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PRESSURE VACUUM VALVES

Model100

Model No: 100

Storagetech™’s Model 100 Pressure Vacuum Relief Valve provides protection to bulk storage tanks and vessels from over and under pressurisation. The valves are mounted on the tank roof flange or a vent pipe from the vapour space.

In the closed position the pressure relief pallet and diaphragm assembly is held tightly against a seal to prevent the loss of vapour to the atmosphere. As the internal pressure in the tank increases, due to product filling and vapour development, the pressure in tank increases and in the event that the set pressure of the unit is reached, the diaphragm will open and discharge the gas to the atmosphere. The opening set-point is selectable from a range +2.0 mbar and +60 mbar. (+0.8 inch W.C and +24 inch W.C), and the valve will reseal when the tank returns to a safe pressure.

The vacuum pallet and diaphragm assembly is similarly maintained in the closed position. As the internal pressure in the tank reduces, due to emptying, the balance between the tank pressure and the external atmospheric pressure changes, and when the set pressure of the unit is reached, the diaphragm opens to admit air and rebalance the internal pressure. The vacuum set-point is selectable from a range between +2.0 mbar and +60 mbar. (+0.8 inch W.C and +24 inch W.C).The valve will reseal when the tank returns to a safe pressure.

Several features are inherent in the valve design to ensure a smooth, positive and effective operation. The body is self-draining and drip rings prevent condensate from settling on seating surfaces. A diaphragm and seal manufactured from Teflon reduce the possibility of ice formation and sticky residues hindering the valve from opening, while the pallet assembly moves freely on guideposts. The outlet port is protected by a weather hood and mesh guard to prevent ingress of debris that might obstruct the opening, while a mesh filter screen in the vacuum inlet port performs the same function.

     
Model101

Model No: 101

ERGIL Storagetech™’s Model 101 Pressure Vacuum Relief Valve provides protection to bulk storage tanks and vessels from over and under pressurisation. The valves are mounted on the tank roof flange or a vent pipe from the vapour space.

In the closed position the pressure relief pallet and diaphragm assembly is held tightly against a seal to prevent the loss of vapour to atmosphere. As the internal pressure in the tank increases, due to product filling and vapour development, the pressure in tank increases and in the event that the set pressure of the unit is reached, the diaphragm will open and discharge the gas to atmosphere. The opening set-point is selectable from a range between +61 mbar and +1000 mbar (+24 inch W.C. and 400 inch W.C.), and the valve will reseal when the tank returns to a safe pressure.

The vacuum pallet and diaphragm assembly is similarly maintained in the closed position. As the internal pressure in the tank reduces, due to emptying, the balance between the tank pressure and the external atmospheric pressure changes, and when the set pressure of the unit is reached, the diaphragm opens to admit air and rebalance the internal pressure. The vacuum set-point is selectable from a range between +61 mbar and +1000 mbar (+24 inch W.C. and 400 inch W.C.). The valve will reseal when the tank returns to a safe pressure.

Several features are inherent in the valve design to ensure a smooth, positive and effective operation. The body is self-draining and drip rings prevent condensate from settling on seating surfaces. A diaphragm and seal manufactured from Teflon reduce the possibility of ice formation and sticky residues hindering the valve from opening, while the pallet assembly moves freely on guide posts. The outlet port is protected by a weather hood and mesh guard to prevent ingress of debris that might obstruct the opening, while a mesh filter screen in the vacuum inlet port performs the same function.

     
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FLAME ARRESTORS

Model300

Model No: 300

ERGIL Storagetech™’s Model 340 Vertical In-line Deflagation Flame Arrestor (also called flame arrestor or fire arrestor) is intended for pipeline installation close to the source of any potential ignition source by minimising flame speed and the development of an explosive pressure.

The flame quenching element is designed to be three or four times the area of the pipe in which it is installed, and is assembled between two flanged reducing spools. The element comprises a tightly rolled scroll or scrolls of crimped stainless steel ribbon to form passages through which the vapour passes. The area of each passage determines level of protection that the element provides. ERGIL Storagetech™’s Model 300 In-line Deflagration Flame Arrestor has a Maximum Experimental Safe Gap as per standard, and is suitable for gas groups IIB and IIA.

Under normal operation the flame element allows the bi-directional flow of air and flammable vapour, however it introduces additional pressure loss, and this must be considered in the design of the system. If a fire or ignition occurs external to the equipment and ignites the flammable discharge, the flame arrestor will quench the leading fire by absorbing and dispersing the heat as it passes through the element.

The unit is supplied with an earth point, copper tag and cable. Periodically the cell can be removed for cleaning or replacement.

The MODEL 300 deflagration flame arrestor is suitable for quenching subsonic flames and should be mounted in the vertical plane, close to the source of any potential ignition. It is suitable for use with any of ERGIL Storagetech™’s Pressure Relief, and Pressure-Vacuum Valves, and should be installed on the inlet to the Pressure Relief unit.

