PLANS.pdf

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Attached to
Replace 2 Boilers at Rock Rapids Garage
Solicitation number
645-RFB-2524-2026
Issued by
Linn County, Iowa

About this file

This is a mechanical and electrical construction plans document for the Iowa Department of Transportation's boiler replacement project at the Rock Rapids Maintenance Garage located at 1204 N 2nd Ave E, Rock Rapids, IA 51246. The project involves the replacement of two existing 180 MBH natural gas boilers (US Boiler UALTA 180 models) that support the facility's in-floor radiant heating system. The scope of work includes demolition of existing boilers, pumps, combustion air intake venting, and associated controls; installation of new boilers with integrated primary heating pumps; replacement of all shutoff valves throughout the system; installation of new air and dirt separators, expansion tanks, glycol feeders, and temperature sensors; flushing of all existing heating water piping to remove accumulated sediment; removal and replacement of inadequate pipe insulation; electrical disconnection and reconnection work including new breakers and wiring; and roof penetrations for new venting and combustion air intake lines. The project includes connections to four existing zone manifolds (Garage, Mechanics Bay, Wash Bay, and a new Brine Building), with secondary heating loops sized for 15°F delta T at 95°F supply temperature. The plans were prepared by Shive-Hattery engineering firm in West Des Moines, IA, with certifications from licensed mechanical engineer Brian A. Steffens (License 22014) and electrical engineer Edin Smailovic (License 21953), both dated January 9, 2026.

The construction documents include detailed mechanical floor plans, schematics, and symbol legends specifying equipment schedules for two identical boilers, four secondary zone pumps (Grundfos UPS series), two primary boiler pumps, one expansion tank (Bell and Gossett B-200, 53-gallon bladder type with 36 PSI relief setting), one air and dirt separator (VDN200FA), and one glycol feeder (Axiom DMF300 with 17-gallon tank filled with 30% propylene glycol). All piping is to be insulated per specifications, with new 3-inch venting and combustion air intakes requiring 12-foot minimum offset from precast wall faces on the roof and sloped back toward boilers per manufacturer requirements. The contractor is responsible for field verification of existing conditions prior to bid submission, patching and repairing all unused openings and modified surfaces, and proper disposal of construction debris unless claimed by the owner who retains first salvage rights.

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SPECIFICATIONS.pdf PDF
1372264-event.pdf PDF
Pre-Bid Request for Approval of Products or Materials.pdf PDF

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Text version

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SHEET INDEX CERTIFICATIONS

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IDOT - ROCK RAPIDS BOILER REPLACEMENT

IOWA DEPARTMENT OF TRANSPORTATION

1204 N 2ND AVE E, ROCK RAPIDS, IA 51246

C O

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G000 COVER SHEET

M101 MECHANICAL FLOOR PLAN AND SCHEMATICS

M600 MECHANICAL SYMBOLS, DETAILS, AND SCHEDULES

PROJECT MAP PROJECT LOCATION

PAGES, SHEETS OR DIVISIONS COVERED BY THIS SEAL

MY LICENSE RENEWAL DATE IS DECEMBER 31,

I HEREBY CERTIFY THAT THIS ENGINEERING DOCUMENT WAS

PREPARED BY ME OR UNDER MY DIRECT SUPERVISION AND THAT I

AM A DULY LICENSED PROFESSIONAL ENGINEER UNDER THE LAWS

OF THE STATE OF IOWA.

PRINTED OR TYPED NAME

SIGNATURE DATE

LICENSE NUMBER

Brian A. Steffens

Mechanical items on ME sheets

22014

MECHANICAL ENGINEER

PAGES, SHEETS OR DIVISIONS COVERED BY THIS SEAL

MY LICENSE RENEWAL DATE IS DECEMBER 31,

I HEREBY CERTIFY THAT THIS ENGINEERING DOCUMENT WAS

PREPARED BY ME OR UNDER MY DIRECT SUPERVISION AND THAT I

AM A DULY LICENSED PROFESSIONAL ENGINEER UNDER THE LAWS

OF THE STATE OF IOWA.

