[Energy people are watching, click on the upper right corner to add 'Follow']
North Star Water Treatment Network News:North Star Water Treatment Network learned that the Zhejiang Provincial Department of Housing and Urban-Rural Development solicited opinions on the "Guidelines for the Construction and Maintenance of Sterilization Equipment for Rural Domestic Sewage Treatment Facilities (Draft for Comments)". This guideline is applicable to the construction and maintenance of sterilization facilities of rural domestic sewage treatment terminals. The details are as follows:
Notice on soliciting opinions on the "Guidelines for the Construction and Maintenance of Sterilization Equipment of Rural Domestic Sewage Treatment Facilities (Draft for Comments)"
Municipal Construction Committees (Construction Bureaus), Shaoxing and Wenzhou Comprehensive Law Enforcement Bureaus, and all relevant units:
According to the requirements of the "Notice on Issuing the Preparation Plan for the Operation and Maintenance of Rural Domestic Sewage Treatment Facilities in 2017" (Jianban Village [2017] No. 163), our department commissioned Zhejiang Wenyuan Environmental Protection Technology Co., Ltd. to prepare the "Guidelines for the Construction and Maintenance of Rural Domestic Sewage Treatment Facilities (Draft for Comments)" and is now soliciting opinions and suggestions from all regions. Please provide feedback to the preparation unit before April 15.
Contact: Xu Hongmei, He Qili
Contact number: 15381048493 15906635156
Fax: 0571-86691556
Email: [email protected]@qq.com
Address: 9th Floor, Building E1, Zhejiang University Forest, Zijin Chuangchuang Town, Xihu District, Hangzhou City
Attachment: "Guidelines for the Construction and Maintenance of Sterilization Equipment of Rural Domestic Sewage Treatment Facilities" (draft for soliciting opinions).docx
Zhejiang Provincial Department of Housing and Urban-Rural Development
April 3, 2020
Guidelines for the Construction and Maintenance of Sterilization Equipment of Rural Domestic Sewage Treatment Facilities (draft for soliciting opinions)
Preface
In order to implement the rural revitalization strategy, in accordance with the overall deployment of "ecological livability", "two riches and two beautiful", "two high-level" Zhejiang and "five water co-governance", in accordance with the spirit of the document "Opinions of the General Office of the People's Government of Zhejiang Province on Strengthening the Operation and Maintenance Management of Rural Domestic Sewage Treatment Facilities" (Zhejiang Government Office [2015] No. 86), in order to ensure the normal operation of rural domestic sewage treatment sterilization facilities, effectively control the transmission of pathogenic microorganisms through water bodies, and improve the quality of rural water environment, the preparation team has standardized the technical requirements for the construction and maintenance of sterilization equipment in rural domestic sewage treatment terminals after extensive investigation and research, carefully summarized practical experience, and on the basis of extensive soliciting opinions, it has standardized the technical requirements for the construction and maintenance of sterilization equipment in rural domestic sewage treatment terminals, and formulated this guideline.
This guideline is divided into 8 chapters. The main contents include: general rules, terms, basic regulations, facility construction, facility maintenance, safety matters, normative citation documents, and descriptions of the terms used by this guideline.
1 General
1.0.1 This guideline is formulated to standardize the construction and maintenance of sterilization facilities in rural domestic sewage treatment terminals, ensure the normal operation of sterilization facilities, continue to play the role of reducing pollutant emissions, effectively control the transmission of pathogenic microorganisms through water bodies, and improve the rural water environment.
1.0.2 This guideline is applicable to the construction and maintenance of sterilization facilities of rural domestic sewage treatment terminals.
1.0.3 The construction and maintenance of sterilization facilities of rural domestic sewage biological treatment terminals should not only comply with these guidelines, but also comply with the requirements of the current relevant standards and regulations of the state, province and local governments.
2 The term
2.0.1 Sterilization
refers to a measure that uses strong physical and chemical factors to make the pathogenic microorganisms in rural domestic sewage bodies partially or all of them lose their ability to grow and reproduce forever.
2.0.2 Ultraviolet sterilization facility Ultraviolet sterilization facility
refers to a cavity and container that can be irradiated with ultraviolet rays. It is usually composed of components sealed in the container such as ultraviolet lamp , quartz casing, ballast, ultraviolet intensity sensor, cleaning system, etc.
2.0.3 times sodium chlorate sterilization facility Sodium hypochlorite sterilization facility
refers to a device in which sodium hypochlorite solution is added to a water body to react to the sterilization effect.
