Security fences

Move as quickly as possible with the most obvious and cost-effective physical improvements, such as perimeter fences, security lighting, tamper-proof manhole covers and valve boxes, etc. 

To edge quartersawn boards, first measure for desired board width (4). Then, for a fence, position a dressed guide plank the distance of that measurement away from the sawbar. Measure from the inside edge of a chain cutter on both sides of the bar to make sure the fence is straight (5). Clamp or nail down the fence securely (6). 

Prevention of arson Control access at all times Screen employees and casual labour Lock away flammable substances and keep combustibles away from doors, windows, fences Provide regular fire safety patrols, even where automatic systems are provided Secure particularly storage and unmanned areas... 

Ensure appropriate levels of security, hazard warning notices, fences, patrols. Control access including vehicles Segregate/seal drains... 

Security arrangements should be such as to prevent tampering or vandals. Fencing should be of robust wire mesh which does not obstruct ventilation. 

The security system can be considered as layers of protection. Physical barriers and deterrents constitute not only the building stmcture itself, made up of walls, doors, windows, floor and a roof, but the yard around the building and probably a perimeter fence or wall. 

An important principle is that security must be built in depth - otherwise known as defense in depth. In this context, it may be helpful to think of security as a set of concentric rings, where the target is located at the center. Each ring represents a level of physical protection (perimeter fence, building shell, security case) but the number of rings and security resistance will vary relative to the risk. The spaces between the rings may represent other defensive measures such as closed-circuit television (CCTV), security lighting, intruder alarm systems, etc. 

Perimeter fencing may enhance the security of any premises. Not only does the fence present an obstacle for intruders to overcome but also it establishes the principle of defensible space and constitutes a psychological barrier to access. A perimeter fence, when supplemented by gates, traffic barriers and gatehouses (manned by security personnel or some other system of access control), allows the site operator to have control and supervision over all vehicles and pedestrians entering and leaving the site. 

There are three types of fencing suitable for security applications. In increasing order of security, these are ... 

In many cases, it is necessary to complement physical security by the installation of an intruder alarm system in order to achieve the standard of security commensurate to the risk exposure. The scope of protection to be afforded by the alarm system depends on the security risk, but it may embrace fences, windows, doors, roofs, walls, internal areas, yards and external open areas, and vehicles inside and outside buildings. There is a comprehensive range of detection devices, but the choice of detector is critical to ensure that it provides the desired level of protection and is stable in the particular environment. 

To achieve a good intrinsic visible fruit quality, biotic and abiotic stress to the trees has to be controlled. Therefore, conventional fruit orchards are often fitted with relatively expensive installations such as wind break hedges, hail nets, irrigation systems and wind machines for frost prevention, irrigation and liquid fertilisation facilities and wild animal fences. Apart from liquid fertilisation systems, most of these installations can also be installed in organic orchards and help to assure yield and quality security. 

Physical security Security systems and architectural features that are intended to improve protection. Examples include fencing, doors, gates, walls, turnstiles, locks, motion detectors, vehicle barriers, and hardened glass. 

In some parts of the world religious functions may occur several times a day and every day of the week. These functions are generally required to be performed at the immediate location of an individual. These activities must be respected and accommodated for the employees and any personnel who may be in attendance at the facility. Typically where hydrocarbon facilities are located in areas were such practices are performed, a specialized installation (i.e., mosque) is normally provided. The primary concern in their application is that the installation does not interfere with the operation of the facility, is not provided within the confines of a hazardous location (i.e., process location), and that it is shielded or removed from the effects of an explosion or fire. Typical applications provide these specialized facilities just outside the security fencing and access gate a facility. 

Chain-link security fencing enclosing the system. 

Again, as shown in figure 9.1, layered security starts with the outer perimeter (the fence—the first line of physical security) of the facility and goes inward to the facility, the buildings, structures, other individual assets, and finally to the contents of those buildings—the targets. 

In the discussion above, conditions described referred to perfect world conditions—that is, to those conditions that we would want (i.e., the security manager s proverbial wish list) to be incorporated into the design and installation of new chemical industry infrastructure. Post-9/11, in a not-so-perfect world, however, many of the peripheral (fence line) measures described above are more difficult to incorporate into chemical industry site infrastructure. This is not to say that industrial chemical facilities do not have fence lines or fences most of them do. These fences are designed to keep vandals, thieves, and trespassers out. The problem is that many of these facilities were constructed several years ago, before urban encroachment literally encircled the sites—allowing, at present, little room for security stand-backs or setbacks to be incorporated into plants or critical equipment locations. Based on personal observation, many of these fences face busy city streets or closely abut structures outside the fence line. The point is that when one sits down to plan a security upgrade, these factors must be taken into account. 

Fences are often compared with walls when determining the appropriate system for perimeter security. While both fences and walls can provide adequate perimeter security, fences are often easier and less expensive to install than walls. However, they do not usually provide the same physical strength that walls do. In addition, many types of fences have gaps between the individual pieces that make up the fence (i.e., the spaces between chain links in a chain-link fence or the space between pickets in a picket fence). Thus, many types of fences allow the interior of the fenced area to be seen. This may allow intruders to gather important information about the locations or defenses of vulnerable areas within the facility. 

There are numerous types of materials used to construct fences, including chain-link iron, aluminum, wood, or wire. Some types of fences, such as split rails or pickets, may not be appropriate for security purposes because they are traditionally low fences, and they are not physically strong. Potential intruders may be able to easily defeat these fences either by jumping or climbing over them or by breaking through them. For example, the rails in a split fence could be broken easily. 

The correct implementation of a fence can make it a much more effective security measure. Security experts recommend the following when a facility constructs a fence ... 

Other types of hardware can increase the security of the fence. This can include installing concertina wire along the fence (this can be done in front of the fence or at the top of the fence), or adding intrusion sensors, cameras, or other hardware to the fence. 

A hedge (see pp.142-145) is without doubt the most environmentally beneficial garden barrier. But hedges take time to mature, require trimming, and occupy space. Solid walls and fences provide a practical alternative where space is limited and a secure definition of boundaries is an immediate priority. 

After receiving an anonymous tip that Ciraolo was growing marijuana, police in Santa Clara, California, tried to look into his backyard. If they could see the plants, they could get a search warrant. However, the fence around the yard was too high, so they hired a private plane and flew over the house at an altitude of 1,000 feet. Being able to confirm the presence of marijuana plants, they secured a search warrant and then arrested Ciraolo, who pled guilty to cultivation of marijuana. An appeals court, however, ruled that the fly-over constituted an illegal search and reversed Ciraolo s conviction. The case eventually reached the U.S. Supreme Court. 

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