PRINTED OR TYPED NAME

SIGNATURE DATE

LICENSE NUMBER

Edin Smailovic

Electrical items on ME sheets

21953

ELECTRICAL ENGINEER

01/09/2026

01/09/2026

T

TTT

M

B-2

B-1

ET-1

F-1

WH-1

REMOVE

EXPANSION TANK

EXISTING WATER

HEATER TO REMAIN

EXISTING FURNACE

TO REMAIN

2" NG

MDP

PANEL A

ED02

MD01

DISCONNECT AND REMOVE

EXISTING BOILER CONTROL

PANEL, REMOVE ASSOCIATED

DISCONNECT, CONDUIT AND

POWER WIRING BACK TO

PANEL A.

EXISTING THERMOSTATS,

PUMP RELAYS, ETC TO

REMAIN. REWIRE AS

REQUIRED TO ACCOMPLISH

SEQUENCE OF OPERATION

WITH NEW EQUIPMENT.

ELECTRICAL

MECHANICAL

MD01

ED02

ED01

MD02

B-1

B-2

PHWP-2

PHWP-1

ET-1

WH-1

F-1

GF-1

2" NG

EMERGENCY

BOILER SHUT

OFF BUTTON

AS-1

1" NG TO

EACH BOILER

EXISTING WATER

HEATER TO REMAIN

EXISTING FURNACE

TO REMAIN

SEE

SCHEM/DETAILS

MDP

PANEL A

E03

E02

E02

E04

E01

M01

E01

ELECTRICAL

MECHANICAL

M01

E04

M101

E3

M101

G3

2" NG

GARAGE

MECHANICS

BAY

MECHANICAL

WASH BAY

3ELECTRICAL

EXISTING MANIFOLD. REMOVE ALL

EXISTING VALVES TO ASSIST WITH PIPE

FLUSHING. REPLACE WITH NEW. NEW

VALVES TO MATCH EXISTING. (TYP. 4)

EXISTING

THERMOSTATS SHALL

REMAIN (TYP.)

EXISTING

GAS METER

C W

EXPANSION TANK

BOILER 1 BOILER 2

1/2"

1-1/4" HWS TO EXISTING

MANIFOLDS B AND C (GARAGE)

2"2"

1-1/4" HWR FROM EXISTING

MANIFOLDS B AND C (GARAGE)

1" HWS TO EXISTING

MANIFOLD D (MECHANICS BAY)

1" HWR FROM EXISTING

MANIFOLD D (MECHANICS BAY)

1" HWS TO EXISTING

MANIFOLD A (WASH BAY)

1" HWR FROM EXISTING

MANIFOLD A (WASH BAY)

1" HWS TO NEW BRINE BUILDING

3/4" HWR FROM BRINE BUILDING

AIR

SEPARATOR

3-WAY

TEMPERING

VALVE (TYP.)

ALL SHUT-OFF

VALVES IN

SYSTEM SHALL

BE REPLACED

(TYP.)

MD02

ED02

ED02

MD01

ED01

1-1/4" HWS TO EXISTING

MANIFOLDS B AND C (GARAGE)

2"

1-1/4" HWR FROM EXISTING

MANIFOLDS B AND C (GARAGE)

1" HWS TO EXISTING

MANIFOLD D (MECHANICS BAY)

1" HWR FROM EXISTING

MANIFOLD D (MECHANICS BAY)

1" HWS TO EXISTING

MANIFOLD A (WASH BAY)

1" HWR FROM EXISTING

MANIFOLD A (WASH BAY)

3/4" HWS TO NEW BRINE BUILDING

3/4" HWR FROM BRINE BUILDING

2"

B-1

M

IN

GAS

SUPPLY

PRESSURE

RELIEF VALVE

AIR

VENT

FULL SIZE TO

FLOOR DRAIN

B-2

NOTES:

1) ALL PIPING CONNECTIONS SHALL

CONFORM TO MANUFACTURER'S WRITTEN

RECOMMENDATIONS

2) CONDENSATE FROM EACH BOILER SHALL

BE RUN TO NEUTRALIZATION TANK

PROVIDED BY BOILER MANUFACTURER.

