DURAG D-HG 400 High Energy Ignition Device

Overview

The DURAG D-HG 400 is a high-energy ignition device built to reliably ignite oil and gas burners in industrial combustion systems, from steam generators to flare stacks. Rather than relying on a standard low-energy spark igniter that can struggle in harsh burner environments, the D-HG 400 stores 4.5Ws of energy in a high-voltage capacitor and discharges it through a thyristor switch to deliver a strong, consistent 1,500-volt spark at the ignition tip.

As part of DURAG’s established combustion ignition range, the D-HG 400 is engineered for demanding startup conditions where reliable first-attempt ignition matters for both safety and process efficiency. Seven Star LLC supplies the DURAG D-HG 400 as a trusted DURAG instrumentation supplier to power, refining, and process facilities across Oman and the GCC.

Operating Principle

The D-HG 400 charges its internal high-voltage capacitor and discharges it through a thyristor switching circuit to the ignition lance tip, generating a series of high-energy sparks. During the critical first minute of burner startup, it fires at approximately 20 sparks per second to maximize ignition probability, then drops to a steady-state rate of approximately 5 sparks per second for continued pilot or main-flame ignition support. The ignition tip is rated for roughly 1 million sparks, equivalent to about 14 continuous hours of operation at the initial 20 sparks/second rate.

Engineering Design of the DURAG D-HG 400

The D-HG 400 is supplied for 115 VAC or 230 VAC, 48-60 Hz mains supply. Standard ignition lances come with a 3m cable length, with custom lengths down to 700mm available for tighter installations, and a lance diameter of 22mm (25mm reinforced option for higher-stress installations). The device operates across an ambient temperature range of −20°C to +60°C, with Ex-rated models limited to a maximum surface temperature of 85°C, and is available in Ex versions with ATEX and IECEx certification.

Key Features

• 4.5Ws stored energy, 1,500V spark output at the ignition tip
• 20 sparks/second initial rate, ~5 sparks/second steady-state
• Ignition tip rated for ~1 million sparks (~14 hours continuous)
• 115 VAC or 230 VAC, 48-60 Hz supply
• Standard 3m cable, custom lengths from 700mm
• 22mm lance diameter, 25mm reinforced option
• Operating range −20°C to +60°C
• ATEX and IECEx certified Ex versions

Industrial Applications

The D-HG 400 is specified for burner ignition in steam generators, cement kilns, refinery process heaters, waste incinerators, and flare stack pilot ignition systems across Muscat, Sohar, and Salalah, where reliable first-attempt ignition reduces startup delays and unburned-fuel safety risk. Its explosion-proof-rated variants make it suitable for hazardous-area burner installations.

Across the GCC’s power generation, refining, and cement sectors, the D-HG 400’s high spark energy and rapid initial firing rate are particularly valued for difficult-to-ignite fuels or burners operating in high-airflow conditions where a lower-energy igniter would struggle to establish a stable flame on the first attempt.

Technical Specifications

Request a Quote for DURAG D-HG 400 High Energy Ignition Device

Contact Seven Star LLC for pricing and availability on the DURAG D-HG 400 high-energy ignition device across Oman and the GCC. Our team can help configure the correct power supply, lance length, and certification for your burner application.

Specifying a D-HG 400 Replacement

The D-HG 400 is supplied in several versions, so a like-for-like replacement starts with the type label on the existing unit. Record the full type designation and serial number, the supply voltage and frequency, the ignition lance length and tip style, and the hazardous-area certification marked on the enclosure. It is also worth confirming how the igniter is triggered by the burner management system and the length and routing of the high-voltage ignition cable, since both affect whether the new unit drops straight into the existing installation.

Installation and Commissioning

• Install the lance so the tip sits in the fuel–air mixing zone recommended by the burner manufacturer, not in the direct flame path during normal firing.
• Use only the specified ignition cable and connectors, keep bend radii generous and route the cable away from signal and control wiring.
• Earth the device and lance according to the manual; poor earthing is a common cause of weak sparks and electrical interference.
• Verify the BMS ignition window and trial-for-ignition timing before the first light-off, then confirm reliable ignition over several start attempts.
• In hazardous areas, check the certification, cable glands and enclosure sealing match the zone before energizing.

Maintenance and Troubleshooting

The ignition tip is a wear part. Inspect it during planned burner maintenance for erosion, carbon deposits or oil wetting, and replace it before it reaches the end of its rated life on critical burners. If ignition becomes unreliable, work through the chain in order:

• Confirm supply voltage and the ignition command from the BMS are present
• Check the spark audibly or visually with the lance withdrawn under a safe work procedure
• Inspect the ignition cable and connectors for insulation damage or moisture
• Clean or replace a fouled or eroded tip
• Review fuel pressure, atomizing media and air flow, since poor mixture is often mistaken for an igniter fault

Applications in Oman and the GCC

High-energy igniters are used on package boilers, fired heaters, thermal oxidizers, gas turbine auxiliary burners and flare pilot systems across Oman’s refineries, gas processing plants and power stations. Reliable first-attempt ignition reduces purge cycles and nuisance trips during start-up.

Sourcing Through Seven Star LLC

Send the type label details and application data to Seven Star LLC for a quotation on genuine DURAG ignition devices, lances and tips, supplied with available documentation to sites across Oman and the GCC.

Browse the full DURAG range or see more Fire & Gas Detector products supplied by Seven Star LLC in Oman and the GCC.