BIDDERS QUESTIONS.pdf

BIDDERS QUESTIONS:

I. The following Bidder Questions and Answers shall be considered the following when submitting proposals for solicitation N4215826QE023 – Purification System.

Q1. We need to know the volume of air that is required for the amount of supplied air respirators? Filtration and compressor are sized based on the amount of airflow needed downstream. If you can tell us what type of respirators and how many, we can size the system using this information?

A1. While we need to meet the requirements of breathing air to use in case of an emergency, we do not actually use the system to provide breathing air on a day to day basis. The dew point is the critical number we care about, as that will affect the reliability of our equipment downstream of the filters.

Q2. Does the yard need compressor and filtration packages or are they using yard air in conjunction with filtration?

A2. For flow rate, we tie in the filters downstream of a compressor which the specifications state produce approximately 100 m^3/hr. If the filters cannot keep up with that flow rate, that is fine because we only use the system to refill our storage volume. It would just take longer to refill our storage volume. Based on our actual run times, our compressors produce approximately 0.4 CFM at 4500 psi.

Q3. Are there any power requirements or any other specifications we need to be aware of? i.e. intrinsically safe, required remote alarms, points of attachment for distribution of air, etc.?

A3. We already have high pressure air compressors, both portable and stationary to use. We just need filters to tie in between the compressors and our equipment to meet the more stringent dew point specification.

Q4. Page 4 of 28 calls out for Grade “E” air but lists the specifications for Grade “D” air. The only exception being the Dew Point which is Grade E standard (SCBA). We highly recommend against desiccant (that dry of air) being used to supply constantly flowing airline respirators. It will dehydrate workers and could cause symptoms such as sore throat, dry or bloody nasal passages, and dry eyes?

A4. Our current filters do not require any power. If needed, we will be able to provide 120V or 440V power. The filters are not used in any sensitive areas and have no special requirements for safety.

Q5. What pressure rating do you require?

A5. Our compressors produce a maximum of 5000 psi and we have relief valves in the system to protect at that pressure. The filters would need to be built to withstand 5000 psi and are regularly used at 3000-4500 psi. Our current filters have a ½” 37 degree flare male connection on the inlet and outlet. Each filter is only used to provide 1 outlet using a single compressor as the inlet.

Q6. Airflow Requirements: Could you please provide the type and number of respirators that will be used, so we can calculate the necessary airflow and size the system accordingly?

A6. We do not use the filters for respirators. See previous response for explanation with estimated flow rate calculations.

Q7. Air Supply Source: Kindly confirm whether a dedicated compressor and filtration package is required, or if existing yard air can be used in conjunction with additional filtration?

A7. We just need filters. We already have compressors at the shipyard. These filters are used between the compressors and our equipment. See above for further explanation.

Q7. Additional Specifications:

o Power requirements for the system o Whether intrinsically safe equipment is needed o Any need for remote alarms o The number of distribution points for air supply o Any other site-specific considerations we should be aware of

A7. We don’t have any power requirements. We can provide 120V and 440V power if needed but our current filters do not require power. We just need one inlet, one outlet, and no alarm, etc. required. See above for further explanation.

II. All other terms and conditions remain unchanged and in full effect.