0122008_SteamCalcs_TempBoilerSys_REV0.pdf
PDF 259 KB Posted
- Solicitation number
- 36C24826R0090
About this file
This document is a technical calculation report for feedwater pump sizing related to a temporary boiler system for the Miami VA Medical Center HVAC System Upgrade & Expansion B44 project (VA Project Number 546-22-110, Above Group Project Number 0122008). Prepared by Geoff Chenoweth on April 29, 2026, the calculations establish the steam plant requirements for a 90 PSIG (pounds per square inch gauge) system operating at 100 PSIG with a boiler capacity of 500 HP and actual output of 16,830 PPH (pounds per hour).
The report presents two design scenarios: an 80% maximum condensate return scenario and a 0% minimum condensate return scenario. In the maximum condensate return case, the system requires softwater at 3,300 PPH (6.6 GPM), returned condensate of 12,733 PPH (26.1 GPM), and feedwater discharge of 17,335 PPH (36.4 GPM). Pump specifications include a condensate pump rated at 130 TDH (total dynamic head) with 2 HP, a 90 feedwater pump at 480 TDH with 10 HP, and a 250 feedwater pump at 820 TDH with 25 HP. In the minimum condensate return scenario, softwater requirements increase to 14,284 PPH (28.6 GPM) while condensate drops to 139 PPH (0.3 GPM), with feedwater remaining constant at 17,335 PPH. The calculations apply conservation of mass and energy equations, with feedwater temperature maintained at 227°F and steam enthalpy at 1,190 BTU/LB, supporting a deaerator operating at 5 PSIG.
View the file
Other files
| File | Type | Posted |
|---|---|---|
| Link To Attachments 8-10.docx | DOCX document | |
| 01 51 24 - TEMP STEAM GENERATING FACILITIES_CONTROLS_2026-04-29.pdf | ||
| Amendment 0001 - 36C24826R0090.pdf | ||
| RFI Response.pdf |
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
FEEDWATER PUMP SIZING (90 PSIG SYSTEM)
PLANT CALCULATIONS FOR:
MIAMI VA MEDICAL CENTER
HVAC SYSTEM UPGRADE & EXP. B44
No. Revision Date
1 4/29/2026
April 29, 2026
Prepared By: Geoff Chenoweth
Reviewed By: Geoff Chenoweth
Approved By: Geoff Chenoweth
Requested Change by VA
Calculations/Steam Plant
Project: HVAC System Upgrade & Exp. B44
VA Project Number: 546-22-110
Above Group Project Number: 0122008
Current Phase: Temporary Boiler Sizing
TITLE Page 1
FEEDWATER PUMP SIZING (90 PSIG SYSTEM)
PROJECT SUMMARY
SYSTEM FLOWS:
PPH GPM Cond. Return Rate Notes:
Softwater Required SWr 22,984 46 0% Maximum Softwater Demand
Returned Condensate COND 25,213 52 100% Maximum Condensate Return
Steam to Deaerator STEAM 4,674 --- 0% Low Pressure Steam To The Deaerator
Steam to Campus StC 25,213 --- 100% Maximum Steam to Campus
Feedwater FEED 27,658 58 0% Deaerator Discharge
Recirc Total Flow Head Motor Power
% GPM TDH HP
Condensate Pump 30 130 2
90 Feedwater Pump 40 480 10
250 Feedwater Pump 80 820 25
Feedwater Temp 227 °F
Enthalpy of Water 195 BTU/LB
Steam Operating Pressure 100 PSIG
Enthalpy of Steam 1190 BTU/LB
Boiler Capacity 33475 BTUH/HP
Boiler Rating 500 HP
Nom. Boiler Cap. @ 212°F 16738 PPH
Actual Boiler Cap. @ Pressure 16830 PPH
Qty. of Boilers Running 1
Total Capacity 16830 PPH
Calculations/Steam Plant
Project: HVAC System Upgrade & Exp. B44
