PDF Publication Title:
Text from PDF Page: 019
In the case of river crossings when navigational traffic prohibits the float-and sink procedure, a “bottom-pull” procedure, illustrated in Figure 6, has been successfully used. When using this procedure, only sufficient ballast is added to the pipe to ensure that the pipe follows the river bottom as it is winched from one shore to the ded or the pipeline can be adequately backfilled to produce the required other. After the completion of the “bottom-pull,” additional ballast can be added or choring and to offset any lift that may be created by currents or river flow. the pipeline can be adequately backfilled to produce the required anchoring and to offset any lift that may be created by currents or river flow. Chapter 10 377 Marine Installations 18 WEIGHTED PE PIPE PE PIPE SEGMENT WITH WIEGHTS Figure 6 “Bottom-Pull” Installation of PE Pipe S t e p 9 F i Sg u u b r m e e 9 r s . i 6 o n “ o Bf t o h e t t P o i p m e - l i P n e u U l l s ” i n I g n t s h t e a F l l l o a a t t i - o a n n d o - S f i n P k E M e P t h i p o d e To prepare the pipe for submersion, it is first accurately positioned over its intended location. The sinking operation basically consists of the controlled addition of Submersion of the pipeline using the float-and-sink method– To prepare the opposite end. The sinking is conducted so that it starts at the shore where the water from the on-shore end of the pipe and the release of the entrapped air from pipe for submersion it is first accurately positioned over its intended location. pipe enters the body of water and then gradually progresses into deeper waters. To e sinking operation basically consists of the controlled addition of water from achieve this, an air pocket is induced by lifting the floating pipe close to the shore. on-shore end of the pipe and the release of the entrapped air from the As the water is allowed to enter the pipe from the shore side, the added weight posite end. The sinking is conducted so that it starts at the shore where the causes this initial air pocket to move outward and the intermediate section of pipe e enters the body of water and then gradually progresses into deeper waters. between the air pocket and the shore end to sink. As additional water is added, this achieve this, an air pocket is induced by the lifting of the floating pipe close to pocket moves to deeper waters causing the sinking to progress to its terminal point shore. Aisn thebowday toef rwiastera. lTlhoiws ceodntrtollednrateterofthsuebmpeiprseionfromminimthizeessphipoerbeensdidineg the ded weight causes this initial air pocket to move outward and the intermediate and it allows the pipeline to adjust and conform to the bottom profile so that it is evenly supported along its entire length (See Figure 7). tion of pipe between the air pocket and the shore end to sink. As additional ter is added this pocket moves to deeper waters causing the sinking to gress to its terminal point in the body of water. This controlled rate of mersion minimizes pipe bending and it allows the pipeline to adjust and form to the bottom profile so that it is evenly supported along its entire length 9 e e p e c a o b n ee Figure 9.7).PDF Image | Marine Installations PE
PDF Search Title:
Marine Installations PEOriginal File Name Searched:
PE-Marine-Installations.pdfDIY PDF Search: Google It | Yahoo | Bing
Development of a solar powered Electric Ship The Electricship website originally started off as a project to develop a comprehensive renewable, affordable, modular electric ship... More Info
Modular Boat Hull Composite The case for a unsinkable, modular composite hybrid boat hull... More Info
MS Burgenstock Hybrid Electric Catamaran Lake Lucerne Unique shuttle servicing Lucerne to the Burgenstock Resort... More Info
Ground Power Unit GPU Powered by Lithium Ion Batteries The goal of the Ground Power Unit is to provide a readily accessible, modular, ready-to-power solution for remote power... More Info
| CONTACT TEL: 608-238-6001 Email: greg@electricship.com | RSS | AMP |