Comparative assessment of the inline and branching design strategies based on the compound technique

Abstract

The inline or branching water hammer control strategies, which are based on the insertion of compound plastic short-penstock or -inline section at the transient-induced region of main pipes, illustrated a promising ability to upgrade steel pipe-based hydraulic systems concerning the extension of admissible pressure level. In this respect, prior results suggested that the specific layout utilizing an (HDPE–LDPE) compound short-penstock (where the (HDPE) sub-short-penstock is attached to the main steel pipe and the (LDPE) sub-short-penstock corresponds to the short-penstock dead-end side) provided significant attenuation of pressure magnitude. Concurrently, recent studies concluded that the (HDPE–LDPE) compound short-section-based inline strategy provided substantial attenuation of pressure magnitude. However, these strategies illustrated a drawback relying on the expansion of the period of pressure wave oscillations. Accordingly, this study assessed and compared the capacities of the compound technique concerning the trade-off between the magnitude-attenuation and the period-expansion of pressure wave oscillations. The findings of these analyses evidenced that (HDPE–LDPE) compound short-penstock particular setup of the branching strategy allowed the best trade-off between the attenuation of magnitude and the period expansion of pressure wave oscillations. Furthermore, results showed the competitiveness of the latter upgrading strategy as compared to the (HDPE) or (LDPE) main pipe-based renewed hydraulic systems.

Water Hammer Control Using Additional Branched HDPE Pipe

“…The experimental and numerical study performed by Pezzinga and Scandura [24] and Pezzinga [25] revealed that the ability of the additional polymeric pipe to dampen pressure waves depends mainly on the ratio between the volume of the device and that of the network system. The performance of redesigning existing steel pipelines to control severe pressure waves was investigated by Triki [26][27][28][29] who revealed that this technique may significantly enhance the reliability of hydraulic systems.…”

Fluid transients in viscoelastic pipes via an internal variable constitutive theory

“…Typical industrial pipe systems are made with steels of different carbon contents, which exhibit linear elastic behavior in the scope of applications. On the other hand, sanitary sewer and water supply pipes are usually made of polymeric materials like polyvinyl chloride (PVC), polybutylene (PB), low-density polyethylene (LDPE), and highdensity polyethylene (HDPE), which respond to hydraulic loading with a viscoelastic mechanical response [1][2][3] . In the last decades, the application of these materials in a diverse range of industrial applications has increased due to their attractive mechanical and chemical properties aside from their lower costs [4] .…”