As a casing tube supplier, I’ve spent over a decade on job sites, in warehouses, and even in tricky roadside storage spots, watching one avoidable mistake ruin perfectly good tubes: bad storage. It’s easy to write off storage as just “putting stuff away,” but when you’re dealing with casing tubes—heavy, high-stakes pipes used for everything from oil well drilling to foundation piling—even a small storage misstep can lead to corrosion, structural weakening, or costly rejections that eat into both your budget and timeline. I’ve seen a brand-new batch of API 5CT casing tubes come in, sit exposed to dew and highway dust for two weeks, and get scratched so deep during loading that an entire run had to be scrapped. That’s the kind of headache I want to help you avoid, so let’s break down the actual, actionable storage conditions for casing tubes, based on what I’ve learned from 12 years in this business, plus the industry standards we follow every day. Casing Tube
First, let’s get one thing straight: casing tubes aren’t uniform. You can’t use the same storage rules for a 20-inch heavy-wall oil well casing as you would for a 6-inch thin-walled structural casing for a building foundation. But there are core conditions that apply to every type, starting with location. The best storage space is a dry, covered, enclosed warehouse—no exceptions when possible. Outdoor storage is sometimes unavoidable, especially for large projects that need immediate access, but it’s a high-risk secondary option, not a primary one. I learned this early on working on a pipeline project in West Texas: we had 500 16-inch casing tubes left outside for a month during monsoon season, and by the time we were ready to install, almost 10% had started to develop white rust, a sign that corrosion was already eating through the protective coating.
If you have to store casing outdoors, the first rule is elevation. Never set casing directly on the ground. Even if the ground looks hard and dry, morning dew will seep up from the soil, and condensation will pool at the bottom of each tube. We use heavy-duty wooden cribbing, treated to resist rot, that’s at least 6 inches high. For extra protection, we sometimes layer plastic sheeting under the cribbing to block moisture from the ground. The cribbing should be spaced every 8 to 10 feet along the length of the tube—too far apart, and the tube will sag, especially longer lengths (anything over 30 feet is prone to bending if not supported evenly). Sag isn’t just a cosmetic issue; it can throw off threading when you go to connect tubes, leading to leaks or failed pressure tests on the job.
Temperature control is another big one, especially for coated casing. Most casing tubes come with a protective coating—whether it’s fusion-bonded epoxy (FBE), polyethylene, or even just a mill primer—and extreme temperatures can damage that coating. FBE coating, for example, cures at around 400 degrees Fahrenheit, and if you store it in direct sunlight on a 100-degree day, the coating can start to soften, making it vulnerable to scratches during handling. We keep our coated casing stored in shaded areas, and we never stack them higher than 10 layers, because the weight of the top tubes can crush the coating on the bottom ones. Uncoated carbon steel casing is a bit more forgiving, but even it can develop surface rust faster in high-temperature, high-humidity environments, so keeping temperatures between 50 and 85 degrees Fahrenheit is ideal—easy to hit in a climate-controlled warehouse, and just a matter of using tarps or shade cloth for outdoor storage.
Next, moisture is the enemy number one for casing tubes, full stop. Even a tiny amount of moisture trapped inside a tube that’s been lying horizontally can cause internal corrosion, which is almost impossible to spot until you’ve already installed the tube. I once had a client call me panicking because an oil well casing he’d bought from another supplier had rust so badly on the inside that a pressure test failed 6 weeks after installation. The supplier had shipped it with the ends open, and rainwater had gotten in, sitting there until it ate through the wall. To prevent that, every single casing tube we ship or store has its ends capped. We use heavy-duty plastic end caps that snap on tight, so no water, dust, or debris can get inside. For long-term storage (more than 3 months), we also plug the ends with foam, which absorbs any residual moisture and keeps it from sloshing around inside the tube when the wind blows or tubes are moved. Humidity control matters too—inside our warehouse, we keep humidity levels below 60%. We use dehumidifiers in the summer months when humidity spikes, because even at 70% humidity, uncoated carbon steel will start to show surface rust in as little as 10 days.
