Flow Meters Provide LNG “Boil Off” Solution

Posted by Eric Haun
Thursday, January 16, 2014
Image: Allison Engineering

Level and flow instrumentation suppliers Allison Engineering have enjoyed success with a specialist flow meter application for their ST110 Gas Flow Meters being used on board LNG ships to measure boil-off gas, the natural wastage gas generated in the storage tanks. As the demand for Liquefied Natural Gas (LNG) has grown significantly in recent years so has the need for increased transportation capacity. Subsequent expansion of trade has resulted in a large expansion of tanker fleets where today LNG ships are typically carrying up to 266,000 m3 and sailing worldwide.

To facilitate transportation, the process involves natural gas being cooled down to minus 163ºC at atmospheric pressure, at which point the gas condenses to a liquid ready for transportation via tankers. The tanks on board an LNG carrier effectively function as giant thermoses in order to keep the liquid gas cold during storage. However, no insulation is perfect and the liquid is often boiling during the voyage and the solution is for reliquefaction and boil-off.

Typically LNG tankers are powered by steam turbines with boilers which are dual-fuel so they can run on either methane or oil, or a combination of both and conveniently the boil-off gas which is produced is diverted to the boilers and used as fuel for the vessel. However, where low emission zones exist, especially within European Union waters, it is mandatory for tanker operators to accurately measure how much boil-off gas they are using in their engines, as part of MARPOL Annex Vl, the current marine propulsion regulations.

Accurate and reliable measurement and specifically, in-line calibration and verification of boil-off gas, is crucial to tanker operators helping them to comply with current regulations.

The ST110 is unique in its ability to be functionally tested and calibrated without the need to remove the sensor from the pipeline. It features an internal purge tube that runs the length of the sensor and allows the operator to generate a known flow across the sensor element. The resultant signal output can then be compared to the factory baseline test certificate.

The ST110 flow meter is ATEX certified and complies with the ETS phase ll requirements for carbon trading. Materials of construction is 316 stainless steel for the housing and Hastelloy C for wetted parts, with control options via 4-20mA signal, HART, Profibus PA and Fieldbus H1 as required. It can operate at process temperatures up to +450ºC and offers a turndown ratio of 1,000:1.

allison.co.uk
 

Maritime Reporter August 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

New Products

VIKING Steps Up Pace of Innovation at SMM

This year’s SMM in Hamburg will see VIKING release more innovations than at any other point in its 50-year history, including new developments in PPE clothing,

Fortum Buys Stake in Wave Power Startup

Finland's top utility, state-controlled Fortum, on Monday said it has acquired a 14 percent stake in Finnish wave energy developer Wello. Wello has developed

RIMPAC Exercise Puts LCS Through Paces

It was the middle of May, and the littoral combat ship Independence was operating out of San Diego, testing components of the mine warfare mission package. The mission is one that,

Tanker Trends

ClassNK's Noboru Ueda Attends KOTC Delivery Ceremony

Mr. Noboru Ueda, Chairman and President of ClassNK attended the delivery ceremony for the M/T Al Yarmouk, constructed at Daewoo Shipbuilding & Marine Engineering Co.

More German Shipowners Look to Gibdock for Repairs

Gibdock remarks it has continued to see its stock rise amongst the German shipowner community over the past year. Indeed the Gibraltar ship repair yard’s recent

Tankship Owners TORM Get Credit Facility Extension

Denmark-based TORM say that all lenders have supported the agreement to extend the existing Super Senior Working Capital Facility by six months until 31 March 2015

Energy

VIKING Steps Up Pace of Innovation at SMM

This year’s SMM in Hamburg will see VIKING release more innovations than at any other point in its 50-year history, including new developments in PPE clothing,

ClassNK's Noboru Ueda Attends KOTC Delivery Ceremony

Mr. Noboru Ueda, Chairman and President of ClassNK attended the delivery ceremony for the M/T Al Yarmouk, constructed at Daewoo Shipbuilding & Marine Engineering Co.

Fortum Buys Stake in Wave Power Startup

Finland's top utility, state-controlled Fortum, on Monday said it has acquired a 14 percent stake in Finnish wave energy developer Wello. Wello has developed

LNG

Skangass Granted Permission for LNG Terminal

The Swedish Government (Länsstyrelsen in Dalarnas Län) has granted Skangass permission to build and operate a new Terminal for LNG (Liquefied Natural Gas) within the harbour in Gävle, Sweden.

Policy Uncertainty Threatens to Slow Renewable Energy Momentum

IEA forecast sees renewable power as a cost-competitive option in an increasing number of cases, but facing growing risks to deployment over the medium term. The

SHIPPINGInsight Extends Early-bird Registration

SHIPPINGInsight 2014 is extending the deadline for early-bird registration to Sept. 15. Attendees registering online at www.shippinginsight.com/choose-event prior to midnight Sept.

Marine Equipment

VIKING Steps Up Pace of Innovation at SMM

This year’s SMM in Hamburg will see VIKING release more innovations than at any other point in its 50-year history, including new developments in PPE clothing,

RIMPAC Exercise Puts LCS Through Paces

It was the middle of May, and the littoral combat ship Independence was operating out of San Diego, testing components of the mine warfare mission package. The mission is one that,

MARAD Shipbuilding Loan Guarantee

The launch of the Bravante IX, built in a U.S. shipyard, was from the investments made by the Maritime Administration (MARAD) just three years ago. The investment

Maritime Safety

Ulrich Ganz of Bernhard Schulte Joins Tundra

Tundra Group is delighted to announce the addition of the former Senior Company Security Officer (CSO) of Bernhard Schulte Shipmanagement (BSM), Captain Ulrich Ganz,

USCG Medevacs Mariner in Port Alexander, Alaska

The Coast Guard medevaced an 87-year-old female reportedly suffering from complications associated with a lower back injury aboard the fishing vessel Annie B in Port Alexander, Sunday evening.

VIKING Saatsea Puts Crew Training in its Place

VIKING Saatsea will be at SMM 2014 to showcase the revolution it has brought about in crew training – moving everything on board to cut costs, speed up certification,

 
 
Maritime Contracts Maritime Security Maritime Standards Navigation Pod Propulsion Port Authority Salvage Ship Electronics Ship Simulators 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: 0.1912 sec (5 req/sec)