E -- CONSTRUCTION OF AN RF EMI SHIELDED ENCLOSURE

Notice Date

April 26, 2001

Contracting Office

Naval Research Laboratory (NRL-SSC), Attn: Code 3235, Building 1007, Room 44, Stennis Space Center, MS 39529-5004

ZIP Code

39529-5004

Solicitation Number

N00173-01-R-JR04

Response Due

May 7, 2001

Point of Contact

Jerry Riles, Contract Specialist, (228) 688-4259

E-Mail Address

click here to contact the contract specialist via (jriles@hawkeye.nrlssc.navy.mil)

Description

This is an amendment to combined synopsis/solicitation number N00173-01-R-JR04 dated 06 April 2001, issued by the Naval Research Laboratory for Construction of an RF EMI Shielded Enclosure. This amendment is issued in response to questions against the Statement of Work which is available via NRL's web site at: http://heron.nrl.navy.mil/contracts/rfplist.htm. 1. Question: Section 3, SCOPE "Installation of Pneumatic Thermostat (GFE)". Please provide literature for installation procedures of this item. Answer: The pneumatic thermostat designated for use in the shielded enclosure is a standard Honeywell type TP970 unit. This unit attaches to the wall in a typical installation with 4-40 by 1.5" bolts. 2. Question: Section 3, SCOPE "Powerline Filters are GFE". Who is to remove the Powerline Filters (GFE) from the existing shielded enclosure in building 209 for re-use in the new enclosure? What will happen if one of these items is found to be defective? This will not be apparent until the Certification Test is made at which time an additional test visit will be required to verify the replacement filter. Answer: The power line filters are less than three years old and have been recently validated for proper operation during tests on the existing enclosure. The power line filters will be removed from the existing enclosure by the contractor personnel performing the installation of the new enclosure. 3. Question: Section 3, SCOPE "Lighting- 18 each 180 Watt incandescent light fixtures". We have no experience with a 180-watt fixture. Please provide a recommended manufacturer and part number. Answer: The 18 light fixtures will each accommodate two 100-Watt incandescent light bulbs and be capable of dissipating their heat for continuous operating conditions. 4. Question: Section 3, SCOPE "Copper ground bus bar with ground stud on 3 sides of the enclosure". Figure 1 on page 4 of the Statement of Work depicts an entry door on two different walls. Can you provide a linear foot quantity for the bus bar? Answer: The copper ground bus bar will run 56 linear feet around the perimeter of the room, except for the short span of wall containing the door on the east wall of the shielded enclosure as depicted in Figure 1. 5. Question: Section 5.1.4, Contractor Furnished Equipment (GFE) -- This section makes reference to supplying cranes. Is Room 127/131 not located on the ground level of your facility? Can a description of the building egress route from the loading dock to room 127/131 be provided? Can structural steel sections 12 ft in length be handled to room 127/131? Answer: Room 127/131 is approximately 58 inches above the outside ground level. Primary access to room 127/131 from the outside is through the double doors shown on the east side of Figure 1. A flight of eight steps must be ascended to reach the threshold at floor level in room 127/131. The opening for these double doors is 70 inches wide by 82 inches tall. A loading dock with a pneumatic lift is available in an adjoining building connected by a corridor at the floor level of room 127/131. The doorways in this corridor have a minimum clearance of 60 inches wide by 76 inches tall. The contractor shall furnish all other lifts, cranes, and dollies needed to unload and transport the materials for the construction of the shielded enclosure from the delivery truck to the interior of room 127/131. The contractor shall also furnish all ladders, lifts, hoists, and other construction devices needed to assemble the shielded enclosure inside room 127/131. 6. Question: Section 5.3.1, Electrical Power This section makes reference to an isolation transformer. Is this equipment required for this enclosure? Answer: This shielded enclosure will not require a contractor supplied isolation transformer for operation. The contractor may wish to use such a device during certification testing. 7. Question: Section 5.5, Doors -- This section refers to the submittal of evidence by test report that the doors are compliant with the shielding specifications. Is it correct to assume that the doors are to be factory tested for shielding integrity prior to shipment? Or will documentation from other doors previously manufactured be sufficient to confirm the basic door design will conform? Answer: Compliance of the door shielding capability will be documented by test results used to qualify and prove the design chosen for this application. Documentation of test results for other specific items of the same door design will satisfy this requirement. 8. Question: Section 5.6, RF Connector Panel There is reference made to a removable section which will be GFE. Does this item meet the required shielding effectiveness of this facility? Similar to the Powerline Filter situation, this will not be confirmed until the certification test is made. Shall a solid removable panel be used during the certification test in case this item does not perform? Answer: The existing connector feed through panel has been verified to meet the shielding requirements during numerous tests conducted in the existing shielded enclosure in building 209. A solid panel may be substituted during certification testing only if approved by the procurement originator. 9. Question: What are the available work hours at the proposed site? What kind of background information will be required for site personnel, if any? Answer: The contractor shall comply with the NRL Requirements for On-Site Contractors dated 8 December 2000 which will be incorporated by reference in the contract. The full text is available at http://heron.nrl.navy.mil/contracts/home.htm. Original and two (2) copies of the Offerors proposal must be delivered to Contracting Officer, Bldg. 1007, Rm. 47, Naval Research Laboratory-SSC, Code 3235:JR, Stennis Space Center, MS, 39529-5004, and received no later than 4:00 p.m. E.S.T. on 07 May 2001. For more information regarding the solicitation and amendment, contact Jerry Riles, Contract Specialist at (228) 688-4259. Synopsis number JR04.

Web Link

click here to download a copy of the Statement of Work (http://heron.nrl.navy.mil/contracts/rfplist.htm)

Record

Loren Data Corp. 20010430/ESOL001.HTM (W-116 SN50K3N1)