douglas spratt & associates ltd. - new westminsterdouglas spratt & associates ltd. suite...

Douglas Spratt & Associates Ltd.

Suite 100, 321 West 24th Street Telephone: (604) 990-0083 North Vancouver, B.C. V7M 2C7 Fax: (604) 990-4051 [email protected]

T:\Projects\377 NWest Boilers\Tender\Addendum 1\Addendum M1 2011_05_30.docx:SK

Addendum # M1

Project: New Westminster Boilers Issued By: Douglas Spratt

Date: May 30, 2011 Our File No.: 377

Distribution: Name Company Fax or e-mail (as sent)

Heather Rossi

City of New Westminster

[email protected]

Wayne Werbovetski City of New Westminster

[email protected]

This addendum shall be read in conjunction with and considered as an integral part of the Contract Documents. These revisions supersede the information contained in the original drawings, specifications or previously issued addendum. The Tender Price submitted shall include all items of the addendum.


Project Name New Westminster

Boilers Page: 2 of 9

Addendum No. M1


Specifications:

Item Section Revision

1 01555 Modify article 1.7.1 to read: “Smoking is not permitted within the building or within 3 meters of any entry/exit or operable window.”

2 09900 Under 1.1, add new item 1.1.4: “Paint new exposed ductwork outside of the boiler room.”

3 09900 Under 2.2, add new item 2.2.1: “Ductwork: Metal primer and metal finish.”

4 15050 Under 1.1, add new item 1.1.6: “Provide the services of a structural engineer, registered in B.C., to design and review the chimney/vent supports, including tether wiring attachments. Provide letters of assurance.”

5 15015 Add article 2.1.6: “.4 Include a compact disk pocket at the front inside cover of the manuals, and provide a CD with digital photographs and record drawings.”

6 15200 Add article 1.1.4: “In the Police Services building, insulate all existing and new piping from the boilers to the supply air coil and from the boilers to the heat pump loop. The heat pump loop shall not be insulated.” Clarification: the hot water heating piping in the Police Services building is presently uninsulated. The intent is to insulate all hot water heating piping in the boiler room.

7 15210 Add new section, Duct Insulation, attached. Clarification: This applies to the new combustion air duct at City Hall.

8 15600 Modify subsection title 2.1 to read: “Forced Draft Cast Iron Boiler (City Hall)”

9 15600 Add article 2.1.3.7 Low Temperature package - 100% low temperature protection package complete with circulation pump, control valve and controls.

10 15600 Add subsection 2.1.3.8 Accessories .1 Seismic kit, with design certified by a professional engineer registered in the province of BC.

11 15600 Modify subsection title 2.2 to read:“Condensing Boiler (Police Building)”

12 15830 Add new section, Ductwork, attached.

13 15600 Delete article 2.2.4.4.

14 15940 Add article 3.2: “Provide upgraded graphics including a more accurate representation of on-site hydronics.”

15 15940 Add article 4.1.6: “The boilers shall be interlocked with the combustion air fan (through an air-proving switch) and shall only run if the fan is operating.”




Addendum No. M1


16 15940 Delete article 4.2.2

17 15980 Add attached Points list to Section 4.

18 15990 Replace the permissible CV range on the control valve schedule with the following:

Tag CV-1 CV-2 CV-1

Building City Hall City Hall Police Services

Permissible Cv range 32-45 93-105 78-88

19 15990 Delete the accessories listing on the boiler schedule and replace with the following:

Tag B-1 B-2

Building City Hall Police Services

Accessories Lon-Bacnet interface

100% Low Temperature Protection Package

Seismic Brackets

Lon-Bacnet interface

Seismic Brackets




Addendum No. M1


20 15990 Delete and replace the following items associated with the fan schedule:

Tag F-1

Volume (cfm) 1100

E.S.P. Press (in.wg.) 0.75”

RPM 1725

Power Draw (bhp) 0.18

Motor Power (HP) 1/3

Power Supply (V/Ph/Hz) 115/1/60

Drive Belt

Type Centrifugal Inline

Manufacturer Greenheck

Model BSQ-160HP

Control Interlocked with boilers

Sones 6.8

Motor High Efficiency, brushless DC

Accessories Flat panel inlet filter & rack. Internal insulation lining




Addendum No. M1


Drawings:

Item Drawing Revision

21 M200 Add Note 9, directed at combustion air relief louver, and add Note: “Install new SS 45 degree diversion hood. Direct flow away from combustion air.”

