S05 RFIs-36C24220B0062 Responses.pdf

36C24220B0062

Project#561-18-180 Correct FCA D&F Deficiencies Boiler Plant

RFIs

1. Will off hours work be required for new tie-in to the high pressure steam main? What is the proposed time wind?

Response: Off hours work should not be required to connect the new PRV-1 to the existing valve. If the existing valve does not hold, then an off hour, maximum 4-hour duration, steam shutdown would be required.

2. Will off hours work be required for the tie-in of temporary blowdown piping? What is the proposed time window?

Response: Off hours will not be required for tie in of the temporary blowdown piping.

3. Will off hours work be required for the tie-in of new blowdown piping with the existing sanitary? What is the proposed time window?

Response: Off hours will not be required for this work.

4. Drawing E-601: Please clarify whether the new 600A, 208/120V 22KAIC MDP & 600A, 208/120V

22KAIC DP-EM are just panelboards or switchboard?

Response: Both can be distribution panelboards provided that each can satisfy the requirements of the project drawings and specifications. MDP must contain a digital multimeter per notes and distribution switchboard specification.

5. The temporary distribution panel NEMA 3R 600A bus indicated as 480V/277V rated whereas the temp generator feeding this panel indicated as 208V/120V rated & the system voltage in boiler plant is only 208v/120V please clarify which is correct?

Response: The temporary distribution panel shall be rated 208/120-volt.

6. Spec section 01 45 00 para 3.4 states to have a CQC system manager as one of the personnel requirements. Please clarify if this CQC system manager will be a full-time personnel and whether contractor’s site supervisor can simultaneously perform the duties of this CQC system manager? Also please clarify if there is any other full time personnel required to be hired by contractor for this quality control work, there is an extensive spec section with requirements so please clarify in detail.

Response: The contractor’s supervisor may simultaneously perform the duties of the CQC

System Manager. No other full-time personnel are required for this quality work.

7. Spec section 02 82 11 para 1.1.2.B states approx. 100 linear feet ACM door frame caulk. Drawing

ABT-1 and ABT-2 key note no.1 indicates only three ( 3 ) door frames. Please confirm this count is correct.

RFIs

Response: The count of (3) door frames is correct.

8. Drawing S-501 details 10 and 11 indicates Concrete spall repairs and also has detailed spall repair notes. Please identify this work of concrete spall repairs on the plan/drawings sheets or provide quantities.

Response: The intent is to repair any and all areas of spalling that are revealed when the trench covers are removed. Contractor should assume that details 10 and 11 on S-501 will apply to the entire length of trench.

9. Spec section 02 83 33.13, Para 1.1.A1 states removing and disposal of lead-based paint at interior and exterior locations indicated in existing conditions report. – There is no report in the bid documents and no work shown on drawings and specs, please identify on the scaled drawings locations/areas of these lead-based paint or provide quantities, also Para 2 states to use chemical stripper, can this chemical stripper used for both the interior and exterior locations?

Response: Please see attached Regulated Materials Survey Report dated 2020-05-15 for potential locations of lead-based paint.

10. Spec section 03 54 16 is for hydraulic cement underlayment. – Please identify on drawings locations of this work.

Response: This is identified on Drawing A100. See Key note #4 in new IT Room.

11. Spec section 05 12 00 page 3, para 1.5 states AISC certified fabricator and erector is required. Is this correct and mandatory requirement?

Response: An AISC certified fabricator and erector is required.

12. Is the existing building roof under warranty? If yes, then please provide the name and contact of roofing contractor.

Response: The existing roof is under warranty. Contact:

Jeffrey A. Dorfler

Tremco Roofing - Mid Atlantic Region

8 Main Street

Flemington, NJ 08822

M: 908-616-6437

F: 908-316-7587 www.tremcoroofing.com

RFIs

13. Drawing SF-102 key note no.3 states to provide new fall protection railing on roof perimeter. Is there any basis of design or any specific manufacturer that VA would like to use?

Response: VA does not allow specific manufacturer or model numbers to be included on engineering drawings.

