66 -- 66 -- ISO SHELTER SYSTEMS

Notice Date

September 12, 2001

Contracting Office

Department of the Navy, Office of Naval Research, Naval Research Laboratory, 4555 Overlook Ave. S.W., Washington, DC, 20375

ZIP Code

20375

Solicitation Number

N00173-01-R-MS07

Response Due

September 17, 2001

Point of Contact

Mary Sandy, Contract Specialist, Phone 202-767-3710, Fax 202-767-0430, Email sandy@contracts.nrl.navy.mil -- F. Janilea Bays, Contracting Officer, Phone 202-767-2974, Fax 202-767-0430, Email bays@contracts.nrl.navy.mil

Description

The purpose of this amendment is to answer questions received from potential offerors and extend the due date for offers. Question 1: What is the format for pricing? Would you like to see one price for the seven shelters or a price for the five basic units and two modified units. Answer 1: Each shelter shall be priced separately. Questions 2: Ref. Spec. Item 4- "stackable" how high (how many units)? also, stackable under what conditions on the ground (stationary) or on a rolling ship? Answer 2: The units must be stackable two high. The bottom unit will be on leveling jacks which are on the ground. Question 3: Ref. Spec. Item 3 and Item 21 -- "Mid-Atlantic seaboard climactic conditions" and "operation between -40F to 125F" do not coincide. Which should we design to? Answer 3: Specification 3 and 21 each stand alone. Specification 3 defines the ac/heat as 5 ton/2 ton with dehumidification, however the unit will be in an external environment which is characterized as Mid-Atlantic Seaboard. Specification 21 gives the definition of wall insulation. Question 4: Ref. Spec Item 25 -- Shelter Modification- Is the triangular shelter extension to be insulated? Also, in Figure 3 are the call-outs for metal gasket and rubber gasket reversed? Shouldn't the rubber gasket be on the outboard of the interface? Does the triangular/slanted shelter extension have to be removable from the vertical shelter end? Answer 4: Specification 25, the triangular shelter extension is to be insulated and must be EMI tight. It does not have to be removable from the shelter. The rf gasket and the weather or rubber gasket may be reversed. Offer the best design to meet specifications. Question 5: . On spec page 5 of 18 in the section "Addition of a surge suppressor etc." In paragraph 2: The Array Power Line appears to be three discrete power input connectors, each being a three phase, 4-wire, 480 volt AC, 180 amps (150 KVA) input. Each input would have its own surge suppressor and would run through its own power line filter set and terminate in a single power distribution panel. This is not what is shown on figure 1c, page 9 of 18. The appearance there is for a single three phase, 4 wire 480 VAC, 150 KVA input with one surge suppressor rated for 480 VAC line-to-line and 277 VAC line-to-ground and running through three power line filters and terminating in a single panel. Are there appropriate distribution circuit breakers? They are not defined. The input voltage is listed as 480 VAC on page 5 of 18 and 120 VAC on page 6 of 18. The listed part number for the LHF Array Power Line surge suppressor implies 120 VAC line to ground which is incorrect if the circuit is 480 VAC. Please clarify the Array Line input. Answer 5: The shelters are to be designed for land use only, however, they will be used in the mid-Atlantic seaboard area which has a salt atmosphere. The only mechanical design criteria applicable is for transportation loads. Commercial standards are to be used for this criteria. Clarification of "ADDITION OF A SURGE SUPPRESSOR......." in paragraph 2.For reference, the array power exits from an isolation transformer (rated at 150KVA, 480 Vrms, input, which is not part of this procurement) at 208Vrms. At rated power the output current is 240ARMS per phase and is expected out on 3 6awg twisted pair. Question 6: On page 6 of 18: The title "Surge Suppressor and EMI Filter: etc" implies that the ITD of Destin part is a surge suppressor and also a power line filter. The units do have capacitors to ground which may be adequate for this application. Should we be quoting power filters in addition to the suppressors? Answer 6: Remove the words "and EMI Filter," no filter is required, therefore none has been specified. Question 7: Should the ECU be sized based on the "Mid-Atlantic Seaboard" environment or for the operational temperature specs in paragraph 21? Should the unit be equipped with Hot gas bypass to eliminate power surges from the compressor startup as well as improved reliability? Answer 7: The ECU can be sized based on the Mid -Atlantic Seaboard environment or specification 21as long as it meets our minimum requirement of 5 ton AC and humidity control for that environment. Surge protection is not an issue because the ECU power is a separate line protected by an isolation transform elsewhere on the base. Question 8: Paragraph 20 -- How is EMI shielding provided for the coolant and compressor lines? Do we provide a blank shielded panel for your installation of these items? Answer: 8 NRL will install the coolant and compressor lines in the blank shielded panel built for the shelters. Question 9: Should we assume this unit to a shipboard operation? If so, we need to configure the ECU for salt atmosphere to include the high "G" loads and high pitch encountered at sea. Also, if the unit will be exposed to "green water", it will require specialized features. Answer 9: The shelters will not be used shipboard, however, they will be used in Mid-Atlantic Seaboard conditions. Question 10: Will we be required to perform EMI shielding verification testing? If so, will all units be tested or just the first article? Answer 10: EMI verification testing is not required, however, proof of a proven design is required and will be reviewed. Question 11: Do prototypes of the specified shelters (or similar shelters) exist? If so, who manufactured then? Are they available for inspection? Answer 11: No prototypes exist. Question 12: The spec calls for "ISO Type" shelters: Does the "ISO" refer only to the corner blocks and overall dimensions, or do other ISO/CSC requirements apply? Is CSC certification required for the finished shelters/; will ISO/CSC minimums structural design criteria apply?; will the shelters ever be stacked more than two high in transit? Answer 12: NRL's reference to ISO pertains to the corner blocks and the ability to easily stack units. CSC certification is not required, however as far as structural design criteria are concerned NRL will accept "commercial standard" which meets or exceeds our specifications. The shelters will never be stacked more than 2 high. Question 13: Is there any requirement for air transport? Will the shelters be used aboard ships or barges? Answer 13: There is no requirement for air transportation nor will they be used on ship or barges. Question 14: What is the maximum gross weight of the shelters (1) when loaded and stationary, and (2) when loaded and being moved? Answer 14: The maximum content weight of the shelters when loaded and stationary is 8000 pounds. The maximum content weight of the shelters when loaded and being moved is 8000 pounds. The idea weight would be able to truck ship two units on one trailer without special permits for weight or size. Question 15: What is the center of gravity of 1500lb weight attached to the angled end of the shelter? Will this load move (translate or rotate) and if so, what accelerations are applied, where are they applied, and what mass is involved? Answer 15: The center gravity is approximately two feet into the trailer from the pallet and within an envelope 2 feet from the side walls, floor and ceiling. The load must not move. Question 16: Is the 500lb-rack load referenced in spec item #15 for the entire rack or for each 2-foot section? Answer 16: The 500 pound rack load is the entire weight of one rack and its content. Question 17: Please confirm the EMI requirement of 60db attenuation applies to the full frequency range down to 150Hz. Typically, EMI attenuation for military shelters is 60db for 1MHz and higher, dropping to 40db at 150kHz. The more stringent requirement in your solicitation is a major cost driver for design, materials, and especially testing. Answer 17: The lower limit of the EMI requirement is 150 kHz and is confirmed as 60 dB through 10 GHz (preferably 18 GHz). The due date for offers is extended to September 17, 2001.=20

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Record

Loren Data Corp. 20010914/66SOL008.HTM (D-255 SN50X3N0)