DNV介绍的“Triality” - 原油油轮，LNG燃料的概念 - 在2010年。

海洋环境保护委员会（MEPC）国际海事组织（IMO），在其第65届会议，审议并同意提出的修正案（草案）“防污公约”附则VI第13氮氧化物（NOx）的背景下，修改的日期“第三级”标准的排放控制区域内（ECAS）2021年1月1日，从目前的生效日期2016年1月1日实施。海上环境保护委员会第66届会议审议的修订草案将发给在2014年，与采用。

NOx的控制要求适用于安装的船用柴油发动机的输出功率超过130千瓦，不同层次（层）的控制采用基于船舶建造日期。第三级控制只适用于指定的船舶，同时经营在指定限制氮氧化物排放量（目前北美排放控制区和美国加勒比海地区）的出口信贷。等领域之外，“第二层”的控制应用。

MARPOL附则VI第13.10条要求进行审查技术的发展，以实现2016年第三级的NOx排放限值的状态。回顾2013年可完成。

第三级控制得到落实，到2015年，运营商将不得不选择安装废气清洁系统称为洗涤或转用低硫燃油的所有船舶在非洲经委会经营。液化天然气（LNG）的使用，例如，是一个解决方案，几乎没有硫含量，其燃​​烧产生低NOx相比，燃料油，船用柴油。

的DieselNet制品提交的MEPC对应集团的一份报告说，在第65届会议上，审议所需的技术，以符合Tier III的NOx标准的提供，并建议三级氮氧化合物排放的规定生效之日起在规定13.2.2 13.5.1。“防污公约”附则VI应予保留。

然而，一个俄罗斯领导的代表团根据PortNews，成功地认为，只有技术在确保落实规定的标准（SCR技术的基础上尿素水溶液）在今天的市场有本质的弊端。

DieselNet解释说，修正案草案将送交缔约国政府考虑，然后提交给海上环境保护委员会第66届会议于2014年，以领养为出发。一些代表团强烈反对这一决定，并保留自己的位置，这样的决定是可能，以满足强烈反对。反对团体也可能寻求替代措施，通过标准比2021年提出的实施，充分利用当前的投资在新技术的发展和造船，包括液化天然气为燃料的船舶。

àDNV报告优惠2020项目超过10艘新造船舶在未来10年将交付液化天然气（LNG）燃料发动机，如果重油（重油）和LNG增加之间的价格差。“如果液化天然气的价格下降到低于30％的HFO，液化天然气的摄取增加至13％，并且在极端情况下的液化天然气的价格低70％的HFO，新造船舶的LNG购是30％。在总人数中，13％，相当于约1000艘。“

The Marine Environment Protection Committee (MEPC) of the International Maritime Organisation (IMO), in the context of its 65th session, considered and agreed to proposed draft amendments to MARPOL Annex VI regulation 13 on Nitrogen Oxides (NOx), to amend the date for the implementation of “Tier III” standards within emission control areas (ECAs) to 1 January 2021, from the current effective date of 1 January 2016. The draft amendments will be circulated for consideration at MEPC 66 in 2014, with a view to adoption.

NOx control requirements apply to installed marine diesel engines of over 130 kW output power, and different levels (Tiers) of control apply based on the ship construction date. Tier III controls apply only to specified ships while operating in ECAs designated to limit NOx emissions (currently the North American Emission Control Area and the United States Caribbean Sea Area). Outside such areas, “Tier II” controls apply.

Regulation 13.10 of MARPOL Annex VI called for a review of the status of technological developments to implement the 2016 Tier III NOx emission limits. The review was to be completed by 2013.

Had Tier III controls been implemented, by 2015 operators would have had to choose between installing exhaust gas cleaning systems known as scrubbers or switching to low sulphur fuel for all ships operating in an ECA. Use of Liquefied Natural Gas (LNG), for example, is a solution that has virtually no sulphur content and its combustion produces low NOx compared to fuel oil and marine diesel oil.

A DieselNet article says that a report from the MEPC Correspondence Group tabled at the 65th session meeting, considered the technologies needed to meet Tier III NOx standards to be available and recommended that the effective date of the Tier III NOx standards in regulations 13.2.2 and 13.5.1. of MARPOL Annex VI should be retained.

However, according to PortNews, a Russian-led delegation successfully argued that the only technology available in the market today among those ensuring implementation of the required standards (SCR-technology based on urea-water solutions) has essential drawbacks.

DieselNet explains draft amendments will be sent to contracting governments for consideration and then submitted to MEPC 66 in 2014, with a view to adoption. A number of delegations strongly opposed the decision and reserved their position so the decision is likely to meet strong opposition. Opposing groups may also seek alternative measures for adoption of standards earlier than the proposed 2021 implementation, to take advantage of current investment in new-technology developments and shipbuilding, including LNG-fuelled ships.

A DNV report Shipping 2020 projects more than 1 in 10 newbuildings in the next 10 years will be delivered with liquefied natural gas (LNG) fuelled engines, more if the price differential between HFO (heavy fuel oil) and LNG increases. “If the LNG price goes down to 30% below HFO, the uptake of LNG increases to 13% and, in the extreme case of LNG price 70% below HFO, the LNG share of newbuildings is 30 percent. In total numbers, 13% is equivalent to approximately 1,000 ships.”