PETpla.net Insider 05 / 2019

COMPRESSORS PET planet Insider Vol. 20 No. 05/19 www.petpla.net 32 Less speed, less strain Despite a higher rotational capa- bility, the M-type air compressor actually has lower piston speed. This means that lower pressure-volume (PV) values put less strain on bear- ings, bushes and other components, which helps with reliability, machine life and energy consumption. Core parts, like piston rings and packings, are from specialist manufacturers and designed to cope with 24/7 continu- ous operation. The maintenance cycle is over 8,000 working hours; normal service warranty is five years. New compressors for VV VV Group had been using two sets of L-type compressors at its head- quarters in Xuzhou City. Its problems with noise, vibration and unreliability lead them to seek alternatives. After a comprehensive review and analysis of the domestic and interna- tional air compressor market, VV Group adopted a 16m³/min Shangair M-type air compressor for a PET bottles blow- ing and filling production line at its plant in Wuxi city, Jiangsu province. It was put into operation on August 8, 2018 and the experience was sufficiently good that the company decided, at the beginning of 2019, to replace the two sets of L-type air compressors, with total installed power of 550kW, in its Xuzhou headquarters facility with two Shangair 26m³/min machines. The cus- tomer reported that it expects to save approximately CN¥ 500,000 (~€66,000) in electricity costs per year. Energy savings in practice Anhui Yingjia Group expressed doubts as to whether the fre- quency conversion range and energy- saving effect of the M-type air compressor could be as claimed but it replaced its old screw-booster type air compres- sors with Shangair equipment in 2017. In October that year, a survey of the energy con- sumption of the whole plant found that air pressure consumption had decreased by 36.24%, compared with the same month a year earlier. The Shangair M-type air com- pressor frequency conversion system uses an AC/DC/AC general- purpose inverter: the standard fixed- frequency AC power of the grid is converted into DC power through the thyristor, and then inverted into frequency-controllable AC. Varia- tions in pressures are automatically controlled, keeping output pressure constantly around the set value and balancing air production precisely with consumption. This is of particu- larly significance for large com- pressors that supply air to a pipe network; a stable supply pressure means that product quality will also be improved. The M-type air compressor fea- tures advanced residual gas recov- ery and injection boosting functions, which are of particular benefit to the PET industry, especially hot- filling and blowing operations. If the user chooses the residual air recovery and then injects the boost- ing function, along with appropriate modifications to the blow mould- ing machine and mould system, the Shangair compressor can re-inject a large amount of residual air recov- ered from the blowing bottle, into the compressor’s third-stage. The Two new compressors in VV group headquarter New compressors in VV group Wuxi branch Shangair’s DCC app for mobile phones