Michael Pacholok, Purchasing and Materials Management … · 2020-06-12 · Q3. In the refrigeration specifications item 2.27 COMPRESSOR OIL AND JACKET COOLING item 1 states “Deep

Michael Pacholok, Director

Purchasing and Materials Management Division City Hall, 18th Floor, West Tower 100 Queen Street West Toronto, Ontario M5H 2N2

Joanne Kehoe Manager Construction Services

August 5, 2016 Reply to: Michael Porcarelli Via Website Posting: 19 Pages Tel: (416) 338-5585

Addendum No. 2

Tender No. 109-2016

Re: Replacement of Refrigeration Plant, Pool Piping & Upgrades at Nathan Phillips Square

Located at 100 Queen Street West, Toronto.

Closing Date: 12:00 P.M. Noon (Local Time), August 12, 2016

Please refer to the above Tender Call document in your possession and be advised of the following information: 1. General Clarifications To Questions From Bidders

Q1. On drawing R-0 under REFRIGERATION SYSTEM CHARGES it states the compressor jacket

cooling is 50% Ethylene Glycol but on drawing R-5 EQUIPMENT SCHEDULE it states the primary compressor cooling is water. Please confirm if the compressor jacket cooling fluid is 50% Ethylene Glycol or water.

A1. Compressor jacket cooling shall be 50% ethylene glycol and shall be driven by P3 as per

drawings R-2 and R-5. Q2. On drawing R-5 under EQUIPMENT SCHEDULE it states HX-2 (HEAD COOLING) shall be

22% brine and glycol but P-4 on the same drawing indicates it should be water. Please clarify if this should be glycol or water.

A2. The heat exchanger transfers heat from the glycol circuit to the water circuit. P-4 is driving

the water circuit. NOTE: the schematic incorrectly identifies the loop as Brine and will be corrected in the ISSUED FOR CONSTRUCTION drawing set.

Continued on next page…

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Q3. In the refrigeration specifications item 2.27 COMPRESSOR OIL AND JACKET COOLING

item 1 states “Deep lake water used for condensing shall also be used as the cooling medium for compressor oil and jacket cooling glycol” but drawing R-4 suggest the compressor is to be cooled from the brine supply & return mains and NOT deep lake water. Please clarify how the compressor jacket shall be cooled.

A3. As shown on drawing R-2 a glycol circuit shall be run through the compressor heads for

cooling purposes and then to HX-2. The heat shall be passed from the glycol circuit to the Deep lake water circuit in this device. NOTE: the schematic incorrectly identifies the loop as Brine and will be corrected in the ISSUED FOR CONSTRUCTION drawing set.

Q4. On drawing R-2 it shows HX-2 as glycol to brine but also states “chilled water from City

Hall” but drawing R-4 shows we are pulling the cooling from the ice rink and not chilled water from City Hall. Please clarify.

A4. There is an error on R-2 as noted in Q2 and Q3 above. The deep lake cooling loop was

labeled BRINE in error. This will be clarified on the ISSUED FOR CONSTRUCTION drawing set.

Q5. Drawing R-4 shows P-3 and P-4 circulating the glycol to cool the compressors but drawing R-2 shows P-3 and P-4 on two different circuits…Please advise if P-3 and P-4 should be on the same circuit and one acting as a standby pump.

A5. The arrangement of P-3 and P-4 should be as per drawing R-2. The layout shown in R-4

can be clarified in the ISSUED FOR CONSTRUCTION drawing set. Q6. If P-3 and P-4 is on the same circuit how is the brine circulated from the brine mains

supply & return line to the heat exchanger (see drawing R-4.)? A6. P-3 and P-4 are not on the same circuit (see response to Q5). Q7. On drawing R-0 under PIPE INSULATION it states “ALL PIPES MUST BE INSULATED

(EXCEPT FOR A.SD AND CJG.R) AND FINISHED WITH JACKET COVERING but drawing R-2 only shows the brine supply & return piping to have 2” fibreglass & canvas jacketing. Please confirm if only the brine supply & return piping is to be insulated.

A7. All pipes must be insulated and finished with jacket covering (except for A.SD and CJG.R).


