Diaphragm compressor quality appraisal

The

diaphragm compressor uses the reciprocating motion of a flexible diaphragm as its core principle. Through the synergy of the precision crankshaft connecting rod mechanism and the hydraulic drive system, it achieves oil-free gas compression and high-purity transportation. It is widely used in chemical, pharmaceutical, food and nuclear industries. In chemical production, it is used to safely pressurize toxic and harmful gases such as chlorine and hydrogen; in the medical field, it meets the cleanliness requirements for sterile-grade gas transportation; in food processing, it ensures zero pollution of compressed air; in nuclear industry scenarios, it needs to adapt to the sealing standards of radioactive gases. Compared with traditional piston compressors, diaphragm compressors have the characteristics of good sealing, zero media pollution, and strong corrosion resistance. They are key equipment for safe and efficient gas treatment in high-end industrial fields.

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

The wide application of

diaphragm compressors in high-pressure and high-risk environments has led to a professional trend in quality disputes. The judicial dispute focuses on:

1. Dispute over performance indicators: whether the actual exhaust pressure meets the standard (for example, the design value is 25MPa, the actual measurement is less than 20MPa), and whether the volumetric efficiency complies with the technical agreement;

2. Material defects: the metal diaphragm breaks due to insufficient fatigue strength, Hydraulic oil contamination caused corrosion and perforation of the diaphragm;

3. Process problems: The porosity of the crankcase casting exceeded the standard and key welds were not penetrated, causing gas leakage;

4. Contract performance disputes: The configuration of the delivered equipment (such as the diaphragm material being replaced by titanium alloy instead of stainless steel) was inconsistent with the technical agreement.

0 Such cases require a combination of material mechanics analysis, dynamic sealing testing and fault reproduction experiments to accurately locate the root cause of the failure.

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Diaphragm compressor quality appraisal technical methods mainly include:

1. Appearance inspection

Conduct a full surface inspection of the outside of the diaphragm compressor, including whether there are any abnormalities or defects in the paint surface, welding, installation, etc.

2. Disassembly inspection

Carry out disassembly inspection of the diaphragm compressor, focusing on the wear, deformation, corrosion, etc. of key components such as the diaphragm, cylinder head, and piston.

03. Performance test

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2 Under specified working conditions, the performance of the diaphragm compressor is tested, including flow, pressure, power consumption, efficiency and other indicators, and compared with standard values or contract agreements.

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44. Material analysis

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6 analyzes the materials of key components such as diaphragms, cylinder heads, and pistons, and detects their chemical composition, hardness, strength and other indicators to determine whether they meet the design requirements.

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A chemical company of the applicant signed a "Diaphragm Compressor Procurement Contract" with a compressor manufacturer of the respondent to purchase 5 GMW-50 equipment for chlorine gas boosting. After three months of operation, the diaphragms of two compressors ruptured, causing chlorine gas to leak, causing a production accident. The chemical company accused the diaphragm material of being substandard, and the manufacturer argued that it was caused by excessive operating pressure.

Identification and analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information, contract technical agreements, on-site investigation case materials and other data of "Diaphragm Compressor" and made the following quality analysis opinions: HTMLTAGTOKE The nickel-based alloy molybdenum content of the diaphragm involved in N5

is only 14.8% (contract requirement ≥16%), and the fatigue life is less than 60% of the standard value; there are dense pores on the inner wall of the crankcase (porosity 4.2%, standard ≤1.5%), causing stress concentration; the acid value of the hydraulic oil exceeds the standard (1.8mgKOH/g, standard ≤0.5mgKOH/g), accelerating corrosion of the diaphragm.

The appraisal conclusion found that the manufacturer failed to control the material composition and casting process in accordance with the agreement, oil contamination further aggravated the failure, and equipment defects were the main responsible factors.

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Diaphragm compressor quality appraisal report should include the following contents:

1, basic information of the client

2, purpose of appraisal

3, basic information of the appraisal object

4, identification technical method

05, identification process and results

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26, identification conclusion

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