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Save Time and Money with Centrifugally Cast Tubing

Save time and money with centrifugally cast tubing


Four questions to address when designing tubing for oil & gas applications

By Alan Holtz, Vice President of Sales and Marketing

Centrifugally cast tubing can provide cost savings and shorter lead times when compared with wrought tubing in many onshore and offshore oil and gas applications. But when is it a viable option? That depends on four key considerations that need to be discussed with a centrifugal casting supplier with proven metallurgy expertise:

  1. What’s the application? The decision is influenced by the operating environment and intended use. The designer needs to properly understand the environment where the tubing is used so that the centrifugal casting supplier can guide the alloy selection process. As an example, a tubular component that is part of a sub-sea blowout preventer has very different performance requirements and safety demands than a component on a centrifuge found onshore. Talking it through with a knowledgeable supplier will dictate whether centrifugally cast tubing is an appropriate choice.
  2. What are desired alloys properties? Although there is a wide variety of alloys to choose from for centrifugally cast tubing that will meet the budget and deliver the required performance, the decision as to which one is most suitable is not cut-and-dried. The decision is predicated on tradeoffs in terms of different types of alloys and their properties, including corrosion resistance, wear resistance and strength. Knowing what properties are most desired will give an experienced metallurgist the information needed to narrow the possibilities and recommend the alloy that will meet the design criteria.
  3. What is the tubing wall thickness? Once desired alloy properties have been determined, the designer needs to establish the appropriate wall thickness based upon the strength requirements, including safety factors. With these determinations, the designer and supplier can candidly discuss whether a centrifugal casting is viable. ASME quality factors of 85%, 90% and 100% can also be part of the design criteria.
  4. What is the quantity? A key factor is the quantity of tubing needed. Although it’s a basic question, it’s an important one since the answer might be another element of the decision-making process. Centrifugally cast tubing can be cost-effectively produced in short runs when compared to mill-run extruded tubing.

Factor in consistency and integrity

The challenge in design engineering is to select a solution that best uses the available resources and also meets the project’s requirements. A centrifugally cast component can be an excellent alternative to a wrought part.

Look to a knowledgeable supplier/metallurgist who can guide the process and help you design a product that best meets the application. Equally important is the need to work with a supplier who offers consistency and integrity related to product quality, lead times, and service.

About the author

Alan Holtz has been in charge of Sales and Marketing at Spuncast for over 13 years. He holds a BS degree in Metallurgical Engineering from the University of Missouri – Rolla (now Missouri University of Science & Technology) and a BA degree in History from the University of Pennsylvania. He has spent over 36 years in the metal casting industry.

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