Standard No.:	GB 50041-2020
English Name:	Standard for design of boiler plant
Chinese Name:	锅炉房设计标准
Professional Classification:	GB    National Standard
Issued by:	MOHURD and SAMR
Issued on:	2020-01-16
Implemented on:	2020-7-1
Status:	valid
Superseding:	GB 50041-2008 Code for design of boiler plant
Language:	English
File Format:	PDF
Word Count:	35000 words
Price(USD):	990.0
Delivery:	via email in 1 business day

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is jointly revised by China United Engineering Corporation Limited in conjunction with relevant design and research units in accordance with the requirements of the Notice on printing and distributing the development and revision plan on engineering construction standards and codes in 2015 (JIANBIAO [2014] No. 189) issued by the Ministry of Housing and Urban-Rural Development of the People's Republic of China. During the process of revising this standard, the drafting group, after extensive investigation and careful summarization of practical experience, with reference to relevant international and foreign advanced standards and based on widely soliciting opinions, has finalized this standard through repeated discussions, modifications and improvements. The main technical contents of this standard are: general provisions, terms, basic requirements, boiler plant layout, coal system, fuel oil system, fuel gas system, boiler air and flue gas system, boiler feed water equipment and water treatment, hot water preparation for heating, monitoring and control, chemical analysis and overhaul, boiler plant piping, thermal insulation and anti-corrosion, civil engineering, electrical, heating and ventilation, water supply and drainage, environmental protection, fire-fighting, outdoor thermal piping, etc. The main technical contents revised in this standard are as follows: 1 the applicable capacity of hot water boiler is extended from 0.7~70MW to 0.7~174MW; 2 the contents of other standards that need to be cited are adjusted according to the latest version of relevant standards, and a large number of clauses directly cited from other standards are deleted; 3 GB 50041-2008 Code for design of boiler plant (hereinafter referred to as the former standard) has specified the layout position of boiler plant. At present, the units and some regions for which this standard is adopted have proposed that the layout position of dependent boiler plant should be more flexible. In this revision, combined with the current national standard GB 50016-2014 Code for fire protection design of buildings, the original clauses are basically remained, but the "must not" thereof is changed to "shall not"; 4 the requirements related to some products or technologies with low efficiency and high energy consumption, such as spreader stoker boilers and bubbling bed boilers are deleted; contents related to condenser boilers, high-efficiency pulverized coal boilers and climate compensation devices are added; 5 with the improvement of the air pollutant emission limit of boiler plants in China, the technologies of dust removal, desulfurization and denitration have also developed accordingly. In this revision, the contents of environmental protection clauses have been greatly adjusted and expanded to meet the existing environmental protection requirements; for coal storage, the concept of close area of coal is put forward to meet the requirements of environmental protection; 6 the lower limit of boiler capacity with automatic control is lowered and the monitoring parameters of boilers are added; relevant requirements of industrial television are added; 7 the specific requirements in the former standard on the layout position of centralized instrument control room are canceled, and the requirement that "large observation window with sound insulation glass shall be adopted towards the boiler operation surface" is deleted. The provisions printed in bold type in this standard are compulsory and must be enforced strictly. The Ministry of Housing and Urban-Rural Development is in charge of this standard and the explanation of the compulsory provisions, China Machinery Industry Federation is responsible for the routine management, and China United Engineering Corporation Limited is responsible for the explanation of specific technical contents. During the process of implementing this standard, the relevant opinions and advices, whenever necessary, can be posted or passed on to China United Engineering Corporation Limited (Address: No.1060 Bin'an Road, Binjiang District, Hangzhou; 310052; E-mail address: zhangjp@chinacuc.com). Standard for design of boiler plant 1 General provisions 1.0.1 This standard is formulated with a view to enabling the design of boiler plant to meet the requirements of energy conservation, environmental protection, safe production, advanced technology, economic rationality and quality assurance. 1.0.2 This standard is applicable to the design of industrial, civil and regional boiler plants and their outdoor thermal piping within the following scope: 1 the boiler plant of steam boilers, for single boiler therein, the rated evaporating capacity is 1~75t/h, the rated outlet steam pressure is 0.10~3.82MPa (gauge pressure), and the rated outlet steam temperature is less than or equal to 450℃; 2 the boiler plant of hot water boilers, for single boiler therein, the rated thermal power is 0.7~174MW, the rated outlet water pressure is 0.10~2.50MPa (gauge pressure), and the rated outlet water temperature is less than or equal to 180℃; 3 the outdoor steam piping, condensate piping and closed hot water circulation system which meet the parameters in Items 1 and 2 of this article. 1.0.3 This standard is not applicable to the design of boiler plants and urban heating pipe networks for waste heat boilers, waste incineration boilers and other special types of boilers. 1.0.4 In addition to this standard, the design of boiler plant shall also comply with those stipulated in the current relevant national standards. 