See attached MSK-3.

22 M200 Delete flow rate on combustion air supply.

23 M200 Add note to replace existing ductwork and add fire dampers in the boiler room per attached sketch MSK-3.

24 M211 On new plan:

1. Delete “others” stated in Note 1 text and replace with “abatement contractor”.

2. Add unit ID tag P-14 (below) to the supply riser on the new boiler B-1.

3. Add pipe size to domestic hot water tanks supply and return “65 dia”.

4. Add domestic hot water pumps P12, P-13 line size = “50 dia” See attached MSK-4.

25 M212 On Demolition plan:

1. Modify Demo Note 1 by deleting “Contract” and substituting “work”.

26 M212 On new plan:

1. Add to New Note 4: “Provide flexible connection.” 2. Add unit ID tag F-1 to the combustion air fan noted by note 4.

See attached MSK-5.




Addendum No. M1


27 M220 On new schematic:

1. Add pipe size to domestic hot water tanks supply and return “65 Dia”.

2. Domestic hot water pumps P12, P-13 line size = “50 dia” 3. Delete and replace isolation valve on B-1 relief vent with

union. 4. Add DDC temperature sensor to XB-2 return water line. 5. Add pipe size to XB-2 new pipes to the header “75 dia”.

See attached MSK-6.

28 M221 On Demo Schematic, retain existing 50 mm abandoned gas line.

29 M222 On new schematic:

1. Add DDC tank temperature sensors to TDHW-1 & TDHW-2. 2. Add DDC temperature sensor to common supply water

temperature. 3. Add pipe size to Main DCW supply pipe “65 dia”.

See attached MSK-7.

30 M312 Modify new notes 2 to read: “New 125 diameter Cat I double wall B Vent for existing wall mount DHW Heaters.”

31 M312 Direct new note 1 to the new condensing boiler B-2 vent.

32 M312 Renumber arrow pointing to new DHW heater vent roof penetration to Note 4.

33 M312 Add new note 4: “Run vents through existing opening. Provide new SS Counter flashing. Terminate as per detail 4/M312.”

See attached MSK-8.

34 M312 Delete single exhaust termination detail and replace with attached MSK-1 detail.

35 M312 Add new detail 4: “Multiple exhaust termination detail” per attached MSK-2 detail. Note: new roofing work to RCABC standards. Lap existing base roofing membrane 900 mm. Lap existing cap sheet membrane by 300 mm.




Addendum No. M1


36 M320 On New Schematic:

1. Add note 3; direct towards box adjoining B-2, “Note 3: Install new acid neutralizer.”

2. Delete valve and replace isolation valve on B-1 relief vent with a union.

3. Modify new piping arrangement adjacent to XCV as follows: a. Reverse arrows on the supply and return immediately

off of the heat pump loop b. Delete the new pipe and isolation valve branching

between the supply and return line. c. Show new caps on downward port of XCV and the

respective supply line. d. Retain supply line piping.

See attached MSK-9.




Addendum No. M1


Attachments:

Item Revision

1 Pump Schedule, 3 pages, Dated May 2011, Updated Pump Schedule 2011_05_27.pdf

2 Points schedule, 2 pages, Dated May 2011, Points Schedule 2011_05_27.pdf

3 Single Exhaust Termination Detail, 1 page, Dated May 27, 2011, MSK-1 Single Exhaust Termination Detail 2011_05_27.pdf

4 Multiple Exhaust Termination Detail, 1 page, Dated May 27, 2011, MSK-2 Multiple Exhaust Termination Detail 2011_05_27.pdf

