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 - Mr Mai Nghĩa -

< Sales  Engineer>
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For over 85 years Protectoseal has been an industry pioneer and leading manufacturer of quality products that conserve and control volatile emissions and protect low pressure storage tanks, vessels and processes from fire and explosion.
Our integrated line of pressure and vacuum relief vents, flame/detonation arresters and related vapor control devices are used primarily in process industries. For a full list of industries, click here.
Vents that are specifically designed to prevent storage tank damage by relieving internal pressure and vacuum accumulations that occur as a result of day-to-day operations (filling, emptying and atmospheric temperature changes). These products also minimize product evaporation losses.
Emergency Vents are designed to prevent the catastrophic rupture of a storage tank by relieving the internal pressure accumulation caused by external fire involvement of the tank.
PIN-TECH® Pressure Vents are designed and tested to address concerns about the leakage of fugitive emissions prior to set point.
Flame and Detonation Arresters provide a positive barrier against the propagation of a flame through a piping system or into a storage tank’s vapor space.
Flame and Detonation Arresters that conform to European Standard EN12874 and ISO16852.
Blanketing Valves sense the pressure in a tank’s vapor space and regulate a supply of pressurized inert gas into the tank so that a desired pressure range may be consistently maintained.
Liquid Level Indicators are used for accurate liquid level gauging of fixed or floating roof storage tanks. Suitable for water, oils, solvents and other products.
Miscellaneous equipment required for the safe and efficient operation of storage tanks and related processing facilities. Products include: Air Dryers, Gauge Hatches, Internal Safety Valves, Overflow Valves, Water Drain Valves and more.
Combination safety fill cap, flash arrester and pressure / vacuum relief device designed for installation in fuel tank openings of gasoline or diesel-powered equipment.
Heat actuated safety shut-off valve is specifically designed for installation in the withdrawal lines of flammable or combustible liquid storage tanks.

Pressure and Vacuum Relief Vents

Pressure / Vacuum Conservation Vents are employed where it is necessary or desirable to reduce evaporation of tank contents to atmosphere. These vents are generally designated as the conservation type. They are typically mounted to a flange or pipe that connects to the vapor space (space within the tank that is above the liquid surface) of a storage tank. The pressure in this vapor space increases or decreases as liquid is pumped into or out of the tank, respectively. Atmospheric temperature changes cause an expansion or contraction of the vapors in this space, again resulting in pressure increases or decreases. These vents are factory set to your specifications so that the pallet assemblies in the housings open when specific pressure and vacuum levels are sensed. The set points for these vents are achieved either by weight loading or spring loading of the pallet assemblies, depending on the setting required. The tank's vapor space pressure/vacuum works in opposition to the force (weight or spring) applied to the pallet assemblies. Once the excess pressure or vacuum condition has been relieved, the pallet assemblies reseal automatically. The tank's vapor space is always maintained within the safe range of its pressure and vacuum operating design limits.
End-of-Line Vents (shown in drawing above) relieve pressure directly to the atmosphere. Pipe-Away and In-Line Vents are provided with flanged or threaded outlet connections so that vented vapors may be confined and directed through connecting piping for further processing.


In addition to the normal venting capacity provided by Protectoseal's Pressure / Vacuum Relief Vents and/or Flame Arresters, every large above ground flammable liquid storage tank should be provided with some means of relieving excessive internal pressure caused by exposure of the tank to a fire. Depending upon the strength of the tank structure, a vent sized to handle the normal venting requirements (for day-to-day operations) may be inadequate to handle the abnormal vapor efflux generated by heat from an exposure fire.
When a fire occurs near a flammable liquid storage tank, heat transmitted through the tank wall to the contents will cause the liquid to vaporize readily. In the case of petroleum based products, this vaporization may amount to roughly 30 or more cubic feet of vapor for every gallon of solvent vaporized. This generates a relatively high pressure within the confined area of the tank's vapor space. In the absence of sufficient emergency relief a tank rupture could occur, with disastrous effect on life and property and the environment.
Explosions caused by such conditions may be readily avoided by providing adequate emergency relief vents which permit the vapors to escape from the tank. These emergency vents usually include pallet assemblies (as illustrated above) which are weighted to stay closed under normal pressure conditions and which open only when a predetermined pressure is attained, thus relieving the abnormal volume of vapor generated under the fire conditions described above.



