Desmi GP User Manual

Contents

Desmi GP User Manual Manual pdf 65 page image

DESMI PUMPING TECHNOLOGY A/S P a g e | - 57 -Tagholm 19400 Nørresundby - DenmarkPhone.: +45 96 32 81 11Fax : +45 98 17 54 99E-mail: desmi@desmi.comwww.desmi.com17.2.2 Service life – ball/roller bearingsBall/roller bearings must be replaced as indicated below, to ensure explosionprotection.Ball bearings with two seal rings have a limited service life, after which they must be replaced.The ball/roller bearings’ minimum service life is shown in the tables in Figure 38 – Figure 39The ball/roller bearings’ service life is reduced to 90% of the value indicated if the pump is to beused in a potentially explosive environment.Example: Ball/roller bearing’s service life = 10,000 hours (non-ATEX)= 9,000 hours (ATEX)The bearing’s service life is also halved for every temperature increase of 15C above 70C –for both Atex pumps and non-Atex pumps.Example: Temperature: up to 70°C = 9000/10,000 hours (ATEX/non-ATEX )85°C = 4500/5,000 hours (ATEX/non-ATEX )ATEX