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The NAO trailer flares were first developed in the early 1980's for Chevron production in Colorado as skid mounted units to be moved by skid trucks, but this concept was found to be too slow and limiting in capacity and size of the flares.

Mark I

NAO developed and built the Mark I trailer flare in 1985.  The trailer flare included dual ASME code drums (150 PSIG) for liquid removal and flashback protection.  The risers for the flare where make as lightweight trusses to give it extra strength for operation in winds of over 100 MPH.  The members of the truss were pipe so they could also provide functional uses, such as, assist gas for complete combustion, compressed air or steam for smokeless burning of heavy hydrocarbons, or to act as small side/secondary flares.  A gasoline powered engine provided power for a hydraulic system.  The hydraulic system operated leveling jacks for the trailer and stabilizing outriggers.  Dual hydraulic winches and dual cable systems (primary and redundant for safety)  were provided to raise and lower the flare stack.

Mark I trailer flare with dual drums (liquid disentrainment and flashback water seal), hydraulic system for level jacks and winches for raising stack -- Wide range of burners can be fitted for gases and waste vapors

The Mark I trailer flare has a 8" riser by 80' tall.  Flare burners up to 16" can be handled for the full height and larger burners, such as, shrouded low Btu or special process units can be handled with 40' stack due to the burners increased windloading.

Mark II

NAO developed the Mark II trailer flare to handle large flaring rates and large burners.  The Mark II trailer has many of the same features as the Mark I -- only larger and more heavy duty.  For example, the pipe members for the truss were enlarged for added strength and also to provide more capacity of assist gas for complete combustion, compressed air or steam for smokeless burning of heavy hydrocarbons, or to act as small side/secondary flares.


Mark II Trailer Flare at NAO Texas -- 80' Tall by 8" Riser -- Can fit with flares up to 16" diameter and special burners for low Btu gases and process streams

Mark II trailer flare at NAO Texas

Riser --  8" -  80' Overall

Note: Risers on trailer bed for transport.

Secondary Risers --  3  -  3"

Drums -- Disentrainment + Water Seal




EXAMPLE -- Multi Trailer Flare Job

Three (3) trailer flares at Amoco, Texas City for flare maintenance

Three (3) -- Mark II trailer flares at Amoco, Texas City for flare maintenance -- Used three (3) trailers to handle the flare flow and also due to limited space for larger single temporary flare.

The three (3) trailer flares were located along the edge of the plant on the side of a fire access road without blocking the road.

The trailer flares were staged by means of their water seal drums so that the number of flares in service increased with increased flow rates.

NAO provided full controls for the flare pilots and also automatic smokeless control by means of optical flame monitors and steam control valves.




Mark III

NAO's third generation trailer flare is actually two trailers.  One trailer for the flare stack and one trailer for the flare drums/lifting.  The Mark III has a 16" diameter stack and has a maximum height of 150'.  The trailers are designed to be the maximum allowable size for road transport without a permit in the USA.

For large flow rates, NAO can provide temporary flares up to 36" riser by 300' tall.  See temporary flares in the Pipeline Service Section.


NAO offers leases, rental and sales.  NAO also offers engineering/key component packages for local manufacturer in foreign or overseas jobs, thus saving transport and duty.

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For more information and assistance, contact

Johnny Straitz   --   Ext. 213
Telephone ---  215-743-5300
Toll Free ----   800-523-3495    All USA and Canada
Fax ------------  215-743-3018    or    215-743-3020
E-mail --------


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