Series No. 56000

Series No. 56000, Bubble-Tight <500 ppm Pressure Relief Vents are designed
and tested to address concerns about the leakage of fugitive emissions prior
to set point, and parts per million (ppm) emission rates.
Protectoseal’s PIN-TECH vents are mounted to the vapor space flange connection of a storage tank or vessel. The vents utilize a unique technology that employs a buckling pin to hold the vent piston closed (Fig. 1) with zero leakage up to the relief set point. The pin is an accurately machined, straight metal rod. It is configured to precisely sense transmitted axial forces that are generated as a result of tank pressure. The force required to buckle the pin is governed by Euler’s Law and is a function of the pin’s metallurgy, length and diameter. An exact buckling force can be determined for any specific pin configuration. When the pressure in the tank reaches the vent set point, the axial force is sufficient to buckle the pin and the vent sealing piston is allowed to move to its full open, relieving position (Fig. 2). The pin buckles completely and instantaneously.
Environmental Regulations: Protectoseal's PIN-TECH vents provide a means of complying with the stringent VOC emission requirements mandated by the United States Environmental Protection Agency (EPA) outlined in Code of Federal Regulations (40 CFR).
  • Product Specification Sheet - PDF Spanish | Chinese )
  • Sizes Available: 2" (DN 50) thru 24" (DN 600)
  • Set Point Range: Pressure settings from 1 oz/in² to 15 PSIG.
  • Sealing capabilities to less than 500 ppm
  • End-of-line pressure, end-of-line vacuum and in-line (pipe-away) configurations
  • Relief settings from 1 oz./in.2 15 PSIG
  • Full open at set point
  • Accurate / repeatable set points
  • Reduced maintenance costs
  • Factory tested for leakage and correct settings
  • Optional testing and certification for less than 500 ppm


Flammable liquids are volatile in nature. As they evaporate, they may produce ignitable vapor/air mixtures. Such hazardous conditions are commonly encountered in chemical, petrochemical, petroleum and pharmaceutical plants where the storage, transfer and collection of flammable liquids are part of their daily operations.
Flame arresters and detonation arresters are passive, mechanical device installed on a storage tank nozzle or in a flammable vapor piping system. The arresters' functions are: (1) to allow the passage of vapor under normal operating conditions and (2) to stop and extinguish any flame front propagating through the flammable vapor/air mixture under emergency conditions. Stopping the flame protects the storage tank, or the equipment located in the piping system, from the catastrophic damage that may result from an uncontrolled ignition. A variety of arrester designs are available. The choice of a proper arrester depends on factors such as the location of the arrester with respect to the ignition source and the flammable properties of the vapor/air mixture.
END-OF-LINE flame arresterOne common flame arrester configuration is mounted at the end of a storage tank vent pipe and is identified as an "END-OF-LINE" flame arrester. This arrester permits normal tank breathing, while preventing the flashback of an unconfined deflagration (the ignition of the vapor cloud in the open atmosphere) from flashing back past the arrester into the piping and the tank's vapor space.
"VENT-LINE / IN-LINE flame arresters
Flame arresters are at times mounted directly upstream of pressure / vacuum relief vents, or are connected to short runs of open vent outlet piping. These devices, known as "VENT-LINE / IN-LINE" flame arresters are designed with flanged or threaded mounting connections on both the inlet and outlet. It is possible for a flammable vapor / air mixture to ignite within the confined space of the short outlet pipe or within the vent body. Such an ignition is referred to as a confined deflagration. The flame speed is slow and pressures within the vent piping are relatively low. The Vent-Line / In-Line Flame Arrester is designed to stop this type of flame front. Note: these arresters have very specific limitations as to where they can be properly located within the system.
DETONATION arrestersStrict enforcement of environmental pollution standards has had a dramatic impact on tank storage of flammable liquids. Rather than expelling vapors into the atmosphere, the trend has been toward the connecting or manifolding of multiple tanks through common piping to a central processing unit. These closed piping systems, or vapor recovery / collection systems, have created unique flammable vapor safety hazards. The piping runs in these vapor recovery systems tend to be longer and more complex. Potential sources of ignition may actually be present within the vapor collection system itself. An ignition within a piping system can result in a flame front that accelerates very rapidly and generates extremely high pressures. A low speed, low pressure confined deflagration can readily transition into a high speed, high pressure confined deflagration and then to a detonation, which is a flame front moving at the speed of sound in the vapor/air mixture. "DETONATION" arresters are specifically designed to stop and extinguish detonations, confined deflagrations and unconfined deflagrations. The limitations that are placed on the location of end-of-line and vent-line / in-line flame arresters with respect to the ignition source do not apply to detonation arresters.


