PVF Blog
Technical guides on pipe fittings, flanges, ASME standards, and material selection for industrial piping professionals.
Pipe Fitting Weight for Material Take-off: Elbows, Tees, and Reducers
How to calculate pipe fitting weight for a complete MTO. Covers ASME B16.9 elbows, equal tees, and concentric reducers with reference weight tables, a step-by-step MTO workflow, and common mistakes to avoid.
How to Calculate Pipe Weight: Formula, Examples, and MTO Tips
Step-by-step guide to calculating pipe weight per meter and per length. Includes the ASME B36.10M formula, worked examples for common NPS sizes, material density table, and practical tips for material take-off and shipping.
Flange Bolt Torque Chart (PCC-1): Values, K Factor & Three-Pass Method
Flange bolt torque chart per ASME PCC-1: recommended torque values by flange size and class, how the K factor affects torque, and the three-pass bolting sequence.
Why Bolt Torque Calculators Disagree by 30% (and How to Check Them)
Two bolt torque calculators can give results 30% apart and both claim to follow ASME PCC-1. Here's what actually drives the difference — K factor, friction, and lubrication.
How to Calculate Valve Cv: Liquid, Gas & Steam Sizing Worked Examples
Step-by-step valve Cv calculation for liquids, gases, and steam, with worked examples. Learn the Cv formula, unit conversions, and how to pick the right valve size.
Valve Weight Chart by Class: Gate, Globe, Check & Ball (Class 150/300/600)
Valve weight chart by pressure class for gate, globe, check, and ball valves. Typical weights from NPS 2 to 12 in Class 150, 300, and 600 for freight estimating.
Gate vs Globe vs Ball vs Check Valve: How to Choose (2026 Selection Guide)
Gate, globe, ball, and check valves compared: working principle, pressure drop, sealing, cost, and typical applications. A practical selection guide for piping engineers.
ASME VIII UG-27 & UG-32 Thickness, Explained With a Full Worked Example
ASME VIII Div 1 UG-27 and UG-32 wall thickness formulas explained in plain language, with a complete worked example for a pressure vessel shell and 2:1 ellipsoidal head.
Mengcun vs Yanshan: Which Hebei Cluster Should You Source Pipe Fittings From?
Mengcun and Yanshan both ship ASME B16.9 fittings worldwide, but they specialize differently. Compare product range, pricing, MOQ, and export experience before you buy.
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.
We Checked 3 Popular Online Flange Weight Charts. 9 Values Were Wrong by 10x.
We audited 3 widely used online flange weight charts against ASME B16.5 geometric calculations. 9 of the published values were off by a factor of 10 or more.
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.
Pipe Fitting Weight Calculator Comparison: We Tested 5 Tools
We tested 5 popular pipe fitting weight calculators against ASME B16.9 reference values. Here's what we found — including 10x errors, missing inputs, and what an accurate calculator actually requires.
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.
Why Most Online Flange Weight Calculators Give Wrong Results
Most flange weight calculators online are wrong — sometimes by 10x or more. Here's why, and how ASME B16.5 geometric modeling fixes it.