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DL/T 2027-2019: (Guidelines for the ordering and acceptance of steam traps in thermal power plants)
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(Guidelines for the ordering and acceptance of steam traps in thermal power plants)
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DL/T 2027-2019
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Basic data | Standard ID | DL/T 2027-2019 (DL/T2027-2019) | | Description (Translated English) | (Guidelines for the ordering and acceptance of steam traps in thermal power plants) | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F20 | | Word Count Estimation | 14,133 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Regulation (derived from) | Natural Resources Department Announcement No. 7 of 2019 | | Issuing agency(ies) | National Energy Administration | DL/T 2027-2019: (Guidelines for the ordering and acceptance of steam traps in thermal power plants)
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Guideline of order and acceptance for drain valves in thermal power plant
ICS 27.100
F 23
Record number. 63143-2018
People's Republic of China Electric Power Industry Standard
Guidelines for ordering and acceptance of traps in thermal power plants
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Preface...1
1 Scope...2
2 Normative references...2
3 Order...3
3.1 General requirements...3
3.2 Technical requirements...3
3.3 Order Scope...5
4 Acceptance...6
4.1 General requirements...6
4.2 Manufacturing Supervision...6
4.3 Factory acceptance...7
4.4 Unpacking acceptance...7
4.5 Preliminary acceptance...7
4.6 Final acceptance...7
Appendix A...11
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation".
Appendix A of this standard is an informative appendix.
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction and interpretation of the Power Plant Valve Standardization Technical Committee of the Power Industry.
Drafting organizations of this standard. Wuhan Huake Energy Environmental Technology Co., Ltd., Shaanxi Yihao Technology Development Co., Ltd., Guangzhou Haofeng
Fluid Engineering Technology Co., Ltd., Nafushi (Shanghai) Valve Technology Co., Ltd., Jiangsu Yuda Power Station Auxiliary Valve Manufacturing Co., Ltd., Zhejiang
Jiang Baolong Valve Manufacturing Co., Ltd., Henan Huayu Shengda Special Equipment Testing Technology Co., Ltd., China Power Engineering Consulting Group Northwest Power
Design Institute Co., Ltd.
The main drafters of this standard. Zhang Chuanhu, Liu Jianmin, Wang Yuanhang, Yang Heng, Dai Langcai, Li Zhiqiang, Tang Huifeng, Lu Huancheng, Chen Haidong.
This standard is issued for the first time.
The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of China Electricity Council (No. 2 Baiguang Road, Beijing)
One, 100761).
Guidelines for ordering and acceptance of traps in thermal power plants
1 Scope
This standard specifies requirements for ordering and acceptance of steam traps for thermal power plants.
This standard is applicable to ball valves and globe valves for drainage of thermal power plants with a nominal size of DN15～DN100 and a nominal pressure not greater than PN760.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GB/T 1221 Heat-resistant steel bar
GB/T 3766 Hydraulic actuator
GB/T 4622 spiral wound gasket
GB/T 6394 Method for determination of average grain size of metals
GB/T 7932 pneumatic actuator
GB/T 10561 Determination of the content of non-metallic inclusions in steel, grading chart, microscopic inspection method
GB/T 12221 flange connection metal valve structure length
GB/T 12223 Part-turn valve drive connection
GB/T 12224 General requirements for steel valves
GB/T 12228 General Valve Carbon Steel Forging Technical Conditions
GB/T 14383 Forged socket welding and threaded pipe fittings
GB/T 14992 Classification and designation of high temperature materials for high temperature alloys and intermetallic compounds
GB/T 24922 Explosion-proof valve electric device technical conditions
GB/T 24923 Technical requirements for ordinary valve electric devices
GB/T 26480 Inspection and testing of valves
GB 26640 Specification for minimum wall thickness of valve housing
DL/T 439 Technical Guidelines for High Temperature Fasteners in Thermal Power Plants
DL/T 531 Technical conditions of high temperature and high pressure stop valve for power station
DL/T 869 Welding technical specification for thermal power plant
JB/T 6439 Magnetic particle inspection of die-cast steel parts of valves
JB/T 6902 valve liquid penetration test
JB/T 6903 Ultrasonic Inspection Method for Valve Forgings
JB/T 7370 flexible graphite braided packing
JB/T 12000 Technical requirements for pressure-bearing steel forgings for thermal power supercritical and ultra-supercritical valves
JB/T 12387 High temperature and high pressure ball valve for power station
NB/T 47008 Carbon steel and alloy steel forgings for pressure equipment
NB/T 47010 stainless steel and heat-resistant steel forgings for pressure equipment
NB/T 47044 Power Station Valve
3 order
3.1 General requirements
3.1.1 A manufacturing unit that holds a special equipment pressure piping component manufacturing license and the license conforms to the product should be selected for ordering.
