Vendor Questions and Answers 1 of 1.pdf
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- Solicitation number
- W9127N22Q0140
About this file
This document contains a solicitation for the refurbishment of four sets of thrust bearing oil coolers for The Dalles Lock and Dam. The U.S. Army Corps of Engineers, Portland District is seeking quotes for the refurbishment work under CLINs 0001 through 0004, with a delivery date of 90 days after contract award to the dam site. The solicitation is set aside for small businesses only under NAICS code 332410 for power boiler and heat exchanger manufacturing with up to 750 employees. Quotes are required to include the provision for offeror representations and certifications for commercial items.
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Q1: The extruded aluminum have advantages over copper edge tension wound because the copper fin will delaminate over time, whilst the extruded aluminum are a solid piece of aluminum. I have attached a brochure on our fin tube. Can you have your engineer looks at this information and approve extruded aluminum fin tube?
A1: Aluminum has at best 60% of the thermal conductivity of copper, at worst 40%, and we just don’t have room in the thrust tub to increase the surface area to make up the difference.
Q2: What is the maximum temperature of the system?
A2: I believe the operating temperature was specified in the advertisement package. I can track it down if not.
Q3: Do the fins need to be solder dipped?
A3: Yes, the fins should be soldered. I didn’t realize unsoldered was an option, or I would have specified.
Q4: There are six intermediate supports in each cooler half, to which support(s) are the test coupons to be mounted near?
A4: Looking from the outside, it will be the support, just to the right of center.
Q5: Do the four test coupons need to be part of one of the outer most tubes, or one test coupon in each of four different outer most tubes?
A5: One in each of the four outer most tubes.
Q6: Are metal ferrule compression fittings acceptable for the test coupon connections?
A6: Yes.
File details come from the government source that posted it. Updated .