Quality appraisal of steam equipment

steaming equipment is a key equipment for material processing through high-temperature steam. It is widely used in food processing, textile dyeing and finishing, pharmaceutical and chemical industry and other fields. In the food industry, steaming equipment is used for raw material sterilization, softening (such as conditioning before rice shelling), and starch gelatinization; in the textile industry, steaming equipment is used to achieve fiber shaping and desizing (such as the steam desizing process of cotton fabrics); in the medical field, steaming equipment is used to complete the drying and sterilization of medicines (such as moist heat sterilization cabinets).

Compared with traditional water boiling or hot air treatment, modern steaming equipment occupies an important position in industrial production due to its characteristics of uniform steam penetration, low energy consumption and less pollution. Its technical level directly affects product quality, production efficiency and energy consumption, and is an important support for the green upgrading of the manufacturing industry.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide steaming equipment quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for steaming equipment quality appraisal.

As the application scenarios of steaming equipment expand, quality dispute cases are gradually increasing. The judicial dispute focuses on:

1 and whether the equipment meets the temperature uniformity agreed in the contract (such as ±2℃), pressure stability (±0.05MPa) and other indicators;

2, whether there is material deterioration or safety accidents due to steam leakage and temperature control failure;

3, whether the material’s corrosion resistance meets the requirements of working conditions (such as food-grade stainless steel 316L);

4. Whether the control system has fault warning and safety interlocking functions.

Steaming equipment quality appraisal technical methods include:

1, appearance and structural inspection

Verify whether the main material of the equipment (such as stainless steel, aluminum alloy) meets the corrosion resistance requirements, and whether there are pores and slag inclusions in the welds.

Check the integrity of the seals (silicone gasket, bellows) and test the steam leakage rate (≤0.1%).

2 and performance parameter test

05, control system function verification

1

2 simulates abnormal working conditions such as overtemperature and overpressure, and tests the response time of automatic shutdown and alarm functions (≤2 seconds). Check the human-machine interface parameter setting logic and verify the PID algorithm adjustment accuracy.

3

46, energy efficiency and environmental protection testing

5

6 measures steam consumption (kg/h), condensate recovery rate, and evaluates energy utilization efficiency. Detect the concentration of volatile organic compounds (VOCs) in the exhaust gas to confirm whether it meets environmental protection standards.

7

87, on-site process and operation evaluation

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A food company of the applicant signed a "Fully Automatic Steam Sterilization Equipment Purchase Contract" with a machinery manufacturing company of the respondent, agreeing to purchase 4 units of model QS-100 equipment for can sterilization. After the equipment was put into production, many batches of cans had problems with can expansion and excessive microorganisms, leading to product recalls. The food company believed that the equipment had a design defect and demanded compensation for losses. The machinery company argued that the problem was caused by improper material pre-processing or operation, and both parties went to court. The court entrusted a third-party appraisal agency to conduct quality appraisal of the equipment involved in the case.

Identification and analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "steaming equipment", contract technical agreements, on-site investigation case materials and other data, and made the following quality analysis opinions:

1. The welds of the inner tank of the steaming equipment involved in the case have incomplete welding defects, and local corrosion and perforations lead to steam leakage. The sealing gasket is made of ordinary silicone (the contract requires fluorosilicone) and has insufficient temperature resistance.

2, the calibration error of the temperature sensor of the steaming equipment involved reached ±3℃, and the over-temperature alarm threshold was set too high (135℃, standard 125℃). The human-machine interface allows manual skipping of the sterilization time countdown without permission restrictions.

The steaming equipment quality appraisal report should include the following content:

1. Information about the appraisal client and the appraised party.

2. Testing items, sampling methods, testing methods and equipment.

3. Test results and analysis.

4. Quality evaluation conclusion.