2 Terms 2.0.1 boiler plant complex of boiler as well as auxiliary equipment and facilities ensuring the normal operation of boiler 2.0.2 industrial boiler plant boiler plant provided and owned by the enterprise, which aims at meeting the heat (steam and hot water) requirements of the enterprise 2.0.3 living boiler plant boiler plant for supplying people with heat (steam) for living   2.0.4 regional boiler plant boiler plant serving certain region, within which, several building facilities such as enterprises, civil buildings and public buildings are arranged 2.0.5 independent boiler plant boiler plant with no structural connection with other buildings around it 2.0.6 dependent boiler plant boiler plant adjacent to or arranged in other buildings 2.0.7 underground boiler plant boiler plant located underground 2.0.8 semi-underground boiler plant boiler plant with the underground height below the ground exceeding 1/3 the net height of the boiler room but not exceeding the height of the boiler room 2.0.9 basement boiler plant boiler plant arranged in other buildings, with the height of boiler room floor below the outdoor floor by more than 1/2 the net height of the boiler room 2.0.10 semi-basement boiler plant boiler plant arranged in other buildings, with the height of boiler room floor below the outdoor floor by more than 1/3 but not more than 1/2 the net height of the boiler room 2.0.11 outdoor thermal piping outdoor thermal piping of boiler plant owned by enterprise within its scope, and that within the boundary of regional boiler plant 2.0.12 piping piping that consists of pipe components, pipe supports and hangers, etc., which is used to transport, distribute, mix, separate, discharge, measure or control fluid flow 2.0.13 piping system a group of pipings formed by connecting a plurality of pipings divided according to fluid and design conditions 2.0.14 year-round steam (heat) supply year-round steam (heat) supply by boiler plant to heat consumers, which cannot be cut off, otherwise it will lead to life danger or great economic loss of relevant personnel 2.0.15 boiler room place where the boiler body is installed 2.0.16 auxiliary room all places other than boiler room, where auxiliary machines and auxiliary equipment are installed and production operations are conducted, such as water treatment room, fan room, water pump room, machine repair room, laboratory, instrument control room, etc. 2.0.17 service room place for employees to live or work, such as duty room, rest room, office, private bathroom, toilet, etc. 2.0.18 duty room place for workers to change and store clothes at the commuter time 2.0.19 rest room place for workers to rest at the work shift for boiler plant under two- or three-shift system 2.0.20 operation feed water pump feed water pump normally used for boiler during operation 2.0.21 standby feed water pump pump that feeds water to a boiler when the operation feed water pump fails 2.0.22 emergency feed water pump feed water pump (usually steam driven) used to prevent the boiler from water shortage accident when the electric feed water pump stops in case of power failure 2.0.23 net distance distance between the outer edges of the most prominent adjacent parts of two objects 2.0.24 relative density ratio of gas density to air density 2.0.25 close area of coal closed warehouse for storing coal and preventing coal dust from escaping, which shall be provided with devices or facilities for timely discharging combustible gas outdoors 3 Basic requirements 3.0.1 The design of boiler plant shall be carried out according to the approved urban (regional) or enterprise overall planning and heating planning, so as to combine long-term and short-term considerations, for which, priority is given to the near future and room for expansion should be reserved; for the design of expanded and reconstructed boiler plant, the original data of original process equipment and piping shall be obtained, and the original buildings, structures, equipment and piping shall be rationally utilized, meanwhile, they shall be coordinated with the layout of original production system, equipment and piping as well as the types of buildings and structures. 3.0.2 For the design of boiler plant, data of heat load, fuel and water quality shall be obtained, and relevant basic data of local meteorology, geology, hydrology, electricity and water supply shall also be obtained. 3.0.3 The selection of fuel for boiler plant shall make rational use of energy and save energy, and be coordinated with safe production, economic benefits and environmental protection. The selected fuel shall be provided with data such as its origin and elemental composition analysis as well as corresponding fuel supply agreement, and shall meet the following requirements: 1 the fuel used for boiler plants arranged in other buildings shall be fuel gas or fuel oil, but should not be heavy oil or residual oil; 2 the backup fuel of gas boiler plant shall be determined according to the safety and significance of heating system, the assurance degree of fuel gas supply and the possibility of backup fuel. 3.0.4 For underground, semi-underground, basement and semi-basement boiler plants, liquefied petroleum gas or gas fuel with relative density greater than or equal to 0.75 is strictly prohibited. 3.0.5 For the design of boiler plant, effective measures shall be taken to reduce the impact of waste gas, waste water, solid waste residue and noise on the environment, and the discharged harmful substances and noise shall meet the requirements of national emission standards. 3.0.6 The heat load required by the region shall be determined according to the heating planning of the city (region) where it is located. When one of the following conditions is met, a regional boiler plant shall be arranged: 1 when the heating and domestic heat load of residential areas and public building facilities are outside the supply scope of thermal power station; 2 when the consumers have small production, heating, ventilation and domestic heat load, the load is unstable and the number of annual service hours is small, or cogeneration conditions are unavailable due to reasons such as site and capital; 3 when transitional heating, which may be used as peak shaving or standby heat source for thermal power stations in the future, is required according to the urban heating planning and consumers' requirements for early heat utilization. 