Not every flaring requirement at an oil and gas site calls for a permanent installation. Production testing, completion operations, temporary flowback facilities, pipeline outages, and emergency situations all create scenarios where operators need compliant combustion capacity quickly, without the capital commitment or construction lead time of a permanent flare stack. Rental flare and portable flare options address this gap by delivering temporary combustion solutions that satisfy EPA regulatory requirements, protect site personnel, and prevent uncontrolled vapor releases, all on a deployment timeline measured in days rather than months.
The market for temporary combustion equipment has expanded significantly as OOOOb compliance requirements brought more upstream storage tank operations under federal emission control mandates. Operators who previously relied on informal or uncontrolled venting during temporary operations now need compliant temporary solutions. This article explains how rental flare and portable flare systems work, what regulatory requirements they must satisfy, when they are the right choice over permanent installations, and how to evaluate suppliers for temporary combustion services.
What Makes a Flare System Portable and How Rental Equipment Works
Portable combustion equipment for oil and gas applications is engineered for rapid deployment, mobility between sites, and operational flexibility across varying gas volumes and compositions. Understanding the design features that make a flare portable explains both its capabilities and its limitations compared to permanent installations.
Portable enclosed combustors, also called vapor combustor units or VCUs, are the most common temporary emission control device for storage tank applications. They are skid-mounted packages that include a combustion chamber with a pilot ignition system, a flame arrestor on the vapor inlet, pressure control instrumentation, and a stack or exhaust system. The entire unit typically mounts on a trailer or skid that can be transported by a standard flatbed truck and positioned at the tank battery within a few hours of delivery.
A rental flare for temporary upstream production applications operates on the same principle as a permanent enclosed ground flare, but with simplified mounting, utility connections, and commissioning requirements that allow faster deployment. A permanent ground flare may require civil foundation work, permanent gas piping, and electrical utilities. A rental version uses skid mounting, flexible hose vapor connections, and self-contained or portable pilot gas supply.
Open flare boom systems provide a different temporary combustion approach for high-flow events such as well completion flowback, pipeline pigging, and pressure relief scenarios. These systems use a telescoping or fixed boom structure to elevate the combustion point, providing safe combustion of high-rate gas streams that would overwhelm enclosed combustor capacity. Open flares are less efficient at low flow rates and generate visible flame, making them less suitable for routine storage tank vapor control but appropriate for high-rate temporary events.
Rental equipment is typically delivered with all required documentation: equipment specifications, burner capacity ratings, pilot ignition specifications, and where available, previous performance test data or manufacturer emissions certifications that support regulatory compliance documentation.
Regulatory Requirements for Temporary Combustion Devices Under OOOOb
Temporary combustion equipment must meet the same performance requirements as permanent equipment under EPA 40 CFR 60 Subpart OOOOb when used as the primary emission control device at a storage tank affected facility. The regulations do not create a separate, more lenient standard for portable equipment. An operator who uses a rental enclosed combustor as the control device for OOOOb compliance must demonstrate that the device achieves 95% destruction efficiency of the vapor stream under actual site operating conditions.
For enclosed combustors operating at temperatures of 1,400 degrees Fahrenheit or higher with at least 0.5 seconds of gas residence time in the combustion zone, EPA has established that 95% destruction efficiency is presumed to be achieved. Rental equipment suppliers who provide temperature monitoring data confirming combustion zone conditions give operators the documentation basis for compliance certification.
The closed-vent system requirements that apply to permanent control device installations also apply to temporary installations. The vapor header connecting storage tanks to the rental flare must be maintained leak-free, and the vapor pathway must prevent atmospheric venting except through the combustion device. Flexible hose connections used in temporary installations must be rated for the operating pressure range of the vapor system and inspected for leaks at commissioning and periodically during the rental period.
Operators using temporary combustion devices for OOOOb compliance must also maintain records documenting the period of use, the vapor control device specifications, and any monitoring data collected during the temporary deployment. This documentation establishes the compliance record for the temporary operational period and protects the operator in the event of a regulatory inspection.
Applications Where Portable Flares Are the Right Solution
Understanding the specific operational scenarios where portable flaring outperforms both permanent flaring and vapor recovery helps operators make better temporary equipment decisions.
Well completion and flowback is the highest-volume application for portable combustion equipment. When a new well is first brought into production, the initial flowback period produces a combination of completion fluids, formation water, and high-rate gas that must be managed safely and in compliance with applicable regulations. Flowback gas rates are often too high for a permanent enclosed combustor sized for routine tank battery vapor control, requiring temporary open flare boom capacity or supplemental combustion equipment sized for peak flowback conditions.
Scheduled maintenance on permanent vapor control equipment creates another critical need for temporary combustion backup. When a permanent VRU or enclosed combustor requires maintenance that will take the primary control device offline for more than a few hours, the operator needs backup combustion capacity to maintain OOOOb compliance during the maintenance window. A portable combustor bridging the gap prevents uncontrolled venting events that would create both compliance gaps and product loss.
Emergency equipment failures are a less planned but equally important application. When a primary vapor control device fails unexpectedly, operators need emergency portable combustion capacity deployed within hours, not days, to prevent extended uncontrolled venting. Rental equipment suppliers who maintain local equipment inventory and rapid deployment capabilities are critical infrastructure for operators managing active production sites.
Production testing and appraisal operations that precede permanent facility construction frequently require temporary emission control. Operators testing new well performance before committing to permanent surface infrastructure need compliant temporary combustion solutions that can be deployed quickly and removed when the test period ends. Portable flares sized for expected production rates provide compliant temporary control at appropriate capital efficiency for appraisal-phase operations.
