How are floor springs classified in this standard?

They are classified into three sizes based on door mass: Size 1 (up to 80 kg), Size 2 (80 to 120 kg), and Size 3 (120 to 175 kg) as per Clause 2.1.

What is the minimum required closing efficiency for a floor spring?

The minimum closing efficiency from 90° to 0° must be 65 percent for all sizes, as specified in Table 2.

What is the endurance test requirement for a floor spring?

The spring must withstand 100,000 cycles of operation without any breakage or significant loss in performance, according to Clause 8.6.

Is the closing speed adjustable?

Yes, the closing time from 90 degrees to fully closed must be adjustable between 3 and 10 seconds, as per Clause 7.3.

IS 6315

: 1992

Floor springs (hydraulically regulated) for heavy doors

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This standard specifies requirements for the materials, dimensions, manufacture, workmanship, and performance of hydraulically regulated floor springs used for heavy doors. It classifies springs into three sizes based on door mass and outlines rigorous testing procedures, including endurance, closing efficiency, and leakage tests.

Floor springs (hydraulically regulated) for heavy doors

Quick Reference Values

Endurance Test Cycles100,000 cycles

Minimum Closing Efficiency65 %

Adjustable Closing Time (90° to 0°)3 to 10 seconds

Size 1 Door Mass CapacityUp to 80 kg

Size 2 Door Mass Capacity80 kg to 120 kg

Size 3 Door Mass Capacity120 kg to 175 kg

Hydraulic Fluid Leakage TestNo leakage after 24 hours at 45 ± 2 °C

Practical Notes

Note that this 1992 version has been superseded by IS 6315 (Part 1 & 2): 2017, which separates requirements for double-action and single-action springs respectively. The new standards should be consulted for new projects.

Selecting the correct spring size based on the actual door weight is critical. Using an undersized spring will lead to premature failure and unsafe door operation.

Proper installation and alignment of the cement box and pivot are essential for the floor spring to function as intended and meet its service life.