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Q8. On drawing R-4 both P3 and P4 appears to be an inline pump but on drawing R-6 3

MOTOR MOUNT PUMP shows it base mounted. Please advise if P3 and P4 shall be base mounted or inline.

A8. P-3 and P-4 shall be motor mounted as per drawing R-6.

Q9. On drawing R-5 under EQUIPMENT SCHEDULE it states one (1) N4M 100HP compressor at 1112 RPM, 95F SCT, 10F SST will yield a total capacity of 95.3 TR. Based on the manufactures software these design conditions will produce a much lower capacity then suggested. Please advise.

A9. The capacities noted on drawing R-5 were provided by the manufacturer. Q10. On drawing R-7 it indicates the cold brine supply & return headers shall be stainless steel

and the mains connection that shall be field connected is 8” PVC. Please confirm the mains from the headers to the chiller shall be PVC as per R-7 drawing back to the brine pumps.

A10. Correct (as per drawing R-7).

Q11. Please advise if the refrigeration contractor shall provide the MCC for the refrigeration equipment on 6R shown on drawing E10.

A11. MCC-6R shall be supplied and installed by Electrical Contractor. Q12. Drawing E10 and R-5 contradicts the disconnect switch size. E10 indicates 600 amps

while R-5 shows 200 amp for CP1 and 200 amp for CP2. Please clarify. A12. Disconnect size for Compressor C1 and C2 shall be 400Amps. This is to match 400A/250AT

Overcurrent protection in MCC-6R. Q13. Please advise if CP1 shown on drawing R-5 is the same as 6R shown on drawing E10. A13. CP1 and CP2 are the starters for Compressor C1 & C2.


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Q14. Drawing R-4 shows a motor control centre and a refrigeration control panel but E7 only

shows the motor control centre with no room allowances for the refrigeration DDC control panel. Please advise if the refrigeration DDC control panel shall be mounted within the refrigeration MCC.

A14. DDC Control Panel shall not be mounted within MCC-6R. Q15. Drawing E10 does not show the refrigeration DDC control panel switch. Please advise. A15. Electrical Contractor shall provide dedicated 15A, 120Volt Power connection (Cct. #RCSB-

41) for DDC Control Panel. Q16. Drawing R-2 shows T-1 being mounted in the ice resurfacer room but drawing R-3 shows

T-5 being mounted in the ice resurfacer room also. Please advise which tank is to be mounted in the ice resurfacer room.

A16. T-1 is to be mounted in the ice resurfacer room. T-5 to be installed in the refrigeration

room. Q17. None of the refrigeration drawings show where T-6 is to be located and installed. Please

advise. A17. T-6 to be installed in the refrigeration room (in line with T-5). Q18. On drawing R-5 it states the contractor is to provide a chiller expansion tank (T-4) which

indicates a surge drum on drawing R-2. Please advise what type of expansion and size we are to provide for the Alfa Laval plate heat exchanger.

A18. T-4 is depicted as a separate device in the R-2 schematic for clarity’s sake. In the

equipment schedule (R-5) it was selected as an add-on option to the HX-1 selection. Q19. The chiller “expansion tank” from Alfa Laval does not come with sight glasses but

drawing R-2 shows five (5) reflex sight glasses. Please clarify. A19. Sight glasses are required and we were advised that they could be included.


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Q20. The specifications state the surge drum shall be vertical but the drawings indicate it’s an

add on feature from Alfa Laval. Please clarify. A20. A vertical surge drum shall be used if the Contractor prefers to submit an alternate HX-1

and stand-alone surge drum (T-4). Q21. Drawing R-2 shows a bucket expansion valve but the specifications and drawings does

not show the model or size required. Please advise what model and size of bucket expansion valve shall be used especially with the chiller add on “expansion tank”.

A21. Armstrong mechanical purgers (XR-1500) are suitable for this project. Q22. Please advise if the use of an Ammonia pump out trailer to evacuate the vapour is a

requirement for this project. A22. Removal and safe storage of the ammonia is the Contractor’s responsibility. A pump out

trailer is suitable for this purpose. Q23. Is the refrigeration contractor is to provide a NEW Ammonia leak detector. The

demolition drawings does not show the removal of the Ammonia leak detector. Please advise if we are to reuse or provide a new Ammonia leak detector.

