Hydraulic elevator maintenance - cold temperatures

We have been having a warm winter until the last few days which have been more of a typical Chicago winter.  This is a reminder to building owners to keep your machine rooms warm to avoid any head aches from cold weather.  This is a repost from last year when we had extreme cold temperatures for a prolonged period of time.

 We have been visiting the same customers in the morning the last few days that indicate their elevator “does not work”.  When we get to the building we discovered the elevator room is ice cold and the hydraulic oil needs to be heated up.  We typically have the same conversations with building ownership about keeping their machine rooms warm.

The temperatures that hydraulic elevators fluid should be is 

Operating temperature  - 80 to 150 degrees Fahrenheit 

Operating temperature  - 100 to 130 degrees Fahrenheit 

Source - Maxton Valve[www.maxtonvalve.com] - Maxton valve is one of the largest valve suppliers in North America.

Oil composition when it gets cold – When hydraulic elevator fluid gets cold it becomes thicker or has a higher viscosity.  

Viscosity definition - The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stressor tensile stress. For liquids, it corresponds to the informal concept of "thickness". For example, honey has a much higher viscosity than water.

How does this translate to your elevator – In our Chicago area environment we use a certain hydraulic fluid that offers more flexibility between hot and cold environment because of our seasons in the Chicago area.  Due to significant swings in temperature in our environment when it is very cold the oil gets thicker and the valve and elevator system will not operate correctly causing a potential issue with leveling or entrapment.  The reverse occurs when it gets very hot and the oil gets very hot.  Both scenarios cause safety issues for the elevator riders.  If we always had cold or warm temperatures we could use a different hydraulic fluid that would be more appropriate for a hot or cold environment.  But! We live in Chicago.

What not to do – As a building owner it is very important to have your elevator running.  Some building owners take it upon themselves to improvise to get their elevators running on cold days with space heaters.  While the installation of space heaters is a short term solution, it isn't a safe long term solution as you will see space heaters in non-occupied machinery spaces that can malfunction causing smoke and fire hazard.  The space heaters also can overload your electrical circuits causing your breakers to trip.  The electricity costs to run multiple heaters in one year would probably be significantly more than the installation of a elevator tank heater.

[Space heater on the valve]

[Space heaters on the valve and oil tank]

                                              [Space heater in the elevator pit]

Recommended solution – Install a tank heater to be turned on during the winter months.  This is a safe alternative to what you see above.

[www.nylube.com]

Hydraulic tank heater[can cost $500.00 to $1,000.00] - The heating element goes into the hydraulic tank and will maintain an constant temperature.  There will need to be a 110vac outlet available adjacent to the elevator machine to plug into.

Take away - If your elevator machine room is 30 degrees on cold days, your elevator will not work properly.  If you cannot safely heat the elevator machine area to an appropriate temperature contact your elevator maintenance company to give you a price on a tank heater.

If you have an questions or would like information from Colley Elevator you can go to www.colleyelevator.com, email Craigz@colleyelevator.com or call 630-766-7230.