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FEATURE On the Move Central Stone's portable plants are set up in a quarry and are oper‐ ated until a sufficient stockpile of aggregate is accumulated, ac‐ cording to Moss. Then, the entire plant is moved to a different quarry to crush and stockpile material there. "We will probably move this plant to four different quarries over time," says Moss. "We may stay in one place from six months to a year at a time and then move to another quarry, which can be up to 85 miles away." When it needs to be moved, the 1.5 MW generator set will be placed on a flatbed trailer and moved to a new site, according to James Papenhausen, director of safety, purchasing and mainte‐ nance for Central Stone. "The generator is sitting on the ground for the time being, but we will eventually permanently install it on a drop‐ bed trailer for more convenient transportation." Both Moss and Papenhausen say that the MTU Onsite Energy gen‐ erator set has been working flawlessly for the upgraded portable rock crushing plant, ensuring that the aggregate stockpiling opera‐ tions will keep up with customer demand. E Codes and Standards for Onsite Power Systems Codes and standards help ensure uni- formity and quality of onsite power systems, although manufacturers such as MTU Onsite Energy often exceed minimum requirements. Some codes and standards apply to all onsite power generation systems, while others apply only when required by a particular ap- plication or customer. Here is a closer look at the standards for both design and manufacturing standards and for safety and perform- ance, plus code-compliance informa- tion specific to generator sets from MTU Onsite Energy: Design and Manufacturing Standards Standards that apply to all generator sets are those established by the Inter- national Organization for Standardiza- tion (ISO). ISO defines how to measure and rate many quality and perform- ance parameters. ISO standards that are relevant to onsite power genera- tion systems are: ■ ISO 8528 – Describes how to estab- lish ratings, measure performance and evaluate engines, alternators, controls and switchgear. This stan- dard also defines test methods for measuring vibration and sound. ■ ISO 3046 – Deals with important engine-related matters such as power ratings, fuel consumption, vi- bration and test methods. Compli- ance with ISO 3046 is usually noted on a generator set's specification sheet. ■ ISO 9001 – Describes processes manufacturers must use to manage quality in their facilities. ■ ISO 14001 – Defines environmental management practices in manufac- turing facilities. Central Stone's portable rock crusher may stay in a quarry up to one year stockpiling stone before being moved to another location. In cold weather, a 50 kW MTU Onsite Energy auxiliary generator set (left) is used to keep both the crusher and the large generator set warm overnight. 24 ROCKproducts • OCTOBER 2011 www.rockproducts.com ■ ISO 17025 – Deals with testing and calibration of instruments used to measure performance and quality.