5 MSK-3 M200 Revisions 2011_05_30, 1 Page, Dated May 30, 2011, MSK-3 Revisions 2011_05_30.pdf







12 15210 Duct Insulation (3 pages)

13 15830 Ductwork (4 pages)

14 15935 Duct Accessories (2 pages)




Addendum No. M1


End of Addendum

City of New Westminster Section 15990 Boiler Upgrades Page 1 City Hall & Police Services EQUIPMENT SCHEDULES May 2011

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C:\Dropbox\DSA\Projects\NWest\Tender\Addendum 1\Updated Pump Schedule 2011_05_27.doc

Pumps

Tag P-1 P-2 P-3 P-5

Building City Hall City Hall City Hall City Hall

Function North Perimeter Radiation

South Perimeter Radiation

AHU-1 East Perimeter Radiation

Location Boiler Room Boiler Room Boiler Room Boiler Room

Type In Line Circulator

In Line Circulator

In Line Circulator

In Line Circulator

Impeller Stainless steel Stainless steel Stainless steel Stainless steel

Casing Cast iron Cast iron Cast iron Cast iron

Medium Pumped Hot Water Hot Water Hot Water Hot Water

Maximum Operating Temp. (ºC) 93 93 93 93

Design Flow Rate (l/s) / gpm 4.73/ 75 7.89 /125 1.26 /20 2.84/45

Discharge Head (kPa)/ feet 105 /35 105 /35 75 /25 105/35

Speed (RPM) 3-Speed 3-Speed 3-Speed 3-Speed

Power Supply (V/ph/Hz) 208/3/60 208/3/60 115/1/60 208/3/60

Manufacturer Grundfos Grundfos Grundfos Grundfos

Model UPS 40-240/2 UPS 80-160/2 UPS 26-150 FC

UPS 40-240/2

Options

Options:

1. Integral VFD, 0-10 VDC input controlled by boiler, c/w Geni Module

2. By Boiler Manufacturer

3. All Stainless Steel


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Pumps con’d

Tag P-9 P-12 P-13 P-14

Building City Hall City Hall City Hall City Hall

Function Police Reheat Coils

DHW Heating DHW Heating B-1 Circulation

Pump

Location Boiler Room Boiler Room Boiler Room Boiler Room


In Line Circulator

In Line Circulator

In Line Circulator

Impeller Stainless steel Stainless steel Stainless steel Stainless steel

Casing Cast iron Cast iron Cast iron Cast iron

Medium Pumped Hot Water Hot Water Hot Water Hot Water

Maximum Operating Temp. (ºC) 93 93 93 93

Design Flow Rate (l/s)/ gpm 1.26 /20 1.8 /29 1.8 /29 9.6 /152.16

Discharge Head (kPa) / feet 75 /20 80 /27 80 /27 30 /10

Speed (RPM) 3-Speed VFD VFD 3-Speed

Power Supply (V/ph/Hz) 115/1/60 208/1/60 208/1/60 208/3/60

Manufacturer Grundfos Grundfos Grundfos Grundfos

Model UPS 26-150 FC

MAGNA

40-120SF

MAGNA

40-120SF

UPS 100-40/4

Options 1, 3 1, 3 2

Options:





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Pumps con’d

Tag P-15 P-9 P-10

Building City Hall Police Services Police Services

Function XB-2 Circulation

Pump

Heating Coil Heat Pump Loop

Location Boiler Room West Side of Mech Room

West Side of Mech Room


In Line Circulator

Vertical Inline

Impeller Stainless steel Stainless steel Stainless steel

Casing Cast iron Cast iron Cast iron

Medium Pumped Hot Water Hot Water Hot Water

Maximum Operating Temp. (ºC) 93 93 93

Design Flow Rate (l/s)/gpm 8.5/135 2.52/40 12.6/200

Discharge Head (kPa)/feet 30/10 60/20 60 /20

Speed (RPM) 3-Speed VFD VFD

Power Supply (V/ph/Hz) 208/3/60 208/1/60 208/1/60

Manufacturer Grundfos Grundfos Grundfos

Model UPS 80-80/4 MAGNA

40-120

TPE80-160/2 Series 1000

Options 1 1

Options:




