The Equipment

Polystyrene foam forms are less tolerant to concrete pressures than wood or aluminum forms, which means a 2-inch diameter hose is the ideal size for placement. This lets the line pump run at full speed without danger of a form blowout.

In addition, the smaller diameter slows the flow of concrete, giving the hose operator better control of the placement. Reducers may be used on a boom pump to bring the diameter down to 2 or 3 inches, and 90-degree elbow fittings attached at the end of the hose assembly creates an "S" in the line, breaking the long fall of the concrete.

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