**SDR 26**

**How to read the charts:**

**1**. Choose the particular chart for the material designation (PE 100, PE 80, PE 63) and pressure class (PN 16, PN 10 etc.) of pipe being used.

**2.** In one of the first 3 columns find the nearest value of the quantity of water to be pumped. The three columns give the quantity of water in different units.

GPH = Gallons per hour,

m³/hr = cubic metres per hour,

l/s = litres per second.

**3.** Run your eye along the horizontal line found in instruction 2 above until you get to numbers which are shaded light green. The number in the shaded block is the

friction loss (expressed in metres per 100 metres) for the size of pipe given at the top of the particular column.

**4.** The reverse sequence can be used to determine the amount of water that can be put through a given pipe size (and how much friction loss is created).

**Notes:**

1. The colour coding represents the approximate velocity of the water in the size of pipe chosen.

2. If two or more size columns have the same colouring then there is a choice of suitable sizes each with its own friction loss value.

3. The range of velocities (metres per second) represented by the colours is as follows:

**SDR 17**

**How to read the charts:**

**1.** Choose the particular chart for the material designation (PE 100, PE 80, PE 63) and pressure class (PN 16, PN 10 etc.) of pipe being used.

**2.** In one of the first 3 columns find the nearest value of the quantity of water to be pumped. The three columns give the quantity of water in different units.

GPH = Gallons per hour,

m³/hr = cubic metres per hour,

l/s = litres per second.

**3.** Run your eye along the horizontal line found in instruction 2 above until you get to numbers which are shaded light green. The number in the shaded block is the

friction loss (expressed in metres per 100 metres) for the size of pipe given at the top of the particular column.

**4.** The reverse sequence can be used to determine the amount of water that can be put through a given pipe size (and how much friction loss is created).

**Notes**:

**1**. The colour coding represents the approximate velocity of the

water in the size of pipe chosen.

**2**. If two or more size columns have the same colouring then there

is a choice of suitable sizes each with its own friction loss value.

**3**. The range of velocities (metres per second) represented by the

colours is as follows:

**SDR 11**

**How to read the charts:**

**1**. Choose the particular chart for the material designation (PE 100, PE 80, PE 63) and pressure class (PN 16, PN 10 etc.) of pipe being used.

**2**. In one of the first 3 columns find the nearest value of the quantity of water to be pumped. The three columns give the quantity of water in different units.

GPH = Gallons per hour,

m³/hr = cubic metres per hour,

l/s = litres per second.

**3**. Run your eye along the horizontal line found in instruction 2 above until you get to numbers which are shaded light green. The number in the shaded block is the

friction loss (expressed in metres per 100 metres) for the size of pipe given at the top of the particular column.

**4**. The reverse sequence can be used to determine the amount of water that can be put through a given pipe size (and how much friction loss is created).

**Notes**:

**1**. The colour coding represents the approximate velocity of the

water in the size of pipe chosen.

**2**. If two or more size columns have the same colouring then there

is a choice of suitable sizes each with its own friction loss value.

**3**. The range of velocities (metres per second) represented by the

colours is as follows:

**SDR 7.4**

**How to read the charts:**

**1**. Choose the particular chart for the material designation (PE 100, PE 80, PE 63) and pressure class (PN 16, PN 10 etc.) of pipe being used.

**2**. In one of the first 3 columns find the nearest value of the quantity of water to be pumped. The three columns give the quantity of water in different units.

GPH = Gallons per hour,

m³/hr = cubic metres per hour,

l/s = litres per second.

**3**. Run your eye along the horizontal line found in instruction 2 above until you get to numbers which are shaded light green. The number in the shaded block is the

friction loss (expressed in metres per 100 metres) for the size of pipe given at the top of the particular column.

**4**. The reverse sequence can be used to determine the amount of water that can be put through a given pipe size (and how much friction loss is created).

**Pressure Considerations**

**Static**

**Dynamic**

The pressure classes of SABS ISO 4427 HDPE pipes are based on constant internal water pressures. HDPE pipes are however capable of handling dynamic pressure events which exceed the values given by the classes but such occurrences can have a negative effect on the standard 50 year life expectancy and in extreme cases can result in product failure.

Pressure de-rating factors should be applied to HDPE pipes when operating temperatures rise above 20°C. The de-rating factors below are applicable to HDPE.

At lower temperatures, between 20 °C and 0 °C, the pressure handling capability does increase but it is recommended that this be ignored. In the unlikely event of water freezing inside an HDPE pipe damage is unlikely to occur. Nonetheless it is recommended that the pipeline system be protected against freezing to obviate flow restrictions.