3.1.2 The purchaser shall provide the supplier with a detailed description of the project overview and product operating environment when placing an order.
3.1.3 The product ordering data sheet should be filled in when placing an order. See Appendix A for the product ordering data sheet. The order data in Table A.1 is filled in by the design institute,
The buyer, the supplier and other related parties jointly complete it.
3.2 Technical requirements
3.2.1 The overall requirements for the design and manufacture of traps should meet the requirements of NB/T 47044, and the design and manufacture of traps should meet DL/T
According to the regulations of 531, the drain ball valve should meet the regulations of JB/T 12387.
3.2.2 The pressure and temperature ratings of the traps should meet the requirements of GB/T 12224.
3.2.3 The structural length dimension of the trap should meet the requirements of GB/T 12221, or be negotiated by both the supplier and the buyer.
3.2.4 The trap shall be connected by socket welding or butt welding. The socket welding connection end shall meet the requirements of GB/T 14383; the butt welding connection end shall conform to the
Comply with the provisions of GB/T 12224, or be negotiated by both parties.
3.2.5 For all pressure-bearing shells in contact with the medium, the corrosion allowance caused by the corrosion of the medium to the metal shall be considered, and the minimum wall thickness shall comply with GB 26640
Provisions.
3.2.6 The hardened material of the sealing surface is high temperature resistant hard alloy.
3.2.7 The surface hardness of the sealing surface material of the ball valve sphere and valve seat is ≥HRC60, and the surface hardness of the sealing surface material of the stop valve disc and the valve seat ≥HRC40.
3.2.8 Corresponding hardening treatment measures should be taken on the surface of the valve stem to ensure that there is a hardness difference of 50HB between the surface of the valve stem and the valve stem guide sleeve.
3.2.9 The valve stem bushing should have a structure to prevent the valve stem from escaping and the valve stem is positioned radially. The valve stem should be designed to prevent blowing out.
3.2.10 The packing structure should adopt at least one ring of flexible graphite packing braided with stainless steel wire or corrosion-resistant alloy wire at the top and bottom, and the middle is placed
Forming flexible graphite pressure ring packing.
3.2.11 The stuffing box of the high pressure drain ball valve shall be equipped with a metal anti-extrusion ring.
3.2.12 For traps with pressure self-sealing structure with DN≤50, the sealing ring should be a metal sealing ring.
3.2.13 The valve electric device shall meet the requirements of GB/T 24922 and GB/T 24923.
3.2.14 The connection size of the valve drive device should meet the requirements of GB/T 12223.
3.2.15 The design of pneumatic actuators should meet the requirements of GB/T 7932.
3.2.16 The design of hydraulic actuators should meet the requirements of GB/T 3766.
3.2.17 When the working temperature of the valve is higher than.200℃, heat insulation design should be adopted between the actuator and the valve to keep the temperature of the parts of the actuator
Does not exceed 80°C.
3.2.18 Each valve must undergo a shell strength test, and the valve shell shall not have permanent deformation and structural damage; the valve shell wall and any fixed
There must be no visible leakage at the valve body connection.
3.2.19 Each valve shall undergo a sealing test, and the maximum allowable leakage rate of the sealing surface shall be in accordance with GB/T 26480.
3.2.20 The materials of the trap parts shall be suitable for use during the thermal power generation drainage conditions and their rated pressure and temperature. To be able to prevent steam
It can be damaged by corrosion, impact, etc., and its service life can meet the requirements of thermal generating sets.
3.2.21 The material of pressure-bearing parts shall comply with the material designation, heat treatment method and maximum use temperature specified in "Table 1 Commonly used materials for pressure-bearing parts".
The chemical composition and mechanical properties of the materials should meet the requirements of the standards listed in Table 1.It can also be used with temperature and mechanical properties not lower than those listed in Table 1.
It material.
3.2.22 The materials of main parts such as valve stems, spheres, valve seats, springs, self-tightening metal rings, bolts/nuts, etc. shall meet the requirements of “Table 2
"Material" specifies the grade of material, the maximum use temperature, and the chemical composition and mechanical properties of the material should meet the requirements of the standards listed in Table 2.Also
Other materials whose temperature and mechanical properties are not lower than those listed in Table 2 can be used.
3.2.24 The selection of valve materials shall meet the requirements of the following relevant standards, and the chemical composition, mechanical properties and quality reports of the materials shall be provided.
a) Carbon steel forgings should meet the requirements of GB/T 12228;
b) Alloy steel and stainless steel forgings should meet the requirements of NB/T 47008 and NB/T 47010;
c) The technical conditions of pressure-bearing steel forgings for thermal power supercritical and ultra-supercritical parameter valves should meet the requirements of JB/T 12000;
d) Flexible graphite braided packing should meet the requirements of JB/T 7370;
e) Spiral wound gaskets should meet the requirements of GB/T 4622.