PIPING TO BOILER B-2 SIMILAR TO B-1

DRAIN VALVE AND CAP

2"

1-1/2"

1-1/2"

STRAINER W/ DRAIN

VALVE (TYP.)PHWP-1

BALANCING VALVE

SHUT-OFF VALVE (TYP.)

THERMOMETER

8" MAX

NEW AIR AND DIRT SEPARATOR

(AS-1). SEE DETAIL

T

NEW TEMPERATURE SENSOR SHALL CONTROL BOILER OUTLET

TEMPERATURES TO MAINTAIN THIS TEMPERATURE (UNDERFLOOR SUPPLY

TEMPERATURE) AT 95ºF (ADJ.).

PRIMARY HEATING LOOP SIZED FOR 30ºF DELTA T (110ºF-80ºF)

SECONDARY (UNDERFLOOR LOOPS)SIZED FOR 15ºF DELTA T (95ºF-80ºF)

EXISTING THERMOSTATS AND UNDERFLOOR RELAY CONTROL PANELS SHALL

REMAIN. THERMOSTATS SHALL TURN ON/OFF CORRESPONDING ZONE PUMPS.

COORDINATE SENSOR AND BOILER CONTROLS WITH EXISTING UNDERFLOOR

CONTROLS TO ACCOMPLISH THIS SETPOINT CONTROL. PROVIDE/MODIFY

WIRING AS REQUIRED.

EXPANSION TANK (ET-1). SEE

DETAIL

GLYCOL FEEDER (GF-1). SEE

DETAIL

ALL EXISTING VALVES IN

SYSTEM TO BE REPLACED

(TYP.)

SHUT-OFF VALVE (TYP.)

STRAINER W/ DRAIN

VALVE (TYP.)

NEW THERMOMETERS ON ALL

SUPPLY AND RETURNS TO/FROM

EACH ZONE (TYP.)

CHECK VALVE (TYP.)

HWP-4

HWP-3

HWP-2

HWP-1

1" NG PIPING FROM MAIN

ABOVE TO EACH BOILER

ONLY A PORTION OF THE BOILER PIPING IS

INSULATED AND MOST DOES NOT MEET

CURRENT CODES. CONTRACTOR SHALL

REMOVE ALL EXISTING INSULATION ON

BOILER PIPING IN THE MECHANICAL ROOM.

ALL EXISTING AND NEW HWS/HWR IN

MECHANICAL ROOM SHALL BE INSULATED

PER SPECS.

E04

E04

E04

E04

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NORTH

01/4" = 1'-0" E3

MECHANICAL DEMO PLAN

6'

NORTH

01/4" = 1'-0" G3

MECHANICAL NEW WORK PLAN

6'

KEYNOTES

KEY NOTE

E01 NEW BOILERS SHALL BE TIED INTO NEW EMERGENCY BOILER SHUTDOWN BUTTON.

E02 PROVIDE WIRING FROM BOILER TO ASSOCIATED BOILER PUMP.

E03 PROVIDE NEW 20A/1P BREAKER IN PANEL A TO DUPLEX GFI RECEPTACLE FOR NEW GLYCOL FEEDER. PROVIDE (2)#12, (1) #12 GND, 3/4" C.

EXISTING PANEL IS A SIEMENS PANEL.

E04 PROVIDE (2)#12, (1) #12 GND, 3/4" C TO NEW PUMP AND BOILER. RECONNECT TO EXISTING CIRCUIT. PROVIDE SINGLE POLE 20 AMP DISCONNECT

SWITCH FOR EACH CIRC PUMP/BOILER.

ED01 REMOVE ELECTRICAL CONNECTIONS FROM PUMP, DISCONNECT, CONDUIT, AND WIRING BACK TO PANEL A.

ED02 REMOVE POWER FOR BOILER/PUMP BACK TO JUNCTION BOX. SAVE CIRCUITS FOR RECONNECTION TO NEW BOILER/PUMP.

