Tecnodue I.T.S. PT 355, Руководство по эксплуатации

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I.T.S. Ital Trade Services PT 355 Operating Manual
15
5. Welding Parameters for PE pipes & fittings DVS norm version 2207-1
Pressure-Time diagram for butt welding
t1 = Time requested for the bead formation with the specified wall thickness
t2 = Time requested for the continual heating
t3 = Time requested for the change over
t4 = Time requested for bringing up the pressure
t5 = time requested for cooling down
P1 = Pressure during the bead formation and the cooling down, this value is the result of the formula:
Pipe section( cm2 ) x Material thrust coefficient( Kg./cm2 )
____________________________________________________________ = bar
Total machine cylinders section( cm2 )
Material thrust coefficient for PE s 63 1,5 Kg./cm2
Material thrust coefficient for PP 1,0 Kg./cm2
Total PT 160 cylinders section 4,32 cm2
P2 = Pressure during the continual heating, this value either for HDPE and PP is 0,1 Kg./cm2 .
Optical checking of butt welding result