  • Type Approved to ATEX Directive 94/9/EC Standards EN 12874 & ISO 16852
  • Models specifically designed for IEC Gas Group IIB3 (NEC Group C), as well as IEC Gas Group IIA (NEC Group D)
  • Wide range of materials of construction
  • Sizes from DN 25 (1") through DN 150 (6")


Tank Blanketing Valves provide an effective means of preventing and controlling fires in flammable liquid storage tanks. Vapors cannot be ignited in the absence of an adequate supply of oxygen. In most instances, this oxygen is provided by air drawn into the tank from the atmosphere during tank emptying operations.
Tank Blanketing Valves are installed with their inlet connected to a supply of pressurized inert gas (usually Nitrogen), and their outlet piped into the tank's vapor space. When the tank pressure drops below a predetermined level, the blanketing valve opens and allows a flow of inert gas into the vapor space. The blanketing valve reseals when pressure in the tank has returned to an acceptable level. The blanketing gas contains no air. No supply of air (Oxygen) is allowed to enter the tank. The vapors, therefore, never form a flammable mixture.
Tank Blanketing Valves help maintain the vapor space in a non-flammable condition, and also provide make-up gas to insure that the tank's vapor space is not subjected to a vacuum.


Series No. 40000 / 41000

Protectoseal Series Nos. 40000 / 41000 Liquid Level Indicators are used for accurate liquid level gauging of fixed roof tanks storing oil, water, solvents and other products. The units are designed for simple, easy installation for "tanks-in-service" or "tanks-out-of-service" and to provide a maximum of trouble-free service. They are especially recommended for applications that require a low cost, low maintenance method of liquid level gauging. Series 40000 / 41000 Indicators are float-actuated, and have a steel target that runs up and down a calibrated board to register the tank liquid contents level. The board is mounted outside of the tank and has bold, legible markings to permit quick, convenient readings.


Series No. 42000B
Protectoseal Series No. 42000B Automatic Tank Gauge provides high gauging accuracy in measuring liquid level in all type of low pressure cone roof, floating roof and underground tanks. They help prevent vapor loss and reduce the time needed for taking readings. The float-operated gauges are compact and have large, legible numerals which permit quick, accurate readings of the displayed liquid level. The gauges may be used on tanks up to 65' high and for pressure ranges up to 50 PSIG. Easy to install, they can be conveniently mounted at the top of the tank or mounted at the side of the tank for ground reading. Float movement activates a negator spring motor that rotates the liquid level indicating wheels to their appropriate positions in the viewing window.


AIR DRYER – SERIES 782 – PDF Spanish | Chinese )
The Protectoseal No. 782 Air Dryer provides a simple, relatively inexpensive means of extracting unwanted moisture from make up air entering a storage tank.

FLASH ARRESTER FILL UNITS – SERIES NOS. 120/150 - PDF Spanish | Chinese )
The Protectoseal Series No. 120 and No. 150 units, when installed in storage tank fill openings, protect tank contents from external ignition sources during filling operations.

Protectoseal Series No. 400 Units install in storage tank rodding and sampling openings and protect tank contents from fire during rodding and sampling operations.

The Protectoseal Series No. 500 Flash Arrester Fill Units are particularly suited for installation in storage tank openings where tanks are filled by direct connection from trucks or railroad tank cars.

GAUGE HATCHES – SERIES NOS. 4960D / 4970D / 4980D / 5960D - PDF Spanish | Chinese )
The Protectoseal Series No. 4970D and 4980D Gauge Hatches provide ready access to storage tanks for gauging or sampling.

