How To? Learn anything step by step!

Posts Tagged ‘Construction and Maintenance’

Door closer is a mechanical device installed to close the door after someone opens it or it is opened automatically. There should be correct proportion between the size of door, door closer and number of people using that door or the frequency of opening the door every day. Select the best-suited design to have proper result.

There are basically two types of door closers. Depending on what you need, you can pick them. These can be concealed either in frame or in floor or surface mounted. The closers that are surface mounted can be categorized into four types: Regular arm, Top Jamb Mounted, Slide Track Arm and the Parallel Arm. When we talk about the overhead closers, they are generally surface mounted. Surface mounted closers are those which come with a small boxes attached on the top corner’s of door.

Door closers can be divided in two types depending on the traffic they can manage. Type 1 has been designed for main entrances and high traffic areas. It can endure a use of about 400 times a day and requires a replacement after 3 to 7 years. It even has multiple control modes like sweep, latch and back check.

Type 2 closers are designed for interior doors of an office area which have a medium traffic and are used about hundred times a day. These closers have two valves which control the speed of the door. The first part of closing cycle takes about 5 sec giving enough time for the person to move without having any chance of being struck by the door in this closing cycle. The ideal time of quick and safe door closing cycle is kept to about six seconds.

The back check is the third control which helps the door to open in a constant speed without hitting the stopper or the wall. You have the facility to set the speed in such a way that the door slows down before it is fully opened.

Also heavy wind blowing during the temperature changes slams the door and the windows and if you have a closer installed you can avoid the damages from happening. From fire safety point of view closers on fire doors prevents the fire from spreading and escaping further.

Using these closures on fire doors is also very common. They are closed at the time of fire so that spreading of fire is prevented. Besides the closure facility during fire situation, other things that should be kept in mind are health, safety, durability, etc.

It could entail a lot of effort to open and close doors so why not settle for door closers. This keep your doors safe and secure especially if you own establishments that require one. Or you may want to try electric strikes.

Means of protecting electrical systems, buildings, and other property from lightning and other high-voltage surges. Lightning protection systems have changed extensively with the passage of time. New appliances, electronic and all varieties of home and different building construction equipments ought to be protected from lightning. Lightning will hit anywhere in the world. Every year lots of homes and other buildings are destroyed by the lightning. Lightning damages more property and causes death than any other disasters yearly.

A lightning protector provides a shield against lightning. Lightning surge protection will not stop lightning to strike however it will defend the equipment from destruction. On the other side a lightning surge protector may be a device that protects electronic devices from surge in electrical power. Surge protectors are commonly referred to as power strips, surge suppressors and transient suppressors.

120 volts are a standard voltage for homes and different buildings in most of the countries including United State of America. Voltage over this standard will cause injury to the equipments. A surge protector channels the over voltage into the wires of outlet that forestall the extra flow of voltage through the devices and let the traditional voltage to flow in its.

Conceptually, lightning surge protection devices are switches to earth. Once a threatening surge is detected, a lightning protection equipment grounds the incoming signal affiliation point of the equipment being protected. Therefore, redirecting the threatening surge on a path-of-least resistance (impedance) to ground where it is absorbed.

The essential components used as protective switches are: gas tubes, metal oxide varistors and silicon avalanche diodes (transorbs). Every has sure benefits and disadvantages.

From studies of lightning, there are 2 conclusions: (1) Lightning is not going to strike an object if it is placed in a grounded metal cage. (2) Lightning tends to strike, normally, the highest objects on the horizon.

The possibility that a thing will be struck by lightning is smaller if it is located in a valley. So, electric transmission lines which must cross mountain ranges often will be routed through the gaps to avoid the direct exposure of the ridges.

There are a number of protective devices to limit or prevent lightning harm to electric power systems and equipment. The word protecting is used to denote either one of 2 functions: the prevention of hassle or its elimination when it occurs. Different protecting means have been taken either to prevent lightning from coming into the system or to attenuate it’s harmlessly if it does. Overhead ground wires and lightning rods are used to stop lightning from striking the electrical system. Lightning arresters are protecting devices for reducing the transient system over voltages to levels compatible with the terminal-apparatus insulation.

Underwriters Laboratories Inc. (UL) has been working within the lightning protection field for the last a hundred years. Their expertise in the protection testing field has gain recognition worldwide. UL Mark on product and systems is that the mark of level for safety. Underwriters’ laboratories Inc. is working in the area of factory testing and inspection of the system parts and the field inspection components of completed installation.

Global Lightning Technologies (M) Sdn. Bhd. has its origin that dates back to 1986, when Lightning Protection division of DOM Industries (M) Sdn. Bhd. was first set-up. As a result of strong growth and an increasing demand in this sector it was decided that this division of DOM Industries become a separate entity to focus primarily on Lightning Protection Systems.