M01 3" VENT(S) AND 3" COMBUSTION AIR INTAKE(S) UP THRU ROOF. OFFSET IN CEILING SPACE AS REQUIRED TO INSURE VENTS ARE A MINIMUM DISTANCE OF 12' AWAY FROM PRECAST WALL FACES ON ROOF. INTAKES SHALL BE PVC AND VENTS SHALL BE POLYPROPYLENE AND SHALL BE APPROVED BY THE BOILER MANUFACTURER. VENTING AND INTAKES SHALL SLOPE BACK TOWARD BOILERS ACCORDING TO MANUFACTURER'S.

REQUIREMENTS. TERMINATE PER MANUFACTURER'S WRITTEN RECOMMENDATIONS. SEE DETAIL.

MD01 REMOVE EXISTING BOILERS, PUMPS, COMBUSTION/INTAKE VENTING, AND ALL ASSOCIATED CONTROLS. REMOVE PIPING AS SHOWN ON DEMO

SCHEMATIC.

MD02 REMOVE PUMP AND PREPARE PIPING FOR NEW CONNECTIONS. SEE BOILER PIPING NEW SCHEMATIC.

NORTH

01/16" = 1'-0" E6

OVERALL BUILDING PLAN

24'

NOT TO SCALEA3

BOILER PIPING DEMO SCHEMATIC

NOT TO SCALEA6

BOILER PIPING NEW SCHEMATIC

1. THIS DRAWING DIAGRAMMATICALLY REPRESENTS THE LAYOUT OF EXISTING CONDITIONS WITH MAJOR MECHANICAL AND ELECTRICAL COMPONENTS. ACCESSIBILITY TO DEMOLITION ITEMS SHALL NOT BE INFERRED. THE CONTRACTOR SHALL BE RESPONSIBLE FOR FIELD

VERIFICATION OF BUILDING AND EXISTING CONDITIONS, PRIOR TO BID SUBMISSION.

2. DEMOLTION SHALL INCLUDE ALL HANGERS, FITTINGS, DAMPERS, VALVES, ETC.

3. LIGHT LINES INDICATE EXISTING DUCT, PIPING, EQUIPMENTS, ETC. TO REMAIN. BOLD DASHED LINES INDICATE DEMOLITION WORK ON

THIS PROJECT.

4. CONTRACTOR SHALL PATCH/REPAIR ALL UNUSED OPENINGS AND MODIFIED FINISH SURFACES. PATCH SHALL MATCH MATERIALS, FINISH, AND TEXTURE OF ADJACENT SURFACES.

5. OWNER SHALL RETAIN FIRST SALVAGE RIGHTS TO ALL REMOVED EQUIPMENT AND MATERIALS. UNLESS NOTED OTHERWISE, CONTRACTOR SHALL BE REPONSIBLE FOR PROPER AND TIMELY DISPOSAL OF ALL CONSTRUCTION DEBRIS INCLUDING BUT NOT

LIMITED TO EQUIPMENT AND MATERIALS NOT CLAIMED BY OWNER.

GENERAL DEMOLITION NOTES

1. LIGHT LINES INDICATE EXISTING PIPING, DUCTWORK, EQUIPMENT, ETC. TO REMAIN. BOLD LINES INDICATE PIPING, DUCTWORK, EQUIPMENT, ETC.

TO BE INSTALLED BY THIS CONTRACT UNLESS NOTED OTHERWISE.

2. THE CONTRACTOR SHALL BE RESPONSIBLE FOR FIELD VERIFICATION OF THE BUILDING AND EXISTING CONDIITONS, PRIOR TO BID SUBMISSION.

COORDINATE ROUGH-IN AND FINAL LOCATION OF All EQUIPMENT WITH EXISTING LIGHTING, STRUCTURE, CONDUITS, HOSITS, ETC. PROVIDE OFFSETS AND/OR EASEMENTS, OR RELOCATE EXISTING AS REQUIRED TO AVOID CONFLICTS WITH INSTALLTION OF NEW WORK.

3. CONTRACTOR SHALL PATCH/REPAIR ALL UNUSED OPENINGS AND MODIFIED FINISH SURFACES. PATCH SHALL MATCH MATERIALS, FINISH, AND

TEXTURE OF ADJACENT SURFACES.

4. CONTRACTOR SHALL OPEN GYP CEILING AS REQUIRED TO REMOVE OLD BOILER VENT/FLUE AND TO INSTALL NEW VENT FLUE. PATCH CEILING TO

MATCH EXISTING SURFACE. PAINT TO MATCH.