     
Model320

Model No: 320

ERGIL Storagetech™’s Model 320 In-line Detonation Flame Arrestor (also called flame arrestor or fire arrestor) is designed for installation in gas pipelines. Detonation occurs when a flame travelling through the pipeline reaches supersonic velocities, usually as a result of the pipeline configuration or pipeline surface roughness. Changes in gas density and pressure causes the flame velocity to metamorphose from subsonic to supersonic.

The flame quenching element is designed to be three or four times the area of the pipe in which it is installed, and is assembled between two flanged reducing spools. The element comprises a tightly rolled scroll or scrolls of crimped stainless steel ribbon to form passages through which the vapour passes. The area of each passage determines level of protection that the element provides. ERGIL Storagetech™’s Model 320 In-line Detonation Flame Arrestor has a maximum experimental safe gap (MESG) as per the standard, and is suitable for gas groups IIB and IIA.

The detonation flame arrestor is more robust than the deflagration flame arrestor, and contiguous scrolls have smaller MESGs to withstand higher pressures and to quench detonations. It should be installed in the pipeline where there is a significant distance between the unit and the potential source of ignition.

The unit is supplied with an earth point, copper tag and cable. Temperature sensor can be provided upon request. The element can easily be removed for cleaning or replacement.

     
Model301

Model No: 301

Flame arrestors ( also called flame arrestor) are passive devices that prevent the propagation of a flame or fire from entering into an opening in a pipeline or vessel discharging flammable vapour.

The flame quenching element is designed to be three or four times the area of the pipe in which it is installed, and is assembled between two flanged reducing spools. The element comprises a tightly rolled scroll or scrolls of crimped stainless steel ribbon to form passages through which the vapour passes. The area of each passage determines level of protection that the element provides. ERGIL Storagetech™’s Model 300 In-line Deflagration Flame Arrestor has a Maximum Experimental Safe Gap as per standard, and is suitable for gas groups IIB and IIA.

Under normal operation the flame element allows the bi-directional flow of air and flammable vapour, however it introduces additional pressure loss and this must be considered in the design of the system. If a fire or ignition occurs external to the equipment and ignites the flammable discharge, the flame arrestor will quench the leading fire by absorbing and dispersing the heat as it passes through the element.

The unit is supplied with an earth point, copper tag and cable. Periodically the cell can be removed for cleaning or replacement.

The MODEL 300 deflagration flame arrestor is suitable for quenching subsonic flames and should be mounted in the horizontal plane, close to the source of any potential ignition. It is suitable for use with any of ERGIL Storagetech™’s Pressure Relief, and Pressure-Vacuum Valves, and should be installed on the inlet to the Pressure Relief unit.

     
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EMERGENCY RELIEF VALVES & GAUGE HATCHES

Model210

Model No: 210

ERGIL Storagetech™’s Model 210 Lockable Gauge Hatch has a locking-screw to prevent inadvertent or unauthorised opening. Operated by foot or knee, it leaves the operator hands-free to dip the tank’s contents for depth, take product samples, and obtain temperature measurements.

Designed as a non-sparking unit the lockable gauge hatch is bolted to a tank roof flange, the hatch offers simple and easy access to the vapour space of bulk storage tanks.

     
Model200

Model No: 200

ERGIL Storagetech™’s MODEL 200 Gauge Hatch offers a simple and easy access into the vapour space of bulk storage tanks. Opened by foot or knee, it leaves the operator hands-free to dip the tank’s contents for depth, take product samples, and obtain temperature measurements.

The Gauge Hatch is bolted to a tank roof flange. Thanks to its spark free design, offers safe operation.

     
Model400

Model No: 400

(Weight Loaded) The Model 400 Weight-loaded Emergency Relief Vent operates in the last resort when a vessel or storage tank is exposed to a large-scale fire, and the standard pressure relief valve has failed to open or cope with the extreme conditions.

Designed to open in the event of high pressure, the set-pressure should be chosen to be above that of the pressure or pressure-vacuum relief valve. When the set-pressure is reached, the vent cover rises sufficiently to dissipate the pressure in the tank. As the pressure returns to normal, the cover closes and reseals, thereby preventing any further loss of vapour from the tank or vessel.

There is a choice of pressure release settings to enable a selection close to the maximum working pressure of the vessel.

The weight-loaded emergency pressure relief vent is installed in the horizontal plane on a flange at the top of the tank. A secondary use of the unit is to access the tank for product sampling or depth gauging.

     
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CONTACT

OFFICE

mail Email: sales@pwtech.co.th

open Open: Mon - Fri | 08:30 - 17:30 ( Head Office )

open Open: Mon - Sat | 08:00 - 17:00 ( Rayong Branch )

Head Office

PW TECH Company Limited

219/35 Moo 4 Chaengwattana Rd., Pak Kret,

Pak Kret, Nonthaburi 11120 Thailand

TEL: +66 2 584 3355 | FAX: +66 2 583 3405

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Rayong Branch

PW TECH Company Limited

95/1-2 Moo 3, Namkok,

Mueang, Rayong 21000 Thailand

TEL: +66 38 015 381-4 | FAX: +66 38 015 385

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