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By Richard Rudman
Assuring continuity of electrical power for computers, point
of sale terminals, servers, communications resources, or other critical
electronic facility needs.
It's no secret. Your facility may be operational, but failure
of sensitive electronics can cripple your ability to conduct business.
There is much more than solid emergency power to consider.
Guarding Against Failure
If computers, transmitters, or telephone equipment depend on cool air
for their day-to-day survival, how can they continue to operate when your
one air conditioner malfunctions as collateral damage to the main disaster?
Precautions must extend right down to the wires and cables that link all
of your sensitive electronics. This means assuring that adequate service
loops are in place so earthquake and/or other stresses will not compromise
the connections. Computers, point-of-sale terminals, server racks and
communications terminal equipment are secured and mounted so they cannot
fall in an earthquake, or be easily flooded out.
Emergency Power and Battery Backup
UPS, or Uninterruptible Power Supplies, are now a fact of life in the
telecommunication and information workplace. From a small UPS that plugs
into an outlet at a personal computer, to giant units that can power an
entire facility, they all have one thing in common - batteries. UPS batteries
have a finite life span. Without good batteries, a UPS is nothing more
than an expensive door stop. UPS batteries must be tested regularly. The
UPS should go on line to test it. Some units test themselves automatically.
Routinely pull the UPS AC plug out of the wall for a manual test. Some
UPS applications require hours of power, while some only need several
minutes.
While a UPS provides emergency power when the AC dies, many
are programmed with another electronic agenda: Protect the devices plugged
in from what the UPS thinks is Bad Power. Many diesel generators in emergency
service are not sized for the load they have to carry, or they do not
have proper power factor correction. Computers and other devices with
switching power supplies can distort AC power wave forms. The result:
Bad Power.
After a UPS comes on line, it should go back to sleep to
recharge its batteries when the emergency generator picks up the load
or city power is restored. If an intelligent UPS senses the AC power equivalent
of poison, it stays on, or it may cycle on and off. Thus, even though
your generator is operating, the UPS battery can run down and cause a
failure. Your best defense is to test your entire emergency power system
at least once a month under full load, and do proper preventive maintenance
on all batteries. Many problems can be corrected by reprogramming the
UPS. Consult your UPS manufacturer or service provider to see if your
UPS can be adjusted to be more tolerant. All UPS cycling cannot be avoided,
especially if heavy loads like air conditioners switch on and off line.
The Care and Feeding of Emergency
Generators
Some people still believe starting an emergency generator with no load
is an adequate weekly test. If your generator is diesel-driven, this may
lead to Wet Stacking. Wet Stacking occurs when a generator is run repeatedly
with no load or a light load. When the generator is asked to come on line
to power a full equipment load, deposits that build up during no-load
tests prevent it from developing full power under load. You must test
with the load your diesel is expected to carry during an emergency. If
not possible, obtain a device called a load bank that can simulate a full
load. The generator can then be hooked up to the load bank for extended
hard runs several times a year.
Stored fuel gets old. Fuel begins to break down. Gum and
varnish can form. Certain algae can grow. Fuel additives extend the useful
storage period and prevent algae growth. A filtering system, and a planned
program of fuel cycling will mitigate these risks.
Your maintenance tech should submit fuel and crankcase oil
samples for lab testing. The fuel report will let you know if your storage
conditions are acceptable. The crankcase oil report might find microscopic
metal particles: an early warning of a major failure. Underground fuel
tanks can spring a leak and introduce water into the fuel and create for
you a costly hazardous materials clean up project.
A running generator will consume crankcase oil, and possibly
even radiator coolant during extended runs. You should know your generator's
crankcase oil consumption rate so you can add oil well before the engine
grinds to a screeching, non-lubricated halt. Watercooled generators must
to be checked periodically to verify there is enough coolant. You should
have enough coolant and oil to get the facility through a minimum of one
week of constant duty. If possible, install external crankcase and coolant
reservoirs to eliminate the need to stop the generator and check the oil
and coolant levels.
Most experts recommend a generator health check every six
months. Generators with engine block heaters put special stress on fittings
and hoses. Vibration loosens bolts and fatigues fittings, wires and connectors.
