A flare stack is not a one-size-fits-all safety device. The right configuration must safely handle the gas the site can send to it, remain stable in expected weather, fit the operating plan, and be practical to inspect and maintain. The first major decision is often whether the site needs a portable flare that can move with the work or a stationary flare designed around a permanent facility.

This guide explains the tradeoffs. It is a starting point for project planning, not a substitute for a site-specific engineering review, hazard analysis, permit review, or the manufacturer’s operating limits.

Portable and Stationary Flare Stacks at a Glance

A portable flare stack is mounted or packaged so it can be transported and set up at different locations. It is commonly considered for temporary production, well testing, maintenance, commissioning, upset support, or facilities whose operating plan changes frequently.

A stationary flare stack is installed as part of a permanent facility. Its piping, supports, controls, utilities, clearances, and maintenance access can be engineered around a known site layout and a defined long-term relief or disposal duty.

Neither category is automatically safer or more efficient. The better choice is the one that matches the full operating envelope and can be installed, operated, and maintained correctly.

1. Start with Flow Range, Not Average Flow

Average flow is rarely enough to select a flare. The design team needs to understand the minimum, normal, and maximum rates, how quickly flow can change, how long peak events may last, and whether multiple sources can discharge at the same time. A flare that performs well at one steady rate may have poor flame stability at low flow or exceed acceptable backpressure at an upset rate.

• For portable units: confirm that one transportable package can cover the expected range at each destination. Repeatedly using adapters or improvised restrictions to make one unit fit many duties can introduce operating risk.
• For stationary units: evaluate present production and credible future cases. A permanent installation should not become undersized after a facility expansion or behave poorly as production declines.

Provide the flare supplier with actual or defensible design cases rather than a single rounded flow estimate. Include gas rate, duration, source, temperature, composition, and whether liquids may be present.

2. Check Pressure and Allowable Backpressure

Available pressure determines whether gas can move through the collection piping and flare tip under the worst expected conditions. The total pressure loss includes headers, valves, fittings, elevation, any flame arresting or control equipment, and the tip itself. Excessive backpressure can affect connected vessels, relief devices, and normal operation.

Portable layouts often use temporary hose or piping runs that change from job to job, so pressure-drop assumptions must be reviewed for every setup. A stationary system allows the complete header to be engineered once, but future tie-ins still need evaluation. Low-pressure tank vapor service requires especially careful attention; equipment intended for higher-pressure gas should not be assumed to work at very low inlet pressure.

3. Define What “Smokeless” Must Mean for the Site

Visible smoke is influenced by gas composition, heating value, mixing, tip design, flow rate, available assist medium, and wind. A system described as smokeless still has an operating envelope. Heavy hydrocarbons, liquids, or a rate outside that envelope can create smoke or unstable combustion.

Ask how the selected design promotes air and gas mixing, whether it requires air or steam assist, what utilities that assist system needs, and how performance changes at minimum and maximum rates. Also identify who will monitor the flare and what action operators should take if smoke, flame instability, or loss of ignition occurs. The equipment selection must align with the facility’s applicable permit and operating requirements.

4. Decide How Much Mobility Is Actually Valuable

Mobility can reduce capital tied up at temporary sites and shorten response time, but transportability does not eliminate setup work. Every move requires a suitable location, secure anchoring or support, correct clearances, compatible connections, leak testing, ignition checks, grounding where required, and a documented pre-start inspection.

A portable flare is usually the stronger candidate when the duty is temporary, the unit will serve several sites, the process source is predictable, and crews can perform a controlled setup each time. A stationary flare is usually stronger when the duty is continuous, the flare is part of a permanent relief or control strategy, site-specific foundations and piping are justified, or frequent moves would create more work than they save.

5. Design for Wind and Site Conditions

West Texas and Southeast New Mexico sites can experience strong wind, dust, heat, freezing conditions, and rapid weather changes. Wind affects flame direction, ignition reliability, dispersion, radiation, and the placement of nearby equipment or work areas. It also adds structural load to the stack and any elevated components.

Selection should consider the site’s design wind basis, stack height, support method, manufacturer limits, surrounding terrain, nearby tanks and equipment, overhead lines, traffic routes, and prevailing winds. Portable systems need a level setup area with enough room for transport and safe positioning. Stationary systems need a foundation and support design appropriate to the permanent location.

6. Compare Installation Requirements

Portable flare installation considerations

• Transport dimensions, weight, towing or lifting plan, and road access
• Setup surface, leveling, anchoring, grounding, and exclusion area
• Temporary piping or hose rating, routing, supports, and connection compatibility
• Fuel, instrument air, electrical, solar, or battery needs for ignition and controls
• Commissioning checklist after every relocation

Stationary flare installation considerations

• Foundation, structural supports, permanent access, and lifting provisions
• Header sizing, knockout or liquid-handling provisions, and isolation philosophy
• Permanent utilities, control integration, alarms, and shutdown interfaces
• Radiation, dispersion, noise, and facility-layout review
• Inspection access without exposing personnel to unnecessary hazards

7. Specify Safety Controls and Liquid Protection

The flare system should have an ignition and flame-monitoring strategy appropriate to the service. Depending on the application, that may include pilots, automatic ignition, flame detection, local and remote status indication, alarms, shutdown logic, and procedures for a failed-light condition. Controls should be understandable to the people who operate and troubleshoot them.

Liquid carryover deserves separate attention. Slugs or condensate can damage equipment, create burning liquid, cause smoke, or extinguish a flame. Review whether the system needs upstream separation, a knockout vessel, drains, heat tracing, or operating procedures that keep liquids out of the flare header. Never treat the flare tip as a liquid-management device.

8. Plan Maintenance Before Choosing the Package

Portable equipment experiences transport vibration, repeated assembly, and changing environments. Its inspection program should include connections, supports, wiring, ignition components, tires or running gear where applicable, and damage after each move. Stationary equipment avoids transport wear but may require elevated access, scheduled tip inspection, corrosion monitoring, and maintenance of permanent utilities.

For either type, ask how crews will inspect the tip, verify ignition, clean fouled components, replace wear items, obtain spares, and document service. A lower purchase price can be erased by difficult access or repeated downtime.

Portable vs. Stationary Flare Selection Checklist

• What are the minimum, normal, maximum, and simultaneous flow cases?
• What inlet pressure is available, and what backpressure can the connected process tolerate?
• What is the gas composition and heating value? Can liquids or solids reach the system?
• Is the duty temporary, intermittent, emergency, or continuous?
• How often will the equipment move, and who owns the setup checklist?
• What wind, temperature, dust, corrosion, and structural conditions apply?
• What smokeless-performance range is required, and are assist utilities available?
• What ignition, flame detection, alarm, and shutdown functions are required?
• Are clearances, radiation, dispersion, noise, access, and permitting requirements defined?
• How will the unit be isolated, inspected, maintained, and supplied with spare parts?

Choose the System Around the Duty

A portable flare is often the practical answer for changing or temporary work. A stationary flare is often the better long-term answer for a defined permanent facility. The final decision should follow the engineering data, not the label on the equipment.

Redhead Services supplies portable and stationary flare stack solutions with configurable controls and field support for operators across our West Texas and Southeast New Mexico service area. To review a specific duty, gather the flow, pressure, composition, site layout, and operating cases above, then contact our team for an application review.