Pressure-reduction preheating
Adds heat before regulation to help maintain the required downstream gas temperature.
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China's Leading
Heating Manufacturer
Explosion-Proof Natural Gas Line Heater
Natural gas temperature control
The XGTHERMAL Explosion-Proof Natural Gas Line Heater is an indirect natural gas electric heater for pipeline transmission and pressure-regulating stations. Electric elements heat a thermal-oil medium, which transfers energy to the gas through a separate process boundary. The system supports controlled gas preheating before pressure reduction and stable downstream delivery temperatures.
XGTHERMAL configures the heater, instruments, insulation and control cabinet around gas composition, flow range, operating pressure and the required temperature after regulation. Also described as a natural gas pipeline heater or electric gas preheater, this design keeps natural gas separate from the electric heating elements.
Gas Preheating
Temperature compensation for pressure regulation and pipeline delivery
Indirect Heat Transfer
Thermal oil separates natural gas from the electric heating elements
Station Control Integration
PLC control, protection interlocks and remote station communication
Typical applications
Built for gas pipelines and pressure-regulating stations.
This product is used where natural gas needs temperature compensation before pressure reduction or during cold-weather transmission. Heating duty is selected against the station pressure profile, gas properties and minimum downstream temperature.
Pipeline offtake stations
Supports temperature control at branch lines and gas delivery points.
Gas distribution and metering
Maintains suitable process temperatures around station regulators and metering equipment.
Cold-region gas transmission
Provides controlled heating for exposed pipeline stations during winter operation.
Station heating upgrades
Can be configured for new stations or existing sites with defined process and electrical interfaces.
Heating challenges
Why temperature after pressure reduction matters.
Natural gas can cool as it passes through a pressure-reducing valve. Under suitable pressure, temperature and moisture conditions, this can create hydrate or icing risks. Preheating must therefore consider conditions after regulation, rather than only the heater outlet temperature.
Pressure reduction can lower gas temperature below the station’s permitted operating range.
Heating duty is selected from gas properties, flow and the temperature needed after regulation.
Heating helps manage temperature-related risks alongside gas dehydration and station operating controls.
- Gas composition and moisture determine the hydrate risk; heater sizing must account for the pressure-reduction duty.
- Thermal-oil temperature limits, expansion allowance and minimum operating level are considered in the package design.
- Start-up, minimum gas flow and shutdown conditions are reviewed alongside normal full-load operation.
Engineering design
Indirect natural gas electric heater design.
Electric heating elements supply heat to an intermediate thermal-oil medium. Heat then passes across the gas-side pressure boundary into the flowing natural gas. This indirect arrangement separates the gas from the elements, while gas temperature, thermal-oil temperature and operating level are monitored independently.
- Gas-side materials and flanges selected for gas composition, pressure and temperature
- Thermal-oil selection and element surface heat load matched to the operating temperature
- Insulation, drain and vent connections, instruments and piping integration available by project
- Outdoor heater and indoor or hazardous-area control cabinet layouts configured to suit the station
Control and protection
Stable outlet temperature with layered electrical and process protection.
Gas outlet temperature provides the normal control signal, while separate protection monitors abnormal process and electrical conditions. Low gas flow, thermal-oil level, high temperature and station emergency-stop signals can be included in the heating permissive and shutdown logic.
PLC / PID temperature control
Gas outlet-temperature feedback regulates heat input against the station temperature setpoint.
SCR stepless power regulation
Power output can be adjusted smoothly to reduce thermal shock and unnecessary cycling.
Gas-flow and oil-level interlocks
Low gas flow or insufficient thermal-oil level can inhibit heating and initiate an alarm or shutdown.
Independent shutdown and ESD
Independent high-temperature protection and the station emergency-stop signal can interrupt heater power. Pressure and electrical fault interlocks are configured by project.
