Safer. Smaller. Lighter in weight. These are three good reasons to consider replacing conventional exchangers onboard liquefied petroleum gas (LPG) carriers with the new AlfaNovaM (ANM) HP 400. Engineered for use as a LPG cargo condenser and/or heater, this gasket-free, all-stainless plate heat exchanger offers higher efficiency, greater temperature flexibility, and lower total cost of ownership too.
Looking for ways to meet the requirements of the seventh edition of the "Ship Inspection Report for Chemical and Gas Tankers" published by the Chemical Distribution Institute (CDI)1? Look no further than the ANM HP 400. Alfa Laval has adapted our proven fusion-bonded AlfaNova M heat exchangers to the cargo conditioning requirements of LPGs for use in indirect reliquefaction systems.
Direct operating condenser Indirect operating condenser with ANM
The indirect system offers these major advantages:
• No risk of leakage: In the unlikely event of a gas leak in the ANM HP 400, gas enters a closed intermediate loop and remains onboard unlike direct systems where gas can leak to seawater discharge side of the condenser and into the harbour.
• Maintains high performance: The seawater side is fully accessible for cleaning purposes in the gasketed seawater heat exchanger. A high performance could therefore be maintained without CIP solutions.
• The seawater cooler is necessary in order to fulfil the Chemical Distribution Institute (CDI) directives for cascade systems used in cargo heating. The same seawater cooler can be used in a cascade system when condensing cargo in an indirect configuration. An indirect versus a direct operating cargo condenser is hence beneficial from a commercial point of view since no titanium material is needed in the indirect cargo condenser.
Using the ANM HP 400 as a cargo condenser in indirect systems offers:
• Energy savings: The ANM HP 400 uses a lower condensing pressure than other cargo condensers.
• Faster port-to-port time: Compared to other condensers, the ANM HP 400 has higher condensing capacities, which reduces port-to-port time and thereby raises transportation efficiency and lowers costs.
• Lightweight and compact: At just under 400 kgs. (900 lbs.), the ANM HP 400 is much lighter and has a smaller footprint (0.5 m2/ 5.4 sq. ft.) than comparable condensers.
Lauritzen Kosan LPG carrier first with ANM HP 400
Danish shipping power Lauritzen Kosan, the gas carrier division of J. Lauritzen A/S, is the first to install the ANM HP 400 on one of its LPG carriers. The company currently operates six LPG carriers that use indirect systems with central coolers and stainless steel AlfaRex plate heat exchangers as cargo condensers. By installing the ANM HP 400 alongside the AlfaRex unit, Lauritzen Kosan intends to minimize power consumption in order to keep the operating costs of its reliquefaction plant as low as possible and reduce port-to-port time.
LNG fuel applications ahead?
With interest in the LPG cargo condenser/heater growing, Alfa Laval is also exploring the possibilities of applying fusion-bonding technology to marine LNG fuel applications.
“We are aware of the keen interest in using liquefied natural gas (LNG) as fuel in order to comply with the new International Maritime Organization regulations in sulphur emission control areas (SECAs),” says Johan Lennartsson, Alfa Laval Marine & Diesel’s regional marketing manager responsible for working with contractors and shipyards for liquid gas carriers. “We believe that, in the future, owners of LNG-fuelled vessels together with Alfa Laval will find many uses for ANM HP 400 in LNG fuel-handling systems."
1) CDI is one of the major standard vetting inspection criteria on the market for LPG vessels. The objective of CDI is to provide a single set of reliable and consistent inspection data that chemical companies can use with confidence when chartering a LPG vessel.
About AlfaNova M HP 400
Newly introduced to the marine portfolio, the AlfaNova M HP 400 is a fusion-bonded plate heat exchanger that operates at temperatures ranging from between -196 oC to +550 oC. Constructed completely in stainless steel, it can be used for LPG/E reliquefaction of a wide range of aggressive media, including ammonia, as for LNG fuel duties. This is made possible by Alfa Laval’s uniquely patented active fusion-bonding technology.
Liquefied petroleum gas (LPG) is a portable, clean and efficient energy source, which is readily available to consumers around the world. LPG is a co-product of natural gas and crude oil production; its unique properties make it a versatile energy source that can be used in more than 1,000 different applications.
LPG is a clean energy solution, which emits 50% less CO2 emissions than coal and 20% less than heating oil, making it ideal for use in heating and cooking. LPG also improves both indoor and outdoor air quality by substantially reducing pollutants, which are hazardous to health such as SOx, NOx and particulate matter.
LPG accounts for approximately 65% of all cargo shipped by LPG carriers, followed by ammonia and petrochemicals (ethylene, propylene, vinyl chloride monomer, butadiene).