Wellpartner have several HP Riser systems available for rental:
• ID: 18 3/4″
• BOP Interface: NT-2
• WH Connection: H-4
• Riser Connection type: Flanged
• Pressure rating: 345 – 463 bar
• Temperature rating: 65 – 95 deg C
• Tension system: Clamp-on Tension Ring
Data sheet:
http://www.wellpartner.no/wp-content/uploads/2015/07/hp-riser-system-web.pdf
Link to page:
http://www.wellpartner.no/products/high-pressure-riser/hp-riser-rental-systems/