1 Scope
This standard specifies the content and technical requirements of chemical supervision in the basic construction stage of power generation and thermal equipment.
This standard is applicable to units with rated pressure of 12.7 MPa and above for thermal equipment in thermal power plants. Units with rated pressure lower than 12.7 MPa may be implemented with reference.
2 Normative references
The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced documents (including any amendment) applies.
GB/T 7596 In-service quality criteria of turbine oils used in power plants
GB 8978 Integrated wastewater discharge standard
GB 12145 Quality criterion of water and steam for power plant and steam-generating equipment
GB/T 14541 Guide for maintenance and supervision of in-service mineral turbine oil used for power plants
DL/T 246 Guideline of chemical supervision
DL/T 300-2011 Guideline for anti-corrosion and anti-fouling of condenser tube in power plant
DL/T 561 Guide for chemical supervision of water and steam in thermal power plant
DL/T 571 Guide for acceptance, in-service supervision and maintenance management of fire-resistant fluid used in power plants
DL/T 712 Guideline for the selection of condenser tube materials in power plant
DL/T 794 Guideline for chemical cleaning of fossil plant
DL/T 801 Requirements for internal cooling water quality and it's system in large generators
DL/T 855 The code for maintenance and safe keeping of thermal power equipment in electric power construction
DL/T 912 Quality criterion of water and steam for supercritical pressure units in fossil fuel power plant
DL/T 956 Guideline for lay-up of thermal power equipment in fossil plants
DL 5190.3 Technical specification for thermal power erection and construction — Part 3: steam turbine generator unit
DL 5190.5 Technical specification for thermal power erection and construction — Part 5: Piping and system
3 General
3.1 The chemical supervision of thermal equipment in thermal power plants in the capital construction stage shall meet the general requirements of DL/T 246 for chemical supervision of thermal power plants.
3.2 The chemical supervision of thermal equipment in thermal power plants in the capital construction stage shall be organized by the owner or the unit entrusted by the owner, with the participation of the owner unit, the construction unit, the supervision unit, the commissioning unit and other units.
3.3 The owner unit shall participate in the quality acceptance of important projects such as boiler hydraulic test, boiler chemical cleaning, steam pipe blowing, unit trial operation and 168 h complete trial operation. All supervision tasks shall be included in the project schedule, and their implementation shall be taken as one of the bases for assessing and evaluating the project quality.
3.4 The owner unit is responsible for organizing the collection and collation of chemical technical supervision and inspection reports in the capital construction stage of thermal equipment, and archiving them as the basic data of the unit.
Foreword i
1 Scope
2 Normative references
3 General
4 Ex-factory inspection and requirements
5 On-site storage and supervision
6 Installation and hydrostatic test
7 Chemical cleaning
8 Water flushing before starting the whole set of units
9 Steam blowing
10 Start-up and commissioning of the whole set of units
11 Anti-rust protection
