Increased Safety Pre-purging System | Chemical Explosion-proof Gas Replacement Equipment

Our increased safety pre-purging system fits chemical, oil & gas, pharmaceutical explosion-prone sites, fully compliant with Ex e safety standards. It performs automatic pipeline gas replacement before operation to eliminate flammable residues and explosion hazards. Equipped with precise pressure & flow sensors, adjustable purge cycle, compatible with reactors, transfer pipelines and sealed storage tanks. Built-in self-check and audible-visual alarm, low power consumption and long service life. Certified by national explosion-proof authority, ideal for Zone 2 hazardous area continuous operation.

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Ex e Increased Safety Pre-purging Device Explosion-proof Ventilation Purification System

Essential pre-purging equipment for industrial hazardous gas operations, engineered for explosive gas environments. Ex e enclosure prevents electric spark risks with fully automatic closed-loop purge control without manual intervention. Compatible with nitrogen and inert purge media with real-time visual flow monitoring and delay purge function for thorough gas replacement.

Light modular design for easy on-site installation, widely used in fine chemical, coating and lithium battery workshops, fully complying with safety standards to cut plant accident risks.

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TYEA-6ZA Pre-start Purging System Complete Explosion-proof Pre-purging Device for Motor Enclosure

The TYEA-6ZA pre-start purging system purges the enclosures of Exe/Exn or non-explosion-proof motors, eliminating explosion risks caused by ignition sparks generated during equipment startup when flammable and explosive onsite gases penetrate the motor interior.
This system consists of two modules: a control unit and a pressure relief unit (as shown in the above figure). The control unit regulates the supply of compressed gas and verifies purge flow rate, pressure and duration. The pressure relief unit acts as a safe exhaust outlet for purge gas and outputs a signal to feedback flow parameters of gas inside the motor enclosure; a flame arrester is built into the pressure relief unit. After motor purging is completed, the system maintains a set pressure until the motor is started.

Specification Description of Control Unit and Pressure Relief Unit (See Appendix Table 2)

The TYEA series increased safety purge system has three flow specifications: TYEA-2ZA, TYEA-6ZA and TYEA-8ZA, matched with standardized control cabinet and RLV relief valve unit. Each model adopts differentiated design on overall dimensions, air inlet ports and unit weight to perfectly fit installation conditions of increased safety explosion-proof motors with various cavity volumes.

1. TYEA-2ZA (Low-flow Model, for 500/1000/1500 NL/min purge demand)

The control cabinet is 386mm wide, 850mm high and 596mm thick, with a 177mm nozzle and 570mm standard mounting height. It adopts a 3/4m air inlet port, and the supporting RLV relief valve unit is 230mm wide and 280mm thick. The control unit weighs 16kg, same as the relief valve unit. With balanced size, it matches small and medium-sized increased safety explosion-proof motors.

2. TYEA-6ZA (Medium-flow Model, for 2000~6000 NL/min purge demand)

The cabinet is 480mm wide, 425mm high and 623mm thick, equipped with a 177mm nozzle and unified 570mm mounting height. It comes with a single 1×NPT standard air supply port, and the RLV relief valve unit is 330mm wide and 145mm thick. The control unit weighs 27kg while the supporting relief valve unit reaches 60kg with stronger bearing capacity, ideal for large motor cavities requiring high-volume gas exchange.

3. TYEA-8ZA (High-flow Model, for 7000~12000 NL/min purge demand)

The cabinet is 386mm wide, 350mm high and extended to 766mm in thickness, fitted with an extended 267mm nozzle and 496mm mounting height. Dual 2×NPT air inlet ports guarantee sufficient high-flow air supply, and the RLV relief valve unit is 240mm wide and 288mm thick. The lightweight control unit only weighs 7kg with a 23kg relief valve unit, specially developed for fast pre-purge of large-capacity explosion-proof motors.
All models support vertical fixed installation, with anti-corrosion 316 stainless steel cabinets and customizable air port specifications. Covering the full flow range of 500-12000 NL/min, they are widely used to support various increased safety explosion-proof motors in Zone 2 hazardous chemical and petrochemical sites.

Installation Diagram

The system installation components are shown in the figure below, which must comply with the specific requirements specified in the product operation manual.

  1. Rigid metal pipes are recommended for air piping connections. The air supply pipes and fittings are specified as follows:
  • Model 2ZA: 3/4″ NPT(F) threaded connection, minimum air supply pipe size 20mm (3/4″);
  • Model 6ZA: 1″ NPT(F) threaded connection, minimum air supply pipe size 25mm (1″);
  • Model 8ZY: 2″ NPT(F) threaded connection, minimum air supply pipe size 50mm (2″);

    Gas signal pipe: 1/8″ NPT(F).

  1. The pressure relief unit shall be properly positioned with the exhaust port facing downward.
  2. The power supply for remote startup of the purging system must be 24V DC, with power connected to terminal No.1 and No.2.

Indication and Control

The system operating status is displayed locally via indicator lights on the control unit; status signals are remotely transmitted through dry switch contacts.

