Patent ID: 9726306
Date: 2017-08-08
CPC Classifications: B32B,F16L,Y10T

Claim:
1. A flexible pipe comprising: an inner liner formed as a tube and having an outer surface defining an outer diameter of 5 to 24 inches and an inner surface defining an inner diameter, the inner liner formed of a material including a thermoplastic material; a reinforcement layer of reinforcing tape bonded by melt fusion to the inner liner, the reinforcing tape with a thickness of 0.6 to 1.5 mm and a width of 25 to 40% of the outer diameter and including 50-70% glass fiber reinforcements by weight in a matrix composition, the matrix composition including high density polyethylene (HDPE); 8% to 20% by weight of maleic anhydride grafted polyethylene; 3 to 13% by weight of styrene ethylene butylene styrene polymer; and 10 to 30% by weight of a medium density polyethylene and the reinforcement layer, all % weights being by weight of the high density polyethylene, including at least a first ply of the reinforcing tape helically wrapped in a first helical direction about the inner liner and a second ply of the reinforcing tape helically wrapped about, and bonded by melt fusion to, the first ply of the reinforcing tape, the second ply of the reinforcing tape helically wrapped in a second helical direction opposite to the first helical direction; and an outer jacket applied over and bonded by melt fusion to the reinforcement layer, the outer jacket including a thermoplastic.