Fired Heater Learning Center

API 530 Tube Wall Thickness Calculator

API RP530 Tube Wall Calculator

This calculator uses curve fits of the stress values and formulas from the API RP 530 to calculate the minimum tube wall required.

Tube Outside Diameter, in: Design Wall Temperature, °F:
Elastic Design Pressure, psig: Rupture Design Pressure, psig:
Corrosion Allowance, in: Tube Material:

Elastic Stress At Temperature, psi: Rupture Stress At Temperature, psi:
Elastic Stress Thickness, in: Rupture Stress Thickness, in:
Minimum Elastic Thickness, in: Minimum Rupture Thickness, in:


The formulas and correlations presented herein are all in the public domain and are to be used only as a learning tool. Note that any product, process, or technology in this document may be the subject of other intellectual property rights reserved by sponsors or contributors to this site. This publication is provided as is, without any warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of fitness for a particular purpose, or non-infringement.

The formulas, correlations, and methods presented herein should not be considered as being recommended by or used by the sponsors of this site. The purpose of this site is educational and the methods may or may not be suitable for actual design of equipment. Only a fired heater design engineer is qualified to decide if a calculation or procedure is correct for an application.