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llustrates a lower-capital-cost option for both you and the distributor. It is achieved by coupling multiple DOT liquid cylinders to a supply manifold and augmenting each vessel's pressure-building circuit. This is achieved by regulating pressure from another cylinder to a vent manifold that couples each supply cylinder's vent-use valve. This setup ensures that each cylinder delivers in unison up to four times the flow rate that could be achieved individually. This also facilitates equal withdrawal, thereby reducing residual return losses.
A 500-PSI-rated cylinder typically costs $2,700. A 200-liter vessel has a nominal storage capacity of just 3,300 cu. ft. of nitrogen. The distributor would be required to purchase eight cylinders with an asset cost of $21,600 to support a monthly consumption of 30,000 to 40,000 cu. ft. of gas. This translates into a monthly rental cost of about $270 for your shop.
If usage patterns dictate a continuous supply, then the distributor could couple the cryogenic supply to an automatic switchover. This would add about $60 to $75 to your monthly facility fee over a three-year period. In addition to increased cylinder handling, the liquid cylinders would cost your shop about 3 to 4 percent in residual return losses. This can be offset partially by switchover technology with intelligent controls that economize or divert excess cylinder head pressure to the use line.
Ultimately, a nitrogen assist gas growth strategy must reconcile peak performance with equitable asset management so as not to burden your shop with Polyurethane injection grouting facility fees. An effective solution is to ease into nitrogen use with cradles, liquid cylinders, microbulk, and bulk when the appropriate benefits match your monthly usage patterns.