High-pressure, steam-side service — typically governed by ASME Section I for power boilers rather than Section VIII, and typically paired with U-Tube construction for the highest pressure and thermal cycling.
| Application Scope | Power boiler steam-side pressure boundary duty |
| Governing Code | ASME Section I (power boilers) — distinct from Section VIII |
| Common Structural Pairing | U-Tube, for highest pressure and thermal cycling resistance |
| Common Materials | Alloy Steel, Stainless Steel 321/347 for elevated temperature |
Boiler service drives specific code and material choices distinct from general process heat exchange.
Section I specifically governs power boilers and their appurtenances, with rules tailored to boiler-specific service conditions, while Section VIII governs pressure vessels more broadly. A boiler tube sheet is typically built to Section I rather than Section VIII.
Boiler service combines the highest pressure with significant thermal cycling during startup and shutdown — U-Tube design handles both without an expansion joint or floating head, reducing mechanical complexity at the highest-stress operating conditions.
Alloy steel is common for general boiler service; stabilized stainless grades like 321 or 347 are used where elevated temperature combined with welded construction requires sensitization resistance.
Every enquiry is checked against governing code, material compatibility and manufacturing feasibility before a quote is issued. Use our product, material, grade and standards guides to freeze the RFQ — then confirm with engineering.
Send your diameter, material, pressure class and quantity — we'll confirm thickness and price.