Q and A - Solicitation N0016723Q0273 Proof of Concept Qualification Testing.docx

Solicitation N0016723Q0273 Proof of Concept Qualification Testing Questions and answers

1. Q: In order for us to do costing we need to do sizing of the components like pump, heaters etc. Do you have dimensions of the heat exchanger. We need specifically inlet and outlet diameters.

A: The test article is about 5” diameter at its widest and about 3.5” diameter at the cold outlet where it would fit up to the test loop. The total length of the exchanger would be roughly 19 inches.

2. Q: In order for us to do costing we need to do sizing of the components like pump, heaters etc. Do you have dimensions of the heat exchanger. We need specifically inlet and outlet diameters.

A: The heat exchanger type is shell and tube. Hot inlet and outlet are both ½” schedule 80 pipe (0.84” OD, 0.55” ID). The cold inlet has an ~1.25” OD and 0.98” ID and the outlet for the cold section is 3.5”.

3. Q: How much energy is expected? Or what outlet temperatures would we expect? Critical in sizing the heater and chiller and very dependent on internal heat exchanger geometry, can you share some information?

A: Here are some of the estimates from models run on this type of exchanger geometry:

(BTU/hr)

5 GPM

(~2500 lb/hr)

(~10,000 lb/hr)

1 GPM

(~495 lb/hr)

(~10,000 lb/hr)

4. Q: Welded copper/nickel piping (I penciled it out at 3/4in hot side, 1-1/2in cold side, may want to upsize for quoting purposes). Weld in-house?

A: Correct! The cold side should be upsized to as much as 3’’ to make sure all possibilities are captured.

5. Q: What are the heat exchanger interfaces? Assume ANSI flanges? Weld in place?

A: Flanges are typically per ASME B16.5, specifically ½” – class 900 for the hot-side and 1” – class 150 for the cold-side would be very conservative for the conditions imposed in this testing. Any fittings that have been used for our test were in accordance with ASME B16.9. All are welded into place, yes.

6. Q: Accuracy requirements for flow/temp/cycle time/salinity? I’d assume pretty rough accuracy (±5%?) on all of the above.

A: 5% will be sufficient, yes.

7. Q: Reporting requirements for the above? I’d assume something along the lines of a person looking at a gauge and filling in a control chart once per day.

A: Yes, the monitoring can be that simple just to demonstrate that the setup was controlled daily.

8. Q: How carefully do we need to visually inspect every month? I’d assume check entire length of every channel.

a. How many channels and how big? ..might need to ask, hard to guesstimate. WAG: assume that a standard Ø.31in probe can fit and there are ~100 channels x 24in to check.

A: That seems reasonable, yes. We want to ensure that all internal surface area is observed at least once and that photo/video evidence is collected for later analysis, if possible.

9. Q: Inspection methodology? Assume a simple, qualitative inspection.

A: No specific method is needed upfront – this can be determined in collaboration with NAVSEA as long as the internal surface area is all observed by the probe monthly.