Tag Archives: PME

Freight Vs. Passenger – The Difference is more than Size

The differences between freight and passenger elevators are as simple as the definitions of each that you can find in the American Society of Mechanical Engineers (ASME) – Code for Elevators and Escalators. Unfortunately, just like most code books, the definition doesn’t really reveal much. For instance the freight elevator is defined as, and I quote:

“An elevator used primarily for carrying freight” (no kidding) “and on which only the operator and the persons necessary for unloading and loading the freight are permitted to ride.”

The code does go on to indicate there are three different classes of freight elevator– general, motor vehicle, and truck loading–but beyond that there is little that legally distinguishes freight from passenger. This is confirmed by the definition of a passenger elevator. It is defined in the same publication as:

“An elevator used primarily to carry persons” (again, no kidding) “other than the operator and persons necessary for loading and unloading.”

Well that was the shortest blog post ever right? Now we all know the differences.

It’s, sadly, not entirely that easy, because beyond the code and just hanging a sign that says it is a freight elevator, there are accepted features of a freight that make it very different, when talking to a person in the elevator industry.

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Photo courtesy Fred Small – http://www.elevatorbobs-elevator-pics.com

The first thing you notice about freight elevators is that the doors usually open from the middle with the opening being horizontal not vertical. This is not a requirement by any law and some vertical parting doors are in operation for freight elevators (usually hinged).  Some are even on the market today, but usually one of the factors that separate passenger and freight is the way the doors work: up and down (instead of left and right). The reason they are designed this way is because the opening for entry to the car is to cover the entire width of the car itself to get things in and out easier. However that is only part of the reason. Doors opening up and down also saves space. If the doors moved to the left and right, instead of up and down, the hoistway would have to be extremely wide to accommodate doors big enough for the actual freight being carried. So, the hatch doors opening up and down is to save space in the hoistway and, as a result, it saves space in the interior of the building, as well.

Another feature is that quite often the doors are manually operated, especially for older models, with a gate closing the exit or exits of the elevator car. As a safety feature, the elevator will not run until the gate and doors are fully closed, even if they are manually operated.  Wooden gates were popular at one time and many are still in use, however, there are currently stronger, heavy duty metal gates that are more often installed.

Freight Elevator they are different than passenger elevators.
Photo courtesy Pierre Tremble – http://www.elevatorbobs-elevator-pics.com

Also, doors don’t have to be muscled open and closed when using automatic, instead of manual doors. They can be operated with the touch of a button, if desired. To make the gate easy to use, they are often counter-weighted and they can be manually raised and lowered or can be controlled with pressing a button, as well.

Not to confuse matters, but it’s important to keep in mind that freight elevators can also have rather standard looking doors too, with them all operating like a regular passenger elevator, just heavier duty.

Another feature that you would notice right away is that the freight elevator does not, in most cases, have a dark, but warm, hand rubbed walnut finish with gold inlays and mirrors in the interior of the car. The cars are built to be utilitarian with 14 gauge or better steel wall panels and a heavy reinforced gate. The floor is also made for heavy, and I mean heavy, traffic. It is usually a no skid steel floor on a steel car platform. Sometimes the heavy steel floor is covered in a rubber, non-slip surface. All of these features are to make the elevator as durable, and safe, as possible.

In the freight elevator car, unlike passenger elevators, the rails you find are strategically placed to take the brunt of the damage from carts or loads being moved by hand trucks or fork lifts. This saves the car a lot of damage. Also, the rails are designed to be easily changed when damage does occur.

Just as the definition according to the ASME code book is ambiguous, at best, so is what can be called a freight elevator. Almost any type of elevator can qualify as a freight elevator because the uses can be so varied depending on the need. But when it comes to describing the standard freight elevator, look for the doors and the width of the opening first, as it is usually a dead give away whether or not it’s freight.

 

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A view from under the elevator car of an in-ground jack.

All About Elevator Jacks

A view from under the elevator car of an in-ground jack.
A view from under the elevator car of an in-ground jack with the piston extended.