If your facility is super-critical, you may decide to install a second
generator. During the August, 2003 US/Canadian power outage, a Toronto
office highrise lost not only primary power, but generator power as well,
leaving tenants in desperate straits.
Mission dictates need. Need dictates reliability. If the
design budget permits, a second or even third emergency generator is a
realistic insurance policy. When you are designing a facility you are
told must never fail, consider a redundant and parallel-wired UPS.
During major overhauls and generator work, make sure you
have a local source for reliable portable power. High-power diesel generators
on wheels are readily available to supply field power. For sources of
temporary power, consult the Resource Directory in the Disaster Resource
GUIDE, or online at www.disaster-resource.com.
If you are installing a new diesel, engines over a certain size may need
licensing by your local air quality management district. Permits must
be obtained to construct and store fuel in an underground tank.
Transfer Switches for Emergency
Power
Many facilities use an automatic transfer switch to sense when utility
power fails, start the generator, and switch it on line. When utility
power is restored, most transfer switches wait a prudent amount of time
and automatically switch back. These transfer switches contain parts and
connections which need at least annual checks. A qualified electrician
can perform a simple test to verify high current connections in the switch
are tight and corrosion-free. It uses a hand-held infrared heat sensor
at each terminal to detect inappropriate heat. This is also a good way
for qualified electricians to check all AC and battery power connections
on your site right down to each circuit breaker and each battery terminal.
Air Handling Systems
People and equipment can crash when they overheat! Clean, cool, dry and
pollution-free air in generous quantities is critical for modern communications
facilities and their staff. If you occupy a high-rise, you may not have
your own air system. Many building systems have no air handling backup,
do not provide nights and weekend supervision, and may have less than
reliable maintenance support. Your best protection is to get the exact
terms for air conditioning nailed down in your lease. You may wish to
consider adding your own backup system - a costly but essential strategy
if your building air supply is unreliable or has no backup.
Several rental companies specialize in emergency portable
industrial-strength air conditioning. An emergency contract, arranged
before an event, for Heating Ventilating and Air Conditioning (HVAC) that
can be invoked with a phone call could save you hours or even days of
downtime. Consider buying a portable HVAC unit if you are protecting a
super-critical facility.
Wherever cooling air comes from, there are times you need
to make sure the system can be forced to recirculate air within the building,
temporarily becoming a closed system. Smoke or toxic fumes from a fire
in the neighborhood can enter an open system. Toxic air can incapacitate
your personnel. Forcing the air system to full recirculation could avoid
or forestall calamity.
Electromagnetic Pulse Protection
(EMP)
The EMP phenomenon associated with nuclear and some chemical explosions
can disable many electronic components in a computer-based device or communications
system. EMP energy can enter any component or system coupled to a wire
or metal surface directly, capacitively, or inductively. Some chemical
weapons can produce EMP, but on a smaller scale. The Federal Emergency
Management Agency (FEMA), now part of the Department of Homeland Security,
has been involved in EMP protection since 1970 and is charged at the federal
level with the overall direction of the EMP program. FEMA provides detailed
guidance and, in some cases, direct assistance on EMP protection to critical
communications facilities in the private sector. Any site that depends
on radio frequency equipment, including AM, FM and TV Transmitter facilities
need EMP protection. If you are responsible for such a site, you should
discuss EMP protection tactics with a knowledgeable consultant before
installing protection devices for your radio frequency (RF) circuitry.
EMP devices such as gas discharge tubes can fail in the presence of high
RF voltage conditions and disable facilities through such a failure.
About the Author
Richard Rudman was Director of Engineering for All
News KFWB Radio in Los Angeles for 27 years and now consults on the Emergency
Public Information issues including the Emergency Alert System (EAS),
advanced warning systems, and communications site preparedness. He can
be reached at richardrudman@earthlink.net.
(213) 447-5392 or www.Remote-Possibilities.com
Bibliography
Baylus, Ellen, "Disaster Recovery Handbook," Chantico
Publishing Company
Fletcher, Robert, "Federal Response
Plan," Federal Emergency Management Agency, Washington, D.C. 20472
Federal Emergency Management Agency
(FEMA), "Electromagnetic Pulse Protection Guidance, Vols. 13," Washington,
D.C. 20472
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