GRPS CA FROST Boiler Replacement Addendum 1.pdf
PDF 4 MB Posted
- Solicitation number
- RFP GRP 260000002090 2
- Issued by
- Kent County, Grand Rapids City, Michigan
About this file
This is an Addendum 1 to a boiler replacement project for Grand Rapids Public Schools' C.A. Frost Environmental Science Middle High School, issued by WPF Engineering, LLC. The addendum, dated June 2, 2026, provides clarifications and revisions to the mechanical design drawings (M101, M102, and M103) for the replacement of existing boiler equipment at the facility located at 1417 Covell Avenue NW, Grand Rapids, Michigan 49504. Key revisions include updated mechanical floor plans showing demolition of existing gas lines and relocation of the 3" hot water return line; new natural gas piping configuration with elevated pressure (.5 psig) serving the new boilers and two new gas regulators to reduce pressure for existing equipment; relocation of existing 3" HWR piping for boiler stack and combustion air clearance; revised boiler stacks and combustion air routing with updated roof penetration locations; corrected boiler pump flow direction symbols; updated boiler piping schematic with specified gas piping sizes; revised curb details with concrete pad construction notes; updated boiler room section; and revised mechanical equipment list to include new pressure relief valves (PRV-2 and PRV-3). The proposal submission deadline remains unchanged at Tuesday, June 9, 2026, at 1:00 p.m. No requests for information (RFIs) were submitted.
The addendum includes a pre-proposal meeting sign-in sheet and detailed mechanical drawings at scales of 3/8" = 1'-0" and 1/2" = 1'-0". The project involves replacement of an existing Smith cast iron boiler with 1,985 MBH output with new boiler equipment (B-1, B-2, with provisions for future boiler B-3), new system pumps (P-3 and P-4 rated at 250 GPM each), a new hydraulic separator (HS-1), and associated piping and controls. The existing expansion tank and shot feeder are to be salvaged and reinstalled. Mechanical specifications include new 4" combination flow indicator and balance valves, new 6" concrete pad, new 8" stainless steel flue stack, 8" PVC combustion air intake, pressure relief components, and a condensation neutralization tank (15 GPH) shipped with the boiler. WPF Engineering, LLC maintains all rights to the 2026 project design.
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| GRPS CA Frost Boiler Replacement Ad to Bid.pdf |
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900 Union Avenue NE · Grand Rapids, MI 49503 · Phone (616) 819-3010 · Fax 616-819-3014
Addendum 1
FACILITIES AND OPERATIONS
Date: June 2, 2026 Project: Grand Rapids Public Schools 2023 Bond Projects C.A. Frost Boiler Replacement Project
Attachments:
Pre-proposal meeting sign-in sheets Drawing Pages: M101, M102, and M103
General Clarifications:
I. Drawing Sheet M101 (Reissued):
A. Misc updates on the Enlarged Boiler Plan Existing showing demo of existing gas lines and demo for relocation the existing 3” hot water return line at stack penetration.
B. Revise new natural gas piping as shown to allow elevated gas pressure (.5 psig) gas to the new boilers. Add 2 new gas regulators on the existing 2” and 3” lines to reduce pressure from ..5psig to 7” WC serving the existing equipment. Re-pipe 2 existing lines from the high pressure 3” to the existing 3” downstream of the new regulator.
C. Relocate the existing 3” HWR piping to allow adequate clearance for the new boiler stacks and combustion air piping.
D. Revise boiler stacks and combustion air routing. Coordinate with the existing piping and the revised location of the roof penetration.
II. Drawing Sheet M 102 (Reissued) A. Updated some incidental piping in the Existing Boiler Piping Schematic.
B. Add gas piping sizes to each boiler.
C. Revise boiler pump symbol to the correct direction of flow.
III. Drawing Sheet M103 (Reissued):
A. Revise the Curb Detail as show.
B. Add concrete pad construction notes
C. Revise Boiler Room Section for new stack and combustion air routing. Coordinate with the existing piping.
D. Update the Mechanical Equipment List to include new PRV’s 2 and 3.
E. Add detail Open Frame in Existing Roof.
RFIs:
Q1. None
Proposals are due, Tuesday, June 9th at 1p. This date remains unchanged.
END OF ADDENDUM
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© WPF ENGINEERING, LLC 2026
ALL RIGHTS RESERVED
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DATE ISSUED FOR
D.B.
A.B.
