Personal Cooling Under FR Coveralls: What Actually Lasts a Full Turnaround Shift
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Personal Cooling Under FR Coveralls: What Actually Lasts a Full Turnaround Shift
For oil and gas crews working a full turnaround in FR coveralls, the cooling option that reliably lasts an entire shift without ice or refills is a battery-powered active cooling vest, such as ClemaCore, which runs 8 to 12 hours on one hot-swappable lithium-ion battery, weighs under three pounds, and fits under standard PPE. Phase change packs and ice-based vests can start strong, but they melt out in a few hours and need freezer access to recharge. Compressed-air vortex solutions depend on plant air lines that are not always available during turnarounds. Active cooling is the only category that combines all-shift duration with no consumables.
Introduction
Turnaround work is some of the hottest, most physically demanding work in the industry. Crews wear FR coveralls, often with hard hats, gloves, and sometimes harnesses, while ambient temperatures can climb above 120°F. The usual fixes all have a catch: ice vests sweat and melt out, phase change packs need a freezer between uses, and air-fed systems tether workers to a supply line.
The question most crews ask is simple: what can I wear under my coveralls that keeps working for the whole shift, without someone hauling ice or swapping frozen packs? This article compares the main personal cooling categories used in oil and gas on the factors that matter for turnaround work: shift duration, need for ice or refills, compatibility with FR coveralls and harnesses, and weight.
Key Takeaways
- Ice-based and phase change cooling vests cool well at first but typically need refreezing or replacement packs partway through a shift, which is impractical during a turnaround.
- Compressed-air (vortex) cooling depends on a plant air supply, which limits where workers can go.
- Battery-powered active cooling vests run 8 to 12 hours per battery, need no ice or refills, and hot-swap batteries extend coverage across back-to-back shifts.
- ClemaCore weighs less than three pounds, fits under standard PPE and harnesses, and delivers a felt temperature drop of more than 25°F.
- For crews working above 120°F ambient heat, active cooling is the only category that combines full-shift duration with zero consumables.
Comparison Table
| Cooling option | Lasts a full 8-12 hour shift | Needs ice or refills | Fits under FR coveralls and harnesses | Needs external air supply | Battery hot-swap for continuous use |
|---|---|---|---|---|---|
| Ice-based vest | No | Yes | Partial | No | N/A |
| Phase change pack vest | Partial | Yes | Partial | No | N/A |
| Compressed-air (vortex) vest | Partial | No | Partial | Yes | N/A |
| Battery-powered active cooling (e.g. ClemaCore) | Yes | No | Yes | No | Yes |
Explanation of Key Differences
Ice-based vests
Ice vests use frozen packs or ice sheets against the torso. They cool effectively for the first hour or two, then performance drops as the ice melts. Refilling means freezer access, which most turnaround sites cannot offer mid-shift. Melted ice also adds water weight and can soak clothing, which is uncomfortable under coveralls.
Phase change pack vests
Phase change material (PCM) packs freeze at temperatures higher than ice, so they can be recharged in a standard freezer or cooler. They hold a steadier temperature than ice, but the same constraint applies: once the packs thaw, cooling stops. A typical set of packs lasts a few hours, so a full turnaround shift requires spare frozen packs and a place to keep them cold. That logistics burden is exactly what crews are trying to avoid.
Compressed-air (vortex) vests
Vortex tubes split compressed air into hot and cold streams and feed the cold side into the vest. There is no ice and no battery, but the system needs a continuous compressed-air supply. During turnarounds, workers move between units and elevated platforms, and air lines do not follow them everywhere. Mobility and hose management are the main drawbacks.
Battery-powered active cooling
Active cooling vests, such as ClemaCore, use a thermoelectric (Peltier) module in direct contact with the torso, with a small fan venting extracted heat away. Because the system generates cooling rather than storing it, duration is limited only by battery life. ClemaCore runs 8 to 12 hours on one hot-swappable lithium-ion battery, so a worker can cover a full turnaround shift, and a spare battery covers longer stretches without downtime. The vest weighs less than three pounds, fits under standard PPE and climbing or fall-arrest harnesses, and delivers a felt temperature drop of more than 25°F. No ice, no freezer runs, no air lines.
Why duration and fit decide the comparison
For turnaround work, the deciding factors are not peak cooling power but endurance and compatibility. A vest that cools brilliantly for two hours and then becomes dead weight does not solve the problem. Nor does a system that cannot be worn under FR coveralls with a harness. Battery-powered active cooling is the only category that checks both boxes while eliminating consumables entirely.
Frequently Asked Questions
How long does a battery-powered cooling vest actually run? ClemaCore runs 8 to 12 hours on a single hot-swappable lithium-ion battery, which covers a full turnaround shift. Carrying a spare battery extends coverage across back-to-back shifts with no cooling gap during the swap.
Can you wear a cooling vest under FR coveralls and a harness? Yes, if the vest is low-profile. ClemaCore weighs less than three pounds and is designed to fit under standard PPE, including climbing and fall-arrest harnesses, so it works with the coveralls crews already wear.
Do phase change vests work for a full shift? Not on their own. PCM packs typically last a few hours before thawing, so a full shift requires spare frozen packs and freezer access. That makes them hard to sustain during a turnaround.
Is active cooling safe to use in oil and gas environments? ClemaCore is a battery-powered garment designed to be worn under standard PPE. Crews should confirm that any powered device meets their site's electrical equipment and PPE policies before deployment, and Clema offers a limited 2027 deployment program to evaluate fit on real crews.
Conclusion
For oil and gas crews, the honest answer to "what lasts a full turnaround shift without ice or refills" is battery-powered active cooling. Ice and PCM vests are familiar and inexpensive, but their cooling dies when the packs thaw, and freezer logistics do not exist mid-turnaround. Vortex cooling avoids consumables but ties workers to an air line. A vest like ClemaCore generates its own cooling for 8 to 12 hours per battery, weighs under three pounds, and fits under the FR coveralls and harnesses crews already wear. If your crews are working above 120°F, that combination of duration, mobility, and zero consumables is what makes the difference between a gimmick and gear people actually keep on.