CEMP-E
TI 811-12
18 August 1998
(7) Annular pitot tube flow sensors provide good accuracy and will be considered for chilled
water, hot water and steam measurements not requiring the accuracy and rangeability of a turbine or
vortex shedding flow sensor. Insertion annular pitot tube flow sensors are installed using hot-tap methods
without shutting down the process system.
(8) Positive displacement flow sensors will be considered for domestic water, fuel oil, and
pumped condensate flow measurements.
(9) The physical installation of air flow sensors requires minimum straight runs of duct similar to
the requirements for liquid flow sensors. In existing duct installations where the required straight runs can
not be maintained, installation of air flow measurement stations in the fan inlet will be considered.
e. Metering on the incoming electric service requires a set of pulsing contacts for consumption and
demand measurements. Whenever local metering for individual buildings or selected equipment is
required, current and potential transformers connected to watt transducers, or meters with pulse contacts,
will be installed at each location.
f. UMCS control devices, including relays, transducers, and electropneumatic devices will be
applied as described in Chapter 5.
23. WIRING REQUIREMENTS.
a. All wiring will be in accordance with TM5-811-2, Electrical Design, Interior Electrical Systems.
Low voltage wiring in mechanical rooms and plenums and where exposed to physical damage will be in
conduit for protection against physical damage. Low voltage wiring in concealed spaces other than
plenums, where it is not subject to physical damage, does not have to be run in conduit where permitted
by installation criteria.
b. Electrical disconnect means for UMCS controlled devices as required by NFPA 70 will be
provided when there is not a disconnect within sight of the device location.
c.
All existing safety interlocks will remain in place.
24. TRANSIENT PROTECTION.
a. The UMCS electrical power supply, data transmission system, and input/output functions must be
protected against transients as described in Chapter 2.
25. DRAWINGS. The drawings for a complete UMCS design will include all the requirements in the A/E
scope of services. The drawings must include the following:
a. Alterations or additions required to create the Central Station/Island Station equipment room and
provide the proper environmental conditions. A physical layout of the Central Station/Island Station
equipment room is required, showing the UMCS computers, workstations, peripherals, accessories, and
storage space. Power sources, uninterruptible power supply, HVAC, lighting, and fire protection will be
shown in detail.
b. System configuration block diagram for the selected UMCS showing all Central Station
equipment , Island Station equipment and field equipment panels.
c. Installation drawings for Central Station equipment, Island Station equipment, and field
equipment.
d. Data transmission system configuration. Each data transmission circuit will be clearly shown.
The A/E will include details for each of the installation methods and locations, both indoors and outdoors.
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