Power steering pump keeps blowing/failing

[P9RTA]

Been through 2 PAS pumps in the last month they seem to just blow after about a week and I'm left with PAS fluid all over my drive, anyone got any ideas to what could be causing this or am I just getting unlucky with my pumps? Thanks!

 

[P9RTA]

Been told could be PAS belt problem but want to rule out any other possibilities first!