A00002_-_Questions_and_Answers.pdf

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Amendment 00002

Questions and Answers Q1: Page 11 of the RFP, under Marking, refers to “overhauled motor” we assume new motors are required?

A1: Only NEW motors will be accepted

Q2: Page 14 of the RFP requires delivery of the FAT report 21 weeks ARO, page 20 of the RFP requires delivery of the FAT report 161 calendar days (23 weeks) ARO.

A2: 21 weeks

Q3: Specification Section 3.2.1 b. requires the cyclone separator to remove particles > 6 microns diameter, a cyclone separator does not separate based on size.

A3: The intent is to have a two stage filtration system to get down to 5 microns.

Q4: Is the intent to have one motor control center per RO unit? Section 3.1.1 state there shall be two identical RO units co-located on a single skid (i.e. the RO plant).

A4: Yes

Q5: As a matter of clarification we assume the intention is for the water at the end of the pretreatment train to be filtered down to 5 microns. We expect the strainer to be in the range of 500 microns.

A5: Concur

Q6: Utilities – How much power/energy is available for the Heater? Do they have Hot Water and/or Steam or does the heater have to be electric?

A6: 225’ & EAGLE both have 440V available.

Q7: Strainer – It is mentioned that the strainer is supposed to be 5micron which is odd, check with them if this is a typo? Also ask them to advise the required material for the strainer.

A7: See A3 & A5.

Q8: Membrane Cleaning – It is mentioned under the alarm conditions that an alarm is required for membrane cleaning, however there is no requirement for membrane cleaning system (a.k.a. clean in place system). Is this required?

A8: No automated cleaning system is required. Cleaning will be performed manually when the alarm is activated.

Q9: ISO 4406 seems to apply to hydraulic fluids. Please confirm that the application of this standard to the reverse osmosis system is requ ired.

A9: Concur, ISO 4406 does not apply to this system. Reference shall be removed from requirement by deleting the last sentence in section 3.3.1.d and removing ISO 4406 from the Reference List.

Q10: Please confirm the 5 micron rating. The 5 micron rating is too small for the first step in the filtration process.

A10: Concur, the 5 micron requirement does not apply to the strainer as this function is performed by the filters required in 3.2.1.c. In Section 3.2.1. “and pre-filtration of the incoming feed seawater to 5 microns” will be removed.

Q11: Please provide additional information on the raw water supply requirement. The requirement is not clear.

A11: The intent of this requirement is to obtain an RO capable of taking suction from a sea chest at a distance resulting in 35 feet of head loss.

Q12: One section required indication in GPM, the other GPH. Please advise which is correct.

A12: Concur, specification should be consistent with units; desired solution is Flow Meters displaying GPM. In section 3.2.3 “hour (GPH)” will be replaced with “minute (GPM)”.

Q13: Section 3.1.2/Table 1 - WHO Drinking Water Standards - A close review of the entries in this table is suggested. Some examples - Chloride instead of Chlorine, Fluoride instead of Fluorine.

A13: Concur. The exact same table online was unable to be located, however everything found in WHO and EPA referred to Fluoride and Chloride vs. Fluorine and Chlorine. All other Constituent Ions/Molecules listed in Table 1 are found with similar limits on WHO and EPA and are believed to be acceptable.

Q14: Section 3.1.1 Item #1 refers to a drain to permit media replacement. In section 3.2.1 that covers Pre-filtration, there is no mention of a multi media filter in the specifications.

Please clarify.

A14: The intent was to provide the ability to drain and clean out the pre-filter.

Q15: Section 3.1.2 refers to the water quality standards and indicates that a pH of 7.5-8.5 must be achieved. To accomplish this, a post treatment calcite system would be required. No post treatment system is mentioned in the specifications. Please clarify.

A15: The 3.1.2 chart represents the range of values.

Q16: Various sections in the specifications refer to measuring permeate and concentrate flow in gallons per minute (GPM). Section 3.2.3 call for product and reject water flow to be measured in GPH (gallons per hour).Please clarify.

A16: See A12

Q17: Section 3.1.5.l call for a fresh water flush inlet of 19gpm. This exceeds the capacity of the membrane. Please clarify.

A17: The fresh water system currently provides 20GPM.

Q18: Section 3.2.9 concerns the raw water supply. Does the access to the sea chest have a flooded suction at all times?

A18: Yes.

Q19: 3.1.1-1. General Requirements. This section references the ability to drain the filter vessels to permit filter media replacement. Our confusion is that there is no mention of media filters in the specific requirements of the system. The two units currently on the Eagle have media pre-filtration systems. Was a media system anticipated in the installation of these systems?

