Fatigue Assessment Case Studies
Fatigue Analysis For A Reactor Feed Pressurization Drum
A fatigue analysis has been done for a reactor feed pressurization drum. The vessel operates under cyclic pressure ranging from 25 psig to 200 psig (1.7 – 13.8 bar), with a design life of more than 5 million cycles. Additionally, it is subjected to 200 full-range cycles from atmospheric pressure up to a design pressure of 310 psig (21.4 bar). All operations are conducted at a constant temperature of 130 ⁰F (54.4 ⁰C). The fatigue analysis is performed in accordance with the ASME VIII division 2 part 5.5.3 design code.
Design Verification of a Thermal Energy Storage System (TESS)
A finite element method (FEM) analysis was conducted on a molten salt and oil heat exchanger utilized at a solar plant facility. This heat exchanger, which is part of a series of three identical units connected in sequence, operates under relatively high pressures and temperatures. It experiences cycling variations in pressure and temperature between day and night operations.
Assessment of Vibrating Process Line: Fatigue Analysis and Recommendations
DRG performed a comprehensive visual inspection to determine the resonance modes being excited by the vibrations. The client provided vibration measurements, which allowed DRG to analyze the amplitude and frequency of these vibrations.
Fatigue Analysis of Interconnecting Lines between Norit Vessels and Heat Exchangers
Since the early 1980s, cracks have been observed in the off-gas cleaning section of the ethylbenzene hydroperoxide (EBHP) reaction unit. To address environmental concerns, EBHP must be removed from the off-gas before flaring.
Floating Head Heat Exchanger Fatigue Analysis
In a new industrial process, an existing floating head heat exchanger is being repurposed. The operational conditions involve cyclic loading, which were not originally considered during its design phase. To evaluate the impact of these cyclic loads on the heat exchanger, Dynaflow Research Group conducted a comprehensive fatigue analysis.
Detailed Fatigue Analysis of an 8-Pass U-Tube Heat Exchanger in Refinery Operations
This case study examines the detailed fatigue stress analysis conducted on a heat exchanger used to heat Polyol before it entered a refinery reactor. The complex 8-pass, U-tube configuration with a flanged stationary tube sheet required thorough investigation to ensure operational integrity and longevity.
Fatigue Assessment of a Condenser: Finite Element Analysis of Transient and Steady State Conditions
A shell and tube heat exchanger is utilized to condense propylene gas. The temperature of the propylene gas entering the shell side cycles through a range of approximately 200ºC multiple times a day. This temperature cycling induces thermal (secondary) stresses within the condenser, which are exacerbated by the rapid increase in the temperature of the incoming gas.