VA Project Number: 546-22-110
Above Group Project Number: 0122008
SUMMARY Page 2
80 % CONDENSATE RETURN
170° F CONDENSATE
Design Condition for Condensate System
INPUT DATA:
DATA SYMBOLS VALUE UNITS SOURCE NOTES
Boiler Steam Output SO 16,830 PPH GIVEN
Continuous Blowdown Rate CBD 3% % ASSUMED
Campus Condensate Return Rate CCrr 82% % GIVEN
Average Condensate Temperature CDt 170 ºF GIVEN
Average Softwater Temperature SWt 70 ºF GIVEN
Deaerator Pressure Dap 5 PSIG KNOWN
Parasitic Steam Load PAR 2,000 PPH ASSUMED
Desuperheating Flow DeSup 0 PPH ASSUMED
EQUATIONS:
Steam to Campus StC SO - STEAM - PAR
Feedwater Flow FEED DeSup + SO + (SO*CBD)
Returned Condensate COND StC * CCrr
Conservation of Mass Equation:
Conservation of Energy Equation:
CALCULATIONS:
MASS TEMP ENTHALPY ENERGY
SYMBOL m T h mh
CONDENSATE COND 12,733 170 138 1,756,965
SOFTWATER SOFT 3,300 70 38 125,652
PUMPED CONDENSATE MU 16,032 149 117 1,882,618
STEAM STEAM 1,302 227 1,156 1,505,164
FEEDWATER FEED 17,335 227 195 3,387,782
0 -
RESULTS:
Steam to Campus StC 15,528 PPH CALCULATED
PPH GPM
Softwater Required SOFT 3,300 6.6
Returned Condensate COND 12,733 26.1
Returned to the Deaerator MU 16,032 32.7
Feedwater FEED 17,335 36.4
* - Calculated on different sheet.
Assumptions:
Deaerator vent losses not accounted for.
Deaerator Steam is assumed to be saturated.
FEEDSTEAMSOFTCOND
mmmm &&&& =++
FEEDSTEAMSOFTCOND
hmhmhmhm &&&& =++
Calculations/Steam Plant
Project: HVAC System Upgrade & Exp. B44 VA Project Number: 546-22-110
Above Group Project Number: 0122008
DA - Max Cond Return Page 3
0 % CONDENSATE RETURN
170° F CONDENSATE
Design Condition for Softwater System
INPUT DATA:
DATA SYMBOLS VALUE UNITS SOURCE NOTES
Boiler Steam Output SO 16,830 PPH GIVEN
Continuous Blowdown Rate CBD 3% % ASSUMED
Campus Condensate Return Rate CCrr 1% % GIVEN
Average Condensate Temperature CDt 170 ºF GIVEN
Average Softwater Temperature SWt 70 ºF GIVEN
Deaerator Pressure Dap 5 PSIG KNOWN
Parasitic Steam Load PAR 0 PPH ASSUMED
Desuperheating Flow DeSup 0 PPH KNOWN*
EQUATIONS:
Steam to Campus StC SO - STEAM - PAR
Feedwater Flow FEED DeSup + SO + (SO*CBD)
Returned Condensate COND StC * CCrr
Conservation of Mass Equation:
Conservation of Energy Equation:
CALCULATIONS:
MASS TEMP ENTHALPY ENERGY
SYMBOL m T h mh
CONDENSATE COND 139 170 138 19,205
SOFTWATER SOFT 14,284 70 38 2,665
PUMPED CONDENSATE MU 14,423 71 39 21,871
STEAM STEAM 2,912 227 1,156 3,365,912
FEEDWATER FEED 17,335 227 195 3,387,782
0 0
RESULTS:
Steam to Campus StC 13,918 PPH CALCULATED
PPH GPM
Softwater Required SOFT 14,284 28.6 CALCULATED
Returned Condensate COND 139 0.3 CALCULATED
Returned to the Deaerator MU 14,423 28.9 CALCULATED
Feedwater FEED 17,335 36.4 CALCULATED
* - Calculated on different sheet.
Assumptions:
Deaerator vent losses not accounted for.
Deaerator Steam is assumed to be saturated.
FEEDSTEAMSOFTCOND
mmmm &&&& =++
FEEDSTEAMSOFTCOND
hmhmhmhm &&&& =++
Calculations/Steam Plant
Project: HVAC System Upgrade & Exp. B44 VA Project Number: 546-22-110
Above Group Project Number: 0122008
DA - Min Cond Return Page 4
DA - Min Cond Return Page 5
DA - Min Cond Return Page 6
File details come from the government source that posted it. Updated .