FLOWMETER FACILITY - 1
DETAILED SPECIFICATIONS – FLOWMETER FACILITY
INDEX
Paragraph - Number
2-17-1
2-17-2
2-17-3
2-17-4
2-17-5
2-17-6
2-17-7
2-17-8
2-17-9
General
Operation & Maintenance Manuals
Start-Up Service
Field Test
Spare Parts
Guarantee
Fiberglass Metering Manhole
Parshall Flume
Flowmeter Instrumentation
FLOWMETER FACILITY - 2
2-17-1
GENERAL
The Contractor shall furnish and install a wastewater flowmeter facility complete
and operable consisting of a Parshall flume, ultrasonic type flowmeter,
instrumentation, electrical, fiberglass metering manhole, concrete work, earthwork,
control cabinet, piping, and all necessary appurtenances and fittings, as shown on
the drawings and specified herein.
2-17-2
OPERATION AND MAINTENANCE MANUALS
The Contractor shall furnish to the Owner five (5) copies of operation and
maintenance manuals for each of the following items:
- Flowmeter and instrumentation
2-17-3
START-UP SERVICE
The Contractor shall provide the services of a factory trained, qualified
representative for no less than two days to inspect the completed installation,
make all adjustments necessary to place the system in trouble free operation, and
instruct the operating personnel in the proper care and operation of the
equipment, prior to the final acceptance of the project. The Contractor shall
inform the Engineer at least 48-hours in advance of the start-up service.
2-17-4
FIELD TEST
When the flowmeter facility is complete and ready for operation, then the station
shall be inspected and tested for compliance to the contract documents. Tests of
the equipment shall be made in the presence of the Engineer, the Contractor, the
Electrical Subcontractor (if used), and the Owner's representative. The field test
shall include, but not be limited to, the following:
(a)
Flowmeter
The flowmeter shall be tested to determine satisfactory performance for
indicating and recording the proper flow rate for the level of fluid in the
Parshall flume.
(b)
Parshall Flume
The Parshall flume shall be inspected to determine if it was installed level
within the tolerances indicated by the manufacturer's installation
instructions.
(c)
Control Cabinet
The control cabinet shall be inspected to determine if it is watertight, and
all electrical components are properly mounted and overate correctly.
FLOWMETER FACILITY - 3
(d)
Inspection
A thorough inspection of all mechanical and electrical equipment and
controls, piping, fittings, brackets, mountings, seals, conduit, components,
and features shall be made while the station is being tested to determine
performance and compliance with design requirements and
specifications.
(e)
Structure
The station shall be inspected for performance, structural soundness, and
water tightness.
(f)
Repairs, Adjustments and Replacements
The Contractor shall make any and all necessary repairs, adjustments,
and replacements until performance has been demonstrated to the
satisfaction of the Engineer. The Contractor shall bear the cost of any
repair, adjustment, and replacement.
2-17-5
SPARE PARTS
The Contractor shall provide spare parts for routine maintenance and repair as
recommended by the equipment manufacturer and one year supply of chart
paper for the recorder which is calibrated and suitable for use with the flow
recorder.
2-17-6
GUARANTEE
The equipment shall be guaranteed against defects in material and workmanship
for a period of one year from the date of Owner's final inspection and
acceptance. Any defective equipment or workmanship shall be repaired or
replaced without delay by the Contractor without cost or obligation to the Owner
during the guarantee period.
2-17-7
FIBERGLASS METERING MANHOLES
Fiberglass metering manhole shall conform to ANSI/ASTM D-3753 for standard
specifications for fiberglass reinforced manholes.
The fiberglass manhole shall include Parshall flume, internal ladder and internal
instrument rack as an integral component of the structure. The manhole cover
shall be lightweight, 48 inches in diameter, with hinged fiberglass cover with hasp
for locking. All cover accessories shall be stainless steel. The fiberglass pipe end
adapters shall be provided with flexible watertight, neoprene connecting boots,
with stainless steel clamps. Fiberglass manhole and appurtenances shall be as
manufactured by Plasti-Fab, Inc., or approved equal.
FLOWMETER FACILITY - 3
2-17-8
PARSHALL FLUME
The Parshall flume shall be installed as shown in the Drawings according to the
manufacturer's installation instructions. The Parshall flume shall be molded
fiberglass reinforced polyester resin with an upper temperature limit of at least
150OF and shall have a permanent white gel-coating on all wetted surfaces. The
flume shall have a throat width of 3 inches, a height of 24 inches and be molded in
one piece with ample wall thickness and reinforcing ribs to prevent distortion
during shipment, installation and operation. The flume shall be self-supporting and
require no external supporting structure. Interior dimensions shall conform to those
shown in the latest revision of U.S. Department of Interior, Bureau of Reclamation,
Water Measurement Manual.
A staff gauge graduated in feet, with 50 divisions per foot, shall be attached
vertically flush to the inside of one wall of the converging section of the flume. The
staff gauge shall be located two-thirds the distance from the throat of the flume to
the upstream end of the flume's converging section. A 1/4-inch I.D. PVC or stainless
steel air tube, pressure tested at 150 psi, shall be formed integrally into the wall of
the flume and penetrate the wall of the flume at the bottom, of the wall directly
opposite the staff gauge, without creating any roughness or flow obstruction on
the inside surface of the flume. The top of the air tube shall be provided with a
removable plug.
The Parshall flume shall be Plasti-Fab 3-inch PF-DRX-BT Parshall Flume, or equivalent.
Contractor shall submit shop drawings of Parshall Flume for review prior to
fabrication.
