The turbines in shot blast machine must carry a heavy load and are exposed to a lot of stress. Over time this leads to ever increasing maintenance and operating costs along with a growing energy consumption. Frequently, the blast performance no longer meets the capacity and quality demands. In order to fulfill their shot blasting requirements in a cost-efficient and competitive manner companies usually invest in a new shot blasting system.

A persuasive modernization solution with a quick amortization

A renowned manufacturer of drivetrains and electronic controls was facing exactly this problem with a shot blast machine in its foundry. The responsible project managers at the company contacted TuneUp, a division of the Rösler Oberflächentechnik GmbH, that specializes in the modernization of shot blast equipment. On this occasion they learnt that the Rösler modernization and upgrade service covers not only Rösler equipment but extends to third-party machinery as well. After a comprehensive analysis of the current equipment condition the Rösler Retrofit experts presented a suitable technical solution along with a realistic amortization calculation.  The customer was impressed by the technical depth and short pay-back period of the proposed modernization concept.

Turbine replacement increases productivity and lowers costs

At the center of the modernization concept was the replacement of the two 22 kW turbines originally supplied with the shot blasting machine. The existing units were exchanged with high performance Gamma 400G-8 turbines in wear-resistant foundry version, also with a drive power of 22 kW each. They are equipped with eight curved throwing blades in „Y“-Design with a precisely calculated curvature. This generates an extremely high throwing speed along with a precise media guidance and results in an optimal efficiency. The unique characteristics of the Gamma turbines with a 45% higher blast performance allowed achieving the needed capacity increase.

Another feature of the new high performance turbines is that they require a lot less energy. The energy savings were an important reason for the overall  operating cost decrease of 34%.

Expenses for maintenance reduced by over two thirds

The unique design of the throwing blades produces not only a higher performance but allows using both blade sides by simply turning them around. Depending on the utilized blast media, this design feature, combined with the use of wear resistant blade material, for example, forged tool steel, results in a three times longer lifetime compared to conventional turbines. An innovative quick-change system allows easily and quickly changing the blades at the mounted turbine.  The usually required time-consuming dismounting of impeller, control cage and infeed pipe is no longer necessary. Overall this reduces the expenses for maintenance by more than two thirds.

Quick amortization produces a competitive edge

Based on the capacity utilization to-date, the productivity increase achieved by the upgrade and the cost savings the Retrofit investment will have paid for itself already after 1.1 years. The technical features of the modernized shot blasting machine and the quick amortization allow the user to improve his profitability  and consolidate and expand his competitive position in the market.