14. Drawing S-001 Finishes – Flooring note no.2 states ‘Contractor to cover floor with epoxy paint with scattered media’ --- Please provide basis of design or manufacturer’s name and correct name of the paint system.

Response: VA does not allow specific manufacturer or model numbers to be included on engineering drawings.

15. Drawing SF101 key note no.17 states to replace 11’ – 8” wide x 14’ – 0” ht interior rolling security grate. --- Please provide an elevation drawing and specification section for this work.

Response: Contractor to match existing security grate. Verify in field, and contact manufacturer for replacement.

16. Will the VA provide any utilities mark outs for the outside digging?

Response: No, contractor is responsible for all markouts.

17. Drawing M-501 Detail 11 Boiler Auxiliary Drain Piping asks to re-route them to new floor drain and replace pipe that is leaking or rusted, is any point of connection or starting point since that pipes are coming from different locations?

Response: Replace auxiliary drain piping back to the first union on all (5) boiler trim lines.

18. Scope of Work Item 4 A.7 , asks for 38 LF of safety railing and Drawing SF102 General Sheet Item

Number 2 ask for entire perimeter of roof to be covered, the total amount is more LF, please confirm total LF required.

Response: Provide new railings around perimeter of roof as shown on drawing SF102.

19. Drawing M-502 Detail No.4 shows Earthquake Automatic Shut Off valve, and Pressure Control

Valve, please provide specifications for both of them. Detail No 1 shows Steam Control Valve, please provide specifications.

Response:

Ref. Detail 1 on M502 - Provide steam control valve with steam unit heater. Provide line pressure regulator for liquid propane service from MAXITROL RV series or equal.

Ref. Detail 4 on M502 - Provide earthquake valve from NORTHRIDGE - Model M100 or equal.

RFIs

20. On insulation thickness charts, blowdown pipe (above ground and in trench is not included).

Please provide type, thickness and protection materials.

Response: Insulate blowdown piping outside of trench as noted in Specification 230711 Section

3.7 PIPE INSULATION SCHEDULE for operating temperature service range 122-177 degrees C

(251-350 degrees F). Blowdown piping within the trench is not to be insulated.

21. Specifications call for Forged Steel fittings Class 2000 for threaded pipes, since Class 2000 is not stock, is possible to use Class 3000?

Response: Yes, Class 3000 fittings are acceptable.

22. Drawing P-101 shows new 6" sanitary pipe running along new blowdown trench, is possible to have a trench section detail including sanitary pipe?

Response: See attached sketch.

23. Please verify the level to be maintained in the boiler deaerator tank (DA)?

Response: Match the existing deaerator operating water level – contractor to verify current operating level in field.

The D/A levels are determined by the plant steam loads, the deaerator manufacturer, VA Detail

SD232111-06 titled, “Feedwater Deaerator Flow Diagram” (attached) and tested using “VHA

Boiler and Associated Plant Safety Testing Manual”, fifth edition, page 44-46.

24. Are there any records as it pertains to the DA tank? It appears to us that the storage tank may be over sized; this level will be critical for the installation of overflow probe placement. With this type of DA the internal over flow stand pipe shows about 3.5 to 4” below top of tank; this pipe will have to be cut.

Response:

There are no known records or shop drawings of the existing deaerator.

Discussions regarding DA sizing are outside of the scope of this project.

Per “VHA Boiler and Associated Plant Safety Testing Manual”, fifth edition, page 44, the High-

Level Alarm setpoint must be below 2/3rds of the tank height, and the level at which the overflow valve actuates must be at least 4” above the high level alarm setpoint level.

Per “VHA Boiler and Associated Plant Safety Testing Manual”, fifth edition, page 46, the overflow setpoint must be at least 4” below the top of the tank.

RFIs

Per VA Detail SD232111-06 titled, “Feedwater Deaerator Flow Diagram” (see attached), the overflow standpipe must be 6” below the Low-Level Alarm setpoint. Contractor shall cut the existing standpipe if the overflow inlet is above this level.

Per “VHA Boiler and Associated Plant Safety Testing Manual”, fifth edition, page 45 the Low-

Level Alarm setpoint must be above 1/3 of the tank height.