A23. New ammonia leak detection is required (see scope of work R-0 and specification). Q24. Drawing R-3 shows a 2” brine return and supply line going to the ice resurfacer room

which is tied to the expansion tank but the routing shows the mains going underneath two buildings and contradicts drawing A015. Please clarify.

A24. The lines do not pass underneath buildings but off to the side under the pavers.

Q25. Drawing R-2 only shows a 1” pressure relief header. This does not appear to be adequate for proper venting. Please clarify.

A25. For quoting purposes please use 2” pressure relief headers. The venting design will be

verified during bidder selection and finalized at award.


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Q26. Drawing R-2 does not show a relief valve on the compressor oil separator. Please advise

if they should be carried for each compressor. A26. Relief valves are required for each compressor oil separator. Q27. Based on drawing R-2 its showing the Ammonia low pressure liquid going to the

compressors. Please clarify. A27. We cannot find the issue raised. A.LPL should not be run to the compressors. Q28. Section 23 23 02 ICE RINK SYSTEMS, GENERAL REQUIREMENTS ITEM2.10 EXPANSION

AND MIXING TANKS 1.2. states the brine mixing shall be 50 us gallon but drawing R-5 shows 80 us gallon capacity. Please clarify the correct capacity.

A28. 80 gallon capacity is required. Q29. Section 23 23 02 ICE RINK SYSTEMS, GENERAL REQUIREMENTS 2.28 INSULATION ITEM 3.

.3/4/5 states pre-formed urethane, Armaflex,, polyisocyanurate, foam glass and fibre glass for insulation. Please advise if the contractor can use any one of these types of insulation listed for both brine and ammonia lines.

A29. All insulation types are allowable. Please consult specification for further details /

restrictions. Q30. Drawing R-2 indicates the surge drum, interior and exterior shall be fibre glass & canvas

jacketing. Please advise if canvas jacketing is desired in lieu of the traditional white PVC jacketing.

A30. There are no insulating preferences. Q31. The electrical drawings does not show how the oil pot heater will get its power. Please

clarify. A31. Provide power connection to Oil Pot Heater. Refer to Electrical ‘Changes to Drawing’ in

section 2 below.


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Q32. On drawing R-2 the brine return before the pumps is showing a relief valve before it

splits. Please clarify. A32. Relief valve to be included in bid price. Q33. Drawing R-7 2 TYPICAL HEADER SECTION DETAIL shows the header shall be 8” schedule

40 steel pipe but drawing R-7 1 and 3 shows 8” stainless steel. Please clarify. A33. Drawing R-7, detail 2 should read stainless steel. Q34. If it’s to be stainless steel please advise the type of schedule that shall be used. A34. Stainless Steel 304L Q35. All drawings in R-7 is showing the nipples to be schedule 80 steel piping. Are we to weld

carbon steel nipples to stainless steel header? A35. Drawing R-7, detail 3 explains the installation. Q36. Please advise the PVC schedule we are to use on the cold brine supply & return mains. A36. Schedule 80 PVC (as per notes of drawing R-3).

Q37. On drawing R-0 under REFRIGERATION SYSTEM PIPING AND FITTINGS it states “AMMONIA PIPING SHALL BE SCHEDULE 80 PVC AND STAINLESS STEEL (304L)”. Please clarify.

A37. No stainless steel piping shall be used with Ammonia. Q38. Under section 01 11 00 SUMMARY OF WORK 1.5 WORK BY WORKS .3 WORK OF

PROJECT EXECUTED DURING WORK OF THIS CONTRACT, AND WHICH IS SPECIFICALLY EXCLUDED FROM THIS CONTRACT: 1. states “Replacement of brine header at rink (done 2 years ago) but drawing R-3 and R-7 indicates the headers are to be replaced. Please advise the cold brine supply & return headers are to be reused or replaced.

A38. Headers are to be replaced as per drawing R-3.


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Q39. On drawing R-2 under NOTES 5. States “HX-1 to have flooded evaporator installed as per

manufactures (Alfa Laval MR15-13W)” but on drawing R-5 EQUIPMENT SCHEDULE it states the HX-1 chiller model is Alfa Laval MK15-BWFD. Please advise which plate heat exchanger model shall be provided.

