Many harbours and coastal areas may only be approached by ships with sulphur-free fuels. Liquefied natural gas (LNG) drives or dual-fuel engines that can be operated with gas as well as with heavy oil are the prevailing option.
The use of LNG reduces emissions significantly. In gas mode, CO2 emissions are reduced by 25%, NOx by 85% and SO2 by up to 99%. Economic reasons also speak for LNG; according to a survey of the marine engineering office Cotenaval, ships make a saving in fuel of up to 86% by using LNG. This trend is asserting itself worldwide. In the meantime, more than 100 ships are being operated using LNG, and more are being put into operation. Two thirds of these ships are equipped with valves from Herose.
The company supplies complete solutions for the infrastructure, storage and transport of LNG, as well as for decentralised liquefaction and regasification facilities.
The increasing use of LNG requires a comprehensive LNG infrastructure - including unloading terminals, LNG tankers, filling stations for natural gas driven HGVs, decentralised energy facilities in industrial operations, and an increase in storage and bunker stations.
There are particularly high regulations and requirements for LNG facilities. Natural gas is liquefied at a temperature of -161°C. The valves and systems used are therefore subject to extreme challenges. When filling with LNG, high temperature changes and the harsh ambient conditions of the maritime industry burden the materials used. For this reason, Herose designs all components of the valves for durability and offshore operation, and they are classified in accordance with the specifications of leading classification societies (such as DNV GL, BV, LR, ABS, RINA and CCS) and are being used worldwide.
LNG valves and fittings must also function safely under extreme conditions, and emergency shutdown valves must guarantee an emergency shutdown at all times. With Herose valves, the positions 'open', 'closed' and 'emergency manual actuation' are reliably detected using sensors. Moreover, the opening and closing operation of the valve can be controlled by run-time monitoring on the facility.
Strict requirements on fire safety also apply for highly flammable natural gas. For LNG use, the Herose valves are specially approved for fire safety according to ISO 10497.
Herose consults with plant engineers about the protection against excessive pressure in containers and line systems, and with the storage and transport of LNG gas and cryogenic industrial gases up to -269°C. Herose accompanies the plantengineering designers through the entire process of small and mid-scale LNG applications.
Herose also provides consultation about the optimum dimensioning of safety, shut-off and control valves. In doing so, the valves are selected matching the actuator and the overall concept of the facility. On request, Herose can put a finished package together that is best suited for all installations of the LNG project.
With a complaint rate of only 0.04%, Herose is internationally renowned as a quality supplier and sets standards for safety in the handling of technical gases, vapours and liquids. For a higher durability, the drive components also have a seawaterresistant coating. Every pressure-bearing component is marked for traceability and can therefore be traced back at any time.
As a family-owned company, Herose is experienced and flexibly organised for the field of dynamic LNG projects. Herose has been developing, producing and supplying valves for the cryogenic, industrial and energy sectors for over 140 years. In China alone, more than 500 projects have been carried out for small-scale LNG applications.
For safe operation, the cryogenic LNG already requires an extremely clean surrounding during the installation of an LNG facility. For example, if the components are not stored free of dust and dirt, leaks might occur after assembly. Even the usual pressure test with brackish water may put the operational safety of gas facilities at risk. These requirements differ significantly compared with the operation of conventional fuels. At the shipyard and on ships, the handling of LNG valves therefore requires completely different arrangements and working processes. The experts from Herose have extensive experience with such conversion processes and are available as project consultants. On request, they will accompany the implementation of the LNG project on-site in order to provide and ensure best practice.