Processing, August 2019
28 Processing AUGUST 2019 higher 25 psig increment Any visually detectable weeping or leaking through the pressure boundary walls that are part of the valve assembly is a mandatory cause for rejection Figure 3 Compliance with these specifications must be ensured as well as with other requirements regarding materials Meeting material requirements Valve casting integrity and quality begins with specifications that call not only for premium materials but also for the materials that work best in the intended applications These application requirements include strength and ductility as well as resistance to certain factors including the makeup of the controlled fluid operating temperature and flow velocity For instance chemical composition must be controlled precisely to achieve an alloys intended performance level Carbon steel castings for valves intended for use in oil and gas applications must meet NACE SP0472 recommendations that chemical composition be controlled to less than 043 carbon equivalency The lower carbon content improves weldability and reduces the potential for stress cracking by hydrogen sulfide typically found in oil and gas production and processing applications Another example of materials tied to a specific application include those for upstream oil and gas NEW MOBILE FILLER For 1 to 5 Gallon Containers This all stainless steel mobile filler is designed for food grade applications to fill small containers in a batch operation We also provide installation parts and field service 833 467 3432 specialtyequipment com info@ specialtyequipment com Valve casting integrity and quality begins with specifications that call not only for premium materials but also for the materials that work best in the intended applications Figure 3 Pressure retaining components of a valve are subjected to hydrostatic testing to evaluate the parts integrity Visible leakage or seepage through a casting means automatic rejection
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