A39. MK15-BWFD is the model number for HX-1. Q40. On drawing R-4 the domestic cold water supply and return line feeding HX-2 has an

arrow showing Ammonia relief. Please clarify. A40. The issued raised cannot be found. There is no ammonia relief at HX-2.

Q41. During the site visit the refrigeration control panel had the following starters that is no

related to refrigeration;

a) Circulation pump b) Pool Filter c) Starter not labelled (assuming this the condensate pump?)

Please advise if this these items are to remain as they are not shown in the electrical drawings or demolition drawings.

A41. None of these are required. Q42. Drawing R-4 shows the new motor centre to be 60” x 30” x 12” but the new MCC will

likely be larger than 90” wide, 80” tall and 25” deep. Please confirm if this area will accommodate an Motor Control Centre.

A42. There is some room in the layout for a larger MCC. Any alternatives to the design must be

reviewed and approved in writing by the Consultant(s) as per City of Toronto Purchasing policy.

Q43. Please advise if the refrigeration starters shall be a starter panel or a motor control

centre. A43. Starters are in MCC supplied and installed by Electrical Contractor.


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Q44. It appears that Drawing E11 Mech Equipment Wiring Schedule and Spec Ice Rink

Systems, General Requirements clause 2.18.2 allows fuses as overcurrent protection but drawing E10 Power Distribution shows breakers. Please advise if either fuses or breakers can be used as overcurrent protection.

A44. Use breakers as per E10. Q45. On Drawing R-5 Equipment Schedule it shows CP-1 and CP-2 with the same information.

Is this a backup control panel? A45. CP-1 serves compressor 1. CP-2 serves compressor 2. Q46. Drawing R-2 Notes item 12 states BAS point can be found on drawing R-6. There is no

points listed on drawing R-6. Please advise. A46. Points list can be found on drawing R-5. The error will be corrected in the ISSUED FOR

CONSTRUCTION drawing set. Q47. The refrigeration specifications state “A dedicated communications line shall be provided

by the contractor to the DDC panel to enable remote communications and system monitoring.” The drawings do not identify where the Ethernet source is coming from. Please advise where our electrician can connect and run an Ethernet to the DDC controller.

A47. Omit this paragraph. It is no longer a design requirement. Q48. The refrigeration specifications state “the DDC controls system shall have one general

alarm output for connection to BMS system”. Who is connecting the BMS system to the refrigeration DDC controller?

A48. The general alarm output from the new refrigeration DDC controller shall be connected to

the existing BAS by the Controls Contractor as part of the BAS work scope. Q49. What type of BMS system would the DDC controller be connect too and are they

compatible? A49. The existing BAS is described in section 23 09 33 of the specifications. Manufacturer to

ensure compatibility between refrigeration DDC controller and BAS.


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Q50. Will additional “Delta keys” be required when connected to the City’s BMS system. A50. Refer to Specification Section 23 09 33. It is not understood what is meant by ‘delta keys.’ Q51. Is the owner responsible to configure the BMS when connected to the refrigeration DDC

controller? A51. All work relating to connections to the existing BAS is the responsibility of the Controls

Contractor as part of the BAS work scope.

2. Changes to Drawings a. Architectural

1. Add Sheet A301 Revision 01 dated June 6, 2016 (1 page enclosed). 2. Sheet A310, A311, A312, A316 (drawing re-issued as Revision No. 01

dated July 25, 2016): Revise drawing as shown in clouded areas. (4 pages enclosed).

b. Mechanical 1. Sheet M3 and Sheet M5 (drawing reissued as revision no. 5 dated July 20,

2016): Revise drawing as shown in clouded areas. (2 pages enclosed). c. Electrical

1. Sheet E1 – ELECTRICAL LEGEND, NOTES AND DETAILS: (NOT RE-ISSUED) a. In Panel ‘6F’, revise breaker from 40A-3Pole to 60A-3Pole for

45Kva Transformer serving Panel 2F. b. Add 100A-3P breaker in Panel ‘2F’ to serve Fountain Equipment

Control Panel. c. Add two (2) 20Amps, 30mA GFI Trip, 2 Pole breaker in Panel

RCSB. 2. Sheet E3 – MECHANICAL ROOM LEVEL 2 – ELECTRICAL DEMOLITION

LAYOUT: (NOT RE-ISSUED) a. Include in tender price for removal/relocation of receptacles,

power connections as shown (Designated with ‘R’ and/or shown dashed) on the layout and/or required for proposed construction work.