DRAWING NUMBER
DRAWING NAME
5.19.26 Owner Review
5.26.26 Bids & Constr.
6.02.26 Addendum #1
N.T.S.
KEY PLAN
CA FROST ENVIRONMENTAL SCIENCE MIDDLE HIGH SCHOOL
BOILER REPLACEMENT PROJECT
TABLE OF CONTENTS
GRAND RAPIDS PUBLIC SCHOOLS
CA FROST
1417 Covell Ave. NW, Grand Rapids, MI 49504
M101 New and Demolition Mechanical Floor Plans M102 New and Demolition Boiler Piping Schematics M103 Mechanical Schedules, Section and Details
E-001 Electrical General Information E-002 Electrical Sheet Specification E-101 Electrical Power Floor Plans
TB
JS
COVER
TABLE OF
CONTENTS &
MAP
AutoCAD SHX Text
AUER NGINEERING
M
EX.1"NAT. GAS
EX. GAS METER
M
EXIST.
3" GAS
EXIST.
2" GAS
EXIST.
MISC. VENTS
UTILITY
REGULATOR
VENT
EX. 2" GAS
EX. 3" GAS
EX. COMBUSTION
M
EX.1"NAT. GAS
VENT
EX. GAS METER
NEW
PRV-3
EX. 2" GAS
EX. 3" GAS
EX. COMBUSTION
AIR INTAKE PLENUM
EX. SECURITY
PANEL
EX. BRKR
PANEL
EX
IS
TI
N
G
EX. BRKR
PANEL
EX.
JUNCTION
BOX
EX. EXP.
TANK
EX.HWR
HTR NEW MAGNETIC HYDRAULIC
SEPARATOR HS-1(4") REFER TO
SCHEMATIC. SUPPORT OFF
FLOOR WITH ANGLE IRON
FRAME (FIELD FABRICATE)
EX. 3" NAT GAS
EX. FLOOR
DRAIN
EX.1"NAT. GAS
VENT
EX. HW
UNIT
HEATER
H W
R H
W S
H W
S H
W S
1" COLDWATER
MAKE-UP
EXIST.
RPZ
NEW 4"
COMBINATION FLOW
INDICATOR &
BALANCE VALVE.
VICTAULIC OR
B&G(TYPICAL)
R
PZ
P-4
GPM
BUTTERFLY VALVE(TYP.)
CHECK VALVE(TYP.)
4"x2.5" REDUCER(TYP.)
P-3 (SUPPORT PUMP WITH
FLANGE SUPPORT FROM PUMP
MANUFACTURER)
250 GPM
EXIST. SHOT FEEDER,
RE-INSTALL
4" HWS
4" HWS DN
AUTO AIR VENT
FURNISHED WITH HS-1
EXIST. EXPANSION
TANK, RE-INSTALL
4" HWS
& HWR 4" HWS DN
4" HWR DN
4" HWR DN
4"
4" SIDE STEAM TO SHOT FEEDER
FUTURE
BOILER B-3
B-2
B-1
P-2
GPM
P-1
GPM
EXIST.
4" HWS
EXIST.
4" HWR
4" HEADER
NEW 6"
CONC. PAD
NEW ROOF
CURB (REFER
TO SECTION)
NEW 8"
COMB. AIR
NEW 8" SS
FLUE
NEW 4"
COMBINATION FLOW
INDICATOR &
BALANCE VALVE.
VICTAULIC OR B&G
EXIST.
3" HWR
OFFSET 3" HWR TO
CLEAR ROOF OPENING
FOR BOILER FLUES
EXIST.
4" CWS & R
(APPROX. 107"A.F.F.)
APPROX.
LOCATION
OF JOIST
NEW
PRV-3
EX. 3" NAT GAS
EX. DOM. CW
NEW
3"GAS
NEW
PRV-2 EX. 1" NAT GAS
EX. ELEC.
CONDUIT
EX. 3" GAS
EX. COMBUSTION
AIR INTAKE PLENUM
EX. SECURITY
PANEL
EX. BRKR
PANEL
EX
IS
TI
N
G
EX. BRKR
PANEL
EX. JUNCTION
BOX
EX. EXP.
