Streamlining operations with Chart's Siphon series cryogenic storage tanks

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Central Welding Distribution, located in Marysville, WA, is a major distributor of welding supplies and industrial gases. Gases are delivered to customers in high-pressure cylinders, liquid cylinders, dewars, and MicroBulk form. Central Welding runs six days per week and delivers to customers throughout northwestern Washington.


Central Welding was utilizing standard customer station bulk tanks to store bulk liquid nitrogen, oxygen and argon used in its filling operation. Because of design deficiencies, the 3,000 gallon standard bulk storage system required refilling at a 30% level in order to maintain enough head pressure. This limited production capacity and caused more deliveries per week with high costs for transportation ($75 per delivery), in addition to management’s time. Furthermore, excessive deliveries increase product losses.


Central Welding asked Chart Inc. to evaluate its situation and determine if a solution could be devised on its argon tank. Chart proposed a 6,000 gallon Siphon 100® Bulk Storage Tank, designed for filling operations. Central Welding also installed new pumps, manifolds and piping.


Siphon 100 tanks are designed for filling operations with 95% of product capacity available, not 70%, which drastically reduced deliveries and costs. Central Welding was able to reduce the number of deliveries and improve its production efficiency.

ROI Results:

The following analysis is based on hard cost savings – other production and management efficiencies were difficult to measure. Cost of deliveries were held steady at $75.

Central Welding Siphon Tank Case Study:

Cost of Delivery


Argon Deliveries per Week


Before Siphon 100 Tank


After Siphon 100 Tank


Cost Comparison


Cost Before Siphon 100 Tank


Cost After Siphon 100 Tank


Cost Savings per Week


Cost Savings per Year


Rent from Redeployed Tanks per Year


Total Savings and Income per Year


Total Savings and Income 5 Years


Note: A 3,000 gallon standard customer station was replaced with a 6,000 gallon Siphon 100 tank.


In addition to the financial benefits the Chart Siphon 100 tank brings to Central Welding noted above, several operational benefits also became apparent. Because the deliveries are now full truck loads, fewer deliveries are required. Fewer deliveries decreases product fill losses, and reduces management’s time spent on tracking, paperwork and invoice processing. The success of the argon evaluation prompted Central Welding to replace their nitrogen and oxygen customer stations with Siphon 100 fill plant tanks.

Customer Quote:

Dale Wilton, President, noted, “When we began our filling operations upgrade project, we knew we wanted a total solution: quality and consistent products, service, and on-going support. Chart delivered on all three. We have seen our bottom line increase year-over-year since the installation of these tanks and a ramp-up of our new fill facility. Our average gross profit per cylinder is up incrementally as well. It can’t be magic – the tanks have had a real effect. We are very satisfied.”

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