Bid Package 08 North Well Field - Garney Construction

Colorado River Municipal Water District
Raw Water Supply Well Sites
Ward County North Well Field
1.4 STANDARDS
The applicable provisions of the following standards shall apply as if written here in their
entirety:
ASTM A-126 Specification for Gray Iron Castings for Valves, Flanges and Pipe Fittings
ASTM B-61 Specification for Steam and Valve Bronze Castings
1.5 JOB CONDITIONS
A. SPECIAL TOOLS: Furnish a kit which contains special size wrenches and other types of
tools, not normally available, which are necessary for assembling, disassembling,
aligning, and calibrating each piece of equipment. In addition, any piece of equipment
(meter, test set, etc.) required by the Manufacturer to align, adjust, or otherwise calibrate
any item under this section of the specification shall be furnished, including software.
PART 2 PRODUCTS
2.1 ELECTROMAGNETIC FLOW TRANSMITTER
A. Flow element shall be of the electromagnetic type utilizing the pulsed DC type coil
excitation principle with high preamp input impedance. The flow measuring system,
consisting of low element, transmitter, and appurtenances, shall have an overall accuracy
of ±.25% of rate with a 10:1 turndown for all flows resulting from pipe velocities of 1' to
31' per second. Stream fluid meter size and flow range shall be as noted. Unit shall have
zero stability feature thereby eliminating the need to stop flow to check zero alignment.
B. The flow element shall be of water-tight, NEMA 6 construction for submersible
applications. Meter shall consist of a 304 stainless steel meter tube, 150 pound ANSI
carbon steel raised-face flanges, ebonite hard rubber liner, and Hastelloy electrodes,
unless otherwise noted. Electrodes shall be either flush or bullet nose type. Suitable
covers shall be provided for flow elements ends to protect the tube liner during shipment.
Liners for magnetic flow meters shall be neoprene.
C. Flow transmitter shall be enclosed and water-tight, NEMA 4X construction for outdoor
installation and mounted on the flow meter. The transmitter output shall be a 4-20 mA
DC signal in linear proportion to flow and shall dive loads with impedances in the range
of 0 to 800 ohms without load adjustments for a 24V DC supply. Output span and zero
shall be manually adjustable. Both transmitter and primary element shall be powered
from the same 120 volt, 60 Hz source.
D. Provide an isolation kit for the flow meter.
E. The flow meter shall come with the required amount of manufacturer’s supplied cable for
routing the signal from the flow element to the transmitter. See plans for location of flow
meter and transmitter. Manufacturer’s supplied cable shall be one continuous cable. No
splicing allowed. Special cables shall be installed in conduit. Cable(s) shall facilitate
both signal and power for the flow element (120 volt, 60 Hz power will be made
available at the transmitter).
May 18, 2012
Instrumentation Flow Meters
Revision 0 40 90 01.01-4