City of New Westminster Section 15980 Boiler Upgrades Page 1 City Hall & Police Services POINT SCHEDULES May 2011

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C:\Dropbox\DSA\Projects\NWest\Tender\Addendum 1\Points Schedule 2011_05_27.doc

POINT SCHEDULE

4.1 City Hall

Point Description Hardware Point Type

Trend Alarm Show on Graphic

Comments

New Points Combustion Fan Status AI Y Y Air Pressure switch DI Y Y B-1 Return water temperature AI Y Y B-1 Supply water temperature AI Y Y XB-2 Supply water temperature AI Y Y XB-2 Return water temperature AI Y Y P-12 Status AI Y Y P-12 Enable DO P-13 Status AI Y Y P-13 Enable DO P-14 Status AI Y Y P-14 Enable DO P-15 Status AI Y Y P-15 Enable DO CV-1 AO Y CV-2 AO Y TDHW-1 Tank Temperature AI Y Y Y TDHW-2 Tank Temperature AI Y Y Y DHW Supply water temperature AI Y Y Y Existing Points For Reference OnlyCH_BLR_S_RAD_V AO Update as required CH_BLR_N_RAD_V AO Update as required CH_1STFLOOR_EAST_RAD_P11_C DO Update as required CH_EASTSIDE_RAD_C DO Update as required CH_HALL_COMP_R DO Update as required CH_BLR_HWP10_C DO Update as required CH_BLR1_C DO Update as required CH_BLR2_C DO Update as required CH_BLR_N_HWP1_C DO Update as required CH_BLR_S_HWP2_C DO Update as required CH_BLR_HWP9_C DO Update as required CH_BLR_CA_SF DO Update as required CH_PMP3_C DO Update as required CH_2NDFLOOR_EAST_RAD_P11_S AI Update as required CH_BLR1_SWT AI Update as required CH_BLR2_SWT AI Update as required CH_BLR_N_RAD_SWT AI Update as required CH_BLR_S_RAD_SWT AI Update as required

City of New Westminster Section 15980 Boiler Upgrades Page 2 City Hall & Police Services POINT SCHEDULES May 2011

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C:\Dropbox\DSA\Projects\NWest\Tender\Addendum 1\Points Schedule 2011_05_27.doc

4.2 Police Services

Point Description Hardware Point Type

Trend Alarm Show on Graphic

Comments

New Points P-9 Status AI Y Y P-9 Enable DO Y P-9 Set Point AO P-9 Feedback AI Y P-10 Status AI Y Y P-10 Enable DO Y P-10 Set Point AO P-10 Feedback AI Y CV-1 AO Y B-2 Supply Water temperature AI Y Y B-2 High Temp Return Water AI Y Y Existing Points For Reference Only BLR_P3S AI Update as required BLR_P8S AI Update as required BLR_HWST AI Update as required BLR_HWRT AI Update as required BLR_OAT AI Update as required FC_RWT AI Update as required LOW_WATER_AL DI Update as required FC_SWT AI Update as required MAU1_PS AI Update as required MAU1_SAT AI Update as required BLR_PSC DO Update as required BLR_P8C DO Update as required BLR_VLV AO Update as required BLR_B3_LO DO Update as required BLR_B3_HI DO Update as required BLR_B3_LO DO Update as required BLR_B4_HI DO Update as required FC_P1C DO Update as required FC_P2C DO Update as required MAU1_PC DO Update as required MAU1_HCV AO Update as required

Note:

For new boilers, also provide BACnet interface with boiler control panel and migrate over available information. Allow for a minimum of 20 virtual points, shown on graphics.

City of New Westminster Section 15210 Boiler Upgrades Page 1 City Hall & Police Services DUCT INSULATION May 2011

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T:\Projects\377 NWest Boilers\Tender\Addendum 1\15210 Duct Insulation.doc

1. GENERAL

1.1 Scope

.1 Duct acoustic/thermal insulation.

