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 October 2013 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Ship Repair & Conversion

Industry Professionals to Speak at ShipConstructor Conference

The speakers representing various companies at next week's SSI Americas ShipConstructor User Conference, October 7-9, 2014 in Mobile, Alabama, demonstrate SSI's

HII Appoints Brenton as Corporate Director

Huntington Ingalls Industries (HII) announced today that Capt. Kevin Brenton (U.S. Navy, Ret.) has joined the company as corporate director of customer affairs for submarine programs.

New Simulation Tool for Collision Reconstruction

BMT ARGOSS and BMT Surveys, subsidiaries of BMT Group Ltd, the international design, engineering and risk management consultancy, announced an innovative new service

Offshore

Norvestor to Become PG’s Largest Shareholder

Norvestor VI, L.P., a fund advised by Norvestor Equity AS, announced it has signed an agreement to invest in Ing Per Gjerdrum AS including its subsidiaries PG Hydraulics AS and PG Construction AS.

Crowley Receives Heavy-Lift Deck Barge in Singapore

Crowley Maritime Corporation’s solutions group announced today that it has received the first two of potentially four, new heavy-lift, ballastable deck barges (HDBs)

Signet Transports Second LLOG Rig to GofM

On September 14, five Signet Maritime ASD/Z-Drive tugboats, the SIGNET ENTERPRISE, SIGNET RELIANCE, SIGNET MAGIC, SIGNET WEATHERLY, and SIGNET VOLUNTEER successfully

Energy

Louisiana to Get Natural Gas Liquefaction and Fueling Facility

Tenaska Bayou LNG expected to meet growing marine, transportation and oil and gas exploration and production demand on the Gulf Coast Tenaska NG Fuels, LLC and Waller Marine, Inc.

ABB WinsTunisia's Gas Treatment Plant Bid

ABB, the leading power and automation technology group, has been awarded a $216 million contract to deliver a gas treatment plant to the South Tunisian Gas Project (STGP).

GasLog Closes First Option Vessels Dropdown

GasLog Ltd.  announced today the closing of the sale of two modern liquefied natural gas (“LNG”) carriers, the Methane Jane Elizabeth and Methane Rita Andrea,

News

NY Harbor Supply & Distribution Fall Reception/Buffet

More than 600 attendees are expected at the 52nd annual New York Harbor Supply & Distribution Fall Reception/Buffet for the energy and energy related industries

Kounalakis Joins OW Bunker N. America

OW Bunker, a reseller and physical supplier of marine fuels, announced the appointment of Georgia Kounalakis to its physical supply operation in North America.

Louisiana to Get Natural Gas Liquefaction and Fueling Facility

Tenaska Bayou LNG expected to meet growing marine, transportation and oil and gas exploration and production demand on the Gulf Coast Tenaska NG Fuels, LLC and Waller Marine, Inc.

Maritime Safety

USCG Cutter Rush Returns

The crew of Coast Guard Cutter Rush returned to its homeport following a successful 72-day deployment in the Central and Western Pacific, Monday. Rush departed

Report on MOL Comfort Incident is out

In response to the casualty of “MOL COMFORT” which occurred on 17 June 2013, ClassNK established the Investigative Panel on Large Container Ship Safety, comprised

NAT Tankship Rescues 150 in Mediterranean

Nordic American Tankers Limited ("NAT") says the one of its vessels, the 'Nordic Passat' performed a rescue operation, involving 150 people in the Mediterranean last Saturday afternoon,

Offshore Energy

N-Sea Completes Inaugural System Diving Scope

Inspection, maintenance and repair (IMR) specialist N-Sea has recently completed its inaugural diving scope with the TUP Diving System (Transfer Under Pressure).

Norvestor to Become PG’s Largest Shareholder

Norvestor VI, L.P., a fund advised by Norvestor Equity AS, announced it has signed an agreement to invest in Ing Per Gjerdrum AS including its subsidiaries PG Hydraulics AS and PG Construction AS.

Signet Transports Second LLOG Rig to GofM

On September 14, five Signet Maritime ASD/Z-Drive tugboats, the SIGNET ENTERPRISE, SIGNET RELIANCE, SIGNET MAGIC, SIGNET WEATHERLY, and SIGNET VOLUNTEER successfully

 
 
Maritime Contracts Maritime Standards Naval Architecture Navigation Pod Propulsion Port Authority Ship Electronics Ship Repair Sonar Winch
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: 0.1970 sec (5 req/sec)