Evaluating Portable Flare Suppliers for Temporary Combustion Services
The quality of temporary combustion equipment and the service capability of the supplier are both critical factors in a rental engagement. Several evaluation criteria separate qualified temporary combustion suppliers from vendors offering inadequately specified equipment.
Equipment specification and compliance documentation is the first evaluation criterion. A qualified supplier should be able to provide written equipment specifications covering combustion chamber design temperature, design residence time, rated vapor throughput capacity, pilot ignition system specifications, and applicable performance data. Equipment that cannot be documented to meet OOOOb combustion efficiency thresholds cannot be used as a compliant control device.
Deployment speed and geographic coverage are practical capability factors that determine whether a supplier can actually serve your operation. Operators experiencing a primary equipment failure need replacement combustion capacity in hours, not days. Suppliers who maintain regional equipment inventory, have established transport logistics, and can demonstrate historical rapid deployment capability are meaningfully different from suppliers who must source equipment remotely and ship from out-of-region warehouses.
The technical support capability during the rental period matters as much as the equipment itself. Portable combustion devices operating in challenging oilfield environments experience ignition failures, pilot gas supply issues, and control system problems. A supplier who provides 24-hour technical support and can dispatch service technicians to troubleshoot in the field is a fundamentally different service offering from one who delivers equipment and leaves the operator to manage problems independently.
Combustion equipment suppliers who also engineer and manufacture permanent Portable Flares have a technical advantage over rental-only operations. Manufacturers who rent their own equipment have direct access to engineering support, spare parts, and replacement equipment from their production inventory. Rental-only operators who subrent third-party equipment typically cannot provide the same level of technical support depth.
Sizing Portable Combustion Equipment for Temporary Applications
Improperly sized temporary combustion equipment is one of the most common causes of compliance failures during temporary operations. Operators often underestimate peak vapor generation during completion flowback, overlook thermal breathing cycles during summer temperature swings, or fail to account for the combined vapor load from multiple tanks at a battery when sizing a single temporary control device.
Accurate sizing for a temporary combustion device starts with the same vapor generation calculation used for permanent equipment: flash gas rate from process engineering calculations or field measurement, thermal breathing contribution from tank surface area and diurnal temperature range, working loss from tank throughput and API gravity, and any additional vapor sources such as tanker truck loading operations.
The sizing margin for temporary equipment should be more conservative than for permanent equipment, because rental units cannot be quickly upsized if the initial size proves inadequate during operations. A temporary combustor sized at 125% to 150% of calculated average vapor rate provides reasonable surge capacity for peak events that exceed the design basis. The incremental rental cost of a larger unit is typically modest relative to the regulatory risk of undersized temporary equipment that allows P/V relief valve openings during peak vapor conditions.
Conclusion
Rental flare and portable flare solutions are an essential operational tool for oil and gas producers managing temporary production scenarios, equipment maintenance windows, emergency control device failures, and appraisal operations. The temporary nature of the need does not reduce the regulatory requirement: EPA OOOOb's 95% emission control standard applies whether the control device is permanent or portable, owned or rented. Operators who engage qualified temporary combustion service providers with documented equipment specifications, rapid deployment capability, and field technical support can maintain continuous compliance through operational transitions that permanent equipment cannot cost-effectively address.
The most effective approach to temporary combustion planning is proactive rather than reactive. Operators who identify in advance which operational scenarios create temporary vapor control gaps, contract with qualified portable flare suppliers before those scenarios arise, and pre-specify equipment that meets OOOOb compliance requirements are in a fundamentally stronger compliance position than operators who scramble to find temporary equipment after a primary system failure. Contact a qualified combustion equipment specialist to evaluate your temporary flaring needs and identify portable solutions matched to your specific operational and regulatory requirements.
Frequently Asked Questions
What is a rental flare and when is it used in oil and gas operations?
A rental flare is a portable combustion device, typically a skid-mounted enclosed combustor or open flare boom, that an operator rents from a service company for temporary vapor control at oil and gas production facilities. Common applications include well completion and flowback operations, primary equipment maintenance windows, emergency backup during equipment failures, and production testing operations that precede permanent facility construction.
Do portable flares meet EPA OOOOb compliance requirements?
Yes, when properly specified and operated. EPA OOOOb does not distinguish between permanent and portable control devices in terms of performance requirements. A portable enclosed combustor operating at 1,400 degrees Fahrenheit combustion temperature with 0.5-second gas residence time satisfies OOOOb's 95% destruction efficiency presumption for enclosed combustors. Operators must also maintain the closed-vent system connecting tanks to the portable combustor in a leak-free condition and document the temporary compliance period.
How quickly can a portable flare be deployed at a production site?
Deployment speed depends on the supplier's regional equipment inventory and transport logistics. Qualified temporary combustion suppliers with regional inventory can typically mobilize and commission a portable enclosed combustor or rental flare boom within 24 to 48 hours of a service request. Emergency situations may be served faster by suppliers who maintain rapid-response equipment ready for immediate dispatch.
What size portable flare do I need for a storage tank battery?
Sizing depends on the combined vapor generation rate of all tanks at the battery, including flash gas from separator throughput, thermal breathing losses, and working losses from liquid level changes. A portable combustor should be sized to handle peak vapor generation, not just average conditions, with a design margin of 25% to 50% above calculated peak rate to provide capacity for unexpected vapor surges during completion operations or hot weather thermal breathing events.
What should I look for when selecting a rental flare supplier?
Key evaluation criteria include: documented equipment specifications showing the combustion device meets OOOOb performance thresholds, regional inventory and rapid deployment capability, 24-hour field technical support for ignition and control system troubleshooting, experience with upstream oil and gas vapor control applications, and supplier ability to provide compliance documentation supporting the operator's OOOOb compliance records for the temporary control period.
