Emerson Process Management delivers time-tested and innovative solutions designed to help customers reduce plant maintenance cost, reduce capital requirements, reduce cost of regulatory compliance, and increase process availability. This is enabled by supplying world class ENARDO products which have proven to be the most reliable in the process control industry.

ENARDO Flame and Detonation Arrestors >>

ENARDO offers a wide variety of arrestor products with maximum flow to pressure drop characteristics. Our portfolio includes in-line, free vent, high-pressure deflagration and detonation flame arrestors. ENARDO’s flame arrestors use spiral wound, crimped-metal ribbon flame cell elements to inhibit flame propagation by absorbing and dissipating heat, and are designed to provide maximum flow with a minimum amount of pressure drop across the element. Connection sizes range from ¾ inch up to 36 inches.

ENARDO Pressure Vacuum Relief Valves >>

ENARDO offers a comprehensive range of pressure vacuum relief valves that are recognized as the industry standard in safety and protection. ENARDO’s pipe-away, vent-to-atmosphere, in-line and end-of-line relief valves are installed on storage tanks to control evaporation and fugitive emission losses that result from flammable and hazardous petroleum vapor-producing products.

ENARDO Lock-down / Gauge Hatches >>

ENARDO Gauge Hatches are used the world over to control evaporation losses and protect tanks against excessive pressure or vacuum. Our line of gauge hatches includes:

• Dead Weight Models, which are generally used in very low pressure applications with 1, 2, 3, or 4 ounce pressure settings and a 4/10 ounce vacuum relief

• Spring-Loaded Models, which are utilized in low pressure applications with 2, 4, 6, 8, 12, 16, 24, and 32 ounce pressure settings and 4/10 ounce, 1 ounce, and 3.5 ounce vacuum settings

• Lock-Down Hatches, which provide secure access but do not provide pressure or vacuum relieving capability.

ENARDO Emergency Pressure Relief Vents >>

ENARDO’s Emergency Relief Vent with Vacuum provides an emergency pressure relief opening for storage tanks when exposed to overpressures not handled by standard tank vents. When properly sized, this vent provides the capacity meet API Standard 2000 NFPA 30 and OSHA (29 CFR 1910.106) for emergency venting due to fire exposure, and offers high-capacity vacuum flow for emergency pump-out of product. It also provides quick, easy access for tank inspection and maintenance.

ENARDO Free Vents >>

ENARDO’s Free Vents are designed for use on bulk liquid storage tanks that contain non-volatile liquids. These vents offer efficient flow capacity to protect the tank from positive or negative overpressure, and allow vapors to flow freely in and out of the storage tank. It offers protection against rain, dirt, insects and other foreign matter entering the vent.


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