MODIFICATION
66 -- Exhaust Gas Analyzer
- Notice Date
- 6/17/2009
- Notice Type
- Modification/Amendment
- NAICS
- 334516
— Analytical Laboratory Instrument Manufacturing
- Contracting Office
- Department of Commerce, National Institute of Standards and Technology (NIST), Acquisition Management Division, 100 Bureau Drive, Building 301, Room B129, Mail Stop 1640, Gaithersburg, Maryland, 20899-1640
- ZIP Code
- 20899-1640
- Solicitation Number
- SB1341-09-RQ-0252
- Archive Date
- 7/9/2009
- Point of Contact
- Paula Wilkison, Phone: 301-975-8448, Patrick K Staines, Phone: (301)975-6335
- E-Mail Address
-
paula.wilkison@nist.gov, patrick.staines@nist.gov
(paula.wilkison@nist.gov, patrick.staines@nist.gov)
- Small Business Set-Aside
- N/A
- Description
- The purpose of this amendment is to answer questions posed by a potential offeror. Question (1) The question posed previously has an "or" in it, so our question now is to which part of the question does the answer "Yes" apply? (Previous Question: Similarly for the Hydrocarbons, can the individual CxHy species be measured separately, or only as "total hydrocarbons as CH4"? Answer: Either method is acceptable. Whether that is provided by the instrument as the concentration of individual species or a conglomeration of hydrocarbon species represented as CH4, we would like to report the concentration of total hydrocarbons present in the exhaust stream. Simply reporting the concentration of CH4 alone in the exhaust is not acceptable. Question (2) There is no mention of absolute concentration of water (H2O) in the exhaust streams to be measured, and this can have dramatic measured results for the constituents whose LODs have been specified. (a) What is the highest absolute H2O concentration expected and (b) what are the ranges of absolute H2O concentrations expected in the exhaust streams to be measured? Answer: Micro cogeneration devices aim to remove as much heat from the exhaust stream as possible to increase the amount of heat they can deliver to the application. As most are based on combustion of natural gas, there is a significant amount of water in the exhaust, and since they remove much of the heat from the exhaust, often the exhaust gas is nearly saturated with water. Assume that the highest water concentration is saturation at 50 °C and atmospheric pressure. Assume that the lowest water concentration is a humidity ratio of 0.08 kg water per kg dry exhaust, which translates to about 16% RH in a 90°C, 1 atm exhaust stream. Although, the exhaust stream will more likely be near saturation. Additionally, there is the potential for the exhaust to cool further in the vent stack, which could cause condensation. Efforts have been taken to insulate the exhaust vent to inhibit condensation. Question (3) Do the requirements for analyzing O2 at the LOD of 0.01%, from a technical point of view, necessitate a paramagnetic O2 analyzer (more expensive, but better for lower concentrations of O2 and a faster response time than ZrO2 based O2 analyzers), or is the ZrO2-based O2 analyzer sufficient (response time ~ 30s)? Answer: The specific technology that measures the oxygen concentration is not important. A response time of 30 seconds is acceptable. Question (4) How is the exhaust to be treated after it passes out of the exhaust gas analyzer into the mechanical space that is temperature controlled? There will need to be some means to extract the exhaust from the mechanical space, correct? Answer: If the flow stream through the instrument is unable to be fed back into the exhaust stack, a vent line can be installed up to the roof. The vent line would be approximately 3 meters in length. Question (5) Based on the statement given to the question about temperature and pressure ranges of the exhaust gas streams "The facility will be used to test many different micro-cogeneration systems", what are the purge conditions that have to be met to insure complete elimination of exhaust constituents from the gas analyzer between analysis of exhaust gas streams resulting from each different micro-cogeneration system"? Answer: The facility only has the capability to test a single micro cogeneration device at one time. Therefore, no switching or purging sample lines is required. All other terms and conditions of the original solicitation are unchanged and remain in full effect.
- Web Link
-
FBO.gov Permalink
(https://www.fbo.gov/spg/DOC/NIST/AcAsD/SB1341-09-RQ-0252/listing.html)
- Place of Performance
- Address: 100 Bureau Drive, Mail Stop 1640, Gaithersburg, Maryland, 20899, United States
- Zip Code: 20899
- Zip Code: 20899
- Record
- SN01847851-W 20090619/090617235642-106e6661efdba26c798b9b0cbd8fc60c (fbodaily.com)
- Source
-
FedBizOpps Link to This Notice
(may not be valid after Archive Date)
| FSG Index | This Issue's Index | Today's FBO Daily Index Page |