TANK
EX.HWR
HTR
EX.14"Ø STACK
THRU ROOF
EXISTING
BOILER
EX. CONC. PAD
EX.16"Ø AIR
SEPARATOR
(SALVAGE)
EX
.4
"H W
S
4"HWR
EX. 4"HWS DN
BELOW 3-WAY
VALVE
EX. 3" NAT GAS
EX
.4
"H W
S
EX. DRAIN TRENCH
EX. FLOOR
DRAIN
EX. BOILER
BURNER
EX.1"NAT. GAS
VENT
EX. HW
UNIT
HEATER
EX. BOILER
PUMP
EX. 3" HWR
(APPROX. 137"A.F.F.)
H W
R H
W S
H W
S H
W S
EX.SHOT
FEEDER
(SALVAGE)
EX. EXPANSION
TANK (SALVAGE)
EXIST. CW
WITH RPZ
TO REMAIN
EX. 4"HWR
R
PZ
EXIST.
4" CWS & R
(APPROX. 107"A.F.F.)
EX. ELEC.
CONDUIT
THE EDGE OF THE
ROOF OPENING
LINES UP WITH THE
CHIMNEY.
APPROX.
LOCATION
OF JOIST
EX. PLUG TEE
EX. FLANGE
CONN.
EX. 3" NAT GAS
EX. DOM. CW
EX. 1" NAT GAS
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© WPF ENGINEERING, LLC 2026
ALL RIGHTS RESERVED
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DATE ISSUED FOR
D.B.
A.B.
DRAWING NUMBER
DRAWING NAME
5.19.26 Owner Review
5.26.26 Bids & Constr.
6.02.26 Addendum #1
ENLARGED BOILER PLAN - EXISTING ENLARGED BOILER PLAN - NEW WORK
N.T.S.
KEY PLAN
TB
JS
M101
NEW & EXISTING
MECH. BOILER
PLANS
A1
A1
A1
AutoCAD SHX Text
AUER NGINEERING
AutoCAD SHX Text
NORTH
AutoCAD SHX Text
SCALE: 3/8" = 1'-0"
AutoCAD SHX Text
NORTH
SCALE: 3/8" = 1'-0"
B E
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© WPF ENGINEERING, LLC 2026
ALL RIGHTS RESERVED
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DATE ISSUED FOR
D.B.
A.B.
DRAWING NUMBER
DRAWING NAME
5.19.26 Owner Review
5.26.26 Bids & Constr.
6.02.26 Addendum #1
EXISTING BOILER PIPING SCHEMATIC
EXIST.
EXP.
TANK
EXIST.SHOT
FEEDER
EXIST. SYS.
PUMP P-1
100 GPM
EXIST. SYS
PUMP P-2
100 GPM3" HWR
4" HWS
3" HWS
DECOUPLER
EXISTING SMITH C.I. BOILER
(1,985 MBH OUTPUT)
OPEN TRENCH
TO DRAIN
EXISTING PAD
EXIST. BOILER
PUMP P-3
100 GPM
EXISTING 3"
GAS SUPPLY
(12" WC)
FLOOR
DRAIN
16"Ø
STACK
3" HWR
3" HWS
AIR VENT
EXIST. AIR
SEPARATOR
CW MAKE-UP
2"
2"
4" HWR
3" HWS&HWR
4" HWR 4"
EXIST.
FILTER
4" HWR
2" HWS
&HWR
NEW BOILER PIPING SCHEMATIC
EXIST. EXP.
TANK ET-1
(RE-INSTALL)
NEW SYS.
PUMP P-3
250 GPM
NEW SYS
PUMP P-4
250 GPM
EXIST.
3" HWR EXIST.
4" HWS
EXIST.
FLOOR
DRAIN
EXIST.
3" HWS
EXIST. 3" HWS&HWR
4" HWR
NEW
4"HWR
4" HWR
2" HWS
&HWR
NEW 1"
HS-1
NEW HYDRAULIC
SEPARATOR.
SUPPORT WITH
ANGLE IRON STAND
NEW
4"HWR NEW
4"HWS
4"HWS
BABCO GAGE KIT
NEW
BOILER
B-1
NEW
BOILER
B-2
NEW GAS COCK
NEW PRESS. REC.
PRV-1
BOILER PUMP P-1
(125 GPM)
6" FLUE COLLAR
SEE DETAIL.
2"
BUTTERFLY
VALVE(TYP.)
TEMP. GAGE
BABCO GAGE KIT
NEW
4"HWS
2" GAS
CONNECTION
2" DRAIN
2" COND
4"HWR
NEW
4"HWS
NEW
4"HWR
COND.
