4.01a Q&A for additional info.pdf
PDF 228 KB Posted
- Attached to
- MSC SHIP REPAIR VR
- Solicitation number
- N6817126QN020
About this file
This is a Questions and Answers document for a federal contract opportunity involving the supply and installation of guardrails for the USNS Arctic vessel.
The contractor must supply 8-foot and 16-foot W-Beams constructed from S355JR material grade steel at 12 gauge thickness, along with 4x4x7.5 T-beam posts. Guardrails are to be provided without pre-drilled holes; bolt hole locations will be determined during installation based on ship-specific conditions and reference drawings provided. Hardware requirements include 5/8" splice bolts/nuts, post bolts/nuts, and washers, all fabricated from Corrosion-Resistant Steel (CRES) as specified in the Statement of Work. Specific quantities and arrangements for hardware are detailed in the reference document, page 3. The material shall not be hot-dip galvanized; instead, guardrails must be finished with two coats of primer followed by one topcoat of safety yellow paint prior to installation. All specifications, dimensions, and arrangement details are available in the accompanying reference drawing and pictures of existing guardrails currently installed onboard the vessel.
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Text version
Q1. Material Grade for:
a. 8ft W-Beams
b. 16ft W-Beams
c. Flared Ends
d. "T" Steel Beams
Available materials: a. S235JR, b. S275JR & c. S355JR
A1 *MS: S355JR for T beam. Guardrails are required to be 12 gauge steel W beams, as stated in the
SOW.
Q2. Confirm for Posts you require "T" sections instead of "H" sections and provide:
a. Web Thickness
b. Flange Thickness
A2 *MS: 4x4x7.5 T beams, as indicated in the reference drawing.
Q3. For Guardrails provided by the Contractor, it is stated that they should be provided without holes;
and later on drilled.Given the fact that Guardrails will be Hot-dip galvanized, we would appreciate if you could provide the bolt pattern or design standard required for these guardrails. This will allow us to pre-drill the holes (normally oval shape) prior to installation, and without affecting the protective coating.
A3 *MS: Guardrail bolt hole locations are not standardized and vary to suit conditions of the ship. The arrangement details for the guardrails to be replaced are available in the reference drawing, as well as pictures of the current guard rails onboard (see attached). However, when originally installed they were cut and drilled onboard during installation.
Q4. Guardrail accessories, e.g. splice washers, splice bolts/nuts & post bolts, are not mentioned in your specification.Kindly please advise if MMS shall include the above as per common practice (i.e. 1x post bolt + 1x beam washer per post/connection & 8x splice bolts/nuts + 8x splice washers per post/connection)
A4 *MS: Details of the hardware needed are in the reference document, page 3. Splice nut/bolts are 5/8". Post nut/bolt/washers are 5/8". As stated in the SOW all hardware is to be CRES.
Q5. Section 7.5 of the Spec refers to blasting & coating of guardrails/frames/brackets, although Section
3.2 specifies material with hot-dip galvanized surfaces kindly please advise whether HDG is required on the requested material, as we can also supply them without HDG."
A5*MS: The guardrails should be painted with 2 coats of primer followed by one topcoat of safety yellow prior to installation
Please see the attached “USNS Arctic Guard Rails Exterior” file
File details come from the government source that posted it. Updated .