INTERNAL SAFETY VALVE – SERIES NO. 3000 - PDF Spanish | Chinese )
The Protectoseal Series No. 3000 Internal Safety Valves are intended for use on storage tanks containing flammable or combustible liquids. Safe and efficient, the valves help protect the tanks and their contents and provide valuable aid in accident prevention.

OVERFLOW VALVE – SERIES NO. 7300D - PDF Spanish | Chinese )
The Protectoseal Series No. 7300D Overflow Valve eliminates an open overfill pipe connection into the vapor space of the tank.

WATER DRAIN VALVE – SERIES NO. 660 - PDF Spanish | Chinese )
Protectoseal Series No. 660 Water Drain Valves are designed to provide maximum flow and assure complete draining when relieving tanks of bottom water accumulated during normal breathing.

Protectoseal Series No. 4276 Rim Vents are designed for use on floating roof tanks. They are mounted around the rim of the tank roof system and provide casual relief for any pressure accumulations under the pontoon sections of the roof.


The Protectoseal combination safety fuel cap, pressure / vacuum relief device is designed for installation in fuel tank openings of gasoline or diesel-powered industrial trucks and equipment such as forklifts, tractors and airport ground support equipment, The perforated metal flash arrester keeps a flame from entering the tank, thereby preventing explosion of the confined vapors within the tank. Safety fittings provide sufficient pressure relief to prevent tank rupture and sufficient vacuum relief to facilitate gas flow from the tank. The spring-loaded, self-closing cap protects against evaporation losses.
New designs available specifically suited to assist in meeting the regulations outlined in EPA 40 - Part 89 - "Control Emissions from Non-Road Large Spark Ignition Engines, and Recreational Engines - Evaporative Emissions".
  • Manually engaged compression spring latch ensures sealing of the large cap opening at low pressures, while also providing automatic pressure relief if the tank pressure increases beyond normal limits (preventing tank rupture). Unique cap design provides vacuum relief to facilitate flow.
  • Designed to accommodate a perforated metal flash arrester which allows flow of liquid into the tank during filling but prohibits entry of an external flame into the connected fill pipe. Screen also serves as a strainer to prevent particulate matter from entering the tank minimizing fuel contamination.
  • Available in various sizes for mounting to standard 1 1/2" through 4" NPS and NPT male and female fill pipe connections, quarter-turn, easy-on flange connections as well as a variety of common mechanical threads
  • Padlock opening prevents theft or unauthorized access. Use of padlock does not impair the automatic pressure relief capability of the spring loaded cap assembly.
  • Durable, lead-free finish, color coded to indicate a specific industry standard storage application: RED designates gasoline; GREEN to designate diesel.
  • Underwriter's Laboratories Listed.
Fuel Tank Safety Caps designed to assist in meeting the requirements outlined in EPA 40-CFR Part 89.

Heat-Actuated Safety Shut-off Valve

safety-shutoffvalve-productThe Protectoseal Series No. U1-45 Heat Actuated Safety Shut-off Valves are specifically designed for installation in the withdrawal lines of flammable or combustible liquid storage tanks. The valves are normally held in the fully open position by a heat-activated element mechanism. In the event of exposure to an external fire source, the element is activated and the valve is closed securely by an internal spring. The flow of liquid through the withdrawal line is stopped.

Easy Installation & Maintenance. Valves are easily installed using standard NPT threaded connections. Integrity of the element is readily verified by visual inspection. Well-proven, functional design minimizes the need for inspection, maintenance or repair activities.
Fully Automatic. Heat activates the valve — shutting off the flow of flammable liquid. Provides additional safety for operating and firefighting personnel. Click Here for typical valve installation and technique.
Rugged, Compact Design. The simple, positive shut-off mechanism is protected by high quality cast bronze housings. Damage to the element head will normally result in positive shut off of the valve. The element assembly can be replaced in minutes without special tools or equipment.
Thoroughly Tested. Each valve is rated for 200 PSIG operating pressure. Elements are provided with nominal temperature ratings of 155°F or 200°F. Tested for positive sealing at the seat, integrity of the castings and all sealed joints.
Test Lab Listings. Approved by Factory Mutual (FM) in all sizes.
Quality Assurance. Each valve is inspected and tested to verify conformance to Protectoseal's high quality standards prior to shipment.

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