Project Description

The Constant Effort Support

The Constant Effort Support is based on the established principle of a compression spring working in conjunction with a bell crank lever, achieving a mathematically perfect counterbalancing of spring and load moments about the central pivot point resulting in a constant supporting effort throughout its total travel.

With a fixed spring housing of robust construction, the unit can be installed in various configurations. In addition, the spring housing prevents the ingress of foreign bodies such as construction debris, thus reducing the danger of damage or restriction of the unit’s function.

Constant Effort Supports are constructed to accommodate loads between 10 Kg and 33,515Kg with a standard range of 40 mm to 610 mm in 10 mm increments.

CONSTANT LOAD SPRING SUPPORTS

The Constant Load Spring Supports (Constant Supports) provide a constant supporting force through the total travel of the support. Together with the compression spring working in conjunction with a bell crank lever, the simplified construction achieves a mathematically perfect counter-balancing of spring and load moments about the central pivot point.

Constant Load Spring Supports are typically used when large vertical movements are present in critical piping to avoid residual stresses to other process piping systems.

The spring housing itself prevents the ingress of foreign bodies such as construction debris, thus reducing the danger of damage or restriction of the unit’s function.

To produce a Constant Supporting Force, the load moment about the Main Pivot must be counter-balanced by an equal spring moment throughout the travel range.

STANDARD RANGE

Constant Supports are constructed to accommodate loads between 12 kg and 45700 kg with a standard range of travels from 40mm to 410mm in 10mm increments.

Constant Supports are manufactured having a deviation of ±5 percent of the specified load. Upper and lower travel stops are incorporated in all units to prevent excessive overtravel. In addition, all supports are fitted with a clearly visible travel scale.

SPECIAL RANGE

We can manufacture Special Constant Supports designed to suit customer’s specific requirements, i.e., higher loads, travels, and configurations other than those indicated in the standard range.

LOAD ADJUSTMENT

Although the supports are preset to the customer’s specified load and travel, it is sometimes necessary to adjust this preset load to accommodate minor variations in actual site conditions.  A simple operation of turning the load adjuster screw in the appropriate direction to increase or decrease the load is all that is necessary.  The adjustment amount is shown on the adjacent scale calibrated in 2 percent divisions, the maximum adjustment being ±20 percent of the mean load.

PRESETTING

All Constant Supports are fitted with preset pins, which are painted red. These pins are factory positioned within the unit to suit the customer’s specified installation condition. Upon completion of installation and before removing the pins, the pipework system can be hydrostatically tested or acid cleaned without further deflection of the spring assembly. The preset pins must be removed before commissioning the system (refer to installation instructions).

Our standard presetting pins will enable loads of up to twice the capacity of the support to be taken during the hydraulic testing period.

Should it be necessary to carry loads over this, we must be notified to ensure the supports are designed with adequate safety margins.

STANDARD TYPES
CalsFormula
Constant Pipe Support