Pipeline Heater
Analysis completed, with reference to 10 sources
Pipeline heater (also known as pipeline electric heater, inline heater, sheathed tubular electric heater) is an electric heating device directly installed on a pipeline to heat the flowing medium (gas or liquid) inside the pipe. It is one of the most widely used core equipment in industrial electric heating equipment selection.
Core Working Principle
Based on the Joule heating effect: when current passes through a high-resistivity alloy resistance heating wire (such as nickel-chromium alloy or iron-chromium-aluminum alloy), electrical energy is converted into thermal energy. The heat is conducted through an insulating and thermally conductive filler (such as crystalline magnesium oxide powder) tightly packed inside the metal sheath tube to the sheath tube wall, and then the sheath tube transfers the heat to the gas or liquid medium flowing through the pipeline.
A flow guide baffle is arranged inside the cylinder to guide the medium flow path, making the heating more uniform. The temperature control unit consists of a microcontroller/PLC and temperature sensors to achieve precise temperature control and over-temperature protection.
Main Classifications
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Classification Dimension Type Features and Application Scenarios
By Medium Gas Pipeline Heater Heats air, nitrogen, argon, etc., fast temperature rise, suitable for drying and process gas preheating
Liquid Pipeline Heater Heats water, oil, chemical media, requires consideration of specific heat capacity and fluidity
By Heat Source Electric Heating Type Fast response (reaches set temperature in 5-10 minutes), thermal efficiency ≥95%, suitable for precise temperature control scenarios
Steam/Thermal Oil Heating Type Large heat capacity, suitable for high-flow high-temperature conditions, requires supporting boiler system
By Structure Flange Type Connected to pipeline via flange, easy installation, mainstream solution
Insertion/Immersion Type Heating core directly inserted into medium, suitable for storage tanks or large-diameter pipelines
External Type (Bearing Shell Type) Clamped onto the outside of the pipeline, no need to cut the pipeline, suitable for retrofit scenarios
Core Selection Factors
1. Power Calculation (Most Critical)
Liquid Medium:
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1Required Power (kW) = Medium Mass Flow Rate (kg/h) × Specific Heat Capacity (kJ/(kg·℃)) × Temperature Difference (℃) ÷ 3600 ÷ Thermal Efficiency
Specific heat capacity of water is taken as 4.2 kJ/(kg·℃), thermal oil as 2.1 kJ/(kg·℃)
Electric heating thermal efficiency is generally taken as 0.9-0.95
Gas Medium:
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1Required Power (kW) = Air Volume Flow Rate (m³/h) × Density (kg/m³) × Specific Heat at Constant Pressure × Temperature Difference (℃) ÷ 3600 ÷ Thermal Efficiency
Under standard conditions, air density is taken as 1.2 kg/m³, specific heat at constant pressure as 1.005 kJ/(kg·℃)
Industrial-grade equipment heating efficiency is generally taken as 0.8-0.9
Power Margin Correction:
Conventional intermittent operation → reserve 10% margin
24-hour continuous operation → reserve 20% margin
Outdoor exposure/high heat dissipation scenarios → add 20%-30% heat loss compensation
Severe cold regions in the north → power needs to be increased by 30%-50%
2. Material Selection (Determines Lifespan)
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Material Application Scenarios Precautions
304 Stainless Steel Drinking water, food-grade media, conventional industrial water May pit when chloride ions >200ppm
316L Stainless Steel Seawater desalination, chemical corrosion environments, pharmaceutical and food Price is 40%-60% higher than 304
Carbon Steel Ordinary industrial water, compressed air Requires regular anti-corrosion treatment, lifespan 3-5 years
Incoloy Alloy/Hastelloy High temperature (>300℃), strong acid and alkali extreme conditions Extremely high cost, not selected unless necessary
Titanium Alloy Strongly corrosive chemical media, chlor-alkali conditions Excellent corrosion resistance
3. Power Density Control
Liquid heating: tube surface load recommended ≤5-8 W/cm² (oil ≤0.7 W/cm² to prevent carbon deposition)
Gas heating: can be slightly higher, generally ≤3 W/cm²
Excessively high density easily leads to local overheating and scaling, shortening lifespan
4. Safety Protection (Essential)
Flow cutoff protection: automatically cuts power when medium stops flowing, preventing dry burning
Over-temperature protection: thermocouple + temperature controller dual monitoring
Pressure safety valve: prevents overpressure
Leakage protection: insulation resistance ≥50MΩ
Explosion-proof certification: flammable and explosive environments must select Ex d/Ex e certified products (rating up to Ex d IIC T1-T6 Gb)
Key Technical Parameter Reference
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Parameter Item Conventional Range High-end/Custom
Power 2kW～6000kW Can be customized larger
Gas Heating Temperature 0～850℃ Maximum 1050℃
Liquid Heating Temperature 0～350℃ Maximum 850℃
Working Pressure 1.0～8MPa High pressure custom 10-20MPa
Gas Processing Capacity Maximum 55000m³/h —
Liquid Flow Rate Maximum 120m³/h —
Temperature Control Accuracy ±1℃ ±0.1℃ (PID intelligent)
Thermal Efficiency ≥95% ≥98%
Explosion-proof Grade Ex d IIB T4 Ex d IIC T1-T6 Gb
Protection Grade IP54 IP65 (outdoor/explosion-proof)
Mainstream Manufacturer Resources
Jiangsu (especially the Yangzhou, Zhenjiang, and Yancheng areas) is the core industrial belt for electric heating equipment in China. Pipeline heater manufacturers are highly concentrated in this area. When procuring, prioritize connecting with local industrial belts, which have significant advantages in after-sales response and logistics costs.
