Originally Posted by
SPFDRum
Depending on if it's a traction elevator or a hydraulic.
Traction elevators use a counter weight that is figured to 40% of the combined weight of the cab and the rated capacity of the elevator. With that in mind, as you remove passengers/weight, the elevator will drift up. The easiest way to safe an elevator is to throw the main. The brake is spring set and will, barring any major failure, will hold very well.
Once you do this, leave power off.
Hydraulic elevators use an oil circuit to raise and lower the elevator. The oil is hydraulically locked between the cylinder and control valve. This type will sink if there is a leak in the system, IE vic fitting, packing, or even the valve. For added safety, once power is secured, close the shut of valve that will be located in the equipment room on the oil line.
The safest way to handle these elevators, and roped hydraulics for that matter is to manually lower them to the buffer stands. Once down, they wont move.
Having been an elevator mechanic, this is a very true statement. The frivolous lawsuits directed towards elevator companies by idiots that cant walk is staggering. So to encourage basically laymen, to perform elevator extrication is enough to make them run in fright.
Bottom line, there are true emergencies that require an immediate response, and an extrication. But in my experience, these are few and far between. It is much safer to wait out the elevator mechanic. This is what they do, day in and day out.
If you do need to, or are going to take on the responsibility to do an elevator rescue:
Call the service company
Try to cycle the disconnect and reset the elevator
Shake the last and nearest hoistway door to ensure they are shut
Try fire service
If those don't work and you continue:
Secure power-once its off, it stays off, period. We do NOT place elevators back in service
If you open a door, it's your responsibility. If it dont close and lock, making it a fall hazard, you now are on door duty until the elevator company gets there. Maybe longer if you really broke it and the mechanic needs to make a parts run.
Unless its a life or death situation, there is absolutely no need to use anything other than your standard elevator tools to open the doors. No haligans, axes, pike poles, rotary saws needed. If you are using those, quit and learn how to do it right.