2.0.4Ozone Sterilization facilityOzone sterilization facility
refers to a special device that can produce ozone. Ozone destroys the structure of microbial membranes by the oxidation of oxygen atoms to achieve bactericidal effect.
2.0.5 Chlorine dioxide Sterilization facility Chlorine dietide sterilization facility
refers to a facility where chemical reactions can be used to generate the main product chlorine dioxide and used for sterilization.
2.0.6 Ultraviolet disinfection Ultraviolet disinfection
After pathogenic microorganisms absorb ultraviolet energy with wavelengths between 200nm and 280nm, their genetic material (nucleic acid) mutations cause cells to no longer divide and reproduce, achieving the purpose of disinfection and sterilization, that is, ultraviolet disinfection.
2.0.7 low pressure lamp Low pressure lamp1
Mercury steam lamp works at an internal pressure of 0.13Pa to 1.33Pa. The input electric rate is about 0.5W per centimeter arc length, the output power of sterilization ultraviolet energy is about 0.2W per centimeter, and the sterilization ultraviolet energy is output at a single spectrum of 253.7nm wavelength.
2.0.8 UV effective dose of equipment Reactor effective dose
UV disinfection equipment can achieve microbial inactivation UV dose.
2.0.9 Comprehensive maintenance
refers to a detailed maintenance of the equipment. The main work content includes: checking whether each component of the equipment is intact, checking the sealing of the equipment, checking the sterilization effect of the equipment, and checking whether the equipment's working voltage, working power matches the rated voltage, rated power, etc.
3 Basic regulations
3.0.1 When treating rural domestic sewage, sterilization facilities should be set up in front of the outlet well (hole). The number of fecal coliform bacteria in the outlet water should comply with the "Standards for Water Pollutants Discharge of Rural Domestic Sewage Treatment Facilities" (DB33/973).
3.0.2 The construction unit shall build sterilization facilities in accordance with the requirements of this guideline and relevant national and industry requirements, and organize acceptance as required.
3.0.3 Operation and maintenance units shall carry out the operation and maintenance of sterilization facilities in accordance with the requirements of this guideline, implement relevant systems of the current national, provincial and local laws, standards and regulations. At the same time, they shall formulate management systems such as operation and maintenance procedures, safety operating procedures and job responsibilities of operation and maintenance personnel in various types of sterilization facilities, and implement them conscientiously.
3.0.4 Operation and maintenance units should configure corresponding operation and maintenance service capabilities in accordance with the "Regulations on the Evaluation and Management of Third-Party Operation and Maintenance Service Capacity of Rural Domestic Sewage Treatment Facilities". Professional operation and maintenance personnel who are familiar with the operation requirements of sterilization equipment should be equipped with sufficient inspection, maintenance, repair and protective tools for the operation and maintenance of facilities.
3.0.5 Operation and maintenance personnel of the operation and maintenance unit should only be able to take up their posts through technical training and production practice. Special jobs should be certified to work. Operation and maintenance personnel should earnestly perform their job responsibilities and strictly abide by rules and regulations.
3.0.6 Operation and maintenance personnel should do a good job in the operation and maintenance ledger records and management, and the content of the ledger should clearly reflect the operating status of the sterilization facilities. The data on the operation and maintenance results of sterilization equipment should be recorded, analyzed and submitted to the owner unit regularly.
3.0.7 Operation and maintenance units should cooperate with the competent department to dynamically monitor the information of terminal facilities included in the information management platform. When the information changes, they should promptly report to the competent department for review and update.
3.0.8 Before accepting sterilization facilities, the operation and maintenance unit should carefully check the appearance of the equipment, equipment condition, rationality of process and technical parameters, and the compliance of the water inlet and outlet indicators.
3.0.9 The deactivation, re-activated or scrapped sterilization facilities shall be carried out in a timely manner in accordance with relevant regulations.
3.0.10 Operation and maintenance units should formulate emergency plans for the operation of sterilization facilities and should have corresponding emergency solutions for emergencies of technology and safety accidents.
4 Facilities Construction
4.1 Process selection
4.1.1 UV disinfection and sterilization facilities have good effect, short reaction time, high safety, and simple construction, but high requirements for incoming water turbidity, and the lamp tube needs to be replaced regularly.
4.1.2 The sodium hypochlorite sterilization facility has good sterilization effect, stable use, high safety, long reaction time, and large maintenance efforts.
