The inlet pressure drop rule is designed to protect pressure relief valves (PRVs) from instability; however, recent changes to API 520 allow the pressure drop to go above 3% of the set pressure if a supplementary engineering analysis is completed. This article, published in the September 2021 issue of World Fertilizer, discusses the improvements to the API codes and standards and how those changes impact the 3% rule.
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A local PWHT procedure that fully complies with WRC 452 does not guarantee the residual stress relief assumed in fitness-for-service assessments, and for equipment susceptible to environmental cracking, that gap can be the difference between a successful repair and a repeat failure. This case study presents a coupled welding and PWHT finite element simulation of a fractionator head repair, comparing local PWHT outcomes against furnace treatment and identifying ramp rate as the most powerful lever for improving stress relief.
The current ASME PCC-2 Article 212 guidance for fillet-welded patch repairs is known to be conservative, frequently driving patch plate thicknesses past the 1.5-inch threshold that triggers mandatory PWHT. This article presents Equity Engineering’s proposed T-min methodology, an FEA-validated alternative that eliminates unnecessary thickness penalties and reduces PWHT risk while remaining technically rigorous and grounded in ASME design-by-analysis principles.
Not every inspection finding requires physical repair, and not every repair that looks straightforward actually is. This article in our Engineering 101 series outlines the full pressure equipment repair process, from characterizing damage and identifying the governing codes to selecting the right method and closing out the work with proper documentation.
Combustible dust explosions are well-documented, well-studied, and entirely preventable, and yet they continue to claim lives, as tragically demonstrated by the July 2025 explosion at a Nebraska biofuels facility. This article introduces the engineering fundamentals of explosion venting, walking through the key parameters, calculations, and judgment calls required to design a compliant and effective deflagration vent per NFPA 68.
Equity is committed to safety and reliability. Our specialized consulting services, technology, training, and corporate standards are dedicated to your safety and success. Using our technology-forward mindset, we solve complex industrial asset integrity issues and improve plant performance. Our practical and actionable solutions help you manage risk, control costs, and maximize equipment lifecycle.
Equity’s Quality Management System is certified to the ISO 9001:2015 quality standard by Amtivo.
Equity solves industrial asset reliability problems. We deliver purpose-fit solutions that prioritize safety, reliability, and performance. Together we offer specialized consulting services, training, software, and corporate standards for the energy sector and other industrial processing industries.
We are Technology Forward.
20600 Chagrin Blvd., Suite 1200
Shaker Heights, OH, 44122, United States
P: +1.216.283.9519
F: +1.216.283.6022
E: CustomerService@e2g.com
Equity uses a multi-disciplinary approach to help improve facility-wide safety, increase inspection efficiencies, reduce equipment downtime, and maximize operational reliability. Our specialized engineering consulting services and technologies support the oil and gas, petrochemical, chemical, fertilizer, and other related processing industries.
Equity’s engineering and consulting services are focused on managing the entire asset lifecycle to provide you with practical recommendations to improve safety, increase equipment reliability, and mitigate risk.
Equity’s cloud-native software keeps you and your asset management projects moving forward. Our software is designed to simplify your day-to-day tasks while helping you develop expert-level analysis skills.
Equity offers training courses and webinars to support your professional growth wherever you are in your career. As active participants on API and ASME committees, our team uses this knowledge to develop high-quality and industry-relevant training courses and webinars.
Equity is headquartered in Shaker Heights, OH, with offices in Katy, TX, Houston, TX, Abu Dhabi, UAE, and Hyderabad, India. Our specialized consulting services, technology, training, and corporate standards prioritize safety and reliability for industrial processing facilities.
20600 Chagrin Blvd., Suite 1200
Shaker Heights, OH, 44122, United States
P: +1.216.283.9519
F: +1.216.283.6022
E: CustomerService@e2g.com
