Project Tag: Burning/Welding Equipment

Anode Installation for Juneau, Alaska Cruise Ship Terminals

As the cruise service between the Pacific Northwest and Alaska increases so does the need for additional berthing and dock space. To accommodate this growth,Manson Construction was awarded the contract to fabricate and install two new cruise ship terminals in Juneau,Alaska.

The terminals are comprised of 2,331 new steel pilings,after being driven into place each requiring a sacrificial anode welded to the piling. Global was subcontracted to perform this challenging and critical aspect of the project. The anodes,ranging in weight from 216 to 260 pounds,had to be installed in accordance with AWS D3.6 welding standards at various depths,up to 105 feet below the water line.

Global personnel worked hand in hand with Manson’s project staff to minimize the impact on the project schedule. The crew successfully installed all anodes on a complex array of piles,in adverse conditions,without injury while maintaining the tight schedule set by the client.

Rock Island Dam Adult Fishway Extension

Rock Island Dam is located on the Columbia River,approximately 15 miles south of Wenatchee,WA. The development of a crack in a spillway of Wanapum Dam,downstream of Rock Island Dam necessitated a 25 foot drawdown of the tailrace. This created a significant obstacle for the fish migrating upstream; they would not have access to the original fish ladder. With the arrival of the migrating salmon just a few months away,this project took on a critical path very quickly.

Chelan County PUD,owners of Rock Island Dam,contracted Knight Construction from Spokane to install the emergency fish ladder extensions in three areas,two on the west bank and one on the east. Knight,who handled the fabrication and topside support,turned to Global Diving & Salvage,Inc. to provide the diving support for the project. With the compressed schedule required to complete the project,Global and Knight worked closely on scheduling the arrival of the fabricated items and their installation.

The extensions,similar to the structural components of the original fish ladder structure,consisted of steel boxes and flumes used to create pools and steps. These new boxes and flumes were mounted to the face of the dam and in the case of the east side,were suspended from a pipe that spanned two pier noses. The project involved a wide array of construction techniques,including; core drilling,setting of epoxy and mechanical anchors to secure the boxes and frame work in place,wall sawing to remove sections of the dam to allow access at the lower water levels. The steel sections were bolted and in some cases welded in place.

By all accounts the project has been a great success. According to the Wenatchee World,over 20,000 of the expected record 235,000 Chinook salmon migration have already traveled upstream past Rock Island Dam.

Saving the Reefs – Palmyra Atoll Wreck Removal

In the summer of 1991,a 121 foot long Taiwanese long line fishing vessel,the HUI FENG #1,ran aground on an atoll in the middle of the Pacific. With a footprint of just 4.6 square miles Palmyra Atoll forms the most northern vegetated island in the Northern Line Islands,lying some 1,000 miles south of Honolulu. The atoll has a long storied past and is now a national monument and wildlife refuge,cooperatively managed by the US Fish & Wildlife Service (USFWS) and The Nature Conservancy.

Palmyra Atoll encompasses some of the last remaining near- pristine reef environment on earth,boasting an intact marine predator-dominated marine ecosystem where species’ richness and diversity abound,with over 176 species of hard coral and 418 species of reef fish. Through monitoring of the reefs,a slow and insidious destruction was identified by the HUI FENG #1 and the other wrecks deteriorating on Palmyra and Kingman Reef,a non-vegetated wildlife refuge reef located 35 miles to the northwest of Palmyra.

At Palmyra the problem lay in a native marine organism called corallimorph that was effectively smothering the corals surrounding the wreck. Researchers have made observations over several years that showed the spread of the organism progressively increasing due to the leaching of iron into the environment as the wreck corroded serving as a fertilizer of sorts. At Kingman the problem was not corallimorph,but an invasive form of algae feeding off nutrients released from the dissolving wreckage of a burned fishing vessel.

In September of 2012,the US Fish & Wildlife Service’s issued an RFP for the removal of the two wrecks from Palmyra Atoll and Kingman Reef. Global Diving & Salvage,Inc. reached out to Curtin Maritime,frequent partners in unique and challenging projects,to collaborate on this. Several factors were fundamental in the planning process: the safety of personnel and equipment,followed closely by mitigating the potential of further damage to the extremely delicate living coral and reef structure. Working together a creative plan was developed to remove the wreckage from the inner-tidal areas. Flat deck scows were designed and built with shallow draft to transit the debris across the coral reef areas to the main barge that provided logistical support and housing for the project.

