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Engineering Construction Standard Full Text Information System
CJ/T3084—1999
Oil-fired Shell and Tube Water Heaters
Shell and tube water heaters (oil burning) Construction Standard
1999-07-28 Issued
1999-12-01 Implementation
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
CJ/T3084—1999
This standard is compiled on the basis of referring to the technical requirements of similar products abroad and combining the domestic production practice experience for many years.
This standard is proposed by the Standard and Quota Research Institute of the Ministry of Construction. This standard is under the jurisdiction of the Water Supply and Drainage Product Standardization Technical Committee of the Ministry of Construction. This standard is drafted by Guangxi Liuzhou Electric Complete Set Factory and Guangxi Building Comprehensive Design Institute.
The main drafters of this standard are Xi Daping, Qu Shenyou, Xiao Ruishu, Xu Zhian, Xu Jianhua and Liu Zongqiu.
This standard is entrusted to Guangxi Liuzhou Electric Appliance Complete Set Factory and Guangxi Building Comprehensive Design Institute for interpretation.
Engineering Construction Standard Full Text Information System
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Engineering Construction Standard Full Text Information System
Urban Construction Industry Standard of the People's Republic of China Oil-fired Shell and Tube Water Heaters
Shell and tube waterheaters (oil burning) 1 Scope
CJ/T3084—1999
This standard specifies the terms, models and specifications, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of oil-fired shell and tube water heaters (hereinafter referred to as water heaters).
This standard applies to oil-fired shell and tube water heaters with water as the medium. The heat medium water prepared by it can directly heat the water in the hot water storage tank (box) by hand, or indirectly heat the water in the tank (box) through a water-to-water volumetric heat exchanger for use in the domestic hot water pipe network. When used in heating systems, a high-pressure heat exchange coil can be added to the water-to-water heat exchanger to compensate for heat loss.
2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB/T700—1988 Carbon structural steel
GB/T983—1995
Stainless steel welding rod
6 Low-pressure boiler water quality
GB1576—1996
GB/T3280—1984 Stainless steel cold-rolled steel plate Approved by the Ministry of Construction of the People's Republic of China on July 28, 1999 Engineering Construction Standard Full Text Information System
1999-12-01 Implementation
Engineering Construction Standard Full Text Information System
GB/ T3768—1996
Determination of sound power level of noise source by sound pressure method
Simplified method of using envelope measurement surface above the irradiation surfaceGB/T4237—1984
GB/T5117—1995
GB5749—1985
Hot-rolled stainless steel plate
Carbon steel welding rod
Sanitary standard for drinking water
GB/T8163—1987
GB9486—1988
Transportation Seamless steel pipe for fluid
Steady-state exhaust smoke density of diesel engine and its determination method GB/T13384—1992
General technical conditions for packaging of electromechanical products
GB/T14957—1994
GB/T14958—1994
GB/T14975—1994
GB/T14976—1994
Steel wire for fusion welding
Steel wire for gas shielded welding
Stainless steel seamless steel pipe for structure
Seamless stainless steel pipes for fluid transmission
4Nondestructive testing of pressure vessels
JB4730—1994
YB/T5092—1996
6Stainless steel wire for welding
3Terms
3.1Shell and tube water heaters are composed of burners, heat exchangers, electrical control systems, etc., and use shell and tube heat exchange to provide heat sources for domestic hot water and heating systems. Medium water of heat transmission3.2
Medium water for circulating heat supply in shell and tube water heaters. 3.3Steady state of operationThe operating condition of the shell and tube water heater in which the burner is normally ignited and supplies heat source water within the set temperature range.
4 Model and Specifications
4.1 Model Composition
The model consists of three parts, each of which is connected by a short horizontal line and a slash. 2
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Engineering Construction Standard Full Text Information System
The fuel type is oil
Water inlet temperature, ℃
Mountain water set temperature, ℃
Shell static water pressure, MPa
Heat exchange coil pressure, MP0
Heat exchange mode: SR indicates water-water heat exchange
Heat supply, Mw
Combustion mode code:
Type code
S indicates room combustion
4.1.1 The first part of the model indicates the type of hot water unit, combustion mode (see Table 1), rated heat supply and heat exchange mode.
4.1.2 The second part of the model indicates the medium parameters, which is divided into two sections, connected by a slash in the middle. 4.1.3
The third part of the model indicates the type of fuel.