3. Sheet E7 – MECHANICAL ROOM LEVEL 2 – NEW POWER & SYSTEMS LAYOUT: (NOT RE-ISSUED)

a. In Mechanical Chiller Room, Include in tender price for disconnection and reconnection of sump pumps (duplex) in pit to be replaced. Include for removal of conduit, power & alarm wiring to control panel and providing new to match existing for fully operational system.

b. In Mechanical Chiller Room: 1. Add power connection (20A, 120V, Cct. #RCSB-43) for Oil

Pot Heater. Continued on next page…

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2. Add power connection (15A, 120V, Cct. #RCSB-41) for DDC Panel.

c. Revise Note 5 to read as following: 1. Provide heat trace cable (Pentair/Raychem #XL-Trace-

208Volt, 1 Phase) system c/w all required accessories for ambient temperature of -20 F (-28.9 C). Wattage, type of cable and installation to suit manufacturer recommendations for three (3) runs of 3" dia. Sched 80 CPVC pipe and one (1) 6" dia. Schedule 80 CPVC pipe. Length of each pipe size is 150feet for total of 600feet. Refer to Fountain System Drawings (F-15) for piping details. Coordinate scope of work Fountain System Contractor. Exact location and number of connections shall be verified on site. Allow for two (2) 20A (30mA Trip Breaker), 208V, 1 Phase power connections for heat trace cables.

4. Sheet E10 – POWER DISTRIBUTION DIAGRAM: (NOT RE-ISSUED) a. Add 800Amps, 416Volt rated Non-Automatic disconnect switch

(Breaker Type and Compact Style-Min. IC Rating of 42KA) ahead of the 800Amps splitter and in line with incoming power feeder.

b. Revise 800A/800AF fusible disconnect switch ahead of 450Kva transformer to 800A/800A LSI Trip Unit disconnect switch (Breaker Type and Compact Style- Min. IC Rating of 42KA).

c. Add Note 10 as follows: Work related to addition of 800Amps 416Volt disconnect switch and replacement of splitter shall be done in minimum possible time period (Continuous, during daytime and not to exceed 12 hours) to ensure all existing to loads are made operational upon replacement work completion. Provide all required materials, equipment and labor to achieve scope of work.

d. Revise 30Kva to 45Kva Transformer ahead of Panel ‘RCSB’. Revise disconnect switch to 100A/80AF, primary feeder of 3#3AWG RW90+G in 1-1/4”C and secondary feeder of 4#2/0AWG RW90+G in 2”C.

d. Fountain

1. Sheet F-12: Replace item no. 5 with the following: a. IN LINE FILTER UNIT OF PHOSPHATE PRE-TREATED STEEL 37-2

WITH POLYESTER COATING, SMC LID, AND NBR SEALS. RATED FOR FLOW OF 1320 GPM. UNIT COMPLETE WITH LARGE AREA REMOVABLE STAINLESS STEEL 316 DEBRIS SCREEN 30 MESH, QUICK RELEASE COVER, DUAL DRAIN PLUGS AND FLANGES. (8" FLANGED). AMAID IN-LINE SERIES. QTY. - 2


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All other information regarding the call document is unchanged. All other terms and conditions remain the same. Should you have any questions regarding this addendum contact Michael Porcarelli, Corporate Buyer, at email [email protected]. Please attach this addendum to your Request for Tender document and be governed accordingly. Bidders must acknowledge receipt of all addenda on the space provided on the Tender Call Cover Page as per the Process Terms and Conditions, Section 1, Item 8 - Addenda, of the Tender Call document. All other aspects of the Tender remain the same.

Yours truly, Joanne Kehoe, Manager, Construction Services, Purchasing & Materials Management

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Documents

Michael Pacholok, Purchasing and Materials Management … · 2020-06-12 · Q3. In the refrigeration specifications item 2.27 COMPRESSOR OIL AND JACKET COOLING item 1 states “Deep