In total,the combined crew of 12 worked 79 days with 880 hours spent underwater to cut,rig and remove over 970,000 pounds of steel and debris,as well as 605 gallons of hydrocarbons. Susan White,the USFWS’s project leader for the removal effort,said the debris was “the equivalent of 67 large elephants or 31 city buses and was removed to protect some of the world’s most pristine coral reefs.”

Horse Mesa Dam, Units 1 – 4 Intake Repairs

Global Diving & Salvage,Inc was contracted by Salt River Project (SRP),operator of Horse Mesa Dam,located 65 miles northeast of Phoenix,AZ,to provide project management and diving services to make repairs of Units 1 through 4. The work on Unit 4,located in 160 feet of water,and on Units 1,2,and 3,located in 260 feet,necessitated the use of saturation divers.

Saturation diving is a method where divers live at a pressure equal to the depth they are working and transit to and from the work area via a diving bell. When not working,they live in chambers that are located on the deck of the barge. A crew of 21 working in two 12-hour shifts are required to support both the divers on deck and those in the water. In saturation diving,decompression is not eliminated; it is delayed until their rotation is over,which is usually 30 days. On this project,it took three days to decompress from the working depth to the surface.

In June 2012,a vertical concrete guide vane located in Unit 4 failed. Divers removed the remaining sections of the damaged vane as well as a second still-intact vane,using wire saws and wall saws. A new steel vane system,consisting of two vertical and nine horizontal vanes,was installed in place of the original concrete structures. The vanes were bolted in place and then filled with grout for added stability. New trashracks were installed in the intake. The bulkheads for Units 1,2,and 3 did not seal adequately to the penstock intakes due to deteriorated concrete on the intake opening face. Divers anchored and sealed new steel sealing frames at each intake location. Inspection also discovered deteriorated concrete at various locations in the three sets of gate guide slots on the upstream face,which was repaired.

Northern California Dive Bundle

Provided project management and supervision for three simultaneous projects,each with unique scopes,bundled into one contract. Project demonstrated Global’s ability to manage a complex project by assembling a command structure to oversee and facilitate the individual projects,at three remote job sites located approximately 70 miles from each other.

The command structure included; a Project Superintendent,acting as the single point of contact with the owner and providing continuity between the three job sites,a resident engineer to maintain the submittal roster as well as address unforeseen issues as they arose,and an administrative coordinator to monitor the submittal and paper flow that ensues with a project of this magnitude.

Over 700 dives were performed between the three job sites in water ranging from 25 to 205 feet at altitudes of up to 3,800 feet above sea level. Approximately 3,000 cubic yards of river debris was removed,50 cubic yards of concrete and grout were placed,and 150,000 pounds of steel were added.

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.

Inland Drilling Shaft Extraction

The contractor was digging multiple vertical shafts to a depth of 250′ in a vacant city lot in downtown San Francisco. These shafts are to form a ‘bulkhead’ to prevent soil movement,while excavation for a subway station and California’s future ‘high speed rail line’ is completed on the work site. The casings are filled with water during the excavation to resist surrounding ground pressure. During the extraction of a casing,the sections separated at three locations,120,145,and 170 feet.

Divers were lowered down the 84 inch diameter excavated casing in a man basket to a water depth of 170 feet. Repair options included welding the casing sections together or drilling through the section overlap and installing steel ‘plugs’ to lock the sections together.

The repair was successful and the casing was removed.

Pile Cutoff at Hunters Point

We were contracted to survey,locate,and burn off an assortment of 20 inch diameter steel pilings,during the demolition phase of a pier at an old US Navy Base at Hunters Point in the San Francsico Bay; a ‘superfund’ site clean up. A four-man crew was dispatched and spent 2 long days searching in zero visibilty conditions,marking targets with buoys,and eventually cutting off and retrieving the piles,which ranged from 10′ to 38′ feet long.

Olive Ranch Valve Replacement

We were hired to perform a 12″ valve replacement located in a briney pond at an olive ranch. The first task was to remove a trash screen so that one of our divers could entered a vault,burn off 12 bolts,and replace an existing 12″ slide gate valves with a blind flange until the new valve could arrive.

Upon delivery the two new valves,the dive crew will return,take off the blind flange and replace it with a new valve. In addition,a second old valve will be removed and replaced.

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.