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Water Flow Calibrations
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ONLY A PORTION OF THIS SERVICE IS AVAILABLE BECAUSE THE
FACILITIES ARE BEING UPGRADED
NIST
provides calibration services for water flow meters. The Water Flow Calibration
Facility consists of a reservoir, pumps, meter runs, and weigh tanks. The
system operates as a constant flow facility and uses timed collections of
water to compute the average flow through the meter being calibrated. The
planned relative expanded uncertainty for these facilities is 0.12%, or less.
Flows up to 38,000 L/min (10,000 gal/min) will be provided in pipes up to
40.6 cm (16 in) in diameter. At present, a 3700 L collection tank and a 100
mm pipeline is ready for calibrations. This subsystem has an expanded uncertainty
(k = 2 or approximately 95 % confidence level) of 0.033% for flow rates from
40 to 1500 L/min. The upper limit can be increased up to 4000 L/min. NIST
will make the 200 mm pipeline and 22.500 L tank subsystem available by the
end of 2006.
Pipe connections should be ASA 150 lb steel flanges, VictaulicTM
couplings, or adapters thereto. Meters can be tested if the flow range and
piping connections are suitable, and if the system to be tested has precision
appropriate for calibration with the NIST flow measurement uncertainty. We
charge $4,517 per flow meter for our normal calibration. We deliver a calibration
report which includes an uncertainty for the flow meter calibration factor.
The uncertainty of these flow meter calibration coefficients will also depend
on the reproducibility of the meter under test and the uncertainty for the
flow meter calibration factor. The uncertainty of these flow meter calibration
coefficients will also depend on the reproducibility of the meter under
test and the uncertainty of any instrumentation associated with measuring
the flow meter output. To read more about the principles of operation and
uncertainties of our Water flow standard and to see sample calibration reports
see our Technical
Notes and Publications.
A normal flow calibration includes five different flows, with five averages
of the meter readings and the standard flow measurement made at each set point,
with this entire test sequence repeated on a second day to assess reproducibility.
It is helpful if the customer specifies the flow set points and the instrumentation
requirements of the meter (pressure, temperature, full scales required, etc.).
Turnaround time for a single flow meter is approximately 4 weeks:
- Allow 2 weeks for shipping;
- 1 week for set-up and review; and
- 1 week for report writing and review.
Please contact Iosif Shinder to schedule the calibration of your instrument(s).
To have your water flow meter(s) calibrated:
- Contact Iosif Shinder to schedule your calibration dates;
- Fax or mail a purchase order to Iosif Shinder following purchase order guidelines and choosing a Service ID Number which can be found in the NIST Calibrations User's Guide SP 250, and
- Ship
your flow meter(s) to Iosif Shinder following shipping
procedures outlined in the
NIST
Calibrations User's Guide SP 250.
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Iosif Shinder |
John
D. Wright National Institute of Standards and Technology Fluid Flow Group 100 Bureau Drive, Stop 8361 Phone: 301-975-2451 Fax: 301-258-9201 Email: john.wright@nist.gov |
updated: 10/18/06