Are there industry regulations for the daily maintenance of boiler level gauges?

This post was last edited by gjn1970 on 2016-1-3 at 16:39. For small units operating at pressures below high pressure levels, the following guidelines can be followed: 1. Glass tube water level gauges – Their working principle is the same as that of a communicating vessel; the water level shown by the gauge corresponds to the actual water level in the boiler drum. During normal operation, the steam valve and water valve are open, while the drain valve is closed. If the steam valve is not opened and only the water valve is opened, the pressure inside the boiler drum will be higher than that inside the glass tube; as a result, the water level in the glass tube will necessarily be higher than the actual water level in the boiler drum, creating an apparent water level. If the water valve is not opened and only the steam valve is opened, the continuous condensation of steam causes the glass tube to fill with water, thereby also creating a false water level. II. Two-color water level gauge: 1. Utilizing optical principles, this gauge displays colorless water and steam within it in different colors (red and green), making the boundary between water and steam clear and visible; thus, it is possible to accurately determine the water level from a distance using a camera. 2. Use and maintenance of the dual-color water level gauge: ① The dual-color water level gauge is an optical instrument, and it must not be struck forcefully. ②After installation, wait for the water level gauge to warm up before use. ③The new water gauge should be cleaned before it is put into use. ④If a leak is detected at the seal surface of the water gauge, the screws should be tightened, applying even force in a crosswise manner. ⑤Depending on the degree of corrosion of the glass, replace it to prevent accidents caused by sudden breakage due to corrosion. ⑥The gaskets of water level gauges and the valve bushings can suffer from wear, corrosion, and aging due to long-term use, and should be replaced regularly. III. Daily inspection of the water level gauge: ① The glass should be kept clean at all times; if contamination is evident and it cannot be cleaned by wiping, it should be replaced. ②If the boiler water quality is good, it can be flushed once a week on a regular basis. ③Pay attention to the operating status of each valve (steam valves and water valves should be open) ； The drain valve is closed) to prevent false water levels. IV. Flushing of the water level gauge: When flushing, wear protective gloves, do not face the water level gauge directly, and move slowly to prevent the glass tube from breaking due to sudden changes in temperature and causing injury. 1. Flushing of the glass tube water level gauge: ① Open the water valve. ② Close the water valve, then open it again. ③ Close the steam valve, then open it again. ④ Close the drain valve. 2. How to put the dual-color water level gauge into use after flushing: ① Close the steam valve and the water valve. ② Open the water valve to drain water, then close the drain valve. ③ Slightly open the water valve and the steam valve. ④ Gradually open the water valve and the steam valve alternately until they are fully open. 5. Replacement of the water level gauge’s glass tube: ① Wear a protective mask and gloves; turn sideways, close the water valve first, then the steam valve, to avoid being scalded by boiling water and steam. ②Gently loosen the upper and lower caps, remove the broken glass tube, and clear out any filler debris from the groove. ③Place the new glass tube vertically and slowly tighten the upper and lower gland screws, but be careful not to tighten them too much to avoid preventing the glass tube from expanding due to heat. ④Open the steam valve slightly for preheating; once moisture appears inside the pipe, open the drain valve, then increase the opening of the steam valve slightly. After that, gradually close the drain valve while increasing the opening of both the steam and water valves, so that the water level gauge can function properly. For units operating at ultra-high pressures and above, in addition to the regulations mentioned above, the following provisions shall also be followed: 1. \"Technical Specifications for Boiler Drum Water Level Measurement Systems in Thermal Power Plants DRZ/T 01-2004\" ； 2. **Several Provisions on the Configuration, Installation, and Use of the Water Level Measurement Systems for Power Plant Boilers, issued by the power company.**

Thank you. Are there any requirements regarding electric contact level gauges and differential pressure level gauges? Please give me some advice.

1. “Technical Specifications for the Water Level Measurement System of Boilers in Thermal Power Plants DRZ/T 01-2004”； 2. **Several Provisions on the Configuration, Installation, and Use of the Water Level Measurement Systems for Power Plant Boilers, issued by the power company.** The above provisions include