Sand level in the process fluid is 250 PPM. Fluid is sour Oil and Gas mixture.1)Does the ball and seat require Tungsten Carbide coating?2)What are the criteria to select Tungsten Carbide coating?3)Are there any less expensive alternatives for TC?4) Suppose one compares x750 or 718 material versus TC coated 316L in the above application, which is better? A ball valve is not for throttling, therefore it should be 100% open and not really subject to sand wear on the ball exterior or seats. Sand should be flowing through without impinging on the ball surface as it would in an open condition. I sometimes consider hard facing valve plugs and seats with Stellite Alloy 6 or a suitable N08367 alloy in high wear applications. Stellite 6 is a cobalt based alloy that resists wire drawing when operating near the seat; and provides some resistance to errosion caused by entrained sand in oilfield production. Stellite performs well in many harsh chemical and severe temperature applications. I don't know how it compares to tungsten carbide coating.

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