Technical Support Case Library
34 real technical support cases in chronological order. Covering selection, corrosion, ice blockage, cooling, pressure, system design, and all scenario types.
34 Real CasesAll Scenarios2025 Annual Summary
Technical Support Case Library
34 real technical support cases in chronological order. Covering selection, corrosion, ice blockage, cooling, pressure, system design, and all scenario types.
34 Real CasesAll Scenarios2025 Annual Summary
2025.01.06LM-15A/B
Dunmao New Materials · AnhuiCustomer needs organic heat carrier type inspection reports for LM-15A and LM-15B
Explained to sales manager why no such reports exist (not within mandatory testing scope)
2025.01.08
Youdao Chemical · Shandong WeifangCustomer needs coolant at -60°C with concentrated nitric acid in system
Concentrated nitric acid is strongly oxidizing; no suitable product available
2025.01.10LM-10A, etc.
(WeChat communication) · BeijingCustomer needs water-free and alcohol-free product for -25°C operation
Recommended 10A, 11 series, 14 series and 15 series; explained 100% water-free cannot be guaranteed
2025.02.11LM-10A
LM-10A Raw Material Specs · -Raw material manufacturer drafted enterprise standard; needs adjustment for low-temperature viscosity, flash point, etc.
Communicated with manufacturer technicians to minimize viscosity while ensuring closed-cup flash point above 95°C
2025.02.14LM-8
Beijing Zhongran Senchuang · BeijingSource tower heating poor performance; system uses methanol-glycol mixture with 30°C flash point
Analyzed undersized pump; flow insufficient after viscosity increase. Recommended LM-8 (-50°C freezing point) with pump adjustment
2025.02.18LM-11D
Baisheng · ShenzhenLM-11D water contamination; ice blockage during cooling
System water tank open; previous LM-4 test not fully drained. Recommended draining coolant, stratifying, collecting upper portion, blow-drying system
2025.02.19LM-11D
DoFluoro Chemical · ZhejiangLM-11D viscosity higher than competitor TOPS; York manufacturer says it affects heat exchange
Calculated: viscosity increase causes 7.5% resistance impact, 1.5% heat exchange impact; negligible for design. Recommended third-party testing
2025.02.20LM-8
Lingkai Pharmaceutical · ShandongLM-8 condenser leaks HF/HCl into coolant system
HCl, HF are water-soluble; no strong exothermic reaction, relatively safe. But coolant anti-corrosion effectiveness will deteriorate
2025.02.24LM-11F
Chengda Pharmaceutical · JiashanLM-11F replaced LM-1; reactor cooling performance poor
Comparison shows -50°C 11F viscosity (4) lower than Type 1 (10.28), but thermal conductivity is half; main cause of poor cooling
2025.03.12LM-4
Sanchuan Chemical · Hebei XingtaiAmmonia entered brine system; need to resolve corrosion
pH can be lowered with organic acids but cannot resolve root cause. Provided 2024 ammonia contamination sample results as reference
2025.03.17LM-XL
Zhejiang Xuebolan Technology · Zhejiang JinhuaLM-XL series product coloring
Use water-soluble dyes; coordinated coloring plan with factory manager Sun
2025.03.30LM-8
Aerospace Yisenlin · -LM-8 operating at -35°C; pressure rises from 3bar to 8bar after shutdown
Thermal expansion without pressure relief device; recommended adding pressure-maintaining makeup device
2025.04.22LM-4
Xinhua Insurance Data Center · BeijingLM-4 turns black and foams
Sampled for testing
2025.04.26LM-4
Xinjiang Cold Storage · XinjiangLM-4 turns black, copper corrosion. Original system was ammonia storage conversion with refrigeration oil and ammonia residue
Recommended sampling to test if adjustable. Cold storage marginally profitable; replacement cost may be high
2025.04.27LM-15B
Chongqing Changyu Electromechanical · ChongqingLM-15B boils and overflows when heated to 106°C
High water content in system; boiling carries coolant out. Recommended separating water first before heating