.2 Adhesives, tie wires, tapes.

1.2 Quality Assurance

.1 Insulation shall be installed by skilled workmen regularly engaged in this type of work.

.2 Materials shall meet fire and smoke hazard ratings as stated in this section and defined in applicable current building codes.

1.3 Submittals

.1 Submit shop drawings which indicate complete material data, "K" value temperature rating, density, finish, recovery jacket of materials proposed for this project and indicate thickness of material for individual services.

.2 Submit samples of proposed insulating materials and recovering.

1.4 Job Conditions

.1 Deliver material to job site in original non-broken factory packaging, labelled with manufacturer's density and thickness.

.2 Perform work at ambient and equipment temperatures as recommended by the adhesive manufacturer. Make good separation of joints or cracking of insulation due to thermal movement, poor workmanship or material defects.

1.5 Alternatives

.1 Alternative insulations are subject to approval. Alternatives shall provide the same or better thermal resistance at normal conditions as material specified.

2. PRODUCTS

2.1 General

.1 Insulation Material, Vapour Barrier Facings, Tapes and Adhesives: Composite fire and smoke hazard ratings shall not exceed 25 from flame spread and 50 for smoke developed.

.2 Insulating materials and accessories shall withstand service temperatures without smouldering, glowing, smoking or flaming.


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.3 All insulation materials shall meet current Building Code Standards, and packages or containers of such materials shall be appropriately labelled.

2.2 Materials

.1 Acoustic Lining: Fibrous glass or mineral fibreboard insulation with "K" value maximum 0.035 W/m.°C0.25 Btu-in/(hr ft2°F) at 24°C75°F. Absolute roughness of exposed surface not to exceed 0.58 mm0.02 in, coated to prevent fibre erosion at air velocities up to 25.4 m/s 5,000 fpm, 24 kg/m³1.5 lb/ft3 minimum density for ductwork and 75 kg/m³4.7 lb/ft3 for plenums. Substrate must not be dark in colour. Service temperature -40°C-40°F to 65°C150°F.

.2 Acoustic Lining Coating: Anti-erosion Robson’s Liner Cost, neoprene polymer with anti-microbial and anti-fungal additives.

3. EXECUTION

3.1 Preparation

.1 Ensure surface is clean and dry prior to installation. Ensure insulation is dry before and during application. Finish with systems at operating conditions where possible.

3.2 Installation

.1 Ensure insulation is continuous through inside walls.

.2 Do not insulate ductwork with external thermal insulation where acoustic duct insulation is specified.

.3 Acoustic Lining: Apply to interior of ducts where shown. Secure to ductwork with adhesive using 50% coverage and anchors or weld pins on 400 mm16 in centres. Secure in place with retaining clips. Cut off excess fastener length and cover with brush coat of mastic over protrusions and all raw edges. Use 25 mm1 in thick insulation unless otherwise noted. Provide vapour barrier located on the warm side for outside air intakes. Bevel corners at joints and butt together. Install acoustic gauze over all cut corners and joints and brush coat with lap seal adhesive.

.4 Where existing acoustic lining has exposed fibreglass, apply anti-erosion coating.


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3.3 Insulation Installation Thickness Schedule

Ducts and Equipment Insulation Thickness

(mm(in) Type

.1 Combustion Air Duct (City Hall) 502 Internal

.2 Relief Air Duct (City Hall) -- --

.3 Outside Air Intake Duct (City Hall) 502 Internal

END OF SECTION

City of New Westminster Section 15830 Boiler Upgrades Page 1 City Hall & Police Services DUCTWORK May 2011

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T:\Projects\377 NWest Boilers\Tender\Addendum 1\15830 Ductwork.doc

1. GENERAL

1.1 Scope

.1 Ductwork and plenums.

.2 Fasteners.

.3 Sealants.

1.2 Definitions

.1 Duct sizes shown on plans are inside clear dimensions. For acoustically lined or internally insulated ducts, maintain sizes inside ducts.


