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Explosion-Proof Induction Heater

Oilfield induction heating

The Explosion-Proof Induction Heater uses electromagnetic induction to heat a metal core tube, which transfers heat to flowing crude oil or produced fluid. Also known as an electromagnetic pipeline heater, it keeps the induction winding separate from the process fluid and uses a return-flow arrangement to distribute heat along the heating section.

XGTHERMAL manufactures induction process heaters in China for oilfield gathering and transfer stations, including water-cut crude oil service. The heater body, coil arrangement, insulation and controls are configured around the fluid properties and site conditions, with multi-unit skid packages available for larger heating duties.

XGTHERMAL explosion-proof induction heater package with return-flow piping and control cabinets

Separated Induction Winding The energized coil is kept separate from the process fluid

Return-Flow Heating Path An extended heating section with distributed coil winding

Multi-Unit Skid Options Heating units, piping, instrumentation and controls supplied together

Typical applications

Controlled heating for crude oil and produced liquids.

The main application is controlled heating of crude oil and produced liquids before transfer or separation. Water cut, viscosity, sand content and scaling tendency are reviewed together with the required temperature rise and operating flow range.

Crude oil gathering and transfer

Raises fluid temperature for transfer through oilfield gathering and station piping.

Water-cut crude oil heating

Matches heat input to changing oil-water composition and the required outlet temperature.

Pre-separation temperature conditioning

Preheats produced liquids to the temperature specified for the downstream separation process.

Cold-region station operation

Supports viscosity control in winter, with insulation and freeze protection selected for the site.

Sand- and scale-prone service

Heating passages and drain access are reviewed for solids-bearing fluids and planned cleaning.

Heating challenges

Manage heat transfer without overlooking sand and scale.

Sand and scale can restrict flow and impair heat transfer, while a poorly matched heating surface can develop hot spots. The technical design combines an extended heating section, distributed coil winding and accessible drainage to address these practical oilfield operating concerns.

Process challenge Viscous, solids-bearing fluid

Cold crude and entrained sand can complicate flow distribution and maintenance.

XGTHERMAL design focus Distributed heating and drain access

Coil layout, heating length and fluid passages are selected together for the process duty.

Operational risk Hot spots and restricted passages

Deposits or low flow can increase wall temperature even when the bulk outlet temperature appears normal.

Allowable wall temperature and surface heat load are selected from the crude properties and fouling risk.
Drain locations and maintenance access are considered alongside flow velocity and solids behavior.
A longer flow path must be balanced against pressure drop; it is not an automatic efficiency multiplier.

Induction heating assembly showing return-flow pipe connections and skid-mounted control equipment

Engineering design

Heat generated in the metal. Flow arranged around it.

An alternating magnetic field induces currents in the metal core tube, producing heat in the metal itself. Fluid follows the designed internal passage and return path around the heating section. The coil is isolated from the process fluid, but the heated metal wall remains a wetted heat-transfer surface and still requires temperature and no-flow protection.

Ferromagnetic heating tube and induction winding selected as a matched assembly
Distributed coil layout to limit concentrated heat input along the heating section
Return-flow passages, guides and drain connections configured for the process fluid
Modular heater units, instruments and control cabinets available as an integrated skid

Design comparison

Compare the flow path and the heating method.

These are separate design choices. A return-flow passage can be used with different heat sources; induction describes how heat is generated, not how many passes the fluid makes.

Design consideration	Single-pass layout	XGTHERMAL return-flow layout
Fluid route	One passage through the heating section.	The fluid travels through an internal passage and returns along a second passage.
Heat-transfer design	Heating length and area are selected for the required duty.	Uses an extended path around the heating section; coil distribution and active area are matched to the duty.
Hydraulic trade-off	Pressure drop depends on passage size, velocity and fluid properties.	Extra passage length and turns must be included in pressure-drop and minimum-flow checks.
Solids and maintenance	Cleaning access depends on the particular heater construction.	Drain access and internal flow passages are considered for sand- and scale-prone oilfield service.

A longer path alone does not establish a fixed increase in residence time or efficiency. Compare the actual geometry, flow rate, heat-transfer area and pressure drop.

Design consideration	Sheathed resistance heater	Induction process heater
Where heat is generated	In a resistive element; heat passes through its insulation and sheath.	In the metal heating tube through induced currents; heat passes through the tube wall to the fluid.
Fluid contact	The element sheath contacts the fluid; the resistive conductor is insulated inside it.	The heated tube wall contacts the fluid; the induction winding is separated from it.
Overheating and fouling	Sheath loading, deposits and minimum flow must be checked.	Wall loading, deposits and minimum flow still require review. Induction does not make the wetted wall fouling-proof.
Maintenance planning	Allow access for bundle inspection, cleaning and element replacement.	Allow access for coil inspection and servicing as well as cleaning of the fluid passages.
Energy comparison	Compare metered kWh at the same fluid composition, mass flow and temperature rise, including controls and heat losses. Neither heating method guarantees a fixed percentage saving for every installation.

Power-factor correction addresses reactive demand and may reduce electrical distribution losses or tariff penalties. It is not evidence of an equal percentage reduction in process-heating energy. General mechanism reference: U.S. Department of Energy: process heating methods; this is not a product performance certification.

Control and protection

Separate temperature regulation from protective shutdown.

PLC temperature regulation is combined with shell and core temperature monitoring. Normal control, early warning and protective shutdown have different roles: a cleared first-stage alarm is not the same as permission to restart after a latched over-temperature trip.

