Orbital vs longitudinal welding in PW

Hi,
i want to ask about welding in looping systen in pharmaceutical.
a lot of reference tell that for pharmaceutical PW good using orbital welding, but at the place i work they use longitudinal welding.
can somebody told what is the advantage and deficiencies using longitudinal welding in pharma water (PW) ?
and what was the risk for the product?
last, my company didnt want to change it to orbital welding because of the high cost. so what i must do if we still the longitudinal welding? do we have to cleaned everyday?
thanks