Project Tag: Gulf Coast

Crystal Beach Mystery Pipeline Response

Global provided personnel,equipment and resources necessary to locate the source of a stain and sheen discovered offshore of the Bolivar Peninsula. A mystery pipeline was located offshore and thought to be the source of the pollutants. Specialized equipment was brought in to locate the pipeline where came ashore. Once exposed,it was the shore end was hot tapped and connected to a vac truck to remove the pollutants in the pipeline. It was determined by the USCG that the pipeline and its contents were not a significant environmental threat at which time the pipeline was plugged,sealed and reburied.

Water Treatment Plant – Intake Installation

The City of Austin,Texas installed a new water treatment system to supply water to the growing city and surrounding area. Global Diving supported the installation of piling,lake tap structure,and piping / screen segments.

USCG – Orphan Well Leaker

Mobilized surface dive spread and light construction vessel(s) to conduct site clearance operations on a leaking well at Main Pass 25. Conducted diver and sonar (Mesotech 1000) survey of bottom within 100′ radius of well center. Identified and removed (3) 2″ pipelines and misc. debris from bottom in preparation of lift boat arriving on site to perform well abandonment operations.

Platform Decommissioning

Working aboard the D/B Superior Performance,we provided mixed gas diving support to WWCI for the removal of an 8-pile platform jacket. Diving operations were conducted to a depth of 218 fsw. Due to internal obstructions,divers utilized diamond wire saw tooling to cut two of the jacket legs. The remaining legs were cut utilizing underwater burning rod.

South Timbalier 196 B – Platform Removal

We provided surface diving support aboard the D/B Superior Performance to assist,as needed,with the removal of the topside package and platform jacket. Dive work was performed down to 105 fsw using standard surface diving procedures.

The platform was initially cut free from the jacket then the legs were cut 15 feet below mud line using explosives. After all the legs had been severed,the platform toppled onto its side so that the D/B Superior Performance could pick up the structure,approximately 710 metric tons,and set it on the materials barge for transport to shore and proper disposal.

Pompano – Subsea SCR tie-back

Global Diving & Salvage,Inc,working off the OCV Rem Clough provided Saturation Divers to assist with the installation of 26 ton SCR hang-off deck at -330′,installation of 15 riser clamp assemblies and riser tie-in spools from +20′ to -330′ with metrology done for final tie-in spool and all platform leg preparation to facilitate said installations.

NuStar Energy SPM Hose Replacement

Working off the DSV DPII Ocean Carrier,we provided saturation diving services as required to disconnect the existing dual 24″ hose section from the PLEM (Pipe Line End Manifold) on bottom. Once the exisitng hose has been removed from the SPM (Single Point Moor) buoy and attach the new hoses,the hoses were reconnected to the same structure.

Mariner Oil Platform Removal

Global provided saturation diving services aboard the DSV Ocean Carrier to assist with the completion of removal of Platform B,a hurricane damaged,8 leg fixed platform in block EI 292. The upper package had been previously removed as well as the wells plugged and abandoned. Currently,portions of the lower jacket including the lower half of four legs and the majority of the interconnecting members at one end of the jacket remain. The highest point is of the debris is at 170 fsw with two of the legs bent over and protruding into the ocean floor,elevation 220 fsw. Portions of the structure that interfered with the P&A operation were placed in piles on bottom. GDS has been contracted to remove all the remaining structure as well as remaining debris on bottom.

SMI Paraffin Blockage Clean Out

Global Diving & Salvage,Inc is providing saturation diving from the DSV Ocean Carrier to assist with the location of and removal of a paraffin blockage in an oil flow line. The location of the blockage will be identified by use of a strain gauge which will very accurately measure the expansion of the existing pipeline when it is put under pressure. Measurements will be taken along the pipeline alignment (20,000 feet). Once the plug is located the pipe will be hot tapped and the blockage flushed out. Depth of the work will range from 320 to 400 feet.

Platform Removal

Saturation divers working at a depth of 200 fsw remove the upper deck and conductors of downed platform. The remaining platform pieces will be removed at a later date.