the water level within limits established by boiler manufacturer for normal water level with no tripping of high and low level alarms with instantaneous load swings of 25 percent of boiler capacity. Feedwater pump will operate continuously. e. Refer to Section 23 09 11, INSTRUMENTATION and CONTROL FOR BOILER PLANT for detailed operation of all indication, monitoring, alarm and control devices.
VA235239.docx