4.1.3 Ozone sterilization facilities have good sterilization effect and can remove odors, but they are not safe to use, have more equipment, have large maintenance efforts, and have high investment.
4.1.4 The chlorine dioxide sterilization facility has good sterilization effect, the source of raw materials is not easy to prepare, and there are safety hazards for use.
4.2 Technical requirements
4.2.1 UV sterilization facility
(1) When ultraviolet disinfection is used, the irradiation dose and irradiation contact time should be determined through test or similar engineering operation experience. When there is no reference to the data, the irradiation dose can be 15 mJ/cm2~22 mJ/cm2, and the irradiation contact time should be greater than 10s.
(2) The ultraviolet dosage calculation of the equipment must take into account the scaling coefficient of the ultraviolet lamp sleeve.
(3) The selection of ultraviolet disinfection equipment includes the type of disinfector, the type of ultraviolet lamp, the life of ultraviolet lamp, the arrangement of ultraviolet lamps, the number of modules, cleaning methods, etc.
(4) UV disinfection equipment adopts a low-pressure lamp system, which is suitable for low-flow water treatment systems. The output power of a single UV lamp is 15W-40W.
(5) UV disinfection equipment All cables connecting UV lamps and rectifiers should be in the frame of the UV module, and cables exposed to sewage should be coated with teffron.
(6) The continuous operation or cumulative operating life of the ultraviolet disinfection equipment shall not be less than 6000h.
(7) The water inlet suspension (SS) of ultraviolet disinfection equipment should not exceed 20mg/L.
4.2.2 Sodium hypochlorite sterilization facility
(1) A tube filter is installed at the entrance of the dosing metering pump to prevent large particulate solid substances from entering the metering pump and damage the metering pump. The filter screen needs to be observed in time. If there is any blockage, clean it up in time.
(2) The equipment is not used for a long time. The vent valve should be opened to drain the residual liquid in the system. The equipment was cleaned with clean water, and the metering pump was put in the tank for 20 minutes. Then empty the system.
4.2.3 Ozone sterilization facility
(1) The frequency of the power supply is 50Hz±1Hz, the voltage is 220V±22V, the atmospheric pressure is 86kPa~106kPa, the relative humidity; 65%~85%, the temperature is room temperature; the air outlet temperature should be
(2) The ozone concentration output by the closed ozone sterilization facility should be ≥12mg/L.
(3) When the above conditions change, the corresponding discharge (corona discharge or glow discharge) unit area ozone yield, concentration, yield, power consumption and other indicators should be measured according to the specific circumstances.
(4) All electrically insulated parts in ozone sterilization facilities should meet the requirements of high-voltage insulation performance and structural; insulated parts in glow discharge and ozone oxidation environments should also meet the requirements of GB9706.1.
(5) If water is used as coolant, the cooling water consumption per kilogram of ozone should not exceed 1.5×103kg.
(6) The average life span should be ≥20000h; the cumulative working time without faults should be ≥8000h.
4.2.4 Chlorine dioxide sterilization facility
(1) The structure of the sterilization facility should include: raw material supply system, reaction system, absorption system, measurement control system and safety system.
(2) Raw material requirements: According to the reaction principle, the purity and purpose of the final product should be selected with chemical raw materials of corresponding specifications and purity. The raw materials used should comply with GB/T 534, GB 338, GB/T 1618, GB 1616, HG/T 3250, GB 320, GB/T 8269, GB 2440, GB 317 or corresponding national standards and hygiene safety requirements.
(3) The sterilization facility should have safety measures and automatic protection functions, and the machine should be shut down when the failure occurs.
(4) The raw material conveying should adopt an accurate metering device, and the alarm should be stopped when the metering device is abnormal; under normal working conditions, the continuous fault-free service life should not be less than 8000h.
(5) The appearance of the sterilization facility should not have any defects such as scratches, wrinkles, bubbles, missed coating or sand particles. The surface of the coating should be flat and bright, with uniform color and a firm coating.
4.3 Construction precautions and key points
Pipeline engineering, concrete structure engineering, masonry engineering and structure construction should comply with the relevant provisions of the current national standards "Hydrome and drainage Pipeline Engineering Construction and Acceptance Specifications" GB50268, "Hydrome and drainage Concrete Structure Engineering Construction Quality Acceptance Specifications" GB50204, "Hydrome and drainage structuring construction quality acceptance specifications" GB50203 and "Hydrome and drainage structure Engineering Construction and Acceptance Specifications" GB50141.
