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f+h Intralogistics 4/2016

f+h Intralogistics 4/2016

Special rope drum for

Special rope drum for explosionproof LNG wire rope hoist There are no simple catalogue solutions for hoists on LNG systems. Since the requirements vary depending on the pump manufacturer, plant manufacturer, EPC contractor and country of destination, customers benefit from reliable and customizable serial products. Stahl Cranesystems has, for example, designed a hoist with special rope drum for maintenance cranes on Chinese LNG tanks that fulfills the requirements of the Chinese market. Shenzhen LNG is already the third Chinese LNG terminal after Ningbo and Tianjin for which Stahl Cranesystems has supplied the explosion-proof crane technology to the plant manufacturer TGE Gas Engineering. The successful collaboration between the two German firms has already proven its worth in numerous other LNG and gas plants in Europe and Asia. The new LNG terminal in Shenzhen consists of four 160,000 m 3 liquefied gas tanks and was commissioned towards the end of 2015. Every LNG tank is equipped with a crane to place the liquefied gas pump on the bottom of the tank and to lift it out into the open air again for maintenance or repair work. Due to the potential explosion risk from evaporating gas, all electrical components must be constructed in explosion-proof design, which also applies to the crane technology used. In addition to this, further and stricter requirements than those in ATEX or IECex standards must be met in LNG applications depending on the operator and country of use (Image 01). Almost standard, but still exceptional 01 Explosion-proof switch boxes are designed for crane systems worldwide The specifications for LNG wire rope hoists in Chinese plants require a ratio between rope diameter and rope drum diameter (D/d ratio) that cannot be achieved with a standard hoist. Stahl Cranesystems has therefore developed rope drums with a larger diameter specifically for these wire rope hoists and deployed them successfully in the past years on the gas tanks at the Ningbo LNG and Tianjin LNG terminals (Image 02). The rope, which is firmly connected to the LNG pump, measures 13 mm in diameter. The standard diameter of the drum of the SH 6 wire rope hoist is 356 mm. A drum from the larger wire rope hoist series AS7 with a diameter of 456 mm is welded on to this drum in Stahl CraneSystems’s factory to increase the already very good D/d ratio from 27 to 35 without complex modification of the design of the series hoist. At the same time, it is possible to fulfill the customer’s requirement for an additional rope drum brake based on the proven module system of the SH series without problem by using the standard drum and standard frame – resulting in an economical solution in spite of all the modifications. RUBRIK CRANES AND HOISTS f+h Intralogistics 4/2016

The advantages of near-standard special solutions such as these LNG wire rope hoists are obvious: The individual components stem from our own serial production, their technical design is well-conceived and fully developed and a supply of spare parts is ensured for decades to come. The period of use is difficult to estimate, especially in the case of energy plants and offshore solutions – it is not seldom that the calculated period of use is exceeded and systems are used significantly longer than planned (Image 03). The durability, reliability and safety of the crane system can only be guaranteed over the long term if all important components are easily accessible for maintenance work and spare parts quickly available. Photographs: Stahl Cranesystems www.stahlcranes.com About Stahl Cranesystems Stahl Cranesystems GmbH, with head office in Künzelsau/Germany, has more than 120 years experience in crane construction. The manufacturer offers a full range of crane technology and crane components, including chain and rope hoists, winches, and light and small crane systems, as well as drive and control solutions. It is a world leader in explosion protected crane technology. Indeed, Stahl Cranesystems developed the first components for such applications as far back as 1926, thus contributing to today’s industrial standards. The company manufactures its products at the Künzelsau plant, but has 9 foreign subsidiaries. It has 700 employees worldwide. 02 These explosion-proof LNG wire rope hoists work with a special rope drum in order to fulfill special requirements MULTIMEDIA CONTENT Learn more about the achievement spectrum of the enterprise 03 LNG hoists are often exposed to wind and weather for years before they are used again