Experimental and numerical investigation of axial single scroll integral pumping devices for dual mechanical seals

Radial flow pumping rings receive the flow radially which is perpendicular on the shaft while axial flow pumping rings receive the flow in a direction parallel to the shaft (axially). An experimental investigation is carried out to evaluate the single axial pumping ring performance with a non API design radial clearance. The experimental setup is constructed according to API plan 53B with an accumulator-based seal support system in the barrier circuit loop. Furthermore, a numerical investigation is conducted to provide a reliable numerical model represented by ANSYS Fluent by creating an acceptable meshing and turbulence modeling using the experimental results as a validation method. As for the numerical investigation, it is indicated that K-epsilon realizable turbulence model is the best numerical model in terms of the least error deviation between the numerical model’s performance curve and the experimental performance curve. Keywords: Dual mechanical seal, Axial pumping ring, Numerical study, Experimental, Computational fluid dynamic

Acute psychosis and concurrent rhabdomyolysis unveiling diagnosis of hypothyroidism

Neuropsychiatric and muscular symptoms can develop as part of hypothyroidism. However, frank psychosis or rhabdomyolysis due to hypothyroidism are uncommon and have been reported rarely as the first presenting features of hypothyroidism. We report a case of a 44-year-old man who presented with a 2-week history of delusions, hallucinations and mild bilateral leg pain, without apparent signs of myxedema. Investigations revealed raised thyroid stimulation hormone >100 mIU/L and high creatine kinase >21 000 U/L. Diagnosis of hypothyroidism-induced psychosis and rhabdomyolysis was made. He received thyroxine, olanzapine and a short course of steroids. His symptoms improved after 2 weeks of treatment and he remained free of symptoms at 6 months of follow-up. To the best of our knowledge, this is the first case of concomitant psychosis and rhabdomyolysis leading to hypothyroidism diagnosis. This case highlights the importance of hypothyroidism screening when faced with unexplained psychosis or rhabdomyolysis, especially if combined. - BMJ Publishing Group Limited 2019.Scopu