.1 Ductwork shall meet the requirements of NFPA No. 90A - Air Conditioning and Ventilating Systems; NFPA No. 90B - Standard for the Installation of Warm Air Heating and Air Conditioning Systems.

.2 Fabricate in accordance with SMACNA HVAC Duct Construction Standards (third addition – 2005) and ASHRAE handbooks.

.3 Flexible air duct shall conform to NFPA 90A and UL181 standard for factory made air duct materials and air duct connectors.

1.4 Alternatives

.1 Obtain written permission from the Consultant prior to making variations in duct configuration or sizes. Size alternatives using ASHRAE table for circular equivalents of rectangular ducts.

2. PRODUCTS

2.1 Ducts

.1 Ducts, general: Galvanised steel lock forming quality, having galvanised coating of 380 g/m21.25 oz/ft2 for both sides. Provide satin coat ready for painting.

2.2 Sealants

.1 General: Water resistant, fire resistive, compatible with mating materials.


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3. EXECUTION

3.1 Installation

.1 Locate ducts with sufficient space around equipment to allow normal operation and maintenance activities.

.2 Coordinate the location of duct access doors. Refer to Section 15860 - Duct Accessories.

.3 Install ducts associated with fans subject to forced vibration with flexible connections immediately adjacent to equipment. Refer to Section 15860 - Duct Accessories.

.4 Do not use flexible duct.

.5 Prove that ductwork is substantially airtight before covering or concealing.

.6 Fabricate ductwork from field measurements and not from plans and shop drawings exclusively. Failure to do so will not constitute an extra to the Contract.

.7 Complete metal ducts within themselves with no single partition between ducts. Where width of duct exceeds 450 mm18 in crossbrace for rigidity. Open corners are not acceptable.

.8 Lap metal ducts in direction of air flow. Hammer down edges and slips to leave smooth duct interior.

.9 Construct tees, bends and elbows with radius of not less than 1-1/2 times width of cut on centre line. (“Zero” edge radius elbows are not acceptable.) Where not possible or where rectangular elbows are specified, provide double wall air foil type turning vanes.

.10 Increase duct sizes gradually, not exceeding 15° divergence wherever possible. Maximum divergence upstream of equipment to be 30° and 45° convergence downstream.

.11 Rigidly construct metal ducts with joints mechanically tight, substantially airtight, braced and stiffened so as not to breathe, rattle, vibrate or sag. Caulk duct joints and connections with sealant as ducts are being assembled. Seal seams on fresh air and exhaust ducts watertight with mastic or low velocity duct sealant.

.12 Fasteners: Use rivets and bolts throughout; sheet metal screws accepted on low pressure ducts.

.13 Ducts that penetrate walls which separate occupied spaces from service spaces such as Cith Hall boiler room shall have a sheet metal angle frame installed on all sides of the duct, on both sides, when there is no requirement for a fire damper. Apply acoustic sealant/caulking.

3.2 Duct Sealing

.1 All new ductwork shall be sealed according the following sealant class (see Duct Sealing Class Schedule below):


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.1 Class A: All transverse joints, longitudinal seams, and duct wall penetrations

.2 Class B: All transverse joints and longitudinal seams

.3 Class C: Transverse joints only

.2 Where required, seal joints as follows:

.1 Slip Joints: Apply heavy brush-on high pressure duct sealant. Apply second application after the first application has completely dried out. Where metal clearance exceeds 1.5 mm0.06 in use heavy mastic type sealant.

.2 Flanged Joints: Soft elastomer butyl or extruded form of sealant between flanges followed by an application of heavy brush-on high pressure duct sealant.

.3 Other Joints: Heavy mastic type sealant.

.4 Exterior joints: Use outdoor sealant.

.3 Duct tape as sealing methods are not permitted.

.4 Do not use lock seam round ducts except for individual branches to air terminals; if used, the longitudinal seams must be sealed with duct sealant. (Gauge to meet Table 3-5 of the SMACNA standard.)

.5 Surfaces to receive sealant should be free from oil, dust, dirt, moisture, rust and other substances that inhibit or prevent bonding.