A19: The intent was to provide the ability to drain and clean out pre-filter.

Q20: 3.2.1-a. Strainer. The plant is to be equipped with a duplex strainer to remove large particulate matter from the seawater. A sea strainer is a normal part of an RO plant. The next part of the requirement is confusing. The strainer requirement also references pre-filtration down to 5 microns. I believe that the differential pressure gauge and 5 micron section of this requirement should be in section 3.2.1-c. Can you clarify this?

A20: Concur.

Q21: 3.2.1-b. Cyclone Separator. We can provide this if you really want it. This is a system that sounds good in theory but fails to provide more than a minimal amount of filtration. A media tank is far more effective. Your design specifies that the cyclone separator be designed to remove suspended solids with a specific gravity greater than or equal to 2.7.

The silt, dirt and suspended organics in seawater have a specific gravity smaller than 2.7.

With this system the 20 and 5 micron filters provide the bulk of the filtration. We would recommend that you consider a media filter rather than a cyclone separator. This requirement appears to be taken from an old system. Please advise how to proceed.

A21: The plants shall be equipped with cyclone separator or filter designed to remove suspended solids with a specific gravity ≥ 2.7 and a diameter ≥6 microns.

Q22: 3.2.2-a. Heater. Do you have more specific information on the type of heater requested?

Are you looking for a heat exchanger? We need to know what power or heat source is available in order to complete the design.

A22: 225’ & EAGLE both have 440V available.

Q23: 3.2.3-a. Product & Reject Flow Meters. Per this requirement the flow meters are to measure flow in gallons per hour (GPH). Section 3.1.1-6. Indicates that the permeate flow (same as product) is to be measured in gallons per minutes (GPM). For units of this size standard flow meters are GPM. We need clarification.

A23: The meter should measure GPM.

Q24: 3.2.4-a. Remote Control and Monitoring. The system is required to provide remote monitoring and terminal point connection to operate the system dump valve. Is the dump valve control separate from the monitoring system or can it be integrated into the remote monitoring system? Does the remote monitoring system need to have an emergency stop function?

A24: The dump valve can be integrated into the remote monitoring system and may have an emergency stop function.

Q25: 3.2.9-a. Raw Water Supply. We have assumed that the feed pump will need to be mounted on the same skid as the RO unit. However, best design would install the feed pump as low in the vessel as practical, but at a minimum below the water line. The requirement that “the plants shall be capable of a 35 feet head loss in the suction from a sea chest while maintaining the required raw water inlet pressure and flow “ is confusing. If the feed pump will be mounted at or below water line and the RO unit may be 35 feet above this works.

Our reading of the requirement indicates that the plant will need to be able to create a suction of 35 feet head loss. This is not a possibility. Water cannot be pulled more than

33.9 feet. I’m sure were reading this incorrectly. Could we have some clarification on how you would like the feed water to flow to the RO unit?

A25: Suction should be 15 FT on EAGLE. 225’ raw water supplied at a flow rate in the range of 15 to 30 GPM; with a normal operating seawater pressure of 35 PSI and maximum seawater pressure of 50 psi.

Q26: 3.2.16-c Centrifugal Water Pumps. What is meant by recirculation capabilities? Is this the recirculation loop for the membranes cleaning system?

A26: No. The intent is for pressure relief.

Q27: 3.3.1 Technical Data. As part of our proposal we will provide general drawings of our equipment with the expectation that we will be able to modify the arrangement to better integrate the unit into the design of the vessel. Is this acceptable?

A27: The unit’s dimensions should not exceed the requirements listed in paragraphs 3.1.4 and 3.1.6

Q28: The sea strainer item # 3.2.1-a indicates that the plant shall have a duplex strainer. I assumed that meant a sea strainer with a strainer made from duplex stainless. Our engineer thinks it is a strainer designed with two baskets in the same unit that can be isolated for continuous flow while cleaning. This is also called a duplex strainer. Can you clarify this?

A28: It is a strainer designed with two baskets in the same unit that can be isolated for continuous flow while cleaning.

Q29: 3.1.3 225’ WLB RO Plant Operational Requirements b. Total Generating Capacity: at a minimum, generate a total of 4,000 GPD of potable water with salt concentration < 500 ppm, made up of two (2) identical units.

c. Minimum raw water temperature: 28 F.

d. Maximum raw water temperature: 113 F.

Is the plant required to generate a minimum of 4,000 GPD of potable water over the entire raw water temperature range? If not, what raw water temperature should be used for performance normalization?

A29: Under ideal conditions the unit should be capable of producing 4,000 GPD @ 25 degrees Celsius.