Lmatesich Rectangle

Lmatesich Rectangle

Lmatesich Text Box Alarm set point is required to be 2/3 thirds of tank height and at least 4" below the level at which the the overflow valve actuates.

Lmatesich Rectangle

Checklist for High Water Alarm on Deaerator Tank (HWADT)

(For Steam Boiler System only) Item Make /

Model

Device

Type

Alarm Set point

DA Tank

Diameter inches

HWADT

*Alarm set point is required to be below 2/3rds of tank height & at least 4” below the level at which the overflow valve actuates.

*Alarm type is required to be a probe.

LWA

HWA (PROBE)

BUTTERFLY VALVE

SOLENOID ACTUATED

OVERFLOW PROBE

Steam

Makeup / Condensate

Vent

10 Psig 500-1000 lb/hr

Vac Breaker

Overflow

To Boiler

DASV

SVFPRV

Vent

DA TANK

PRV

Bypass Valve

MV

• Drain sight glass without draining alarm column and then quickly close drain valve. Water level should quickly rise in sight glass indicating good communication with tank.

• If poor communication, clean lines and begin with the step above.

• Use bypass valve to add water to the deaerator at a rate not to exceed 1 inch per minute. Use water level sight glass to observe point that alarm sounds. DO NOT ALLOW WATER

LEVEL TO LEAVE SIGHT GLASS

Result Y/N Water Level

Correct switch type and location?

Did the alarm work correctly? Record Water Level.

Did the device fail or pass the 3 Question Criteria (section 1.3.1)? Pass Fail

If boiler is to be operated with failed safety device, a properly approved ISM is required.

Describe safety device failure/remedy in Appendix F.

Checklist for Low Water Alarm on Deaerator Tank (LWADT)

(For Steam Boiler System only)

Item Make /

Model

Device

Type

Alarm Set point

DA Tank

Diameter inches

LWADT

*Alarm set point is required to be above 1/3rd of tank height.

*Device type is required to be a probe, float, or differential pressure sensor

LWA

HWA (PROBE)

BUTTERFLY VALVE

SOLENOID ACTUATED

OVERFLOW PROBE

Steam

Makeup / Condensate

Vent

10 Psig 500-1000 lb/hr

Vac Breaker

Overflow

To Boiler

DASV

SVFPRV

Vent

DA TANK

PRV

Bypass Valve

MV

• Drain sight glass without draining alarm column and then quickly close drain valve. Water level should quickly rise in sight glass indicating good communication with tank.

• If poor communication, clean lines and begin with the step above.

• Use bypass valve to add water to the deaerator at a rate not to exceed 1 inch per minute. Use water level sight glass to observe point that alarm sounds. DO NOT ALLOW WATER

LEVEL TO LEAVE SIGHT GLASS

Correct switch type and location?

Did alarm work correctly? Record water level.

Checklist for Deaerator Overflow Drain System (DAODS)

(For Steam Boiler System only)

Item Make /

Model

Device

Type

Overflow

Setpoint

Tank Diameter inches

DAODS

*Overflow system is required to be a conductivity probe or differential pressure sensor connected to electronic valve that is not used in level control.

*Setpoint is required to be at least 4” below top of tank. If overflow drains to condensate tank, the condensate tank is required to be properly treated as a pressure vessel.

LWA

HWA (PROBE)

BUTTERFLY VALVE

SOLENOID ACTUATED

OVERFLOW PROBE

Steam

Makeup / Condensate

Vent

10 Psig 500-1000 lb/hr

Vac Breaker

Overflow

To Boiler

DASV

SVFPRV

Vent

DA TANK

• Drain the sight glass and quickly close drain valve. Water level should quickly rise in sight glass indicating good communication with tank.

• Open manual bypass valve to supply feedwater at maximum rate.

• Determine that overflow valve has opened by using sight glass in drain line or visually observing drain. Use water level in sight glass on tank to observe whether overflow valve maintains water level visible in sight glass. DO NOT ALLOW WATER LEVEL TO

LEAVE SIGHT GLASS.

Correct device and location?

Did the overflow valve work correctly? Record Water level.

View port in place to view overflow?