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For many building managers, "green" is a major objective. It's not only socially responsible but, in many cases, is also efficient. What many may not know is that the bollards, barriers and barricades used to protect buildings from car bombers or errant drivers can also be green. And, unlike many green alternatives, there are a variety of ways to create green vehicle access control systems.
Typically kept in an upright position to stop vehicles from entering, bollards, barriers, and barricades drop into the ground to let vehicles in, once the car or truck has passed the unit is again raised. There are a wide variety of bollard, barriers and barricades, one available for almost any type of application. Upon selecting the model of vehicle access control, the next decision is to decide what type of controller to use, hydraulic or electro-mechanical. This is where "green" enters the discussion.
Hydraulic or Electro-Mechanical Controller? It's Not a Cut and Dried Answer
Attached to the actual barrier, a hydraulic controller attaches via underground hoses or steel pipes from a remote location, powered by a single or three-phase power source. While the hydraulic carriers are buried, the motor remains above ground, alleviating the problems of mud and water. Hydraulic controllers will produce between 20,000 and 25,000 pounds of force, making them more powerful than electro-mechanical units.
The biggest environmental complaint about hydraulic controllers is that they typically use petroleum-based oil to produce system pressure. What most operators don't realize is that they can also use biodegradable oils, usually derived from FDA-approved vegetable oils. Over 50 different types of bollards, barriers and barricades can be run with oil that was formerly used to cook your French fries.
Some locations won't allow you to use oil, no matter where it comes from. In such locations, as well as others, building managers select electro-mechanical controllers. Such controllers are also perfect for locations and applications that need a less-complex solution. These controllers let you decide how quickly you can raise the ramp or bollard. For instance, many users like to initially raise the ramp or bollard quickly and slow down near the end, which is easier on the system. Additionally, electro-mechanical units are quieter than hydraulic options, which can be a concern near residences.
Typically, the motor is buried. So, in environments where there can be much water or mud, the electro-mechanical controller can produce bigger maintenance issues than hydraulic units. However, this can be offset when the contractor creates a good drainage design at the time of installation by not mounting the barrier in an area subject to flooding and assuring that the roadway is crowned to prevent standing water.
Electro-mechanical controllers usually operate with a minimum 220v single phase power and draw approximately 20 amps, typically 12-15 amps of power more than what the hydraulic power units draw, which can bolster arguments of whether or not the hydraulic units might actually be "greener" than electro-mechanical units. That will be for you to decide.
Bottom line - If you need your vehicle access control system to be green, that's not a problem. There are a variety of ways to meet your goal.
Greg Hamm is Vice President - Sales and Marketing for Delta Scientific. He can be reached at email@example.com.
Choosing a door closer changes depending on many different factors including customer preference, manufacturer options, and building specifications. Other factors to consider include:
Traffic Volume Considerations
In general, overhead door closers are used typically for medium- to heavy-traffic locations, and they are extremely durable. There are options for interior or exterior doors, and they’re one of the most common types that are used.
Floor-spring or overhead spring closers, on the other hand, are a bit more durable, and they work nicely for heavy traffic doors. Additionally, they are not visible like overhead closers, making them one of the most attractive options. Finally, concealed and frame-mounted closers are typically used for medium traffic, interior doors.
Deciding on a door closer depends on a variety of factors. It starts with understanding the various types, and the benefits that they have to offer. Then, matching the door to the type of door closer that you’re using is the key. Heavier doors and doors with higher traffic require durable, strong door closers. Lighter doors do not. Either way, if you’re unsure, the best option might be to consult with a door installer or vendor.
Building Code Considerations
Each area can have slightly different building codes depending on the location of the building. Federal, state, and even local building codes can have an impact on determining the door closer required. The Builders Hardware Manufacturers Association (BHMA) and American National Standards Institute (ANSI) provide extensive standards for door closers. The full list can be found here. Generally, each door closer needs to meet different levels of performance broken up in 3 grades with 1 being the highest and 3 being the basic level. Performance is judged based on cycle testing as well as closing force and finish tests. The tests are done in a neutral air pressure laboratory at 60-85 degrees F.
Door closers have the following requirements:
If doors are being installed into a high volume area like a major office building or shopping mall, it is crucial to only use door closers that have been rated as Grade 1 closers.
The American Disability Act also provides a list of clear requirements when looking at doors and door closers. The ADA states that interior doors should require no more than 5 lbs of force to operate and exterior doors should have the minimum force possible. The ADA also states that the closing or swing speed shall not be faster than 5 seconds and the latching speed should be quick enough to latch the door, but not slam it.
A door closer might be chosen for its appearance, as some are more attractive than others. The majority of door closer units are adjustable, allowing operators to set a specific closing rate and opening resistance. Types of door closers include:
Overhead Door Closers
Overhead door closers are the most common, and they’re widely used throughout commercial properties. For example, interior doors within offices, like conference doors, are typically affixed with a door closer that automatically closes the door. Additionally, commercial front doors are also installed with a closer unit, and overhead units are a popular choice. There are three common types of overhead door closers including:
Other Types of Door Closers
Although overhead closers are the most common, there are other types that aren’t mounted at the top of the door. Concealed closers, for example, are hidden within the jamb, offering a more appealing look. Similarly, floor closers are concealed within the floor and they aren’t visible when the door is opened. Examples include:
Making the Right Choice
As a building manager or owner, all this can be overwhelming. It’s essential to first consider building codes and traffic requirements before looking at the different aesthetic options. The wrong type can lead to the closer needing replacement in a short-period of time and also could lead to fines. As mentioned earlier, it’s essential to choose ANSI Grade 1 closers for high volume doors. If you have a small interior office, Grade 2 door closers are acceptable and for closets, Grade 3 closers will work fine.
Once the grade requirement is met, energy efficiency and aesthetics can be taken into account. Exterior facing doors that will not be used for shipments could be left open far longer than needed leading to larger energy bills. Conversely, doors that automatically close too quickly that are used for shipments could lead to a productivity decline and later a demand that a different closer be used. The application of each door will change the type of closer needed. One way to mitigate this potential problem would be to discuss the needs of each door with someone who would be working in the area.
Matthew Davis is an associate of Aeroseal Windows & Storefront, a commercial windows and doors installer.
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