What type of buffer is needed for a lift with a speed of 1.5 m/s?

Only an energy dissipation (hydraulic) type buffer is permitted. Energy accumulation types are limited to speeds of 1.0 m/s or less (Clause 4.1).

What is the maximum allowed deceleration for a hydraulic buffer?

The average retardation over the stopping distance must not exceed 1 gn (9.81 m/s²). Short peaks up to 2.5 gn are permissible if they last less than 0.04 seconds (Clause 5.5).

What information should be marked on a lift buffer?

The buffer must be permanently marked with the manufacturer's name, type approval certificate number, and the permissible range of masses and impact speeds (Clause 9).

When are reduced stroke buffers allowed?

Reduced stroke buffers may be used for rated speeds above 1.0 m/s only if the installation is equipped with a pre-triggered safety system that reduces the car's speed before it strikes the buffer (Clause 5.6).

IS 14667

: 1999

Buffers for Lifts

CurrentSpecializedSpecificationBIMMEP · Lifts, Escalators and Mechanical Handling

Download PDF BIS Portal Google

This standard specifies the requirements for the design, construction, and testing of buffers used in electric and hydraulic lifts. It covers two main types: energy accumulation buffers (e.g., spring type) for lower speeds and energy dissipation buffers (hydraulic) for all speeds, ensuring safety during an over-travel incident.

Specifies the requirements for energy accumulation type and energy dissipation type buffers used in lifts.

Quick Reference Values

Max rated speed for energy accumulation buffers1.0 m/s

Max rated speed for non-linear accumulation buffers1.6 m/s

Max average retardation for energy dissipation buffers1.0 gn

Max peak retardation (>0.04s) for energy dissipation buffers2.5 gn

Min factor of safety for buffer springs4.0

Practical Notes

Energy accumulation (spring) buffers are only permitted for lifts with rated speeds up to 1.0 m/s. For any higher speed, energy dissipation (hydraulic) buffers are mandatory.

The required buffer stroke, which is dependent on lift speed, is a critical factor in determining the lift pit depth during the architectural design stage.

Regular inspection of hydraulic buffers is critical to check for correct oil levels and leaks, as low oil can lead to failure during an impact.