MODIFICATION
66 -- Liquid Flow Working Standard
- Notice Date
- 3/18/2010
- Notice Type
- Modification/Amendment
- NAICS
- 334516
— Analytical Laboratory Instrument Manufacturing
- Contracting Office
- Department of the Air Force, Air Force Materiel Command, 562 CBSG OMP (AFMETCAL), 813 Irving Wick Dr. W. Bldg 2, Heath, Ohio, 43056-6116, United States
- ZIP Code
- 43056-6116
- Solicitation Number
- FA2263-10-Q-0013
- Point of Contact
- Michael D Hickey, Phone: 740-788-5043, Glenna F Pound, Phone: 740-788-5040
- E-Mail Address
-
michael.hickey@afmetcal.af.mil, glenna.pound@afmetcal.af.mil
(michael.hickey@afmetcal.af.mil, glenna.pound@afmetcal.af.mil)
- Small Business Set-Aside
- N/A
- Description
- *** 18 March 2010 *** The following questions pertaining to the purchase description have been proposed and the responses from the engineer accompany this amended combined synopsis solicitation. The due date for responses has also been extended from 26 March 2010 to 6 April 2010. 2.3 Measurement Uncertainty Q: The uncertainty budget of ±0.20% only leaves ±0.05% for the LFWS system. Does this also include the ±0.5° temperature control effect on viscosity? Will the reference meters be calibrated on multiple fluids and a multi-fluid Roshko Strouhal table be used or will each meter be calibrated for a single viscosity. Will be able to see samples of the reference meter data to evaluate the effects of multiple viscosities or interpolation variations on the uncertainty? A: The ±0.5 °F is of a nominal set point. The uncertainty of the temperature measurement is therefore the relevant measure for uncertainty. Single or multiple viscosity characterizations will be based on the requirements at each location. If a specific number of calibration points for the reference meters are required to meet the requirements, please state that in the proposal. The AF calibrates turbine flowmeters at 10% full scale increments from 10% to 100% of full scale, and at 1% full scale increments below 10% full scale. 3.1 Flow Rate Control Q: Is there any considerations given to prevent over speeding of the flowmeters under test? Is there any desire to protect the reference turbine flowmeters from over speeding? A: This can be proposed as additional capability. 3.3 Pressure Control Q: Are you requesting that the test pressure be at 150 psig or do you want the pressure to be adjustable up to 150 psig? A: Adjustable up to 150 psig. 3.5 Software Q: Does the software need to allow some access to underlying equations so that the Air Force may change them in the future if desired? Is password security access acceptable? A: Our experience has proven that access to equations can result in accidental changes that negatively affect measurements, and it is unlikely that the fundamental underlying equations will need to be changed. Password security access is not acceptable. 3.5.1.1 Test Instruments Q: Based on the number of available outputs, do you require multiple meter calibrations? A: The LFWS shall be capable of calibrating multiple meters. 3.5.2 Reference Meters Q: Does this mean that more than one master meter might be used to calibrate a flowmeter under test? Where are the reference meters to be installed? It appears the two test sections are intended for units under test. We need clarification on the intended installations. A: More than one master meter may need to be used to calibrate a flowmeter under test. The reference meters can be installed in either meter section. Two sections are required, and a test instrument may ultimately be installed in the same meter section as the reference meter. In that case, if that is the only meter being calibrated, the other meter section is not used and the "straight pipe" identified in 4.5 would be installed in the unused meter section. 3.5.7 Software Warranty Q: Will AFMETCAL be willing to install revised software, or will the supplier have to travel to site? A: AFMETCAL will distribute the software and it will be installed by each individual lab. 4.1 Calibration Fluids Q: Will the fluids be changes regularly? What procedures are required to prevent contamination of the hydrocarbons with water and vice versa? Are there explosion proof requirements since Mil-C-7024 has a low flash point? A: While only speculation, it is believed that fluids will not be changed very regularly. Procedures to prevent contamination will be developed by the Air Force or can be incorporated into the design and/or stated in the manual. Necessary considerations based on these fluids should be incorporated into the proposed design. 4.4 Drain Pan Q: Are the reference turbine meters in the same section as the test meters? A: They can be but are not required to be. 4.5 Meter Sections Q: Would this be a 2" AN fitting? A: This paragraph indicates that the design shall accommodate at least two inch diameter meters. If the design is to 2", then a 2" AN fitting would be appropriate. Q: How many flowmeters do you want to calibrate at one time? Are both test sections functional and producing calibration data at the same time? A: The number of flowmeters calibrated at one time would be based on pressure drop and/or the amount of inputs. 4.5.1 Sliding Test Instrument Surface Q: Please clarify this requirement? A: Traditional positive displacement liquid flow calibrators have a drip pan with angled surfaces to direct spilled fluid down into a pipe for recirculation. Having a flat, sliding, test instrument surface that spans the drip pan allows for instruments such as rotameters to sit on or to be propped up onto for vertical positioning and stability. 4.5.3 Flow Straightening Q: Are you requiring a set of different flow straighteners to cover ½" up to 2"? What end fittings are required on the flow straighteners? A: The piping leading to the meter sections shall have sufficient flow straightening, thereby not decreasing the meter section length as described in 4.5. Fittings are addressed in 4.5. 4.5.3 Meter Section Temperature, Densities, and Viscosities Q: Does this imply that the temperature probe will be located at the output of the reference flowmeter and the input of the meter under test? Are you asking for multiple temperature sensors to be placed at the inlet of both the reference flowmeter and the meter under test? A: The temperature probes are at the inlet of each meter section, upstream of the meter(s) in that section. The temperature at each inlet is used for determination of fluid density and viscosity of that meter section. 4.8 Size Q: Are there some space restrictions that require the length to be restricted to 10 feet long? Would 164" be acceptable? A: Yes, there are space restrictions that dictate this requirement. 164" is therefore not acceptable. 4.9 Portability Q: How do you intend to move the LFWS with a chilled water source and air supply hooked up to the calibrator? Do you require flexible hoses for these connections? If so, how long? A: Castors allow for moving the LFWS around the lab, more for positioning the unit originally and in the future as needed, rather than for moving it in the context of operation as the question implies. Flexible hoses do not need to be supplied. 4.11 Power Requirements Q: Will a fused disconnect and plug be provided or is that part of the installation requirement? A: Fuse size should be stated and can be integrated into the unit.
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