U. S. Army Engineer District, Savannah, P.O. Box 889, Savannah, Georgia 31402-0889

61 -- 75 KVA POWER CONDITIONERS SOL DACA21-99-B-0010 DUE 030199 POC Judy Saturday, Contract Specialist, (912) 652-5809, or Julie Talley, Contracting Officer, (912) 652-5898 WEB: Corps of Engineers, Savannah District, Contracting, http://www.usace.army.mil. E-MAIL: Judy R. Saturday, judy.r.saturday@sas02.usace.army.mil. The purpose of this modification is to Amend Subject Solicitation. Bid Opening date is changed From: February 16, 1999, To: March 1, 1999. Also, to add questions submitted from offerors and answers to questions concerning this solicitation as follows: 1. A review of comments provided by Messrs. C. Kovach and Dan Zemel of Generator Technologies, Inc., has been made. a. Inquiry: As clarified by Mr. Dan Zemel, General Technologies, Inc. believes the specification, in particular paragraph 2.9.3(a), voltage regulation, to be proprietary because of the statement "Unit shall be capable of continuous operation under a brownout condition of -40% of the input voltage with the output being regulated to plus or minus 5%". b. Response: The requirement is not proprietary as there are both rotary and static power conditions available that meet the requirement; however, this amendment contains revisions to the specifications addressing this question and enhancing competition. 2. A review of comment provided by Mr. RonGeneroso of Jones Engineering Sales, Inc. has been made: a. Inquiry: "Please advise if 65 dbA noise level at 5 feet is acceptable in lieu of 58 dbA as specified." b. Response: This amendment contains revisions to paragraph 2.9.2 (g) addressing this question. 3. A review of statements provided by Mr. Terry L. Gentner of National Electrical Systems, Inc. has been made. a. Inquiry: "Please confirm DWG-El is for information only and no work is to be done under this contract.: b. Response: See note on drawing E-1. Note states "THIS SHEET IS PROVIDED FOR SITE INFORMATION ONLY. ALL WORK SHOWN ON THIS SHEET SHALL BE CONSIDERED EXISTING TO REMAIN." No new work is indicated on this sheet. c. Inquiry: Spec's are really very inconsistent. It looks like a want list, not a realistic product spec. It was our understanding this spec. was originally designed around a M-G set; and now it looks like a rotary Unit. There are a variety of items that are confusing: (1.) You are looking for completion in 75 days. M-G set is 120 day delivery; rotary unit 84-112 day delivery; static unit about the same as rotary. (2.) Par 2.9.2 (g) requires sound deadening enclosure: (3.) Par 2.9.3 (a) cannot be performed with a rotary or static unit. (4.) Par 2.9.3 (g) efficiencies shown are for static units. (5.) Par 2.9.3 (h) noise attenuation is "tempest" rated. Not readily available on commercial products. Only (1) company in U.S. can test to 120 db. In rotary/M-G requires fiber optic coupling between input and output and 4 bearing. A standard 2 BRG. Rotary is rated at 60 db. d. Response: The specification, as written, identifies minimum and/or maximum performance characteristics required for the power conditioning equipment. The specification does not require a specific unit type i.e. rotary, motor-generator set, or static, to meet the performance requirements. (1) Delivery time is based on project requirements and statements from 3 manufacturers contacted during preparation of plans and specifications. (2) Statement is in regard to the specification paragraph 2.9.2 (g). This amendment contains revisions to the specification addressing this question. (3) Statement is in regard to the specification paragraph 2.9.3 (a). The requirement is not proprietary as there are both rotary and static power conditions available that meet the requirement; however, this amendment contains revisions to the specification addressing this question and enhancing competition. (4) Statement is in regard to the specification paragraph 2.9.3 (g). The specification does not require a specific unit type to meet the performance requirements. (5) Statement is in regard to the specification paragraph 2.9.3 (h). As stated, the noise attenuation rating specified is not readily available, however it is available. The load end-use equipment manufacturer has established power conditioner performance characteristics. e. Inquiry: Request immediate answer and minimum 2 weeks for bid preparation after receipt of answers. F. Response: This amendment contains revisions to the bid period. 4. A review of comments involving technical clarifications provided by Mr. John McPartland of PDI has been made. a. Inquiry: Unit will have +/- 2% output voltage regulation vs. 3% spec'd. b. Response: Statement acknowledged. c. Inquiry: Unit will have an automatic uninterrupted bypass, though not specified. d. Response: Statement acknowledged. e. Inquiry: Efficiency will be 95-97%, saving the user thousands of dollars in operating costs over the 92% specified. f. Response: Statement acknowledged. g. Inquiry: Service will be from the front and back. h. Response: Specification paragraph 2.9 states "Components shall be accessible from the front and/or one side" indicating service to be performed from front and/or one side only. i. Inquiry: Inrush current will be as normal for a magnetic device without input current limit if soft start feature is really needed, it's available as an option @ 3,670.40. j. Response: Specification paragraph 2.9.2 (d) states "Inrush current shall be limited to a maximum of 150% of full load current during startup" indicating that inrush current shall be limited to 136 amps at 480 volts, 3 phase. k. Inquiry: Voltage input window will be +/- 15%. Voltage excursion outside of this window are not permissible under utility company charter. Outside of 15% plus or minus, these voltage excursions would be deemed outages, not brown-outs. l. Response: Statement is in regard to the specification paragraph 2.9.3 (a). This amendment contains revisions to the specification addressing this question. m. Inquiry: No anti-single phasing protection is claimed/provided. Even if the power conditioner could operate on a loss of input phase, our experience shows that the upstream and input overcurrent device would trip on overcurrent in this mode making such a "Feature" moot, The same comment could be made for operation with a 32-40% undervoltage. Unless all of the upstream devices are oversized to accommodate the significantly increased current that would flow with such an undervoltage, such a "feature" is meaningless. n. Response: Statement is in regard to the specification paragraph 2.9.3(i). This amendment contains revisions to the specification addressing this question. o. Inquiry: The above offer is for equipment only. We can offer installation services also from our GSA Contract, but we would need an "Installation Drawings" package, including construction specifications in order to figure the cost. A "Site Survey" service is also available from the GSA Schedule to determine the extent of the installation work required. Please let us know if you would like to arrange a suitable time for such a site survey. p. Response: Installation plans accompany the specifications for this solicitation. Posted 02/18/99 (W-SN299582). (0049)

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