Handling during storage is just as important as the storage conditions themselves. Casing tubes are heavy—an 18-inch diameter, 40-foot long carbon steel tube can weigh over 2,000 pounds, so you can’t drag them or drop them. Dropping even a small distance can cause dents, which are structural weak points that can lead to failure under pressure or during installation. We use cranes with nylon slings, not steel chains, because steel chains can scratch or gouge the tube surface. If you do scratch a coated tube, you have to repair that scratch immediately, because it’s a gateway for corrosion. We keep a tube of touch-up epoxy primer on hand for exactly that, because even a tiny scratch can turn into a full-blown rust spot if left untreated. Stacking is another key part of handling: you should only stack casing tubes of the same diameter and length together, because if you stack a 20-inch tube on top of a 10-inch one, the smaller one can shift and scratch the larger one’s coating. We also never exceed a stack height of 15 layers for uncoated tubes, and 10 for coated ones, to prevent the bottom tubes from being crushed.
Special considerations come into play for specialty casing, too. Stainless steel or alloy casing used for harsh environments (like deep-sea drilling or high-sulfur gas wells) has different storage needs. Stainless steel is prone to crevice corrosion if stored next to carbon steel, because the two different metals create a galvanic reaction when exposed to moisture. That means we never store stainless steel casing alongside regular carbon steel tubes, even if they’re coated. We also keep stainless steel in a separate area of the warehouse, and we wash it with a mild, pH-neutral detergent every 3 months to remove any salt or dust that might have settled on it—salt is especially bad for stainless steel, as it speeds up corrosion. For high-alloy casing used in sour service environments, we make sure to store them in a climate-controlled area, with zero exposure to chemicals or corrosive fumes, because even a tiny amount of hydrogen sulfide in the air can cause stress corrosion cracking, a type of damage that’s almost impossible to detect until it’s too late.
Long-term storage, which is anything over 6 months, requires extra steps. We have a section of our warehouse set aside for casing that’s stored for more than a year, and we rotate through it every 6 months—meaning we use the oldest stock first, to prevent it from sitting too long. For long-term outdoor storage, we wrap each tube in a breathable, UV-stabilized plastic film, not a regular plastic tarp, because regular plastic traps moisture against the tube, leading to condensation. The breathable film lets air circulate, so any small amount of moisture that gets trapped can evaporate. We also apply a thin layer of rust inhibitor to uncoated carbon steel casing that’s going into long-term storage—we use a water-based inhibitor that doesn’t leave a sticky residue, so it doesn’t interfere with welding or threading when it’s time to use the tube.
I can’t tell you how many times I’ve had a customer come to me with casing that’s been damaged during storage, and they thought it was a defect from the manufacturer. Most of the time, it’s not—poor storage is the culprit, and it’s completely avoidable. Let’s recap the core storage conditions to make this easy: choose a dry, covered location whenever possible; elevate tubes on treated wooden cribbing, spaced properly to prevent sagging; control temperature and humidity to avoid coating damage and corrosion; cap all ends to keep water and debris out; handle with care using nylon slings, not steel chains; store similar-sized tubes together and follow stack height limits; separate specialty metals (like stainless steel) from carbon steel; and for long-term storage, use breathable wrapping and rust inhibitors.
If you’re working on a project and need casing tubes, or you have existing casing that you need to store correctly, I’m here to help. As a supplier who’s been in this industry for years, I don’t just sell tubes—I help you make them last, so you don’t waste money on avoidable damage. Reach out to my team to discuss your storage needs, get a quote for casing that meets your project requirements, or ask any questions you have about proper storage practices. We’ve got the expertise to help you avoid the headaches that come with bad storage, so your project can stay on track and on budget.
Transition Joint References
- American Petroleum Institute. 2020. Specification for Casing and Tubing (API Spec 5CT), 8th ed.
- National Association of Corrosion Engineers (NACE). 2018. Storage, Handling, and Transportation of Corrosion-Prone Metal Products.
- ASTM International. 2021. Standard Practice for Storage of Steel Products (ASTM A955/A955M).
- Casing Tubulars Association. 2022. Best Practices for Field and Warehouse Storage of Drilling Casing.
Quzhou Shenjian Machinery Factory
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