When it comes to many elevator applications, especially for buildings between 2 and 5 stories, you will find a hydraulic jack is a common, yet crucial part of the system that drives the elevator up. As a matter of fact, approximately 70% of all elevators installed are hydraulic in nature and contain jacks.  The jacks are part of a system that includes hydraulic fluid, tanks, motors, and pumps with the jack being the final piece of the system.  So, understanding the basics of the elevator jack is crucial if you are considering buying a new elevator or modernizing the jacks in an existing elevator.

Depending on the system you have, the distance your elevator travels, and the space available, you have several options available. This article will explain the various types of jacks and the advantages and disadvantages associated with each.

  • Single Stage Holeless – Many times when new elevators are being placed, you can’t drill a hole in the bottom of the elevator pit or it is cost prohibitive to do so. Enter the holeless elevator jack. The most common jack used for short travel distances is the single-stage variety. A single stage means that it is one piston that goes up and down and it does not telescope when it reaches a certain height. These can be used for passenger or freight elevators.

The benefits of this type of jack (often called a twin-jack and used in tandem on either side of the elevator car) is that they are lighter and easier to put into place, are the most economical choice, and can be designed to carry very heavy loads. On the downside, because you are often dealing with two jacks, more adjustments must be made and it takes a bit more maintenance. Also, because the jacks commonly go on either side of the car, and there is no hole for the jacks to retreat in, there must be more space at the top of the hoistway above the car.

  • Single Stage In-Ground – This option is very common, especially when you can drill a hole in the bottom of the pit and want to travel multiple floors.  Because it does not telescope, the moving parts are limited and it is, therefore, reliable. It has also been around for a very long time as a solution and has a solid track record.

The good things about a single stage in-ground jack is that it is easy to install, fairly economical, especially for mid-rise projects, has a huge capacity, and maintenance is limited to one jack.   They also provide a very smooth ride. On the downside, the jack is in a hole. This can lead to leaks of hydraulic fluid into the underground water supply or contamination of the soil. Keep in mind that most of the contamination issues have been resolved with new technology and regulations. However, the threat remains: units can have a cracked PVC casing which can cause flooding of the pit and some fluid leakage. Also, old corroded sheaths that the jacks reside in need to be replaced, usually at a significant cost.   Also, the depth of the jack must be equal to the travel of the elevator car. This can mean an expensive, deep hole.

  • Telescopic Jacks (Holeless and In-Ground) – Telescopic jacks can have up to four pistons, each traveling inside each other. These are used when a more compact solution is needed for either freight or passenger elevators. Telescopic jacks going in-ground will reduce the depth of the hole required, but can sometimes be more costly in and of themselves.

The big plus is that there is a reduced drilling cost for an in-ground application and a higher travel distance than for holeless projects.  Also, the installation is usually fast as the jacks are compact and easy to handle. The disadvantages include the obvious; there are more moving parts, so initial set up may be more complicated (bleeding the jack completely, is required). Depending on overall travel distance, follower guides will be needed, requiring additional engineering. Long-term maintenance may be more costly, as well. Finally, there are simply more packing and seals due to multiple pistons.

Jack Travel-01

Each of the above jacks have their place and purpose depending on travel distance, but, as you can see in the chart, there is overlap based solely the height the elevator needs to go to. Other factors include price, the ability to drill, and even personal preference (some feel the ride is better in elevators that have an in-ground jack).

The best way to determine the optimal option for your building project is to contact an elevator consultant or an unbiased company that can provide any type of elevator.  They should welcome all your questions and be willing to break down all possibilities by price or other factors important to your project. If you would like to talk with us about elevator jacks, visit us here.

Elevator Contracts – Shop All Exclusions

raquel-martinez-96648For some, shopping is about more than finding bargains, it is an obsession. They can’t quit comparing apples to apples and finding success in each penny saved. This is despite the fact that quite often going to store after store means burning more gas and time than actual savings generated.  Of course, the more costly the item, the more justification there is for doing a thorough job of looking around and comparing products.

When it comes to elevators, it seems like everything is expensive, especially when it comes to repairs that are outside of the warranty or maintenance contract. People feel trapped by the contract and elevator company, so, often the work is approved without considering other options. But shopping around can help lessen the overall cost of elevator ownership.

