Some standard content:
Light Industry Standard of the People's Republic of China
Batch Coil Evaporator
Subject Content and Scope of Application
QB/T1824-1993
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of batch coil evaporators.
This standard applies to single-effect batch coil evaporators used in the dairy, pharmaceutical and other industries. 2 Reference standards
Steel pressure vessels
GB/T191 Pictorial symbols for packaging, storage and transportation
GB/T14253 General technical conditions for light industrial machinery JB302 Classification of casting defect names
JB/T2759 General technical conditions for packaging of electromechanical products QB/T1588.4 General technical conditions for painting of light industrial machinery QB/T1823 Method for compiling dairy machinery models Determination of sound pressure level of noise of metal cutting machine tools ZB J50 004
3 Product classification
3.1 According to the provisions of QB/T1823, the model is marked as: R
3.2 Main technical parameters are shown in the table below.
Water evaporation amount/(kg/h)
Using steam pressure/MPa
Vacuum degree/kPa
Steam consumption/(kg/kg evaporated water）
Main parameters (evaporation amount)
Type code
Characteristic code (PG: coil)
Classification code (N: concentration)
Major category code (R: dairy machinery)
RNPG01-300
Cooling water consumption/(kg/kg evaporated water)Inlet water 15C, outlet water 40℃ 4 Technical requirements
RNPG01-700
≥700
≤1,14
4.1 The products shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved in the prescribed procedures. Approved by the Ministry of Light Industry of the People's Republic of China on July 29, 1993RNPG01-1 000
≥1000
Implemented on March 1, 1994
QB/T 1824—1993
4.2 All purchased parts and raw materials shall have the inspection certificate or quality assurance book of the supplier. If there is no certificate and quality assurance book, the manufacturer shall inspect the purchased parts and raw materials, and only qualified ones shall be adopted. 4.3 The basic technical requirements of the whole product shall comply with the requirements of GB/T14253. 4.4 The overall insulation resistance shall not be less than 2MQ.
4.5 When the equipment is running empty to a vacuum degree of 88kPa, it shall stop normal operation, and the vacuum degree shall not drop by more than 6.7kPa within 30 minutes. 4.6 When the equipment is running normally, the noise sound pressure level shall not exceed 85dB(A). 4.7 Castings should not have various defects that affect the strength and other properties of castings as specified in JB/T302. The molding sand, burrs, pouring risers, etc. on the surface and inner cavity of the castings should be cleaned.
4.8 The parts in contact with the material should be made of materials that meet the requirements of food hygiene. The product should be easy to clean and disinfect. The pipes should be bent as little as possible, and there should be no blind ends or right angles. 4.9 The surface roughness R. value of the surface in contact with the material should not be greater than 1.6μm. It is not allowed to have obvious defects such as unevenness, spots, burns and scratches. The polished surface should have neat and beautiful lines. 4.10 The metal coating on the surface of the parts should not fall off, darken, be rough and uneven, and the surface should be bright. 4.11 The paint should comply with the provisions of QB/T1588.4. 4.12 Requirements for the manufacture of main parts and components
4.12.1 The manufacture of the pot body, separator, coil and steam drum should comply with the relevant provisions of GB150. 4.12.2 After the boiler, separator, coil and steam drum are manufactured, pressure test and tightness test shall be carried out. a.bZxz.net
The boiler and separator shall be subjected to 0.15MPa pressure test; b.
The coil shall be subjected to 0.25MPa pressure test; c.
The steam drum shall be subjected to 0.4MPa pressure test. 4.13 After the inlet valve, outlet valve and sampling valve are assembled, a 0.15MPa water pressure test shall be carried out, and the pressure shall be maintained for 5 minutes without leakage. 5 Test method
5.1 Water evaporation
Use a Baume meter or a hydrometer to measure the concentration (solid content) of the milk before and after concentration, and then calculate it according to formula (1): B1
W, = S(1 -
W) ...
B2-——Concentration of concentrated milk, %.
5.2 Steam consumption
Install a steam flow meter on the product main steam inlet pipeline to measure the steam inlet per unit time. If the conditions for installing a steam flow meter are not met, the condensed water weighing method is allowed to measure the steam consumption per unit time and compare it with the evaporation amount in the corresponding time. That is: Db
Where: D-steam consumption, kg/kg evaporated water; Dh
Steam consumption per unit time, kg/h;
W,——-water evaporation, kg/h.
5.3 Cooling water consumption
（2）
Use a flow meter on the cooling water replenishment pipe to measure the cooling water consumption per unit time, and then compare it with the water evaporation in the corresponding time. The measurement should be carried out under the conditions of inlet water temperature of 15℃ and outlet water temperature of 40℃. If it is not under these conditions, the inlet water volume should be adjusted to stabilize the outlet water temperature at a value close to 40℃, and then the measured cooling water consumption should be converted into the cooling water consumption under these conditions according to formula (3). 348
Where: W is cooling water consumption, kg/kg evaporated water; W Measured water consumption, kg/h;
TOutlet water temperature during measurement, ℃;
Th——Inlet water temperature during measurement, ℃,
WWater evaporation, kg/h.
