What are the rules for chemical cleaning of low pressure boilers
Release time：2018-08-29 Browse：678
Article 1 to prevent the chemical cleaning of the boiler from jeopardizing the safe operation of the boiler, to ensure the safety and reliability of the chemical cleaning of the boiler, and to improve the cleaning effect. .
Article 2 This rule uses a fixed steam boiler and pressure-bearing heat at a rated outlet steam pressure of less than 2.45MP (25kgf/cm2). Chemical cleaning of water boilers.
The chemical cleaning of the 3rd boiler includes both alkaline cooking and pickling. Cleaning can be combined with soaking, recirculating cleaning, and soaking and reversing cleaning.
The fourth boiler water treatment is an important measure to ensure the safe and economic operation of the boiler. It is not allowed to replace or relax the regular and effective water treatment work with chemical cleaning. . The pickling time of each boiler should not be less than two years.
The 5th boiler chemical cleaning professional unit must obtain the qualification approval of the provincial and above (including provincial) labor part boiler pressure vessel safety supervision organization. Professional units for boiler chemical cleaning should have the following prerequisites:
1. Have a sound organization and obtain legal personality.
2. There are professional and technical staff who are suitable for the chemical cleaning work undertaken.
The cleaning unit responsible for cleaning the Class C boiler should have at least one intermediate technical staff member and two junior technical staff. Units that qualify for Class C boiler cleaning can undertake chemical cleaning of boilers below Class C. The cleaning unit responsible for cleaning boilers of Class D and below shall have at least one intermediate technical staff or two junior technical staff.
3. The cleaning and testing staff should agree with the boiler and pressure vessel safety supervision agency at or above the municipal level (including city level).
4. Complete and safe cleaning equipment and analytical tools.
5. Have a sound governance system and develop safe handling procedures.
Units that meet the above premise can pickle the boiler by themselves after approval by the local labor department. Units that only perform soda cooking do not require qualification.
Before the chemical cleaning of the 6th boiler, the chemical cleaning unit must formulate a cleaning plan and, with the approval of the technical person in charge, report to the local and municipal level where the boiler is located. The labor part of the boiler pressure vessel safety supervision agency shall be implemented after the deposit.
Article 7 Boiler and Pressure Vessel Safety Supervision Agency shall inspect and monitor the qualification and cleaning quality of the cleaning unit in accordance with these Rules. Chemical cleaning premise and preparatory work.
Chemical cleaning can only be carried out if the 8th boiler meets one of the following conditions:
1. The heating surface of the boiler is covered by scale by more than 80% and the uniform scale thickness reaches or exceeds the following values.
For boilers without superheater: 1mm,
For boilers with superheater: 0.5mm,
For hot water boilers: 1mm.
2. There is significant oil or rust on the heating surface of the boiler.
Before Article 9 cleaning, specific inspections should be carried out inside and outside the boiler to determine the cleaning method and safety measures.