Table 1 Type of hot water unit
Vertical water pipe
IS (vertical water)
Example 1: LHS0.35-0.098-Y
Vertical fire tube
LH (vertical fire)
Horizontal external combustion
wW (horizontal external)
Horizontal internal combustion
WN (horizontal internal)
Indicates vertical fire tube indoor combustion, heating capacity is 0.35MW, shell static water pressure is 0.098MPa, outlet water set temperature can be adjusted arbitrarily within the range of 6095℃, fuel hot water unit.
Example 2: WNS0.35-0.098-Y
indicates combustion in a horizontal internal combustion chamber, with a heat supply of 0.35MW, a static water pressure of 0.098MPa at the water outlet, and an outlet water setting temperature that can be adjusted arbitrarily within the range of 60-95℃, a fuel oil hot water unit.
Example 3: WNS0.70SR-
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1.60/95/70-Y
Engineering Construction Standard Full Text Information System
indicates combustion in a horizontal internal combustion chamber, with a heat supply of 0.70MW, a water-water heat exchange method, a shell static water pressure of 0.098MPa, a heat exchange coil pressure of no more than 1.60MPa, an outlet water setting temperature of 95℃, a return water setting temperature of 70℃, a fuel oil hot water unit. 4.2 Specifications and main technical parameters of hot water units 4.2.1 The main technical parameters of each series of hot water units are shown in Table 2. Table 2 Main technical parameters of hot water units
0.05-0.098-Y
0.10-0.098-Y
0.15-0.098-Y
0.18-0.098-Y
0.21-0.098-Y
0.26-0.098-Y
0.35-0.098-Y
0.4 2-0.098-Y
0.50-0.098-Y
0.70-0.098-Y
1.00-0.098-Y
1.20- 0.098-Y
1.40-0.098-Y
2.10-0.098-Y
2.80-0.098-Y
4.20-0.098-Y
Rated heating
Amount Rated fuel consumption Heated water flow volume Hydrostatic pressure Rated voltage Thermal efficiency m/n
1 Use No. 0 diesel.
2 Calculate the heated water flow MPa by taking 50℃ as the temperature rise and 85% as the thermal efficiency
Test pressure
380/220
(50 Hz)
Oil engine
Group is pressure
force atomization
Micro positive pressure
4.2.2 The main technical parameters of WNSSR or WWSSR series hot water units used in heating and other systems are shown in Table 3.
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Engineering Construction Standard Full Text Information System
Main Technical Parameters of WNSSR or WWSSR Series Hot Water Units Table 3
Coal Water Mountain Water
Rated Heating Supply Stimulus Rated Oil Consumption Acid Water Flow Heat Exchange Coil Undertaken Topic Rated Electricity Heat Efficiency Fuel Car
/Return Water Temperature
23-:060-
0.65:/95/70
0.50SR0%/ 95/70
0.70SR:0/95/70
1.00R9:0%/95/70
1.205R0:0%/95/70
.405R-1:0/95/0-
0:06/0-
2.805R0:0/95/70
4.205R:0%/95/0
Use No. 0 diesel.
2Temperature rise of 25°C and thermal efficiency of 85% are used to calculate the heated water flow rate 5 Technical requirements
Working pressure
1.25 times the main
Working pressure transfer
Test
380/220
(50He)
5.1The hot water unit shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures.
5.2Usage environment of hot water unit
5.2.1The ambient temperature of the indoor device shall not be higher than 40°C, and its average temperature within 24 hours shall not be higher than 35°C and shall not be lower than 5°C. 5.2.2It is suitable to be installed in a place with clean air and no other flammable or explosive materials. 5.2.3The unit room shall comply with the requirements of the "Code for Fire Protection Design of Buildings" and the maximum storage capacity of the daily oil tank matched with the unit shall not be greater than 1m. 5.3 Appearance and structure of hot water unit
5.3.1 The paint layer on the surface of the product should be beautiful, uniform and firm, and should not peel or flake off. 5
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
5.3.2 The installation and layout of the electrical control system and electrical components should be safe and reliable, easy to operate and easy to maintain.
5.3.3 The hot water unit should have sufficient strength, rigidity, stability and corrosion resistance. 5.3.4 The structure of the hot water unit should be convenient for installation, maintenance and cleaning. 5.3.5 The inlet and outlet of the hot water unit should be equipped with a thermometer, and a pressure gauge should be installed on the top of the body for easy observation. The installation of the above instruments should comply with relevant regulations. 5.3.6 A hole should be opened at the highest point of the hot water unit body, and it should be ensured to be directly connected to the atmosphere. The equivalent diameter of the hole should not be less than the value calculated by formula (1).