5.4 Noise
Measured in accordance with the provisions of ZBJ50004.
QB/T 1824—1993
Wi(Tk- Th)
(40℃-15℃)W
5.5 The tests of 5.1 to 5.4 should be carried out when the product is operating normally. 5.6 Insulation resistance
Measured between the motor output terminal and the housing with a 500V megohmmeter. 5.7 Inspection of 4.5
Close all connections, start the hydraulic ejector to evacuate to above 88kPa, then shut down the hydraulic ejector and observe the vacuum gauge. 5.8 Inspection of 4.7 to 4.10
4.7 of this standard ~4.10 Visual inspection. 5.9 Paint
The paint surface shall be inspected in accordance with the provisions of QB/T1588.4. 5.10 Inspection of 4.12.1
The manufacture of boiler, separator, coil and steam drum shall be inspected in accordance with the relevant provisions of GB150. 5.11 Test of 4.12.2
(3)
5.11.1 The pressure test of boiler, separator, coil and steam drum shall be carried out in accordance with the provisions of 10.9.4 of GB150, and the test liquid shall be water. 5.11.2 The tightness test of boiler, separator, coil and steam drum shall be carried out in accordance with the provisions of 10.9.6.2 of GB150, i.e., kerosene leakage test.
Kerosene leakage test: Clean the inspectable side of the weld, apply white powder slurry, dry it, and then apply kerosene on the other side of the weld to make the surface sufficiently wetted. After 30 minutes, if there is no oil on the white powder, it is qualified. 6 Inspection rules
6.1 Factory inspection
6.1.1 Factory inspection must be carried out before the product leaves the factory. 6.1.2 Each batch of products shall be inspected one by one according to the product drawings, technical documents approved by the prescribed procedures and the requirements of 4.4, 4.7 to 4.13, including the manufacturing, assembly, appearance, safety and health, and nameplate of the product. 6.1.3 Products can only leave the factory after passing the factory inspection, and they shall be accompanied by documents proving the quality of the products. 6.2 Type inspection
6.2.1 Type inspection shall be carried out in the following circumstances. The product is tested after trial production or when it is transferred to another factory for production; a.
After formal production, if there are major changes in structure, materials, and processes that may affect product performance; b.
Once every three years during normal production;
When the product is resumed after a long period of suspension; d.
When the national quality supervision agency proposes a requirement for type inspection. e.
6.2.2 Type inspection should be conducted on one unit randomly selected from the products that have passed the factory inspection, and should comply with the provisions of Article 3.2 Main Technical Parameters and Chapter 4 Technical Requirements. If there is one serious defect, the batch of products is considered unqualified. 349
7 Marking, packaging, transportation, storage
7.1 Marking
7.1.1 Product Marking
Product marking content includes:
Manufacturer name:
Product name;
Product model;
Manufacturing date;
Main parameters of the product;
Motor model and power;
Total weight of the equipment.
Packing Marking
QB/T1824—1993
The packaging box should have clear and neat markings that are not blurred due to long-term transportation or storage, including: a.
Manufacturer name,
Product model, name and quantity;
Factory number and box number;
Box size (length×width×height) and gross weight; Name and address of the consignee;
“Handle with care”, “Lifting instructions”, “Upward”, and the year and month of packaging and other words and signs. The packaging mark shall comply with the provisions of GB/T191. 7.1.2.2
7.2 Packaging
7.2.1 The product packaging shall comply with the provisions of JB/T2759. 7.2.2
Each product shall be provided with the following documents: a.
Instruction manual;
Product certificate;
c. Packing list.
The above documents shall be packed in a moisture-proof bag.
7.3 Transportation and storage
7.3.1 The product shall not be collided during transportation. 7.3.2 The equipment shall be stored in a clean and dry warehouse and shall be avoided from coexistence with chemicals. 8 Quality assurance
Under the condition that the user complies with the storage and use rules, within 12 months from the date of delivery from the manufacturer to the user, if the product is damaged or cannot work normally due to poor manufacturing quality, the manufacturer shall replace parts and repair the product for the user free of charge. Additional Notes:
This standard was proposed by the Technical Equipment Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Dairy Machinery Standardization Center. This standard was drafted by Shanghai Qianwei Machinery Factory. The main drafters of this standard are Wang Wufang and Shi Lianguan. From the date of implementation of this standard, the professional standard ZB/TY99021-~1989 "Coil Intermittent Evaporator" issued by the former Ministry of Light Industry will be invalid. 350
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