NEUTRALIZATION
TANK (15 GPH)
SHIPPED WITH BOILER
2"
4"HWR
BOILER PUMP P-2
(125 GPM)
NEW PRESS. REC.
PRV-1
LOW WATER
CUT-OUT
PRF'S
RELIEF
AIR VENT
NEW 6" CONC. PAD
SEE DETAIL.
BOILER
DRAIN VALVE
ITEMS SHIPPED
LOOSE WITH BOILER
FLOW & BALANCE VALVE
FUTURE
BOILER
B-3
4" VALVED & CAPPED
CONNECTIONS FOR
FUTURE BOILER
RPZ
EXIST. CW & BACKFLOW
PREVENTER
COMBUSTION AIR KIT
SHIPPED WITH BOILER,
FIELD INSTALLED.
4"x21
2" RED
4"HWS
TB
JS
M102
NEW & EXISTING
BOILER PIPING
SCHEMATICS
4"
2" 2"
AutoCAD SHX Text
AUER NGINEERING
AutoCAD SHX Text
SCALE: NONE
SCALE: NONE
NEW CONCRETE
INFILL & 6" PAD
EXIST. BOILER PAD
B-1B-2FUTURE B-3
EXIST. FLOOR DRAIN
TO REMAIN.
EXIST. TRENCHEDGE OF
EXIST. PAD
B-1B-2FUTURE B-3
EXIST. TRENCH
APPROX. 12"
6" HIGH NEW PAD
NEW CONCRETE
B-1B-2FUTURE
B-3
DISCHARGE NOZZLE
PATE CURB
PC-2MB-B
(OR SIMILAR)
2"
GAS
BPS-1
8" FLUE(10"OD)
CAI-1
8"Ø COMB. AIR
SEE DETAIL
THIS SHEET.
RELOCATE 3" HWR
(APPROX. 137"A.F.F.)
SLOPE
SLOPE
CHIMNEY
EXISTING PAD
EXIST. ROOF
JOISTS
EXIST. CHWS&R
(APPROX. 9'-0"A.F.F.)
NEW 3" GAS
HEADER
PIPE RELIEF
TO DRAIN
8"Ø PVC
COMB. AIR
8"Ø DBL SS WALL
VENT STACK
ROOF JOIST
(APPROX.
LOCATION)
COMB. AIR
FLUE
PATE ROOF CURB
WATER DAM
(CRICKET)
JO
IS
T
SP
AC
IN
G (A
PP
R
O X.
LO
C
AT
IO
N S)
ROOF JOIST
(APPROX.
LOCATION)
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© WPF ENGINEERING, LLC 2026
ALL RIGHTS RESERVED
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DATE ISSUED FOR
D.B.
A.B.
DRAWING NUMBER
DRAWING NAME
5.19.26 Owner Review
5.26.26 Bids & Constr.
6.02.26 Addendum #1
BOILER PAD DETAILBOILER ROOM SECTION
TB
JS
M103
MECH. SCHEDULE,
SECTION, DETAILS
AND EQUIP. LIST
CURB DETAIL
A1
A1
A1
A1
A1
AutoCAD SHX Text 1'-8"
AutoCAD SHX Text 1'-6"
AutoCAD SHX Text 6"
AutoCAD SHX Text 2'-5 "12"
AutoCAD SHX Text 1'-6"
AutoCAD SHX Text 2'-5 "12"
AutoCAD SHX Text 1'-6"
AutoCAD SHX Text 2'-5 "12"
AutoCAD SHX Text 11'-2 "12"
AutoCAD SHX Text 1'-8"
AutoCAD SHX Text 1'-2"
AutoCAD SHX Text 11'-2 "12"
AutoCAD SHX Text 1'-6"
AutoCAD SHX Text 3'-0"
AutoCAD SHX Text 1'-0"
AutoCAD SHX Text 1'-0"
AutoCAD SHX Text 2'-0"
AutoCAD SHX Text 3'-0"
AutoCAD SHX Text 4'-0"
AutoCAD SHX Text 10"
AutoCAD SHX Text 1'-4"
AutoCAD SHX Text 1'-2"
AutoCAD SHX Text 1'-2"
AutoCAD SHX Text 4'-0"
AutoCAD SHX Text
AUER NGINEERING
AutoCAD SHX Text
SCALE: 1/2"=1'-0"
AutoCAD SHX Text
SCALE: 3/8"=1'-0"
SCALE: 1"=1'-0"
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