Da=20+88VQ
Where: D——Equivalent diameter of opening, mm, Q Rated heating capacity of hot water unit, MW.
5.4 Manufacturing materials of hot water unit
5.4.1 The materials, welding rods and welding wires used for the heating surface of the hot water unit shall have quality certificates. 5.4.2 The steel used for the hot water unit shall comply with the provisions of GB/T700 not less than Q235 and the provisions of GB/T8163, GB/T3280, GB/T4237, GB/T14975 and GB/T14976.
5.4.3 The welding rods used for the welding materials of the hot water unit shall comply with the provisions of GB/T5117 and GB/T983, and the welding wires shall comply with the provisions of GB/T14957, GB/T14958 and YB/T5092.
5.5 Welding of hot water unit
5.5.1 Welders shall receive technical training and obtain pressure vessel welder license. Weld size shall comply with the requirements of drawings and process documents. 5.5.2 The weld height of the welded workpiece shall not be lower than the parent material, and shall have a smooth transition with the parent material. There shall be no cracks, arc pits or undercuts exceeding 0.5mm deep on the weld surface and heat-affected zone surface.
5.5.3 The shortest length of the joint between the combustion chamber and the shell shall not be less than 300mm, and there shall be no more than two longitudinal welds on the shell.
5.5.4 The smoke pipe hole shall not be opened on the weld.
Engineering Construction Standard Full Text Information System
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Engineering Construction Standard Full Text Information System
5.6 Water Pressure Test of Hot Water Unit
Before insulation, the hot water unit shall be subjected to a water pressure test, the test pressure is 0.2MPa, the test pressure of the water-water volumetric heat exchanger used in the domestic hot water system is 1.25 times the working pressure: the water-water heat exchanger used in heating and other systems, the shell test pressure is 0.2MPa, the heat exchange coil test pressure is 1.25 times the working pressure, and the working pressure should not exceed 1.6MPa.
5.7 Electrical Performance of Hot Water Unit
5.7.1 Insulation Resistance: The insulation resistance between the power input terminal and the ground (shell) should be not less than 2MQ.
5.7.2 Grounding Resistance: The electrical control box should be equipped with an obvious grounding mark, and its grounding resistance should not exceed 0.012.
5.7.3 Dielectric strength: The main circuit and the shell in the electrical control box, and the main circuit and the main circuit should be able to withstand a 1500V power frequency voltage for 1 minute. 5.8 The hot water unit should be able to meet environmental protection requirements when in stable operation. 5.8.1 The equipment noise of the hot water unit should be less than 80dB(A). 5.8.2 When the hot water unit is in stable operation, the smoke blackness should be less than 1Rb, the smoke concentration should be less than 200mg/Nm, the CO content in the flue gas should be less than 0.05%, and NO* should be less than 0.10 mg/Nm.
5.9 Operation of hot water unit
5.9.1 When the water, electricity, and fuel systems of the hot water unit are installed and debugged, the main power supply is turned on, and the upper and lower limits of the temperature are set, the switch is in the automatic position, the unit can run automatically, and the switch is in the manual position, the unit can start and run under manual operation. 5.9.2 When the hot water unit is in automatic start-up or manual start-up, if there is no ignition after 17s, the controller shall be able to automatically cut off the oil supply system and sound an alarm. 5.9.3 When the hot water unit is in stable operation, the water temperature of the system can be automatically controlled at the set temperature.
0 The water quality standard used in the hot water unit shall comply with the specifications of GB1576 and GB5749. 5.10
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
6 Test Method
6.1 The inspection of the electrical assembly quality and appearance quality of the hot water unit shall be carried out according to the product drawings. 6.2 Pressure Test of Hot Water Unit
6.2.1 After the hot water unit is filled with water, the inlet and outlet are closed, and the water pressure test machine is used to pressurize to 0.2MPa, and maintained for 5min. Wipe the weld with a dry cloth, and no water shall seep out. 6.2.2 The shell and coil of the water-water heat exchanger are tested for pressure respectively. After filling with water, the water inlet and outlet are closed, and the pressure is increased to the test pressure by a hydraulic tester. The pressure is maintained for 5 minutes. The weld is wiped with a dry cloth. No water shall seep out.
6.3 Electrical performance test of hot water unit
6.3.1 Insulation resistance test
The insulation resistance shall be tested with a megohmmeter with a rated voltage of 500V, and the test result shall meet the requirements of 5.7.1.