4.3.1 UV sterilization facilities
(1) UV sterilization equipment and its connecting pipes and valves should be firmly fixed, and the UV sterilizer shall not bear the weight of the pipelines and accessories.
(2) sterilizer should be installed strictly in accordance with the direction of water in and out.
(3) The installation of the sterilizer should be easy to disassemble, maintenance and maintenance, and no materials that affect water quality and sanitation shall be used at all pipe connections.
(4) It is not easy to install the UV disinfector device on the outlet pipe close to the water pump to prevent the "water hammer" phenomenon when the pump is stopped, thereby damaging the quartz glass tube and lamp tube.
(5) When installing the ultraviolet sterilizer, sufficient operating distance should be reserved.
(6) If the disinfection equipment is not used for a long time, please place it in a dry and rain-proof place.
4.3.2 Sodium hypochlorite sterilization facility
(1) Fix the dosing device as required and place it on a fixed and flat foundation.
(2) Connect the dosing device, then check each flange interface and tighten it to avoid fluid leakage.
(3) Connect the power supply to the metering pump: Turn on the electrical control cabinet junction box and connect the three-phase and four-wire power line that meets the requirements of the metering pump motor to the corresponding terminal.
(4) The motor steering is instantly started by controlling the operation switch. If the steering is correct, fix the junction box. If the steering is incorrect, adjust the phase sequence and fix the junction box.
4.3.3 Ozone sterilization facility
(1) Fix the dosing device as required and place it on a fixed and flat foundation.
(2) Do not place flammable objects nearby.
(3) Do not install it in an environment containing explosive gas.
(4) It is strictly forbidden to install it in situations where water droplets may splash.
(5) It is strictly forbidden to install it in an environment of metal powder or dust.
(6) Do not install in environments with humidity greater than 80%. When installing
(7), it should be located where it can fully withstand the weight of the ozone generator. When installing
(8), do not cause the device to be impacted and vibrated.
(9) Only when the input power supply is completely disconnected can the wiring work be performed.
(10) The grounding end of the ozone sterilization facility must be reliably grounded before use.
(11) The door must be locked before starting the machine.
(12) When powered on, do not touch the generator box with wet hands.
(13) Do not operate the ozone sterilization facility with wet hands.
4.3.4 Chlorine dioxide sterilization facility
(1) When installing chlorine dioxide sterilization facilities, exhaust fans should be installed at the bottom of the equipment partition wall to maintain good ventilation.
(2) The equipment should be installed indoors to avoid direct sunlight. The ambient temperature of the equipment must be above 10℃.
(3) The place where the equipment is installed must ensure that the necessary lighting facilities and the corresponding power supply for the pile foundation capacity of the equipment must be ensured.
(4) It should be avoided to be placed in the same room as other electrical appliances, and a separate equipment room should be set up.
(5) The chlorine dioxide injection pipe, that is, the PVC chemical pipe or water supply pipe with an outer diameter of 110mm should be embedded two, and the injection pipe should not climb high.
4.4 Acceptance
4.4.1 If civil engineering is involved, the quality acceptance of civil engineering projects shall comply with the relevant provisions of the current national standards "Concrete Structure Engineering Construction Quality Acceptance Specifications" GB50204, "Masonry Engineering Construction Quality Acceptance Specifications" GB50203 and "Water Supply and Drainage Structure Engineering Construction and Acceptance Specifications" GB50141, etc.
4.4.2 The acceptance content of the equipment installation project includes inspection of the stand-alone installation status and the equipment linkage trial operation. Acceptance and the equipment trial operation status table should be filled out. The overall requirements should comply with water quality emissions.
5 Facilities Maintenance
5.1 Daily Maintenance
5.1.1 UV Sterilization Facilities Maintenance
(1) The cleaning method is mainly manual cleaning, and other cleaning methods are selected according to actual needs.
(2) When manually cleaning the glass sleeve, you should wear rubber gloves and protective glasses.
(3) The cleaning frequency shall not be less than 1/200h. In principle, ensure that the biofilm generated on the surface of the lamp is cleaned in time.
(4) The lamp tube that has reached its service life should be replaced in time.
(5) Maintenance personnel should record the maintenance situation in a timely manner, conduct a detailed analysis of the abnormal situations found during maintenance and report to the company.
