Protectoseal 833H Combination Conservation Vent & Flame Arrester


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End-of-Line Conservation Vent & Flame Arrester Suitable for use with NEC Group D (IEC Explosion Group IIA) Vapors

● Settings achieved by weight loading ● Sizes 2″ (DN 50) through 10″ (DN 250) ● Suitable for unconfined, NEC Group D (IEC Group IIA)

vapor deflagrations

● Reduces costly evaporation losses

● Single body construction with external flame arrester ● Leakage rate of less than 1 SCFH of air at 90% of

set point

● Patented, FEP film “Air-Cushioned Seating” ● Low-leak pallet design – certified test reports ● Factory tested / certified for leakage and correct settings ● Available in Aluminum, Ductile Iron and Stainless Steel


The Protectoseal Series No. 830 Combination Conservation Vent and Flame Arrester is designed to provide pressure and vacuum relief to maintain tank’s vapor space within safe operating parameters. Vent settings minimize loss of product. Under pressure venting conditions, tank vapors are expelled to atmos- phere. Also serves as an End-of-Line Flame Arrester to protect tank’s vapor space from external sources of ignition.


Pallets in vent housing minimize air and vapor loss as the tank “breathes”. They open and close just enough to maintain safe working pressures and avoid damage to the tank. An integral flame arrester protects tank contents against fire and explosion caused by exterior sources of ignition. Rectangular plate-type flame arrester element(s) are mounted external to pallet assem- blies for ease of use and are only exposed to vapors when venting.

Guided pallet assemblies insure proper alignment on the seat and smooth lifting and reseating action.

Optimized Performance Vents™

Protectoseal’s “Optimized Performance Vents” incorporate patented features that provide the optimum overall vent perform- ance with regard to sealing, set point, flow and resealing (blow down).


Fast Inspection, Easy Maintenance. “Swing bolt design” permits removal of the vent housing cover and/or weatherhood(s) for easy, convenient handling for inspection and maintenance.

Maintains Accurate Pressure Settings. Set points are accurate to within +/- 3% across the entire range of available settings. Units may be weight loaded for use on installations requiring higher settings.

Air-Cushioned Seating. A flat, smooth diaphragm of FEP film is supported on both sides of an annular channel to form a floating air seal with the seat. An outer support rim assures proper seating.

Automatic Condensate Drainage. Vertically mounted, rectangu- lar plate-type flame arrester is employed for self-drainage of con- densate. Grids are mounted externally and are only exposed to vapors when venting.


Low-Leakage. Vent leakage is no more than 1 SCFH at 90% of the set pressure.

Positive Flame Arresting. Correct air spacing between the indi- vidual plates is assured through a series of precision embossings on the face of each plate. Each plate is fabricated from heavy gauge metal to resist distortion during cleaning and reassembly.

Sizes Available. 2″ (DN 50), 3″ (DN 80), 4″ (DN 100), 6″ (DN

150), 8″ (DN 200) and 10″ (DN 250). Please refer to dimension chart on reverse for flange connection options.

Test Lab Listings. Approved by Factory Mutual Research (FM) in 2″, 3″, 4″, 6″ and 8″. Listed by Underwriters Laboratories (UL) in 6″, 8″ and 10″. For arresters that meet ATEX Directive 94/9/EC and ISO Standard 16852, please refer to Series 830E.

PRO-FLOW ® Sizing and Selection Software.

Use PRO-FLOW ® to select the correct size unit for pressure and vacuum relief calculated in accordance with API 2000, ISO 28300, NFPA 30 and OSHA 1910.106.

Quality Assurance. Each unit is factory tested for leakage and correct settings to meet Protectoseal’s high standards prior to shipment.


A comprehensive range of materials is offered as shown in the chart below. Other materials and features can be furnished upon request.

Available Options.

‰ Alternate diaphragm materials

‰ Material certifications for castings

‰ Lower than standard minimum pressure and /or vacuum setting

Pallet Flame Arrester Series Housing Pallet Diaphragm Grid Assembly 830 Aluminum 356 Aluminum FEP Film Aluminum C830 Ductile Iron 316 S.S. FEP Film 316 S.S. E830 Aluminum 356 Aluminum FEP Film 316 S.S (Alum. Frame) F830 316 S.S. 316 S.S. FEP Film 316 S.S.

RE830 Aluminum 356 316 S.S. FEP Film 316 S.S. (Alum. Frame)

Note: Aluminum flanged to mate with 125# ANSI and DIN PN 16 flat face flanges. All other materials mate with 150# ANSI and DIN PN 16 raised face flanges.

Additional information

Weight 60 lbs
Dimensions 24 × 24 × 16 in