3.3 Order scope
3.3.1 The ordering scope of traps includes. valve body, actuator and accessories, spare parts, documents and related services. Specific Fan
The scope is negotiated by the supply and demand parties.
3.3.2 If the material of the trap valve body is different from that of the pipe, the transition pipe should be included in the order. The transition pipe should be in line with the pipe material and groove
The form is the same, and the welding with the valve body is completed in the manufacturing plant.
3.3.3 Except for special requirements of the buyer, spare parts for traps include. sphere, disc, packing, sealing ring, and gasket. Number of spare parts
The quantity is negotiated between the supplier and the demander.
4 Acceptance
4.1 General requirements
1.1.1 4.1.1 Each trap product shall undergo factory acceptance and on-site acceptance. On-site acceptance includes unpacking acceptance, preliminary acceptance and final inspection.
Final acceptance.
1.1.2 4.1.2 The purchaser shall check the relevant quality inspection documents, technical documents and relevant standards in accordance with the acceptance outline, test outline, product drawings, etc.
Product acceptance.
1.1.3 4.1.3 The product shall be inspected by the purchaser or a third party with qualifications entrusted by the purchaser during the entire manufacturing process before the factory acceptance.
Implement manufacturing supervision.
1.1.4 4.1.4 After the product is manufactured, the manufacturer shall complete the factory inspection under the supervision and witness of the purchaser or a third party.
Sign acceptance opinions.
1.1.5 4.1.4 After the product arrives at the buyer's site, the buyer organizes and invites the manufacturer and the third party to participate to jointly complete the on-site acceptance.
4.1.5 The performance test items and requirements of the shell test, sealing test and action test at each stage of the product shall be in accordance with Table 4; product materials,
The inspection items and requirements for welding, non-destructive testing, appearance, and dimensions shall be in accordance with Table 5; the inspection and acceptance items of product documents shall be in accordance with Table 6.
The quality inspection records and reports provided by the supplier shall be true, accurate, complete and valid, with complete signatures, and affixed with official seals or special inspection seals.
4.1.6 Acceptance personnel, acceptance equipment and instruments, and acceptance methods shall comply with the requirements of relevant standards or technical documents.
4.2 Manufacturing supervision
4.2.1 When there are manufacturing supervision requirements in the order contract, the manufacturer shall notify the manufacturing supervision party in advance, and the supervision personnel appointed by the manufacturing supervision party shall arrive at the time of the supervision
Carry out supervision and acceptance on the production site.
4.2.2 The manufacturing supervisor shall supervise and inspect the quality control inspection points, quality inspection reports and records of the equipment manufactured by the manufacturer, and shall be responsible for summarizing
Sort out the documents and other materials formed during the manufacturing supervision, and issue an acceptance report and sign after the completion of the supervision.
4.2.3 The main processes of manufacturing supervision and the types of manufacturing supervision points are in accordance with Table 3.
4.3 Factory acceptance
4.3.1 After the factory commissioning of the product is completed, the supplier shall notify the purchaser of the factory acceptance of the product.
4.3.2 The factory acceptance items and requirements of the products shall be in accordance with the provisions in Table 4 to Table 5.
4.3.3 After the factory acceptance is completed, both the supplier and the buyer shall sign and seal the product acceptance report.
4.4 Unpacking acceptance
4.4.1 The product is shipped to the site. Before installation, the purchaser shall notify the supplier to go to the site for unpacking and acceptance.
4.4.2 The purchaser shall carefully check the names of products, spare parts and accessories, spare parts and special tools according to the product supply list (packing list).
Weigh, model specifications, quantity, check the appearance quality, confirm that the specifications and quantities of each part are accurate, and the appearance is intact.
4.4.3 Check the product quality certificate, product instruction manual and other random materials. The materials should be correct and complete.
4.4.4 Product unpacking acceptance items shall be in accordance with Table 4 and Table 5.
4.4.5 After the unpacking acceptance is completed, both the supplier and the buyer shall sign and seal the product unpacking acceptance record.
4.5 Preliminary acceptance
4.5.1 After the product has been installed on-site, the product that has passed the on-site debugging will undergo preliminary acceptance during the trial operation of the system.
4.5.2 The preliminary acceptance items and requirements of the product shall be in accordance with the regulations in Table 4 and Table 5.The whole machine runs smoothly, without abnormal vibration, and the product performance index reaches
To the specified value.
4.5.3 The purchaser shall fill in the preliminary acceptance summary form and sign the preliminary acceptance certificate.
4.6 Final acceptance
4.6.1 After the expiration of the quality assurance period, the purchaser shall make the final acceptance of the product.
4.6.2 The final acceptance items shall meet the requirements of continuous and stable operation of the unit according to the regulations in Table 4 and Table 5, and the product performance indicators shall reach
The specified value.
4.6.3 The demander fills in the final acceptance summary form and signs the final acceptance certificate.
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