polypropylene tank

polypropylene tank

Currently, 100% virgin plastic is used in manufacture due to concerns over longevity in the field - in particular, with respect to exposure to ultra violet (UV). If, however, research could lead to incorporation of recycled material, then significant inroads may be made into reducing this impact. The feedstock energy in polypropylene could be also recovered by incineration of the plastic tank at the end of its useful life, although gains would be partially offset by a further release of greenhouse gases. It is estimated that the thermal disposal of a polypropylene tank (115 kilograms) after its useful life releases approximately 360 kg of CO2 while the CO2 emissions from the end-of-life disposal for concrete tanks (in terms of crushing and subsequent land filling) are unknown.
The plastic tank appears to be more attractive, however, when the key factor of transportation to customer sites is taken into account. To assess this in more detail, a model was devised to analyse the situation and incorporate the crucial impact of the distance the tank is transported. This model was developed on the assumption that within 50 km of the factory, tanks would be delivered by small and medium sized trucks, and for longer hauls, sets of tanks are delivered on 12 m semi-trailers. Unlike the concrete tanks, plastic tanks can be stacked (typically 4, as shown in Figure 2) and they have a much lower mass (115 kg) compared to the concrete tank (2500 kg). As a consequence, a typical long-distance (> 50 km) trailer load will be 24 plastic tanks for use in septic systems or 12 for use in aerated systems (more complex inner-components), as compared to only 6 concrete tanks. As a result, substantial environmental burden savings in terms of overall life cycle emissions per 3000 L tank were identified for those manufactured in polypropylene

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polypropylene tank

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