RIKEN KEIKI Flame Arrester A2-04259E

RIKEN KEIKI FLAME ARRESTER A2-04259E

The RIKEN KEIKI A2-04259E is a precision-engineered in-line flame arrester (flame trap element) manufactured in Japan by Riken Keiki Co., Ltd. It is designed for use in hazardous marine and industrial gas sampling lines. Engineered specifically for marine gas detection systems, sequential extractive sampling panels, and inert gas monitoring units installed aboard crude oil tankers, chemical carriers, LNG/LPG vessels, and offshore platforms, the A2-04259E serves as a critical passive explosion-mitigation component.

The device operates by quenching thermal energy below the Maximum Experimental Safe Gap (MESG) and auto-ignition point of flammable hydrocarbon vapors (Group IIA, IIB, and IIC gas mixtures). Constructed from corrosion-resistant 316L stainless steel and marine-grade brass housing, it stops flame flashbacks originating in downstream analyzer manifolds from penetrating upstream extraction lines routed into cargo tanks, pump rooms, ballast tanks, and double-hull void spaces.

Model Details

• Manufacturer: RIKEN KEIKI CO., LTD. (Tokyo, Japan)
• Part Number (MPN): A2-04259E
• Manufacturer Reference: Ref. U3335F / LOC: EWS M1504
• Component Type: High-Pressure Drop In-Line Explosion / Flashback Quenching Arrester
• Origin: Made in Japan

Key Features

1. Sub-Millimeter Quenching Matrix: Features a calibrated 316L sintered stainless steel/crimped metal ribbon core that dissipates thermal energy instantly, blocking deflagration wave fronts across volatile hydrocarbon gas streams.
2. High Chemical & Marine Corrosion Resistance: Robust housing resistant to sour crude vapors H2S heavy marine fuel oil vapors, volatile organic compounds (VOCs), and saline atmospheres.
3. Hermetic Sealing Interface: Precision machined threads and integrated Viton / FKM elastomer O-rings prevent ambient air ingress or fugitive sample gas egress under negative or positive extraction pressures.
4. Rapid Clean-and-Inspect Architecture: Compact, modular inline body permits rapid disassembly, solvent ultrasonic cleaning, optical mesh inspection, and re-torquing during routine class surveys.

Equipment Compatibility

The Riken Keiki A2-04259E flame arrester is fully compatible with the following marine and fixed industrial systems:

• Fixed Extractive Gas Detection Panels: Riken Keiki sequential gas sampling systems (including custom and standard marine multi-point cabinets for tankers).
• Marine Cargo & Pump Room Monitoring: Riken Keiki models RX-415, RX-515, RX-8000, and RI-series continuous gas monitoring consoles.
• Fixed Gas Detector Heads / Transmitter Flow Adaptors: Compatible with sample-draw adapter kits for SD-1, GD-A80, GD-70D, and GD-D58 detector transmitters deployed in hazardous Zone 0 / Zone 1 / Zone 2 environments.

Applications

• Crude Oil & Product Tankers: Sampling suction lines for cargo tanks, pump rooms, cofferdams, pipe tunnels, and double bottom / ballast tanks.
• LPG / LNG Carriers: Boil-off gas (BOG) analyzer sampling circuits, compressor room atmosphere monitoring, and airlock gas containment lines.
• FPSO / FSO & Offshore Rigs: Continuous multipoint vapor sampling headers entering gas analyzer shelters located in safe deck areas.
• Chemical Processing & Industrial Terminals: Vapor return monitoring systems, flare gas sample extraction points, and solvent recovery plants.

Frequently Asked Questions

What is the primary function of the Riken Keiki A2-04259E flame arrester?

The Riken Keiki A2-04259E is an in-line safety device designed to quench deflagrations and prevent flame propagation along gas sampling pipes that connect hazardous spaces (such as cargo tanks or pump rooms) to gas detection and analyzer systems located in safe machinery spaces.

How do I know when the A2-04259E flame arrester needs replacement or cleaning?

Signs of a restricted flame arrester include low sample flow alarms on your gas detection panel, unusually long sample travel times from remote cargo tanks, or a noticeable pressure drop across the filter housing during routine flow meter calibration.

Can the internal element of the A2-04259E flame arrester be cleaned, or must it be replaced?

The arrester element can be cleaned using non-corrosive solvents and an ultrasonic bath, provided the metallic matrix is undamaged and free of physical corrosion. However, if the sintered mesh is deformed, clogged with unremovable baked-on carbon/polymerized crude deposits, or chemically eroded, it must be replaced immediately to maintain explosion-proof safety integrity.

Is the Riken Keiki A2-04259E compatible with both positive and negative pressure sampling lines?

Yes. The A2-04259E is engineered with high-integrity Viton and PTFE seals, enabling airtight performance under deep suction (vacuum draw from extraction pumps) as well as moderate positive operating pressures up to 0.2 MPa (2 bar).

What gas groups does the A2-04259E protect against?

The unit is designed to quench explosive mixtures classified under IEC Gas Groups IIA, IIB, and standard volatile marine hydrocarbon atmospheres, including methane, propane, butane, and gasoline/crude oil vapor mixtures.