If, like most buildings owners, you have a standard oil and grease agreement, you may find that there is lots of (necessary) stuff left outside of the contract or that has been excluded.  For instance, service calls and parts are usually specifically not covered, and good luck getting any major repair to fall under the current maintenance agreement you have. Even full service agreements have their limits. Usually, for repairs outside of the agreement, you will be required to get a quote for the work contractually excluded and only after approval will the work begin. What your current provider may have failed to tell you is that in most circumstances you can ask a different elevator company for bids as well. You get to do some shopping.

Keep in mind, exclusions are reasonable in most cases; owners are just unaware of them until the elevator needs work that is outside of the contract. Here are some of the more common exclusions you need to keep in mind:

  • Vandalism or elevator misuse – This is not just graffiti in the elevator car but any intentional act that hurts the operation or aesthetic appeal of the elevator. An elevator door that has been hit one too many times with a cart can be an example. It is excluded because vandalism is difficult to predict and there’s no way to get a firm handle on the costs until after there’s a problem.
  • Obsolete parts – most elevator contractors and contracts charge a premium for the difference between the normal purchase cost of a regularly available part and the cost to custom manufacture it or find someone that will. Oftentimes, when you start hearing “modernization” mentioned by your technician, it is because parts are getting hard to find.
  • Modernization – It is rarely covered in most elevator contracts. Modernization is excluded because it is a major update to systems and can be quite costly. A modernization really requires a second opinion and an estimate.
  • Proprietary Parts – Proprietary parts are not always excluded directly, but having access to parts and tools that are limited to a specific company makes getting a different company to work on your elevator or bid for work extremely difficult. Never purchase an elevator with proprietary parts and/or control systems. Doing so will severely limit your options for choosing a maintenance service provider.
  • Damaged underground pipes (for hydraulic elevators) – Corrosion can cause real headaches, especially regarding old elevators. Fixing corrosion, otherwise known as replacing pipes, can be a huge cost and is excluded in most contracts.
  • Items outside of the control or scope of the elevator contractor – This can mean a lot of things including, but not limited to, major things like power surges, power failures, or lightening strikes or minor problems caused by debris in door tracks that are preventing doors from functioning. Sometimes, even keys left in the wrong position can generate a service call and can e excluded by maintenance contracts. We have all heard of the $1000 light bulb. If light bulbs are not covered in the service agreement, they can indeed cost you a precious amount.

Especially when it comes to modernization and pipe replacement it is more than just a simple apples to apples comparison for pennies on the dollar. These are very expensive jobs and multiple bids need to be obtained. Extensive upgrades to the elevator cab should be open for multiple bids, as well. Remember, almost any elevator tech can work on any other elevator regardless of the brand (only proprietary parts can be an issue). So, do some shopping and see what others have to offer.  The difference could be thousands of dollars.

If you are in Illinois, we can offer more specific information and estimates. Visit us here.

Elevator U Report: Maintenance – It’s Just Business

Recently, I sat in on a great discussion at Elevator U regarding elevator maintenance. Elevator U is an organization that has an annual gathering of elevator pe

Elevator U Final

rsonnel from colleges and universities around the country. The conference is a great opportunity to meet and greet some great folks in the elevator business and to learn a lot of valuable information through taking part in the various seminars and breakout sessions about the industry. One of the speakers this year was Dr. Clemense Ehoff, an accounting professor at Central Washington University. He is a published writer on information specific to the elevator industry, especially elevator maintenance.

During his presentation, Ehoff made a couple of important points about the vertical transportation industry that ought to be paid special attention by those that own buildings with elevators…Click for the whole report.

Elevator U: The Myth of Maintenance Teamwork

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Photo by Pierre-Etienne Vachon on Unsplash

Long-term planning for elevator maintenance takes cooperation from several parties and often is equated to teamwork. However, the idea that a team is always the solution to the problem often misses the bigger point. At the recent Elevator U conference we learned a lot about the various people that make elevator maintenance systems work but, surprisingly, the word team was never mentioned.

This is may be because when you hear the word “team,” you think of a group of individuals all dressed in the same uniform striving for victory, all pulling in the same direction. Even though everyone’s in-game goals may be different, victory for the team is always the objective, so they cast self-wants aside for the win.

Baseball is a great example of this.  See how elevators equates to baseball by clicking here.