PLC / PID output control

Measured temperature is compared with the setpoint; a 4–20 mA command regulates the power-control stage.

Local and remote operation

Local controls and remote start / stop can be provided, with RS485 MODBUS-RTU communication to station SCADA or DCS.

Shell and core temperature monitoring

First-stage warnings and second-stage high-temperature trips provide distinct responses. Latched trips require manual reset after the cause is checked.

Process interlocks and electrical protection

Flow, pressure and electrical-fault protection are selected for the installation. Power-factor compensation and harmonic filtering may be configured for the site network; neither replaces temperature or no-flow protection.

Engineering data

Specifications

The ranges below describe configurable heater units. Larger duties can use a multi-unit package, such as the 600 kW Xinjiang project. Final ratings, Ex marking and supplied documents are confirmed for the selected configuration.

Specification Parameters	Specification Details
Rated Voltage	AC 380 V, 50 Hz (customizable)
Rated Power	Up to 500 kW per unit
Inlet/Outlet Specification	Custom flange / nozzle sizes
Control Mode	PLC / microcontroller / digital controller (optional)
Alarm Mode	Shell / core over-temperature; flow, pressure and electrical faults
Design Pressure	Up to 9.9 MPa
Control Cabinet	Explosion-proof / non-explosion-proof
Protection Class	IP65
Explosion-Proof Grade	IIB / IIC; temperature class by configuration

Standards and Certification Area	Reference / Route	How XGTHERMAL Supports It
Explosion-proof design basis	IEC 60079 / GB/T 3836	Applicable requirements for the induction heating assembly, enclosure, terminals and hazardous-area electrical equipment.
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	S-723 primarily covers resistance-type heater bundles. Relevant procurement clauses may be reviewed with the EPC for an induction package; no blanket S-723 compliance is implied.
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	Material selection can be reviewed for H₂S or sour crude service when required by the process medium.
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
Induction Heating Assembly	Shenyang Xinguang Electric Manufacturing Co., Ltd.	Heating tube, winding and insulation configured for duty and fluid properties
Control Cabinet	Shenyang Xinguang Electric Manufacturing Co., Ltd.	Explosion-proof or safe-area cabinet available
Electrical Components	Delixi, Chint or project-approved equivalents	PLC, power regulator, breakers, contactors, relays and filtering options
Instruments	Chuanyi, Anhui Tiankang, Beijing Tiantai or project-approved equivalents	Temperature, pressure, flow and level instruments configured by process design

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.

View Project Cases Request Project References

Custom engineering

Custom engineering around your operating conditions.

Share the operating conditions, installation limits and control requirements. XGTHERMAL can configure the heater body or integrated skid and define the mechanical, electrical and station-control interfaces with your team.

Process medium Crude oil, water cut, viscosity, sand content and scaling tendency.
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 / PID regulation, MODBUS-RTU, local HMI and station interlocks.

Discuss Custom Requirements

Sizing & RFQ Guidance

Help us select your induction heater.

Start with the required heat duty, Q = ṁ × Cp × ΔT. Induction heater selection also checks allowable wall temperature, fluid velocity, pressure drop and coil loading. For water-cut or solids-bearing crude, representative fluid data are needed rather than a single generic oil property.

Fluid composition and water cut
Normal operating flow rate
Minimum / maximum flow and turndown
Inlet and target outlet temperature
Design pressure and flange standard
Allowable pressure drop
Viscosity, wax tendency, sand and scale characteristics
Allowable heated-wall temperature and surface heat load
Hazardous-area classification
Start-up and turndown conditions
Power supply and site electrical limits
Heater body or skid-mounted package
Local panel, PLC, Modbus RTU, SCADA or DCS interface

Technical FAQ

Common engineering questions.

Is an electromagnetic heater the same as an induction heater?

On this page, induction heater and electromagnetic heater describe the same heating method: an energized winding induces currents in a metal heating tube. This is a flow-through process heater, not an induction tool for bearing installation or metal hardening.

Can it handle water-cut crude oil and sand-bearing fluid?

Yes. The design can be configured for crude oil and water-cut produced liquids after reviewing viscosity, solids, water chemistry and scaling tendency. Drainage access helps maintenance; it does not replace a sand separator or remove the need for periodic cleaning.

Does oil contact the energized coil?

The induction winding is separated from the process fluid. Heat crosses the metal tube wall into the fluid, so that wall can still foul or overheat if flow is lost. Electrical isolation does not eliminate the need for hazardous-area design and independent protective shutdown.

Can it be supplied as a skid-mounted package?

Yes. Multiple heating units can be integrated with skid piping, valves, instruments, insulation and control cabinets. The Xinjiang Oilfield case below is a 600 kW package reference, not a universal rating for every heater unit.

Do you manufacture induction heaters in China for overseas projects?

Yes. XGTHERMAL is a China-based manufacturer of explosion-proof induction heaters and packaged oilfield heating equipment. We support project-specific engineering, technical documentation and export-oriented communication for overseas procurement teams.

What certification documents can be supported?

Applicable Ex and pressure-equipment documentation is agreed during selection. ATEX, IECEx or EAC assessment can be coordinated when required; a route is not an existing certificate for every configuration. If JIP33 S-723 is specified, the EPC must review its applicability because its primary scope is resistance-type heater bundles.

Request the induction heater datasheet

Share your operating conditions and our team can provide a project-specific datasheet or preliminary selection notes.

Request Datasheet

Explosion-Proof Induction Heater