3.0.7 The capacity of boiler plant shall be determined according to the design heat load. The design heat load should be calculated and determined after drawing the heat load curve or heat balance system diagram, and taking into account various heat losses, self-consumed heat of boiler plant and available waste heat. 3.0.8 When the boiler plant is equipped with a steam accumulator, its design capacity shall be calculated and determined according to the heat load after balance. 3.0.9 The selection of boiler heating medium shall meet the following requirements: 1 hot water should be taken as the heating medium of boiler in the boiler plant for heating, ventilation, air conditioning and domestic heat; 2 steam shall be taken as the heating medium of boiler in the boiler plant mainly for producing steam; 3 after technical and economic comparison, steam, hot water or steam and hot water may be selected as the heating medium of boiler in the boiler plant for production, heating, ventilation, air conditioning and domestic heat simultaneously. 3.0.10 The selection of boiler heating medium parameters shall meet the following requirements: 1 the selection of steam pressure and temperature for production shall meet the requirements of production process; 2 the design water supply temperature and return water temperature of hot water heating network shall be determined after technical and economic comparison according to the specific conditions of the project by combining factors such as boiler plant, pipe network, heating station and heat consumer secondary heating system. 3.0.11 In addition to the requirements of 3.0.9 and 3.0.10 of this standard, the selection of boiler shall also meet the following requirements: 1 the boiler shall be able to effectively burn the fuel, have higher thermal efficiency and adapt to the change of heat load; 2 the boiler shall be helpful to environmental protection; 3 the boiler shall be able to reduce infrastructure investment and reduce operation & management costs; 4 the boiler shall have higher degree of mechanization and automation; 5 the structure of the boiler shall be adoptive to the seismic fortification intensity in this region; 6 in addition to the above requirements of this article, the oil and gas boilers shall also meet the requirements of fully automatic operation and be equipped with reliable combustion safety protection devices. 3.0.12 The number and capacity of boilers shall be determined according to the design heat load after technical and economic comparison, and shall meet the following requirements: 1 the number and capacity of boilers shall ensure that all boilers shall meet the requirements of the maximum design heat load of the boiler plant when operating at rated evaporating capacity or heat power; 2 the number and capacity of boilers shall ensure that the boilers can operate in lower or higher heat load operation conditions, that rated evaporating capacity or thermal power, boiler efficiency and other operation performances shall be adaptive effectively to heat load changes; the operating conditions of boiler units during the low peak period of heat load throughout the year shall be considered; 3 the total number of boilers in the boiler plant should not exceed 5 for newly-built boiler plants, not exceed 7 for expanded and reconstructed boiler plants and not exceed 4 for dependent boiler plants; 4 if one of the boilers in the boiler plant with the highest rated evaporating capacity or thermal power is overhauled, the other boilers shall meet the following requirements: 1) the lowest heat load for continuous production heat; 2) the lowest heat load for HVAC and domestic heat. 3.0.13 When building a boiler plant in a region with seismic fortification intensity of 6 or above, measures conforming to the seismic fortification standards of the region shall be taken for the design of buildings, structures and pipings.

Foreword i 1 General provisions 2 Terms 3 Basic requirements 4 Boiler plant layout 4.1 Location selection 4.2 Arrangement of buildings, structures and sites 4.3 Arrangement of boiler room, auxiliary room and service room 4.4 Process layout 5 Coal system 5.1 Coal facilities 5.2 Storage and transportation of coal, ash and limestone 6 Fuel oil system 6.1 Fuel oil facilities 6.2 Storage and transportation of fuel oil 7 Fuel gas system 8 Boiler air and flue gas system 9 Boiler feed water equipment and water treatment 9.1 Boiler feed water equipment 9.2 Water treatment 10 Hot water preparation for heating 10.1 Hot water boiler and auxiliary facilities 10.2 Hot water preparation facilities 11 Monitoring and control 11.1 Monitoring 11.2 Control 12 Chemical analysis and overhaul 12.1 Chemical analysis 12.2 Overhaul 13 Boiler plant piping 13.1 Steam and water piping 13.2 Fuel oil piping 13.3 Fuel gas piping 14 Thermal insulation and anti-corrosion 14.1 Thermal insulation 14.2 Anti-corrosion 15 Civil engineering, electrical, heating and ventilation, water supply and drainage 15.1 Civil engineering 15.2 Electrical 15.3 Heating and ventilation 15.4 Water supply and drainage 16 Environmental protection 16.1 Prevention and control of atmospheric pollution 16.2 Prevention and control of noise and vibration 16.3 Wastewater treatment 16.4 Solid waste treatment 16.5 Greening 17 Fire-fighting 18 Outdoor thermal piping 18.1 General requirements 18.2 Piping system 18.3 Piping arrangement and laying Annex A Net distance between outdoor thermal piping or trenches and buildings, structures, roads, railways or other piping Explanation of wording in this standard List of quoted standards