5.1.2 Sodium hypochlorite sterilization facility maintenance
facility lubricating oil needs to be replaced after initial operation of 250 hours. After that, replace the lubricant every 2500 hours or every month, check the one-way check valve and diaphragm every 6 months, and decide whether to replace it based on actual use.When the ambient temperature is -5℃, the lubricant is Mobil Super Gear Oil 600×p220, and when the ambient temperature is -5℃ to -10℃, the winter lubricant Mobil Super Gear Oil 600×p68 should be replaced and maintained weekly.
5.1.3 Ozone sterilization facility maintenance
(1) The sewage valve at the lower end of the air storage tank after the air compressor must be discharged once every two hours of work. When the work is stopped, the sewage should be closed immediately after discharge.
(2) The sewage valve at the lower end of the oxygen gas storage tank should be discharged once a day after working.
(3) The sewage discharge outlet at the lower end of the ozone generating chamber should be discharged once at the end of each work.
(4) Regularly clean the dust in the control cabinet and on the pipelines. Clean the dust of the whole machine, high-voltage transformer and electrical cabinet once a month.
(5) The high voltage electrode of the discharge chamber should be inspected regularly and maintained once every six months.
(6) The catalyst usage effect should be checked regularly and the catalyst should be replaced in time.
(7) The air compressor, dryer, pre-cooler, ozone generator, etc. should be maintained every month;
(8) The ozone contact and exhaust gas absorption facilities should be cleaned at least once a year and painted iron parts once a year.
5.1.4 Chlorine dioxide sterilization facility maintenance
(1) The temperature display should not exceed 70°C. Set it once, and do not adjust it at will.
(2) The flow regulating valve, raw material pipeline and water sprayer are prone to clogging when the raw material contains impurities. Pay attention to cleaning and unblocking, and the sediment in the raw material tank should be cleaned frequently.
(3) Collect waste liquid and solid waste generated after cleaning or wiping the facilities, and shall not be discarded near the terminal at will.
(4) Maintenance personnel should record the maintenance situation in a timely manner, conduct a detailed analysis of the abnormal situations found during maintenance and report to the company.
5.2 Daily inspection
5.2.1 Basic requirements
(1) Daily inspections of sterilization facilities should be conducted regularly and in a timely manner.
(2) On-site inspection personnel should record the inspection results in a timely manner, conduct a preliminary analysis of the abnormal situations found in the inspection and report to the company. If major situations such as damage to sterilization facilities, mechanical and electrical equipment failures, etc., resulting in sterilization failure to operate normally, the operation and maintenance company should immediately report to the competent department.
5.2.2 UV sterilization facilities
should inspect the concentration of suspended substances in the water inlet of the facility, whether the flow device and lamp tube are intact, and whether there are electricity leakage, water leakage, etc. The inspection holes of the sterilization well are sealed and firm to prevent humans and animals from falling into it. The sterilization well should be observed for abnormal conditions such as leakage, floating, settlement, inclination, and damage and water leakage of the connecting pipes. It is necessary to inspect whether there are a large amount of mycelium, floc and sand deposits in the UV sterilization box. The electrical modules of the ultraviolet sterilization facility must be inspected, including visual inspection of components being damp, water inlet and multimeter to check whether the current and voltage are normal.
5.2.3 Sodium hypochlorite sterilization facility
should inspect whether the tank of the facility is leaking, whether the device is water and electricity normally, whether the medicine liquid enters the sterilization tank normally, and whether the metering pump is idle.
5.2.3 Ozone sterilization facilities
should patrol whether there is water accumulation in the air compressor and air storage tank of the facilities, whether the freeze dryer, suction dryer, gas storage tank, water chiller, ozone generator system, ozone power system, closed-circuit cooling system, and control system are operating normally, whether the ambient air dust is normal, whether the oxygen generator is damp or water inlet, whether the water level of the cooling water tank is normal, and whether there is leakage.
5.2.4 Chlorine dioxide sterilization facilities
should patrol whether the explosion-proof opening of the facility is blocked before starting the machine, and ensure that the explosion-proof opening is in the open state. Before starting the machine, check whether the water bath water replenishment valve is open and confirm whether the tap water in the water bath is sufficient. After the dosing pump stops working during shutdown, the equipment should be operated for another 30 minutes before the water inlet can be turned off. When the machine is shut down, the heater should be turned off.
