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

Ship Repair & Conversion

Added Value Innovation Drives Control of BWTS

Specifying for ballast water treatment systems can be a difficult process. Ian Hamilton, sales manager for marine electrical wiring control and instrumentation specialists CMR Group, offers guidance.

Hospital Ship Brought up to Speed with AMOS

SpecTec will work with long term partner Mercy Ships to migrate its current system Business Suite to AMOS Enterprise Management Suite (EMS).   Mercy Ships’ Africa Mercy,

Repair Yard Chosen for Lysblink Seaways

Cargo ship Lysblink Seaways will be towed to Inchgreen, Greenock for repair work after grounding last month on Scotland’s west coast.   The vessel, which ran aground February 18,

Offshore

Gulf of Mexico Oil Production on the Rise

Because of the long timelines associated with Gulf of Mexico (GOM) projects, the recent downturn in oil prices is expected to have minimal direct impact on GOM crude oil production through 2016.

Ferguson Appoints Partner OPS-OES

Ferguson Group Singapore, a specialist in the provision of DNV 2.7-1 / EN12079 offshore containers, reefers, tanks, waste skips, baskets, accommodation and engineering

Nabors Posts Quarterly Loss as Drilling Activity Slows

Offshore driller Nabors Industries Ltd reported a quarterly loss, hurt by lower drilling activity amid a slump in global crude prices.   The company posted a net loss of $891.

Energy

Oil Storage at Sea Stalls as Profit Play Fades

Traders are cutting plans to use tankers to store oil at sea as the price incentive recedes, the global head of oil at mining and commodities group Glencore's said on Tuesday.

Ferguson Appoints Partner OPS-OES

Ferguson Group Singapore, a specialist in the provision of DNV 2.7-1 / EN12079 offshore containers, reefers, tanks, waste skips, baskets, accommodation and engineering

Former BP Boss Browne is DEA Chairman

Lord John Browne heads DEA's supervisory board * LetterOne co-owners Fridman, Khan also join * Unit changes name to DEA Deutsche Erdoel AG FRANKFURT, March 3 (Reuters) - DEA,

News

Winter in US Northeast Takes a Toll on Ferries

With its black hull rumbling against a field of broken ice, the Warren Jr. slowly eased away from a dock in the Boston suburb of Hingham on Tuesday, aiming to clear

Shipping Industry Faces Shake Up

As global shipping grapples with its worst downturn in 30 years, private equity firms are unwinding massive bets made on the sector in a move set to accelerate

Gulf of Mexico Oil Production on the Rise

Because of the long timelines associated with Gulf of Mexico (GOM) projects, the recent downturn in oil prices is expected to have minimal direct impact on GOM crude oil production through 2016.

Maritime Safety

Winter in US Northeast Takes a Toll on Ferries

With its black hull rumbling against a field of broken ice, the Warren Jr. slowly eased away from a dock in the Boston suburb of Hingham on Tuesday, aiming to clear

USCG Marine Safety Alert

The U.S. Coast Guard issued a marine safety alert today to remind all gas carrier owners and operators to ensure that all personnel follow approved Safety Management

USCG Marine Safety Alert

The U.S. Coast Guard issued a marine safety alert today to remind vessel owners and operators to establish effective fuel oil changeover procedures during efforts

Offshore Energy

Gulf of Mexico Oil Production on the Rise

Because of the long timelines associated with Gulf of Mexico (GOM) projects, the recent downturn in oil prices is expected to have minimal direct impact on GOM crude oil production through 2016.

Nabors Posts Quarterly Loss as Drilling Activity Slows

Offshore driller Nabors Industries Ltd reported a quarterly loss, hurt by lower drilling activity amid a slump in global crude prices.   The company posted a net loss of $891.

Maersk Drilling Secures Contract for Newest Drillship

Maersk Drilling was awarded a contract from eni Ghana Exploration and Production Ltd. for employment of the newbuild drillship Maersk Voyager.   The contract

 
 
Maritime Careers / Shipboard Positions Maritime Security Maritime Standards Naval Architecture Offshore Oil Port Authority Salvage Ship Electronics Shipbuilding / Vessel Construction Sonar
rss | archive | history | articles | privacy | terms and conditions | 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: 0.9283 sec (1 req/sec)