.6 Prior to sealing all ductwork, demonstrate sealing of a section of each type of duct and obtain approval from the Engineer.

.7 Do not insulate any section of the ductwork until it has been inspected and approved of duct sealant application.

3.3 Material Schedule

Service Sheet Material

.1 Indoor ducting, unless noted otherwise below Galvanized

.2 Outdoor ducting, unless noted otherwise below Galvanized

3.4 Pressure Class Schedule

Service Pressure Class

.1 Relief air 1” wc (250 Pa)


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.2 Outdoor air intakes 2” wc (500 Pa)

.3 Combustion air 2” wc (500 Pa)

3.5 Sealing Class Schedule

Service Sealant Class

.1 Relief air C

.2 Outdoor air intakes C

.3 Combustion air C

END OF SECTION

City of New Westminster Section 15835 Boiler Upgrades Page 1 City Hall & Police Services DUCT ACCESSORIES May 2011

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T:\Projects\377 NWest Boilers\Tender\Addendum 1\15835 Duct Accessories.doc

1. GENERAL

1.1 Scope

.1 Access doors.

.2 Fire dampers.

.3 Flexible connections.


.1 Fire dampers shall be ULC listed and constructed in accordance with ULC Standard S 112 “Fire Dampers”.

.2 Fusible links on fire dampers shall be constructed to ULC Standard S 505.

.3 Demonstrate re-setting of fire dampers to authorities having jurisdiction and Owner’s representative.

.4 Accessories shall meet the requirements of NFPA 90A, Air Conditioning and Ventilating Systems. Fabricate in accordance with ASHRAE Handbooks and SMACNA Duct Manuals.

2. PRODUCTS

2.1 Duct Access Doors

.1 Fabricate rigid and close-fitting doors of galvanised steel with sealing gaskets and suitable quick fastening locking devices. Duct access panels with screws are not acceptable. Install minimum 25 mm1 in thick insulation with suitable sheet metal cover frame for insulated ductwork.

.2 Fabricated with two butt hinges and two sash locks for sizes up to 450 mm18 in, two hinges and two compression latches with outside and inside handles for sizes up to 600 mm x 1200 mm24 in x 48 in and an additional hinge for larger sizes.

2.2 Fire Dampers

.1 Fabricate of galvanized steel or prime coated black steel weighted to close and lock in closed position when released by fusible ink.

.2 Fire dampers shall be curtain type with damper blades retained out of air stream in a recess so free area of connecting ductwork is not reduced.

.3 Fusible links shall be set for 71° C160° F.

City of New Westminster Section 15835 Boiler Upgrades Page 2 City Hall & Police Services DUCT ACCESSORIES May 2011

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T:\Projects\377 NWest Boilers\Tender\Addendum 1\15835 Duct Accessories.doc

2.3 Flexible Connections

.1 Flexible connections shall be airtight at 500 Pa2 in wg.

.2 Durodyne Metal Fab with 3” (75 mm) metal ends and 3” (75 mm) neoprene fabric.

3. EXECUTION

3.1 Access Doors

.1 Provide access door minimum 450 mm x 350 mm18 in x 14 in or 50 mm2 in smaller than duct dimension for cleaning and inspection at positions indicated by drawings and as follows:

• Both sides of turning vanes in all ducts. • At each fire damper location. • At each side of supply fan • Every 30 meters (to facilitate future duct cleaning, supply, return and exhaust)

3.2 Fire Dampers

.1 Provide fire dampers at locations shown, where ducts and outlets pass through fire rated components, and where required by authorities having jurisdiction. Fire dampers shall be complete with required perimeter mounting angles sleeves, breakaway duct connections, corrosion resistant springs, bearings, bushings and hinges.

.2 At each point where ducts pass through a penetration (e.g., wall), duct shall be sealed with non-combustible material.

3.3 Flexible Connections

.1 Install ducts associated with fans and equipment subject to forced vibration with flexible connections, immediately adjacent to equipment and/or where indicated on drawing.

END OF SECTION