TDW Helps Relieve Stress on Riser Offshore Malaysia

Posted by Eric Haun
Thursday, June 26, 2014
Photo courtesy of T.D. Williamson

Comprehensive pipeline services solution allows preventive measures to be carried out safely

T.D. Williamson (TDW) announced that it recently completed a comprehensive pipeline services program for a major offshore operator to assist with efforts to relieve increasing contact stress between a gas export riser and platform jacket offshore East Malaysia.

Due to changes in seabed conditions, the platform jacket had moved, producing stress on the gas export riser attached to the platform jacket. The stress was most acute at the contact point between the bracings - or riser clamps - that anchor the riser to the platform structure. Concerned that the amount of stress developing at the contact point could eventually damage the riser, the operator decided that the best solution was to cut out and remove a section of the jacket bracing. Removal of the brace would not affect the technical integrity of the structure.

To ensure that the bracing could be safely removed from the pipeline, the customer requested TDW to isolate the affected section of the subsea line by inserting and setting a remotely-operated SmartPlug isolation tool in the line approximately 100m from the platform. By doing so, only a short section of the pipeline had to be depressurized and isolated while the bracing was removed. The only alternative would have been to depressurize the entire pipeline, which would have been extremely time consuming and costly. Further complicating the situation was the fact that the line is tied in to another major pipeline that extends to a central riser complex. This line would have had to have been bled down as well, causing major disruption to overall production from the field.

Before the pipeline could be isolated, however, it became apparent that one of the topside motor-operated valves (MOVs) closest to the pig launcher would not open properly, so it would have to be replaced in order that the SmartPlug tool could reach the point of isolation. To rectify this, TDW performed a hot tap and STOPPLE plug isolation on the line at a point located on the riser above the shutdown valve (SDV), thereby providing double-block isolation so that the operator could safely replace the malfunctioning MOV. Once the MOV was replaced, TDW launched the SmartPlug tool to the set location in order to isolate the line connected to the jacket bracing, which required a section removed. The line was isolated for five ¬days, which allowed a diving contractor to safely remove the bracing without disrupting production. The SmartPlug tool was then unset and retrieved back to the launcher.

Unexpected situation demands full range of pipeline services
As a result of the unforeseen requirement to replace the MOV, the challenges faced by the customer grew significantly. TDW worked closely with the customer to make certain that, in spite of the MOV replacement, the bracing would be safely removed within the original timeframe. First, TDW manufactured a special custom fitting for the hot tap and STOPPLE plugging operation at its manufacturing plant in Tulsa, Oklahoma in a very short time. TDW then managed the entire operation, working closely with its teams in Norway, Belgium and Singapore, and collaborating with its network of trusted specialists to provide welding, and nitrogen and water pumping services. TDW performed all this in just four months.

“Our customer was faced with a unique and pressing challenge: to relieve the increasing stress on the riser by removing the subsea bracing, without disrupting production,” said Rolf Gunnar Lie, Business Development Manager – Asia Pacific for TDW. “The fact that a defective MOV prevented us from immediately isolating this line so that the bracing could be removed safely could have been a real setback, delaying this critical work for months. In addition to SmartPlug pressure isolation services, TDW has deep experience in hot tap and STOPPLE plugging services, so we were able to help solve this problem and move forward rapidly,” he added. TDW made it possible for the customer to extract the bracing, which alleviated the growing pressure on the riser, ensuring that it continues to operate safely.

TDW’s relationship with the operator dates back 12 years, supplying pipeline pressure isolation services to facilitate safe maintenance activities on export lines and pipeline tie-ins. This recent operation was executed as part of a framework agreement between the two companies, which was extended in 2012.