5. CONTRACTOR SHALL PROVIDE RACKING/UNISTRUT AS REQUIRED TO MOUNT BOILERS IN ROOM.

6. THE EXISTING BOILERS HAVE BEEN FAILING AND IT IS BELIEVED TO BE LEAVING ACCUMULATED SETTLEMENT FROM IN THE HEATING WATER PIPING

SYSTEM. CONTRACTOR SHALL FLUSH/DRAIN ALL EXISTING HEATING WATER PIPING. FLUSH EACH PIPING RUN TO/FROM ALL THE EXISTING MANIFOLDS IN ADDITION TO ALL THE UNDERFLOOR PIPING DOWNSTREAM OF THE MANIFOLD BOXES IN ADDITION TO ALL THE PIPING MAINS. ALL VALVES ARE TO BE REMOVED TO ASSIST IN THE FLUSHING PROCESS. ALL VALVES TO BE REPLACED WITH NEW. SEE SPECIFICATIONS FOR

ADDITIONAL REQUIREMENTS.

GENERAL NOTES

P

HEATING WATER SUPPLYHWS

HEATING WATER RETURNHWR

TO BE DEMOLISHED

EXISTING TO REMAIN

8" PG PIPE SIZE, SYSTEM AND FLOW TAG

NEW CONNECTION INTO EXISTING PIPE OR DUCT

CAP EXISTING PIPE OR DUCT

KEYNOTE

THERMOSTATT

MECHANICAL SYMBOLS LEGEND

NATURAL GASNG

CW DOMESTIC COLD WATER

PIPE OFFSET DOWN

PIPE OFFSET UP

ELBOW DOWN

ELBOW UP6" PG UP

6" PG DN

PUMP

INVERT ECCENTRIC

REDUCER AS

REQUIRED

SHUTOFF VALVE SEE

SPECIFICATIONS FOR

TYPE (TYP)

STRAINER W/ BLOW

DOWN VALVE & CAP

IN-LINE PUMP

STRAIGHT

ECCENTRIC

INCREASER AS

REQUIRED

DIAMETERS

5 PIPE

PRESSURE GAUGE

WITH 1/4 TURN BALL

VALVES ON EACH

SIDE OF PUMP

BALANCING VALVE

DIAMETERS

5 PIPE

PROVIDE 1/2" STAINLESS SCREEN

ON INTAKE AND VENTS PER

MANUFACTURER'S WRITTEN

RECOMMENDATIONS

EXISTING

STANDING SEAM

METAL ROOF

NOTE: VENTING TERMINATION SHALL BE IN ACCORDANCE WITH EQUIPMENT

MANUFACTURER'S WRITTEN RECOMMENDATIONS

M

IN

(2) 90º ELBOWS

12" MIN AND 24" MAX

M

IN

EXTERIOR FACE

OF PRECAST

CONCRETE

WALL

12'-0" MIN

OFFSET VENTING AND INTAKE IN

CEILING SPACE AS REQUIRED TO

MEET CLEARANCES ON ROOF.

FLASHING SYSTEM FOR

PENETRATIONS SEAL TO METAL

ROOF SYSTEM (TYP.)

EXPANSION TANK

GLYCOL FEEDER

REMOVABLE HEAD

PRESSURE RELIEF

VALVE. ROUTE

RELIEF TO GLYCOL

FEED TANK

ANTI-SIPHON LOOP. TAP

LOOP OFF SIDE OF PIPE;

NOT TOP OR BOTTOM.

2" OR FULL SIZE CONNECTION

ON EXPANSION TANK IF

LARGER

AUTOMATIC

AIR VENT

AIR AND DIRT SEPARATOR W/

INTEGRAL AUTOMATIC AIR

VENT

3/4" HOSE THREAD

ADAPTOR (H.T.A.)

BALANCING VALVE

NOTE: ROUTE PRV/VENTS

TO GLYCOL FEEDER IN

MECH ROOM IN LIEU OF

FLOOR DRAIN

4" CONC PAD

3/4" H.T.A.

