Advantage of Hydraulic Elevator
A. In terms of installers:
For low-rise buildings, installation takes less time.
The complete hydraulic system is available for installers to purchase and install at a competitive price.
Procurement of the replacement parts is easier and there is no monopoly to complicate servicing.
Hydraulic elevators consist of fewer components than traction elevators requiring less servicing.
Risk of accidents during installation is less with the use of safe machine room at the basement or at the first floor.
Hydraulic elevators with motor-pump drives are submersed in lubricating oil operate smoothly with minimum wear. Servicing intervals between repairs are longer than with traction type elevators.
Most effective for high load capacity requirements.
The load is carried by the foundations of the building and not by the less stable structure of the elevator shaft, a major factor in earthquake endangered areas.
Noise in the shaft is reduced with the existence of the machine room.
They are less sensitive to fire sprinklers and fire hoses in the hoistway.
Down speed can be increased at no cost since the motive power for the down travel comes from gravity. This feature can provide faster passenger service.
B. In terms of customers:
① Substantially lower initial cost of equipment and its maintenance: It is generally estimated that for elevators of comparable specifications, the initial investment is from 15 to 25% less than for traction installations. A further economy is realized in the maintenance cost of the hydraulic elevator.
② More effective building space utilization:
- The hydraulic elevator uses about 12% less hoistway area than the traction unit since the extra room for the counterweight is not required for hydraulic units.
- Since the hydraulic elevator imposes no vertical loads on the building structure, column sizes can be reduced significantly in the hoist area.
- Machine room location can be very flexible.
- It can be easily applied to the buildings without a shaft.
- It is suitable for installing in old buildings, where structural reinforcements to support the overhead loads imposed by traction elevator equipment would be costly and impractical.
- Hydraulic elevators are well suited for installations where future floors may be added to the building.
③ High reliability on failure free operation.
④ Involves no experts for rescue operations. Most emergency measures can be taken without entering the shaft or climbing to the top floor. Elevator controls can be adjusted without working in the shaft.
⑤ Considering the savings in fuel through fewer service calls required by hydraulic elevators, the total energy requirements of hydraulic and traction elevators are similar. The limited amount of heat generated by the hydraulic power unit during down travel can serve to temper the lower temperature in the basement of buildings, in which case there is potentially no waste of energy.