Construction works trigger increased demand for isolation services

With operators keen to protect live pipelines and maintain production while construction or repair works take place, TDW reports increased demand for its specialist pipeline isolation services, particularly in Asia Pacific. By isolating a designated section of a pipeline with its SmartPlug technology, customers avoid the trouble and expense of having to completely depressurize the entire line. In addition, the line can remain isolated for extended periods - months, if necessary - while work is carried out, or if work is delayed due to inclement weather or other extenuating circumstances.

tdwilliamson.com

 

  • Photo courtesy of T.D. Williamson

    Photo courtesy of T.D. Williamson

Maritime Reporter April 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Ship Repair & Conversion

BV Upgrades RAM Software

To help offshore operators and contractors get more out of their assets and develop projects more cost-effectively, Bureau Veritas has supercharged its reliability,

Hospital Ship Up to Speed with AMOS

SpecTec will work with Mercy Ships to migrate its current system Business Suite to AMOS Enterprise Management Suite (EMS). Mercy Ships’ Africa Mercy, the world’s largest hospital ship,

Ecochlor BWTS

Ballast water treatment technology developer Ecochlor Inc. presented a project case study at CMA Shipping 2015, a case study which covered the retrofit of Ecochlor’s

Offshore

BV Upgrades RAM Software

To help offshore operators and contractors get more out of their assets and develop projects more cost-effectively, Bureau Veritas has supercharged its reliability,

Intelligent Fender System Completes Offshore Trial

Strainstall, part of James Fisher and Sons plc, announced the completion of the world’s first Intelligent Fender System (IFS) trial with energy companies SSE and RWE at Suffolk-based wind farm,

Maritime Tension Dominates Southeast Asia Summit

Southeast Asian leaders edged closer to open criticism of China's land reclamation in the disputed South China Sea at a regional summit on Monday, as the Philippines

Energy

BHGI-designed ATB Unit Under Construction

Bristol Harbor Group, Inc. (BHGI) informs it is currently completing the detail design phase of a 399’ x 74’ x 30’ 80,000 BBL double hull oil tank barge and a 120’

Maritime Tension Dominates Southeast Asia Summit

Southeast Asian leaders edged closer to open criticism of China's land reclamation in the disputed South China Sea at a regional summit on Monday, as the Philippines

Lagos Port Drags on Africa's Top Economy

Ruling party reforms improved Apapa port; shippers still face delays and corruption. The road leading to the Lagos port, which handles nearly everything that Africa's biggest economy imports,

News

US Designates Three Marine Highway Projects

U.S. Transportation Secretary Anthony Foxx has designated three new Marine Highway Projects.   The Mississippi and Illinois Rivers, previously designated as the M-55 and M-35,

Long Beach Picketers Not Striking -Port CEO

Port of Long Beach CEO Jon Slangerup issued a statement addressing the status of picketing truckers at the harbor, pointing out that the demonstration is not a strike.

Baltic Index Flat on Muted Shipping Activity

The Baltic Exchange's main sea freight index, which tracks rates for ships carrying dry bulk commodities, remained flat on Monday on muted shipping activity.   The overall index,

Maritime Safety

IMO Forum Aims to Rebuild Somalia's Maritime Sector

A three-day Stakeholders Forum will be held April 27-29 to review draft guidelines for the establishment of a Somalia Maritime Administration, coordinated and funded

London P&I Club Issues Recommendations on Bauxite Cargoes

The London P&I Club has issued a list of recommendations to owners contemplating the carriage of bauxite cargoes in the wake of renewed concerns about the dangers

Shipoweners Warned to be Prepared for Migrant Rescues

The North P&I club has warned its shipowner members of the need to be properly prepared to meet their moral and legal obligations to rescue migrants at sea. In

Offshore Energy

Intelligent Fender System Completes Offshore Trial

Strainstall, part of James Fisher and Sons plc, announced the completion of the world’s first Intelligent Fender System (IFS) trial with energy companies SSE and RWE at Suffolk-based wind farm,

Maritime Tension Dominates Southeast Asia Summit

Southeast Asian leaders edged closer to open criticism of China's land reclamation in the disputed South China Sea at a regional summit on Monday, as the Philippines

JSMEA Offers Access to Japan’s Offshore Suppliers

New website and brochure provide a comprehensive list of Japanese suppliers to the offshore industry The Japan Ship Machinery and Equipment Association (JSMEA)

 
 
Maritime Careers / Shipboard Positions Maritime Standards Navigation Offshore Oil Pipelines Pod Propulsion Ship Repair Shipbuilding / Vessel Construction Sonar Winch
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.3126 sec (3 req/sec)