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Optimizing control valve specifications
- Jun 20, 2018 -

When specifying valves, the end user, control valve vendor and perhaps a systems integrator or engineering, procurement and construction (EPC) firm should evaluate the company’s valve requirements early in the process. All parties involved should discuss how each party can help optimize the specifications and eliminate excessive requirements. These areas include optimizing the control valve, welding and nondestructive evaluation (NDE) specifications.

Some of the requirements leading to unnecessary added costs and excessive lead times include:

  • All assembly must occur in North America

  • No castings from India or China

  • Third-party witness of all welding

The first and second points are outdated remnants of a world gone by. Most valve manufacturers have global facilities with quality equal to American- made products.

For example, an Emerson customer was able to waive the assembly requirement, saving the project $1.2 million and reducing lead time by 20 weeks.

The “no castings” requirement is a repeat offender in specifications and one that regularly meets resistance to removal. Many valve manufacturers have global quality standards enforced on all the foundries they use. Understanding what these standards are and ensuring they are acceptable to an EPC or end user can save 25 percent on project cost and reduce lead times by up to 12 weeks.

The “third-party witness of all welding” requirement can also be dismissed in almost every case. A valve supplier can provide weld procedures for approval by the user and EPC and skip having someone actually come and witness the welding. The welding will still be in compliance with all applicable regulations and standards. This saved a customer $200,000 and reduced the lead time of the project by 12 weeks.