2-17-9
FLOWMETER INSTRUMENTATION
(a)
Scope
The work included in this subsection consists of furnishing, installing and
placing in operation all the instruments, controls, electric service
entrance, and appurtenances, including all conduit, wiring and circuitry
necessary to provide the monitoring, transmitting and recording functions
indicated on the Drawings and herein specified for use in measuring
untreated domestic wastewater flow through a Parshall flume.
Flowmeter instrumentation shall be a complete system as manufactured
by Fischer & Porter, or approved equal.
(b)
Submittals
In order to provide an integrated system and undivided responsibility,
prior to release for manufacture, it shall be the Contractor's responsibility
to coordinate and submit a total package containing the following
information.
1. A complete wiring diagram inclusive of all instrumentation with
appropriate component identification as indicated in Subparagraph
9.2.c. below.
FLOWMETER FACILITY – 5
2. Component manufacturing data sheets with factory wiring diagrams
for all components either in the system or to which the systems
connect.
3. Component manufacturing data sheets shall indicate all pertinent
data and identify each component by item number and
nomenclature as indicated on the Drawings and in the Specifications.
4. Detailed dimensional drawings of Parshall flume, instrumentation, and
instrument enclosure.
All literature and drawings being submitted for approval shall be
bound in volumes. Sales bulletins and other general publications are
not acceptable as material for approval when not accompanied by
additional literature and drawings pertaining specifically to this
project.
After the material has been forwarded for approval, the
manufacturer of the equipment shall make available the services of a
project engineer and other qualified personnel as required to assist
the Contractor in reviewing the submittal with the Engineer.
(c)
Miscellaneous
All special tools and test equipment required for the maintenance,
testing, or adjustment of the mechanism shall be furnished by the
Contractor.
(d)
Design Criteria
All of the equipment shall be the manufacturer's latest and proven
design. Specifications and Drawings call attention to certain features,
but do not purport to cover all details entering into the design of the
instrumentation system. The completed system shall be compatible with
the functions required and with the equipment furnished under the
Contract. All electrical components of the system shall operate on 120
volt, single phase, 60 cycle current, except as otherwise noted in the
Specifications.
Control Cabinet for flowmetering equipment shall be located next to
electric service entrance as shown by the Drawings.
The control cabinet manufacturer shall design, furnish and install all
interior wiring and components within the control panels complete and
ready for connection of external wiring by the Contractor. The Contractor
shall make all connections of exterior wiring between the equipment and
the control cabinet terminal boards. However, the control cabinet
manufacturer shall furnish complete wiring diagram showing the
electrical circuits inside the cabinet and interconnections between the
panel and the external instruments and components. Interconnecting
FLOWMETER FACILITY - 6
wiring between the panels and the equipment specified under other
sections shall be identified and numbered on the diagram. All terminals
shall be identified and numbered. All cabinet wiring shall have
numbered tags attached to each wire for identification. All cabinet
wiring shall be not less than Number 16 gauge stranded copper wire type
THWN. Inside each cabinet there shall be provided a copy of
interconnecting wiring diagram.
All necessary fuses or switches required by the control cabinet
manufacturer for his equipment shall be provided with the equipment.
Any other devices necessary to obtain proper operation of the control
systems from the available energy sources shall be furnished with the
control cabinet. Cooling fan, thermostat, lightning and surge protection,
and other ancillary devices required by flowmeter manufacturer for
proper operation shall be provided and the cost of such equipment shall
be included in the bid price for the project.
All components shall be tagged with the item
nomenclature given in the Specifications or Drawings.
number
and
All instruments to be cabinet mounted shall be of the same appearance
as to provide a clean and neat installation.
All instruments shall be constructed to operate, function and last in a
tropical climate as found in Pinellas County, Florida. Components shall
be factory finished to the manufacturer's standard for the service
intended.
Accuracy of completed flowmeter installation shall be within +/-I% of
flow at upper span setting. Span range shall be field adjustable. Initial
upper span setting and meter calibration shall be for a maximum flow of
0.8 MGD.
(e)
Sensing Element
Ultrasonic Type: Flow sensing element shall be the Fischer & Porter
transponder, used with the Type 5OUS Open Channel, Flowmeter, and
located as shown by the drawings and as recommended by the
manufacturer. Transponder shall be installed within the fiberglass
metering manhole suspended from a 3/16-inch diameter stainless steel
bar. Connecting cable between transponder and transmitter shall be
run within conduit from the manhole to the flowmeter housing. The
connecting cable shall not pass directly from the transponder, to the
flowmeter housing, without conduit outlet filled with silicone located
outside both the transponder enclosure and the flowmeter housing in
order to positively prevent wastewater gasses in the flume area from
entering the flowmeter housing.
(f)
Flowmeter
Flowmeter shall be the Fischer & Porter Model 5OUSI111A-1 ultrasonic
FLOWMETER FACILITY - 7
open channel flowmeter with 133CO38UOl counter (totalizer) and Fischer
& Porter Model 51-132ICB-ilBCXII 30 day strip chart recorder, or approved
equal. Totalizer shall be eight digit, non resettable, and sealed in U.S.
gallons. Transmitter indicator and the recorder shall register 0-100% span.
Future maximum flow rate for the facility will be 0.8 MGD but the initial
maximum flow rate shall be set for 0.2 MGD. Flowmeter shall be capable
of being connected to telemetry equipment in the future.
(g)
Flowmeter Housing
The housing for the flowmeter equipment shall be 14 gauge Type 304
stainless steel, NEMA 3R weatherproof construction for mounting on a
stainless steel enclosure for the transponder as indicated by the drawings.
Housing shall include ventilation fan, with thermostat control. Insect
screens shall be provided over all vents. The Housing shall have a
sub-panel on which equipment is mounted, a hinged and lockable blind
front panel, and a bolted rear panel which will allow access for making
electrical connections to equipment.