2025.04.28LM-4
Shandong Huatai · ShandongLM-4 HCl contamination corrosion
Recommended adding enhancer and alkali for pH adjustment; monitor pH during operation; consider replacement
2025.05.26LM-4
Fujian Cold Storage · FujianAluminum coil corrosion leaks; LM-4 used 2-3 years with multiple perforations
Sampling test shows no aluminum corrosion; cut pipe found crystalline substance. Planned analysis at Dalian University of Technology
2025.05.27LM-4
Huaqing Ronghao · BeijingAfter adding 12.42t coolant, freezing point is -6°C; wants to adjust to -10°C
Calculated addition amount ~7t; recommended purchasing extra to prevent shortage
2025.05.28LM-8
- · ChongqingLM-8 cannot cool below -42°C; plate heat exchanger localized icing
Recommended Type 1 (customer concerned about flash point); considering LM-11D but must ensure water-free system
2025.06.10LM-8
China Aerospace · HuanghuaHeat exchanger failed twice within 1 year/4 months after replacement
Found water tank return spray entraining large amounts of oxygen causing corrosion. Short-term: seal; long-term: replace with LM-4 (-15°C operation)
2025.06.17LM-11D
Guangzhou Hengxing · GuangzhouLM-11D ice blockage; pump seizes then restarts after temperature rises
Moisture reduced to 47ppm. Recommended filter before pump; clean regularly based on operating current
2025.06.18LM-4
Wanwei Group · Anhui ChaohuGlycol system severe corrosion; PV polymer material contamination
Need sampling to test enhancer effectiveness. New system recommends LM-4; enhancer addition plan has risks
2025.06.19LM-4
Jinsheng Grain & Oil · LinyiCooling difficulties after adding enhancer; foam in tank
Possible component precipitation causing foam affecting heat exchange. Remove foam; may need defoamer; stop and circulate 24h then observe
2025.07.02LM-11D
- · Inner MongoliaLM-11D system reactor not receiving fluid
Suspected inlet pipe blockage or ice blockage. Drain coolant for physical density separation of water. Recommend nitrogen blanketing for tank
2025.09.02LM-495
Guizhou Jiangshan Crop Science · Guizhou Weng'anLM-495 requires reserve alkalinity >12mL, pH 7.5-9.5, density 1.10-1.15
Customized parameters per customer requirements
2025.09.21LM-11D
- · ChongqingLM-11D water contamination ice blockage; molecular sieve ineffective
Tried adding alcohol to lower water freezing point; Beijing lab tests showed some effect; customer to try
2025.09.29LM-11C
Dachen Pharmaceutical · TaizhouLM-11C reactor bulging and deformation
Valve closure with temperature change caused volume change and pressure. Do not close outlet valve; maintain tank connection
2025.10.06LM-11D/LM-4
- · TaizhouLM-11D replaced LM-4; temperature cannot decrease
11D specific heat and thermal conductivity both lower than LM-4; heat exchange capacity insufficient. Customer considering reverting to LM-4
2025.10.16LM-4
- · ZhejiangSystem operating temperature difference too small (1-1.5°C)
Low end-load, high pump flow. Recommended reducing pump frequency to lower flow
2025.10.16LM-4
- · ZhejiangLM-4 pressurization; system pressure near critical point
Recommended increasing nitrogen pressurization from 50kPa to 80kPa to prevent high-point flash vaporization
2025.10.24LM-8
- · ZhejiangLM-8 cannot cool below -36°C (set point -50°C)
Insufficient system flow causing heat exchanger icing. Raise to above 0°C then reset to -45°C operation
2025.11.15LM-445
Chongqing Jinguan · -LM-445 cannot cool below -16°C
Possible insufficient heat exchanger area or pump flow. Recommended setting -17°C and slowly cooling to find lower limit
2025.11.26LM-11D
Shanghai Nuoleng · -LM-11D water contamination; cannot cool below -40°C; water content 104ppm
Recommended physical separation followed by molecular sieve drying
2025.12.03LM-11D/LM-8
- · JiangsuLM-11D replacing LM-8
Pipes to DN40/DN50, flow rate double, heat exchange area 1.5x
Post time: Aug-26-2026