案件

Running on (good quality) compressed air

Train on rails in Norway
挪威
发布: 2010年10月26日
Industrial Measurements

压缩的空气of good quality is indispensable for the reliability and safety of railway operations. Contamination increases operating and maintenance chores and costs in numerous ways.

压缩空气的质量对现代火车中滚动库存应用的可靠性产生了巨大影响。例如,制动系统,火车的耦合,空调和气动门都由压缩空气供电。因此,被压缩空气的质量对整个火车的安全有直接影响。

To put it simply, compressed air of rolling stock applications needs to be very clean and dry, no matter what the conditions. The most common contaminants in compressed air are water, oil and dust – no wonder, as most of the applications are partly outdoors, exposed to heavily varying conditions, temperature and humidity, rain and snow.

监视露点钥匙

Norwegian company Nordisk TogTeknikk ANS (NTT) has helped rolling stock operators with their com- pressed air challenges for over 10 years. Located in Oslo, the company specializes in rolling stock management, component overhauls and repair, modifications, and product development and implementation.

“NTT is the only company on the Nordic market with advanced test equipment for compressor modules, making it able to measure compressor performance against all relevant parameters. One of our strongholds is the implementation of fully automatic and continuous dew point measurement for trains”, says Einar Hageskal, owner of the company. Dew point is one of the most important parameters to monitor to ensure the quality of compressed air at all times. Any excess moisture in the compressed air line may freeze, which causes obstructions or even fractured air lines and damaged pneumatic cylinders, resulting in malfunction of doors and brakes, for example. Even if not freezing, water corrodes metal surfaces, and water, oil and rust together increase wearing.

压缩的空气

Benefits from continuous monitoring

可以通过利用连续监视而不是间隔检查点露点值来实现其他好处。“在线露点监控系统使操作员有可能按时定位和纠正故障。Hageskal表示,水分可能起源于较干燥的滤清器周围的过滤器或周围的空气温度变化,或者塔式干燥机中的饱和硅胶,这可能会使不在线监测的情况下很难检测到它。”

Whatever the source of the moisture, discovering the problem early on means that corrective actions can be implemented faster. It helps avoid major problems that could lead to long and costly service breaks and lack of capacity. According to Einar Hageskal, the train needs to be taken out of service for a full week if the compressed air system gets wet – that’s how long it takes for the system to dry out.

As an additional benefit, continuous monitoring also means that regular maintenance actions can be performed less frequently without compromising the operation of the rolling stock applications.

Wanted: stable, precise and cost-effective solution

为了解决持续监控的问题,Nordisk Tog Teknikk帮助其一位客户涉足各种露点发射机,以识别正确的仪器。他们提出了三种可能的替代方案,其中之一是VaisalaDryCap®露点发射器DMT348。在实验室条件和实际火车中,这三个都经过了广泛的测试,即使在变化和恶劣的气候条件下,哪一个也将提供最可靠的测量。

“客户要求是该仪器需要在-30ºC露点上可靠地执行。仪表还需要适应不同的火车模型,其材料应保证至少持续10年。” Hageskal描述,并补充:

“最后,客户选择了DMT348。最终决定是基于成本效益做出的,而Vaisala愿意并且能够修改产品以满足客户的特定需求的事实。”

现在,发射器包括一个显示警报,如果超出了预设露点警报级别,该警报会警告火车上的人员。

同样的测量信号也可以馈送到火车的控制系统中。DMT348还具有数据记录功能,这对于能够轻松查看露点历史趋势以及在需要的情况下以跟踪仓库的问题至关重要。

终极测试:恶劣的冬天

去年冬天在欧洲大部分地区都非常寒冷和下雪,这为露点工具提供了证明其在恶劣和充满挑战的条件下的功能的机会。监测压缩空气系统中的水分有助于培训操作员克服各种挑战。

Vaisala DMT348是DMT340系列的一部分。