ISO 17455:2005 pdf download.Plastics piping systems-Multilayer pipes -Determination of the oxygen permeability of the barrier pipe.
Fo measuring the oxygen increase, two different methods are allowed: Method I and Method II. NOTE With Method I the water 5 circulated: whereas, in Method II it is stagnant
10.2 Dynamic test method (Method I) (see Figure 1)
102.1 Circulate the water c.ontrnuoualy with a volume flow of maximum 0,5 dmimin through the system without refreshment, Maintain the temperature of the water as well of the surrounding air at the specified vakies, Maintain the inside water at the specified pressure.
10.2.2 UsIng the oxygen sensor. continuously measure the total amount of the oxygen in the water.
10.2.3 After one hour, start the measurement of the oxygen concentration in the inside water.
NOTE During 5 h. the rate of change in oxygen concentratjon m the inside water constant (Stage 2 in Figure 1).
10.2.4 Repeat the procedure according to 92 before each measurement.
10.2.5 Only when three measurements in succession have values within 5 % of each other during Stage 2,
calculate the value of oxygen concentration in the inside water, F05.
10.3 Static test method (Method II) (see Figure 2)
10.3.1 After the step according to 9.22 (the water circulation has been stopped), close the valves on both sides of the test piece to isolate (make airtight) the test piece froni the closed system. To prevent a possible vacuum, first close the outlet valve and then the inlet valve.
10.3.2 Maintain the temperature of the water as well of the surrounding air at the specified values. Maintain the pressure of the Inside water at the specified pressure.
NOTE Tho Water is stagnant inside the test piece without refreslument.
10.3.3 Leave for a period of 6 h to let oxygen diffuse Into the stagnant water.
10.3.4 After 6 h, open the valves on both sides of the test piece and force the oxygen-free water (coming from the vessel) out the pipe
10.3.5 Using the oxygen sensor, measure the total amount of oxygen that issues. NOTE 1 The water conlwtg from the vessel forces out the stagnant water.
NOTE 2 When the observed concentration of oxygen is displayed as a function of time in Figure 2, the integration ci the curve shows the total amount of oxygen flowing past the sensor.
10.3.6 Repeat the procedure according to 9.2 before each measurement.
10.2 Dynamic test method (Method I) (see Figure 1)
102.1 Circulate the water c.ontrnuoualy with a volume flow of maximum 0,5 dmimin through the system without refreshment, Maintain the temperature of the water as well of the surrounding air at the specified vakies, Maintain the inside water at the specified pressure.
10.2.2 UsIng the oxygen sensor. continuously measure the total amount of the oxygen in the water.
10.2.3 After one hour, start the measurement of the oxygen concentration in the inside water.
NOTE During 5 h. the rate of change in oxygen concentratjon m the inside water constant (Stage 2 in Figure 1).
10.2.4 Repeat the procedure according to 92 before each measurement.
10.2.5 Only when three measurements in succession have values within 5 % of each other during Stage 2,
calculate the value of oxygen concentration in the inside water, F05.
10.3 Static test method (Method II) (see Figure 2)
10.3.1 After the step according to 9.22 (the water circulation has been stopped), close the valves on both sides of the test piece to isolate (make airtight) the test piece froni the closed system. To prevent a possible vacuum, first close the outlet valve and then the inlet valve.
10.3.2 Maintain the temperature of the water as well of the surrounding air at the specified values. Maintain the pressure of the Inside water at the specified pressure.
NOTE Tho Water is stagnant inside the test piece without refreslument.
10.3.3 Leave for a period of 6 h to let oxygen diffuse Into the stagnant water.
10.3.4 After 6 h, open the valves on both sides of the test piece and force the oxygen-free water (coming from the vessel) out the pipe
10.3.5 Using the oxygen sensor, measure the total amount of oxygen that issues. NOTE 1 The water conlwtg from the vessel forces out the stagnant water.
NOTE 2 When the observed concentration of oxygen is displayed as a function of time in Figure 2, the integration ci the curve shows the total amount of oxygen flowing past the sensor.
10.3.6 Repeat the procedure according to 9.2 before each measurement.