6.3.2 The grounding resistance shall be checked and shall meet the requirements of 5.7.2. 6.3.3 The power frequency withstand voltage test shall meet the requirements of 5.7.3. 6.4 Start-up test of hot water unit
6.4.1 Normal start-up
When the power is turned on, the oil pump and ignition system shall make the burner start to work normally within 17s.
: No ignition at startup
The burner cannot be put into normal operation within 17s. Can the controller immediately cut off the oil supply system and sound an alarm?
6.5 Noise measurementbZxz.net
Measure with a precision sound level meter. The measuring points are distributed around the unit. The number of measuring points depends on the sound field and the unit's external dimensions. The specific method refers to the provisions of GB/T3768.
Exhaust gas exhaust test
6.6.1 Use a smoke meter to extract air from the exhaust window and measure three times. The arithmetic mean of the three measurements is taken as the measurement result. It should be carried out in accordance with the provisions of GB9486. 6.6.2 The inspection of smoke concentration and exhaust gas emission should comply with the provisions of 5.8.2. 6.7 Inspection of outlet water temperature and automatic control 6.7.1 Adjust the temperature measuring instrument at the outlet of the hot water unit to the set water temperature. The burner can automatically control ignition and combustion. The temperature difference is 1℃. When the water temperature at the outlet of the hot water storage tank or the water-water heat exchanger reaches the upper limit, check whether the electrical control can automatically cut off the power supply system of the burner and stop fuel injection and combustion. 6.7.2 When the fuel pressure is lower than the lower limit, can the burner send out an audible and visual alarm and stop combustion.
6.7.3 When the water level of the hot water unit is lower than the set minimum water level, the burner will sound an audible and visual alarm and stop burning.
6.7.4 When the burner cannot guarantee the set water temperature, can the electronic control system immediately cut off the power supply to stop the oil injection combustion and sound an alarm? 6.8 Thermal efficiency and heated water flow test
6.8.1 Thermal efficiency test
6.8.1.1 Install a thermometer at the water outlet of the hot water unit and a cumulative flow meter at the water inlet.
6.8.1.2 After filling the hot water unit and the hot water storage tank with water, close the water inlet valve, start the circulating water pump, and ignite the burner for heating. When the water temperature at the water outlet (T2) rises to 60°C, turn off the burner.
6.8.1.3 Open the water inlet valve to inject water into the hot water unit, and weigh the fuel mass W, record the cumulative flow meter reading L of the water injected into the hot water unit, and measure the cold water temperature T. 6.8.1.4 When the temperature in the hot water unit drops, restart the burner, and control the opening and closing of the burner to keep the water temperature at the water outlet at 60°C ± 2°C. 6.8.1.5 Observe the final temperature T of the water outlet and the initial temperature T1 of the water inlet. When the temperature rises to 60°C, turn off the burner. Close the burner, stop the water supply, stop the timing, weigh the fuel mass Wz, and record the cumulative flow meter reading Lz.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
The test time shall not be less than 20 minutes. If the burner needs to be started and closed to maintain the test temperature, the start and close cycle shall not be less than two times. 6.8.1.6
6The thermal efficiency n(%) is calculated as shown in formula (2):
Where: Q.—heated water volume (L-L), kg; calorific value of No. 0 diesel, 42700 kJ/kg;
c—specific heat of water, 4.1868 kJ/kg℃; Q,——average fuel consumption Quantity (W,-W2), kg;
T—temperature rise of heated water (T2—T), ℃. 6.8.2 Test of heated water flow rate
00000000
6.8.2.1 The instrument and test method used are basically the same as those for thermal efficiency test. 6.8.2.2 The test time shall not be less than 10min. 6.9 Welding inspection of hot water unit
6.9.1 External inspection of hot water unit welding shall be carried out in accordance with the relevant provisions in 5.5. 6.9.2 The welding inspection of water-water heat exchange pressure vessel components shall be carried out in accordance with the provisions of Chapter 9 of JB4730—1994.
7 Inspection rules
7.1 Each hot water unit The water unit shall be inspected and qualified by the quality inspection department of the manufacturer according to this standard, and the quality certificate shall be attached before it can leave the factory.
7.2 Inspection is divided into factory inspection and type inspection
7.2.1 The factory inspection items shall be carried out in accordance with 6.2, 6.3, 6.4, 6.7, and 6.8. Those that do not meet the inspection items are allowed to be adjusted and repaired twice. If they still do not meet the standard requirements, they are not allowed to leave the factory. 7.2.2 Type inspection must be carried out in the following cases: a) New product trial production and identification;
b) If there are major improvements in structure, materials, and processes after formal production, which may affect product performance;
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