Pay careful attention to the contract language, as these contracts typically renew automatically and may require you to cancel well in advance if you intend to renegotiate. To get a permanent, on-site LOX tank, you’ll have to sign a contract with the gas company that will lock you into a price for at least a year. For the LOX itself, you’ll pay a price per 100 CF, as well as delivery and other fees. This setup requires a concrete platform that you must build. For this privilege, the gas company will charge you $20,000+ for the tank, evaporator and other equipment. If you use a large amount of oxygen, you may want to install a permanent, on-site LOX tank. You can extrapolate from the test to calculate your overall requirements. Find your actual flow rate by measuring usage in an isolated part of your system, e.g. For this reason, I recommend setting up a simple test in which you measure oxygen usage with a flow meter and, if needed, a temporary oxygen source, such as a compressed tank. It’s not easy to calculate your oxygen requirements accurately, as there are many variables to put into the equation. The short explanation is that the “S” in SCFM implies standard temperature and pressure, whereas CFM implies actual temperature and pressure. To understand the meaning of the word “standard” in these units of measurement, read this article. For flow, it’s typically SCFM (standard cubic feet per minute), SCFH (standard cubic feet per hour), or SLPM (standard liters per minute). If your concern is weight, gas is commonly measured in pounds or kilograms. For volume, the common unit in the US is standard cubic feet (SCF), whereas Europe and elsewhere use standard cubic meters (M 3). To quantify oxygen, you may use volume, weight, or flow rate. To make the most economical choice, let’s examine your requirements. The amount of oxygen you use will impact the cost of compressed, liquid, and generated oxygen. Gas company prices vary significantly depending on where you’re located, whether you’re getting scheduled deliveries, and whether you have an annual contract. This simple question has a not-so-simple answer, as there are many factors that influence the cost of oxygen.
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