Questions and Answers corrected.pdf

SENSITIVE BUT UNCLASSIFIED

Questions & Answers Solicitation for Boiler Replacement Services, Riga, Latvia

19LG7526Q0001

Question 1: What kind of insurance needed, local or DBA.

Answer: Local insurance is required. Our post has a DBA insurance waiver.

Question 2: When should we start the installation work?

Answer: It may take approximately one month to issue the award. The timeline will also depend on how quickly the security clearance is completed, which typically takes between ten days and two weeks. At this time, it appears that the project would begin in June. The project must be completed within 60 days.

Question 3: What kind of BAS system would we prefer and what this BAS would control?

Answer: The government does not require a particular brand BAS for the boiler room. BAS will serve only for controlling/supervising the boiler room and the sensors installed in the mechanical room and it will give the signal to the building BAS stating setpoints and actual readings. The boiler room BAS will operate independently and will not be controlled by the main building BAS.

Question 4: What BAS system protocol should be used?

Answer: Modbus TCP protocol should be used.

Question 5: Where would be the designing border?

Answer: The heating system from the boilers to the secondary pump pressure lines is the redesigning margin. In other words, we are redesigning from the boilers through the secondary pressure pumps.

Question 6: What is the size and location of breakers?

Answer: There are 25-amp, three-phase breakers supplying power to the boilers. The remaining equipment is fed from a separate panel. The panels are located to the left of the boilers.

Question 7: According to which standard should the electrical work be performed?

Answer: All wiring shall be installed in conduits in accordance with U.S. standards. The Embassy will provide the necessary materials and, if required, training on the proper use, bending, and installation of conduits.

Question 8: What boiler standards are we looking for?

Answer: We are looking for EU standards. It is also essential that the boilers and their spare parts are readily available on the market and can be maintained by local companies.

Question 9: What kind of burner are we looking for?

Answer: A modular burner with electrical pilot flame ignition is required.

Question 10: Gas line

Answer: The contractor will need to adjust the gas lines according to new boiler connection location, pressure and other parameters. The pressure regulator, pressure gauge, and other parts should be replaced, if needed.

Question 11: Flue pipe

Answer: The flue pipe should be replaced if needed, based on the boiler flue pipe diameter and location.

Question 12: Pumps

Answer: Primary and secondary pumps should be available locally and serviceable by local companies. They should be controlled by Variable Frequency Drive (VFD).

Question 13: Piping

Answer: The size of the piping should be calculated by the company according to the heating system parameters.

Question 14: We kindly request the following documents:

1. Boiler room as-built drawings

2. Photos of the existing boilers and other equipment

3. Site visit photos

Answer: Our security regulations preclude us from providing photos or posting as-built drawings on a public website, which is why we hosted a site visit..

Question 15: Can you please send the whole boiler plant`s P&ID diagram of Mechanical systems ? On P&ID it would be good if You could mark the borders of reconstruction.

Answer: Our security regulations preclude us from providing photos or posting detailed systems diagrams on a public website. Please see the below abbreviated diagram, which is all we can provide at this time.

Question 16: To what norms should one stick concerning flue gas emissions - EU or USA?

Answer: EU

Question 17: Will the boilers work in a cascade mode or separately?

Answer: They should operate in cascade mode, switching the lead boiler weekly.

Question 18: We advise you to change the chimneys amidst all the boiler-plant`s reconstruction.

Answer: You may include this in your proposal, depending on the Boiler specification. We do not exclude or prohibit such operations.

Question 19: Please specify - to whom do we turn with all the questions- to potential general contractor , in our case MEPTEK, or straight to the EMBASSY ? < Riga- ProcurementSection@state.gov> ?

Answer: This detail should be worked out with your primary contractor. At the kick-off meeting, we will establish standard operating procedures for questions that arise.

Question 20: When is the deadline for those Submittals as below -

Answer: The deadline for the listed submittals is March 18, 2026 by 2 p.m. (14:00 Riga time).

Question 21: My question is, if we submit proposal on behalf of XXX, which is registered entity, but all qualifying documents will be submitted about the sub-contractor. Should it work like that?

Answer: Yes, the proposal can be submitted by company XXX. Qualifying documents may be provided for the subcontractors; however, insurance, bonds, invoices, points of contact, and other managerial responsibilities must come from company XXX.

Question 22: Could you please provide a photo of the existing PID? (should be located on the wall in the boiler room).

Answer: Refer to answer to question 15 of this document.

Question 23: Could you please provide photos of the data plates (nameplates) of the existing circulation / network pumps?

Answer: Our security regulations preclude us from providing these photos on a public website, but see the below for information from the nameplates.

Question 24: Could you please confirm the existing chimney diameters and advise whether there are two chimney units installed?

Answer: The existing chimney diameter is ID 300 mm. It goes 6 meter above the roof. There are two chimney units installed.

Question 25: Could you please confirm whether domestic hot water (DHW) preparation is included within the scope of the existing system?

Answer: No, domestic hot water is not under this solicitation. Only heating hot water is.

Question 26: Could you please provide the following gas supply information: Gas pressure before the gas meter; A photo of the gas meter; Gas pressure at the existing gas burners.

Answer: The gas pressure before the gas meter is 2.8 to 3bars. The gas pressure after the gas meter and pressure regulator but before the burner is 0.42 Bar. The gas pressure at the burner is 0.7 inches of water or 1.74mbar.

Gas meter:

Gas meter corrector:

Question 27: What is the length and internal diameter of the chimneys?

Answer: Please see Question 24.

Question 28: Have the technical conditions (technical approval/specifications) for replacing the gas boiler equipment been received? Please provide them.

Answer: The principal requirements are laid out on page 47 of the solicitation under Scope of Work:

• Nominal thermal output (per unit): 630 kW (vendor to state exact nominal, maximum and minimum outputs).

• Thermal efficiency: Guaranteed ≥ 92% at nominal conditions (provide test/certification).

• Design: Floor-standing steel construction, reverse-flame configuration suitable for hot-water heating plantrooms.

• Coordination / shop drawings: Provide mechanical room layout drawings to match new parts, systems and fittings.

• Fuel flexibility: Dual-fuel capable — natural gas and light oil (diesel/#2). Provide fuel switching methods.

• Modular Burner performance: Dual-fuel low-NOx burner integrated with boiler;

guaranteed to meet low-NOx class 3 on gas and class 2 on light oil. Burning efficiency control O2 trim.

Question 29: Is there a project/design available for the replacement of the heating equipment?

Answer: The bidder should propose the design for the replacement equipment.

Question 30: How many heating circuits do the existing heating boilers need to serve (and what types are they)?

Answer: There are two circuits, primary and secondary.