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LPG Storage Sphere components: Shell Plate and Stub Leg Fabrication


With our unique equipment and capabilities, it was natural for a customer to come to us when they were in need of large storage spheres. In order to expand this part of our business, we modified our pressing system to accommodate cold and hot forming of spherical segments. To complete this project, we fabricated shell plate segments for 32 spheres that had diameters measuring between 63' and 73'. Relying on the customer-supplied designs, these spheres had a maximum thickness of 1.5" and met ASME Sec VIII Div 1 and Div 2 standards. We also developed a robot trimming system to complete all the trimming work needed on these spheres. In addition to being a cost effective method of trimming, this robot system was also used in cutting the sphere stub legs to the required shapes. With the robot system, our lead time on sphere storage fabrication is one of the fastest in the industry.

These pictures show equator plate segments, and trimming of stub leg on our robot trimming system. The stub leg is trimmed to fit the sphere curvature; after trimming and bevelling, the stub leg is fitted and welded to the equator. The cylindrical stub leg shown welded in place includes the terminations for cross bracing.  The 70" diameter sphere is used for butane storage in California, and thus legs and braces are required to meet California Seismic conditions.Conrex ability to supply formed sphere components for erection by others allows Oil and Gas Field Erection Contractors who lack the forming capabilities to participate in sphere projects.

Contact Conrex Steel to learn more about our fabrication services and this storage sphere project.

 

Cutting of sphere stub leg by programmable gantry robot system Cutting of sphere stub leg by programmable gantry robot system2 Upper Stub


Stub leg plate, and segments shipped on rail Storage Sphere Field Construction Storage Sphere Field Construction

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Fabrication of Storage Spheres Project Highlights

Product DescriptionStorage Sphere Components
Capabilities Applied/ProcessesHot & Cold Forming
  • Form Spherical Segments
Trimming
  • Developed Robot Trimming System
  • Integrating equipment and custom technology
  • Programmable trimming and beveling
  • Compressed processing time
  • Created a Very Cost Effective Trimming Method
Components Fabricated
Segments
Stub Legs
Lower Legs
Braces
Nozzles
Overall Part Dimensions Material Thickness: 1.5" Max.
Diameter: 38' to 73'
Material UsedSA 516 Gr70
Material FinishBlast and paint exterior surface to customer's specification
In process testing/inspection performedDimensional Inspection
Trial fit typical segments
Industry for UseLPG
Volume1 Sphere Per Month
Delivery/Turnaround Time 1 sphere per month
Delivery LocationTupman. California. USA.
Standards MetCustomer supplied print, 2D CAD Drawing
Customer Supplied Specifications
ASME Sec VIII Div 1 and Div 2
Project NameStorage Spheres

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