5.3 Maintenance
5.3.1 Maintenance personnel should promptly repair the sterilization facility operation failure
(1) When repairing the ultraviolet disinfection equipment, please do not look directly at the ultraviolet lamp with your eyes, and wear an ultraviolet-proof mask and glasses when turning on the light.When it is found that the lamp tube is not lit, replace it in time. When replacing, turn off the power supply of the lamp tube module first, wear clean cotton gloves with both hands to operate. Pay attention to holding and putting it gently during the process, and sealing the quartz casing.
(2) The maintenance of sodium hypochlorite sterilization facilities must be professionals to replace parts. Power must be cut off when repairing damaged parts and equipment. The safety valve does not discharge liquid or the rated displacement is insufficient, the metering accuracy is reduced, the transmission reducer vibration and noise must be repaired according to the instructions provided by the manufacturer.
(3) The maintenance of ozone sterilization facilities must be professionals to replace parts. When repairing damaged parts and equipment, it is strictly forbidden to leave wire heads or metal objects in the equipment, otherwise there is a risk of damage to the equipment. During the discharge chamber, pay attention to observe the discharge status of each enamel tube from the seal head. If abnormal ignition or no discharge will affect the system ozone production and concentration, it should be handled in time. The power supply and the generator are both high voltage. The power supply should be turned off during maintenance to ensure safety. If a failure occurs, it should be stopped and sent to the relevant unit for repair.
(4) The generator, metering pump, valve, explosion-proof plug and other damaged parts of the chlorine dioxide sterilization facility are replaced and repaired. The maintenance operation must be carried out according to the instructions provided by the manufacturer.
5.3.2 Abnormal situations such as leakage, settlement, inclination and damage to the connecting pipes are caused by water leakage. The solution should be proposed in a timely manner and reported to the competent unit, and repaired in a timely manner after approval by the competent department.
5.3.3 Maintenance personnel should record the maintenance situation in a timely manner, conduct a detailed analysis of major faults found during maintenance, and report them to the competent department by the company.
5.4 Detection
5.4.1 It should be sampled regularly for inspection and dynamically monitor the processing capacity of the sterilization facility.
5.4.2 Laboratory test results should be recorded, analyzed and reported in a timely manner.
6 Safety matters
6.1. Safety management of the procurement, transportation, storage and use of drugs and items related to sterilization facilities should be carried out in accordance with relevant regulations and requirements.
6.2 During the operation and maintenance process, staff in various technical positions such as electricians and maintenance workers should pass the technical training before they can take up their posts. Special operations personnel must be certified to take up their posts.
6.3 On-site operators should strictly follow the operating procedures and wear the prescribed labor protection supplies.
6.4 Operating units should formulate safety emergency plans such as power outages, equipment failures, typhoons, heavy rainstorms and other natural disasters, and report to the competent department.
7 Normative reference file
The terms in the following files become the terms of this guideline by reference. For reference documents with dates, only the versions of the dates are applicable to this standard. Any referenced documents that do not have dates, their latest version (including all modifications) applies to this Guidelines.
"Technical Specifications for Rural Domestic Sewage Treatment" DB33/T868-2012
"Technical Specifications for Rural Domestic Pollutants Control" HJ574
"Technical Guidelines for Water Pollutants Control Engineering" HJ2015
"Technical Guidelines for Environmental Engineering Technical Specifications" HJ526
Zhejiang Province "Water Pollutants Emission Standards for Rural Domestic Sewage Treatment Facilities" (DB33/973)
"Urban Water Supply and Drainage UV Disinfection Equipment" GB/T 19837
"Safety and Hygiene Standards for Chlorine Dioxide Disinfectant Generators" GB28931
"Safety and Hygiene Standards for Ozone Generators" GB 28232
8 Instructions on the terms of this guideline
In order to facilitate different treatment when implementing the provisions of this guideline, the words with different requirements of strictness are explained as follows:
(1) means very strict, words that must be done:
positive words use "must", and negative words use "strictly forbidden";
(2) means strict, words that should be done in normal circumstances:
positive words use "should", and negative words use "not" or "no";
(3) means slightly selective, words that should be done first when conditions permit:
positive words use "optional", and negative words use "not appropriate";
(4) means that there is a choice, and the words that can be done under certain conditions use "can". When the
clause specifies that it should be implemented in accordance with other relevant standards and specifications, the writing method is: "It should comply with the provisions of..." or "It should be implemented according to...".
Disclaimer: The above content is reprinted from Polaris Electric Power News Network, and the content posted does not represent the position of this platform.
National Energy Information Platform Contact number: 010-65367702, Email: [email protected], Address: People's Daily, No. 2, Jintai West Road, Chaoyang District, Beijing