PRESSURE

GAUGE

TO GLYCOL

FEED PUMP

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1. PROVIDE MANUFACTURER'S CONDENSATE NEUTRALIZATION KIT FOR EACH BOILER.

REMARKS:

BOILER SCHEDULE - HOT WATER

MARK

SYSTEM

SERVED

CAPACITY (MBH) EFFICIENCY

EWT

(°F)

LWT

(°F) GPM MAX PD (FT) FUEL TYPE

OPERABLE GAS

PRESSURE RANGE

(X - X IN WC)

TURNDOWN

RATIO

ELECTRICAL

DATA

TUPIN TUPTUO SLTVO ESAHP SIASBN GSDIE

B-1 HEATING 180 171 95 75 105 11.3 15.5 NATURAL GAS 2.5 - 14 10:1 120 1 US BOILER UALTA 180

B-2 HEATING 180 171 95 75 105 11.3 15.5 NATURAL GAS 2.5 - 14 10:1 120 1 US BOILER UALTA 180

1. PUMP SHALL BE PROVIDED BY BOILER MANUFACTURER. PUMP IS POWERED THROUGH BOILER.

REMARKS:

MECHANICAL PUMP SCHEDULE

MARK SYSTEM SERVED TYPE GPM HEAD (FT)

SHUT OFF

HEAD (FT)

MOTOR DATA

DESIGN BASIS

APPLICABLE

REMARKSWATTS VOLTS PHASE RPM

HWP-1 MANIFOLD B AND C (GARAGE) INLINE 25 10 30 197 120 1 1750 GRUNDFOS UPS 26-99

HWP-2 MANIFOLD D (MECHANICS BAY) INLINE 10 19 28.5 197 120 1 1750 GRUNDFOS UPS 26-99

HWP-3 MANIFOLD D (WASH BAY) INLINE 7 21 28.5 197 120 1 1750 GRUNDFOS UPS 26-99

HWP-4 BRINE BUILDING INLINE 4 18 24.5 197 120 1 1750 GRUNDFOS UPS 26-99

PHWP-1 BOILER 1 PRIMARY PUMP INLINE 11 18 28.5 197 120 1 1750 GRUNDFOS UPS 26-99 1

PHWP-2 BOILER 2 PRIMARY PUMP INLINE 11 18 28.5 197 120 1 1750 GRUNDFOS UPS 26-99 1

NOT TO SCALED2

BOILER INTAKE/VENT DETAIL

NOT TO SCALED1

IN-LINE PUMP PIPING DETAIL

EXPANSION TANK SCHEDULE

MARK

SYSTEM

SERVED TYPE

TANK

CAPACITY

(GAL)

ACCEPTANCE

CAPACITY

(GAL)

RELIEF VALVE

DESIGN BASIS

RELIEF AT

(PSI) FILL AT (PSI)

ET-1 HEATING BLADDER 53 53 36 12 BELL AND GOSSETT B-200

NOT TO SCALED4

HYDRONIC ACCESSORIES DETAIL

AIR AND DIRT SEPARATOR SCHEDULE

MARK SYSTEM SERVED SIZE (IN)

CAPACITY

(GPM) STRAINER (Y/N) MAX PD (FT) DESIGN BASIS

AS-1 RADIANT HEAT 2 45 N 1 VDN200FA

3. FURNISH AND INSTALL ALL PUMP CONTROLS AND WIRING.

2. CONTRACTOR SHALL PROVIDE GFCI DUPLEX RECEPTICLE NEAR GLYCOL FEEDER FOR POWER.

1. FILL TANK WITH 30% PG. GLYCOL SHALL BE PREMIXED, NO FIELD MIXING SHALL BE ALLOWED.

REMARKS:

GLYCOL FEEDER SCHEDULE

MARK

SYSTEM

SERVED

TANK VOLUME

(GAL) % GLYCOL GPM

PRESSURE RANGES (PSI)

ELECTRICAL

DATA

NI TCU TUO TCU SLTVO ESAHP SIASBN GSDIE

GF-1 HEATING 17 30 1 0 18 240 1 AXIOM DMF300

2026-01-09T16:11:40+0000
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