Yangzhou Local Manufacturers
Yangzhou Chengrui Electric Power Equipment Co., Ltd. (Hongyang Road, Economic Development Zone): Mainly engaged in R&D, production, sales, and on-site installation and maintenance of electric heat tracing equipment, while also providing partial discharge/infrared/ultraviolet/ultrasonic detection services for power equipment, with complete capabilities from equipment to detection services.
Yangzhou Tuoteng Electric Co., Ltd.: High-tech enterprise, product line covers partial discharge detection systems, transformer comprehensive test benches, etc., serving power/communications/railway/petrochemical industries.
Zhenjiang Industrial Belt (Core Production Area for Explosion-proof Electric Heaters)
Zhenjiang Lifan Explosion-proof Electric Appliance Co., Ltd.: Nearly 20 years of industrial heating experience, 53 national patents (18 invention patents), explosion-proof rating up to Ex d IIC T1-T6 Gb, temperature control accuracy ±1℃, IP65 protection, long-term cooperation with Sinopec/PetroChina/CNOOC, products exported to Southeast Asia/Middle East/Africa, providing full-parameter non-standard customization + complete delivery solutions, core heating elements with 36-month warranty.
Zhenjiang Hengshengda Chemical Technology Co., Ltd.: Mainly promotes flameproof (Ex d IIB T4) pipeline heaters, rated power 1.5-45kW, modular structure for easy on-site replacement of heating cores, provides ASME B31.4 pipeline interface adaptation services.
Zhenjiang Wanquan Electric Technology Co., Ltd.: Designed according to GB 3836.1-2021, provides two structures: Ex d IIB T4 and Ex e II T4, standard PT100 dual-point temperature measurement and automatic over-temperature power cutoff, temperature control cabinet supports Modbus RTU communication protocol for easy integration into DCS systems.
Zhenjiang Huiwu'er Electric Co., Ltd.: Mainly focuses on reactor electric heaters and air duct explosion-proof electric heaters, segmented heating design with single unit up to 60kW, provides Hastelloy C276 heating tube option for corrosive media.
Yancheng Industrial Belt
Yancheng Chuangshiyuan Electric Heating Equipment Co., Ltd.: Products cover pipeline heaters for various media such as nitrogen/air/water, can heat media to 650℃, shell temperature only about 50℃, supports customized services.
Jiangsu Yong'an Electric Heating Equipment Co., Ltd.: Deeply engaged in chemical/petroleum/coating/HVAC industries, provides complete solutions for electric heating equipment, with rich frontline practical experience.
Yancheng Xinyuanxin Environmental Protection Equipment Co., Ltd.: Started with heat exchangers, explosion-proof pipeline heaters have passed NEPSI explosion-proof certification, mainly focuses on air/gas medium heating, air volume adaptation 1000-20000m³/h, can provide integrated design of heating section and heat exchange section.
Other Manufacturers in Jiangsu
Jiangsu Pengxingbo Industrial Co., Ltd.: Product line covers explosion-proof pipeline electric heaters, air duct electric heaters, and thermal oil furnace systems, explosion-proof structure has passed CNEX Ex d IIB T4 certification, heating tubes use double-layer stainless steel armoring, supports PID temperature control ±2℃ accuracy, provides complete explosion-proof control cabinet integration solutions.
Nationally Renowned Brands
Anhui Anbang Electric Heat Tracing Cable Co., Ltd.: 20 years of experience in R&D and production of electric heating products, product series cover electric heat tracing systems, electric heaters, electric floor heating systems, etc. Explosion-proof tank-type electric heaters have low tube surface power load, suitable for heating viscous and heat-sensitive liquid media.
Executive Standards
JB/T 2379-2016: Metal Tubular Heating Elements (Core Standard)
GB 3836 Series: Electrical Equipment for Explosive Atmospheres (Basis for Explosion-proof Certification)
GB 150: Pressure Vessels (Reference for High-pressure Customization)
ASME B31.4: Pipeline Interface Adaptation (Reference for Export Projects)
Installation and Usage Precautions
Installation Position: Try to choose at the pipeline inlet (the frontmost end of outdoor pipelines), so that hot air carries heat through the entire journey from the start, avoiding installation at the end which would cause the front pipeline to still freeze
Flow Rate Requirement: Medium flow rate should be ≥0.3 m/s (thermal oil), heating tube surface temperature should be 30℃ lower than the medium boiling point to prevent local boiling
Insulation Support: Adding insulation layer can reduce heat loss by more than 20%, especially essential for high-temperature conditions
Medium First, Then Power: Dry burning is strictly prohibited; must confirm normal medium flow before starting heating
Segmented Heating for Long Pipelines: For outdoor pipelines of several hundred meters, do not blindly choose a single super-high-power device; small-power supplementary heating can be added midway, which is more energy-saving and provides more uniform temperature distribution than a single high-power unit
Regular Maintenance: Check heating tube insulation resistance (≥50MΩ), clean scaling, explosion-proof equipment requires regular inspection of sealing performance