Local Indication for TYEA-EA:

Red / Green: Power Disconnected / Purging Completed

Black / Yellow: System Timed Purging Inactive / System Timed Purging In Progress

Remote Control Wiring

System operating status is remotely transmitted via dry switch contacts constructed with flameproof switches, suitable for hazardous explosive areas. The wiring diagram is shown below:
  1. Terminals 1-2 connect to 24V DC for remote solenoid valve startup (outputs a 2–5 second current pulse to actuate the solenoid valve).
  2. Terminals 3-4 close during system purging and open under all other operating conditions.
  3. Terminals 6-7 close once purging finishes, and remain closed until the air supply is cut off or a new purging cycle restarts.

Model Code Definition & Basic Technical Parameters

Tovent TYEA increased safety purge system is developed exclusively for increased safety explosion-proof motors, with full unit explosion-proof mark Ex db eb ia II C T5 Gb and IP54 overall protection. It adopts fully pneumatic pre-start purge operation mode, compatible with clean oil-free compressed air and inert gas with supply pressure of 4-10bar. The purge flow ranges from 500 to 12000NL/min, and purge time is steplessly adjustable from 0 to 99 minutes to match increased safety motors of different volumes. The corrosion-resistant 316 stainless steel housing supports vertical fixed installation. Multiple flow codes including 2ZA/6ZA/8ZA are available for selection. The full series supports customization on flow, time and interfaces, widely applied for motor explosion protection in Zone 2 gas hazardous chemical and petrochemical plants.

TYEA Increased Safety Purge System

Application Fields & Applicable Scenarios
  • Petroleum & Refining Industry: Zone 2 hazardous areas of refineries and oil & gas gathering stations, matched with increased safety main drive motors. It replaces flammable oil & gas inside cavities before startup to avoid explosion risks from ignition sparks.
  • Fine Chemical Parks: Pharmaceutical, coating and resin workshops with volatile flammable gases like ethanol and acetone, providing protection for stirring and conveying explosion-proof motors.
  • Coal Chemical Industry: Coal-to-olefin and coking plants with mixed hazardous coal gas and hydrogen, serving as pre-purge safety protection for high-power increased safety motors.
  • Natural Gas Stations: City gate stations, compression stations and LNG vaporization stations where leaked natural gas accumulates easily, offering explosion-proof purge protection for fan and compressor matched motors.
  • Fertilizer & Chemical Plants: Ammonia synthesis and methanol workshops with high-risk ammonia and methanol vapor, keeping motor inner cavities free of explosive media steadily.
  • New Energy Lithium Battery Plants: Electrolyte and cathode material workshops where organic solvents form explosive mixed gas, protecting all kinds of increased safety drive motors in workshops.
Six Core Advantages
  • Complete Explosion-proof Certifications, Top Safety GradeFull unit explosion-proof mark Ex db eb ia II C T5 Gb with IP54 overall protection, suitable for II C highest-risk gas like hydrogen and acetylene, complying with GB/T3836.5 national explosion-proof standard.
  • Full Flow Range Coverage, Compatible with Multiple MotorsThree flow models 2ZA/6ZA/8ZA cover purge flow from 500 to 12000NL/min, matching micro small motors up to large industrial increased safety motors.
  • 316 Stainless Steel Construction, Anti-corrosion & Long Service LifeControl cabinet, pipelines and nozzles are all made of 316 stainless steel, resisting acid, alkali, moisture and chemical corrosion, supporting long-term continuous operation in outdoor and corrosive workshops.
  • Fully Pneumatic Design without Electric Control, Intrinsically SafeNo built-in circuit boards or external power supply, fully driven by air source. It completely eliminates electric spark risks and runs safely even under power failure conditions.
  • Fully Customizable Parameters, Customized MatchingStepless adjustable purge time from 0 to 99 minutes; air ports, nozzle length and installation dimensions are customizable. Vertical installation saves limited on-site layout space.
  • Split Modular Structure, Easy MaintenanceSeparated independent design of control unit and RLV relief valve unit. Modular parts are easy to disassemble, enabling quick inspection and replacement to cut later maintenance time and cost.
Long-service Stable Increased Safety Pre-purging System Long-term Supporting Explosion-proof Safety Device

Durable long-life pre-purging system adopting imported Ex e core electrical parts, dustproof, waterproof and impact-resistant for year-round non-stop operation. Safety interlock system requires no major overhaul within 10 years to cut maintenance costs, suitable for 24-hour continuous chemical production without full-time operators. Remote fault alert available with abundant project cases across national chemical parks, professional technical team supports full equipment lifecycle to guarantee stable plant explosion safety.

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  • Our old pipelines failed safety inspections without purge gear. This Ex e pre-purging system has reliable interlock and saves nitrogen, we passed acceptance on the first try, after-sales technicians were super patient during on-site commissioning.

  • We’ve run this unit in our Zone 2 pharmaceutical workshop for half a year, no spark risks at all. Its auto purge concentration monitor works accurately and cuts down labor for our explosion safety management.

  • We customized this pre-purging unit for reactors. Modular disassembly is handy, the housing stays rust-free in corrosive conditions, complete explosion certificates make it well-received by our overseas project clients.
  • We ordered standard pre-purging units for our overseas chemical project, fast delivery with full English explosion test documents with zero obstacles during local safety inspection.

     

  • Our powder chemical plant handles lots of flammable materials. This purge system triggers audible-visual alarms instantly with thorough gas replacement, eliminating past pipeline deflagration hazards completely.

Produits apparentés

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