Boiler Thickness Calculation | Furnace Tube, Fire Tubes & Tubesheet | ASME Section Inspector's Guide

A fire-tube boiler is not just a pressure vessel — it's a combination of components under different pressures and temperatures, each calculated with its own specific formula. In this video, we break down the wall thickness calculation for every pressure component of a fire-tube boiler: the drum shell, furnace tube (under external pressure / buckling), fire tubes (under internal pressure), and tubesheets (ligament efficiency), according to ASME Section I (PG-27) and EN 12953. Whether you're a boiler inspector, a mechanical integrity engineer, or a professional reviewing a boiler design dossier, this video gives you the technical foundation to understand and verify boiler calculations with full confidence. ✅ What you'll learn in this video: ASME Section I PG-27 formula for tubes and drums: t = PD / (2SE + 2yP) + C The thermal coefficient "y" from ASME PG-27.4.6 — and why it matters at high temperature Furnace tube under external pressure: buckling risk and Adamson stiffening rings Fire tube thickness: PG-27 formula with mill tolerance and minimum structural allowance C Tubesheet ligament efficiency: longitudinal vs diagonal pitch — which one governs? Inspector's checklist for reviewing a fire-tube boiler design dossier 📌 Codes & Standards covered: 🔹 ASME Section I — Power Boilers (PG-27, PG-52) 🔹 EN 12953 — Shell Boilers 🔹 EN 12952 — Water-Tube Boilers (reference) 🔹 ASME Section II-D — Allowable Stresses 🔔 Subscribe to peqAcademy for weekly videos on pressure equipment design, inspection, and international codes — boilers, vessels, heat exchangers, columns, and more. 📧 Contact & Training inquiries: [email protected] 🌐 Website: www.peqacademy.com 🔗 Related videos on peqAcademy: ▶ Economizer & Superheater Tube Calculation — ASME Section I ▶ Cylindrical Shell Thickness — ASME UG-27 / EN 13445 ▶ External Pressure & Buckling — ASME UG-28 ▶ Heat Exchanger Thickness — Tubes, Shell & Tubesheet ⚠️ Disclaimer: This video is for educational purposes. Always refer to the latest edition of the applicable code for engineering design and inspection work.