PVF Blog
Technical guides on pipe fittings, flanges, ASME standards, and material selection for industrial piping professionals.
MSS SP-75 vs ASME B16.9: High-Yield Fitting Standards Compared
MSS SP-75 vs ASME B16.9: key differences in size range, material grades, pressure ratings, and applications. Learn when to specify WPHY fittings over standard B16.9.
Flange Facing Types: RF, FF, RTJ, M&F, T&G Selection Guide
Flange facing types explained: raised face (RF), flat face (FF), ring type joint (RTJ), male & female, tongue & groove. Learn which facing to use for your pressure class and gasket type.
Piping Class Chart: 150#–1500# Materials, Fittings, Gaskets
Piping class chart for Class 150, 300, 600, 900, 1500. Standard materials, fitting specs, gasket types, flange facings, and pipe schedules for each class.
Pipe Schedule Chart Explained: Complete Guide to SCH 10–XXS
Learn what pipe schedule numbers mean, how to read a pipe schedule chart, and the difference between SCH 10, 40, 80, 160, and XXS wall thicknesses.
ASME B16.5 vs B16.47: Flange Standard Comparison
Compare ASME B16.5 and B16.47 flange standards. Learn the differences in size range, pressure classes, applications, and how to choose the right standard for your project.
304 vs 316 Stainless Steel Flanges: Which One Do You Need?
Compare 304 and 316 stainless steel flanges for corrosion resistance, temperature limits, cost, and applications. Learn when to upgrade from 304 to 316 in coastal, chemical, and high-chloride environments.
How to Choose the Right Flange Class (150–2500)
Learn how to select the correct ASME flange pressure class for your application. Compare Class 150, 300, 600, 900, 1500, and 2500 ratings with temperature-pressure tables and selection guidelines.
ASTM A105 vs A234 WPB: Forged Flange vs Wrought Fitting
ASTM A105 and A234 WPB are the most common carbon steel materials in piping. Learn the differences in manufacturing process, mechanical properties, applications, and why they are not interchangeable.
Weld Neck vs Slip-On vs Socket Weld vs Threaded: Flange Type Selection Guide
Compare weld neck, slip-on, socket weld, threaded, and lap joint flanges. Learn which flange type to use for high pressure, high temperature, corrosive media, and cost-sensitive applications.
Pipe Fitting Weight Chart: NPS 1/2" to 24" (kg per piece)
Complete pipe fitting weight chart for elbows, tees, reducers, and caps. NPS 1/2" to 24", Sch 40 and Sch 80, carbon steel and stainless steel. Use for estimating, shipping, and procurement.