Engineering data
Specifications
Specifications are configured to your operating conditions. Maximum ratings may not apply simultaneously.
| Specification Parameters | Specification Details |
|---|---|
| Rated Voltage | AC 380 V, 50 Hz (customizable) |
| Rated Power | Up to 3000 kW |
| Inlet/Outlet Specification | Custom flange / nozzle sizes |
| Control Mode | PLC / microcontroller / digital controller (optional) |
| Alarm Mode | Over-temperature, over-pressure, low gas flow, low oil level and electrical faults |
| Design Pressure | 0–45 MPa (gas side) |
| Control Cabinet | Explosion-proof / non-explosion-proof |
| Protection Class | IP65 |
| Explosion-Proof Grade | Exdb IIB T1~T6Gb Exdb IIC T1~T6Gb |
| Standards and Certification Area | Reference / Route | How XGTHERMAL Supports It |
|---|---|---|
| Explosion-proof design basis | IEC 60079 / GB/T 3836 | Design reference for explosion-proof heater body, terminal box and hazardous-area electrical details. |
| EU / international Ex certification | ATEX / IECEx | Project-specific certification route can be supported when required by the destination market and final hazardous-area classification. |
| Eurasian market access | EAC / TR CU 012/2011 | Certification and technical documentation support can be coordinated for Russia, Kazakhstan and other EAEU destinations. |
| Oil & gas procurement documents | IOGP JIP33 S-723 Electrical Process Heaters | JIP33-aligned data sheets, inspection and test plans, vendor document register and technical query response can be prepared for EPC review. |
| Pressure boundary | ASME BPVC Section VIII / PED 2014/68/EU | Pressure design, material traceability, welding records and third-party review can be supported when the heater body is within project pressure-equipment scope. |
| Electrical cabinet and machine safety | IEC 61439 / IEC 60204-1 | Control cabinet layout, component selection, wiring practice and electrical protection can be configured around project requirements. |
| Functional safety | IEC 61511 / SIL | SIL-rated safety loop design can be coordinated when independent shutdown or safety instrumented functions are specified. |
| Sour service materials | ISO 15156 / NACE MR0175 | Gas-wetted materials can be reviewed for H2S-containing service within the applicable standard and project scope. |
| Inspection and handover package | EN 10204 3.1, NDT reports and FAT records | Material certificates, pressure test records, non-destructive testing reports, electrical test records and factory acceptance test files can be supplied. |
| Ingress protection | IEC 60529 | IP65 / IP66 enclosure protection can be selected for outdoor oilfield stations and harsh operating environments. |
Certification availability depends on final equipment configuration, destination market requirements, hazardous-area classification and third-party conformity assessment. Standards listed here describe available engineering and documentation support, not a blanket certificate for every configuration.
| Name | Origin/Brand | Remarks |
|---|---|---|
| Heater Body | Shenyang Xinguang Electric Manufacturing Co., Ltd. | Pressure boundary and process connection customized by project |
| Heating Element | Shenyang Xinguang Electric Manufacturing Co., Ltd. | Surface heat load selected for the thermal oil and heating duty |
| Control Cabinet | Shenyang Xinguang Electric Manufacturing Co., Ltd. | Explosion-proof or safe-area cabinet available |
| Electrical Components | Delixi, Chint or project-approved equivalents | PLC, circuit breaker, contactor, thyristor, relay and isolating barrier options |
| Instruments | Chuanyi, Anhui Tiankang, Beijing Tiantai or project-approved equivalents | Gas temperature and flow, thermal-oil temperature and level, and pressure monitoring |
Operator references
One of China’s Top-Tier Electric Heating Suppliers for Oil & Gas Projects
XGTHERMAL has supplied electric heating systems for projects connected with CNPC / PetroChina, PipeChina and Sinopec. In China’s petroleum and petrochemical sectors, qualified heater suppliers must pass technical review, explosion-proof compliance checks, safety documentation review and field performance verification.
This project record places XGTHERMAL among the specialist electric heating manufacturers trusted for demanding oil and gas applications. Redacted cooperation records, contract references or project supporting materials can be provided for qualified procurement discussions.
Custom engineering
Custom engineering around your operating conditions.
Share the gas conditions, station layout and control requirements. XGTHERMAL can configure the heater package around your heating duty, installation limits and operating philosophy.
- Process medium Gas composition, moisture, contaminants and operating flow range.
- Mechanical interface Pressure rating, flange standard, skid envelope, insulation and maintenance access.
- Site safety Hazardous-area classification, IP protection, grounding and interlock requirements.
- Controls PLC/SCR control, Modbus RTU, SCADA/DCS signals and local HMI needs.
Field application
Natural gas heating on the Nenjiang Branch.
XGTHERMAL supplied horizontal indirect thermal-oil electric heating packages for three stations on the China–Russia East Route Nenjiang Branch. The project combines cold-region natural gas heating, layered protection and remote station control—the same heating approach described on this page.
