Sandia Energy > Programs > Sustainable Transportation > Hydrogen and Fuel Cells > Hydrogen Safety, Codes, and Standards > HELPR Hydrogen Extremely Low Probability of Rupture (HELPR) is a modular, probabilistic fracture mechanics platform developed to assess the structural integrity of natural gas infrastructure for transmission and distribution of hydrogen natural gas blends. HELPR contains fatigue and fracture engineering models to allow fast computations while its probabilistic framework enables users to explore and characterize the sensitivity of predicted outcomes to uncertainties within the pipeline’s structure and operation. HELPR development was supported by the Office of Energy Efficiency and Renewable Energy’s (EERE) Hydrogen and Fuel Cell Technologies Office (HFTO) within the U.S. Department of Energy (DOE). The HELPR software is available under the open-source 3-Clause BSD License. Access the source code for HELPR via GitHub Download the most recent build of the Windows installer Download the most recent build of the macOS installer Overview Features HELPR includes the following features: Applicable to pressurized cylindrical shells Fast running, deterministic engineering models Fatigue life estimation ASME CC2938 design curves with additional pressure compensation term Track crack growth over time, assuming cyclic pressure loading Stress intensity factor calculations for both finite length elliptical and long, internal flaws based on analytic solutions Failure assessment diagrams Probabilistic framework to provide predictions with uncertainty estimates Support for both characterized variability and unknown uncertainties Sensitivity studies to understand impact of input parameters on predicted quantities of interest Example Usage Given a user-defined system, HELPR can be used to: Estimate remaining fatigue life for a set of operating conditions Explore the impact of transporting different volume fractions of hydrogen on a pipeline’s temporal structural integrity Determine which operational parameter variabilities have the most significant impact on a pipeline’s structural integrity Documentation Documentation Suggested citation for HELPR v1.0.0: Benjamin B. Schroeder, Cianan Sim, Benjamin R. Liu, and Bailey Lucero. HELPR (Hydrogen Extremely Low Probability of Rupture), Version 1.0.0. Sandia National Laboratories (November 8, 2024); software available at: https://helpr.sandia.gov. B. Schroeder, R. Dingreville, C. San Marchi, and J. Ronevich: “Probabilistic Fracture Mechanics Toolkit for Hydrogen Blends in Natural Gas Infrastructure”. International Hydrogen Conference, Park City, UT, 17-20 September 2023, SAND2023-08941C. B. Schroeder, C. San Marchi, R. Dingreville, J. Ronevich: “Probabilistic Fracture Mechanics Toolkit for Hydrogen Blends in Natural Gas Infrastructure”, Emerging Fuels Symposium, 5-8 June 2023, Orlando FL, SAND2023-3992C Contact Benjamin Schroeder HELPR Team Lead email@example.com Chris San Marchi Hydrogen Materials Expert firstname.lastname@example.org Joe Ronevich Hydrogen Materials Expert email@example.com Sample Outputs See examples of data below that were produced using HELPR. A comparison of crack growth rates exercised during a fatigue calculation with ASME CC2938 design curves. An ensemble of crack growth temporal evolutions and the associated critical crack sizes at which crack growth is no longer stable. An ensemble of critical crack sizes (normalized by pipe wall thickness) and the associated number of crack growth cycles to reach the critical crack size A cumulative distribution function (CDF) of the number of cycles to reach the critical crack size. An ensemble of Failure Assessment Diagram (FAD) results. Cumulative distribution functions (CDFs) of the number of cycles to reach the critical crack size where each CDF corresponds to a sample of the epistemic input uncertainties. © 2023 National Technology & Engineering Solutions of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with NTESS, the U.S. Government retains rights in this software.