Prestressed concrete cylinder pipes

We ,XXXXX, are one of the major algerian companies dealing in hydraulics business :
pipes, fittings,watermeters, fire hydrants, irrigation hydrants, etc...we have been in
this business for about 9 years.
we are coming to you to ask you to give us a quote for an order of 33 (thirty three)
kilometers of pre - stressed concrete cylinder pipes in dn 900, pn 10 .
find the technical specifications below :
pccp pipes dn 900, pn 10 :
6. 5. 2. materials :
6. 5. 2. 1. aggregates
materia