HomeMy WebLinkAboutSpec Sheets1NDEECO"
. _•
Calculations for closed top, outdoor tank losses based on NFPA-22 standards for
water tanks for private fire protection (2023) (See sheet 2)
Inputs
CafcufaYed
NFPA-22 CALCULATIONS
Application information
(WORKING PROGRAM, IN DEVELOPMENT)
PROJECT:
25-095 Spartan -Silt, CO
DATE:
1 10/31/2025
Tank height, ft.
21.31
FT
FT
FT
STEP 1 INPUT
Tank diameter, ft.
21.65
Cone height, ft. (use 0 if flat top)
6.37
Ambient °F
-10
-F
-F
-F
STEP 2
Set point (427 for NFPA standard)
42
A T
S2,
Insulation R value (0.5 minimum uninsulated steel)
14
STEP 3 (STEP 4
INPUT)
Wind speed (mph)
35
MPH
STEP 5 INPUT
Wind speed multiplier
y4.
IUP I IUN 11 Surface area for vertical tank, FLAT nOTTOM AND FLAT TOP
(A) FIaL Bottom and Top Surface Area 7 5 89 IF[ 12 SiFP 1 RESUI I
Side tank, 1, d h 1,4A8 6u^ FF^7
ft2 (I LAT BOTTOM AND TOP NFuo I - — �� I rA) OP f10 11
[OPTION 21 Surface area for vertical tank, FLAT BOTTOM AND CONE TOP
(A) Flat Bottom
367.9.5
FTA2
1 FTA2
FTA2
FTA2
STEP 1 RESULT
(OPTION 2)
(B) Cone Top
584.47
(C) Side tank, ¶ d h
1,748,6$
Total area, ft2 (FLAT BOTTOM, CONE TOP NFPA STANDARD)
2,401.09
BTU losses
Area Used (from above option 1 or 2) 2,401.09 FTA2 OPTION 2
Total area ft2 X AT R 8,918-33 BTU STEP 4 RESULT
Add 5%and Wind speed Multiplier
Losses in BTU with 5%SF and wind adders 10,768,88 BTU I STEP 5 RESULT
Convert to KW and add 10%
KW Required Vertical Tank 3.472 KW I STEP 6 RESULT
KW Required Horizontal Tank' ;4. KW
39 Max
INDEECO Standard Safety Factor is 20% reflecting wattage tolerance +5/-10% and voltage - S%
ELECTRIC HEATER SAFETY FACTOR (OUR MANUFACTURER
KW Recommended Horizontal Tan 4;542 RECOMMENDATION) (BEYOND NFPA STANDARD CALLS) r`
' Wind speed adjustments range 21 mph to 35 mph
INDEECO additional SF is 20% reflecting wattage tolerance +5/-10% and voltage - 5%
One inch fiberglass insulation with jacket assumed about R=3.5, 2" insulation about R=7
1 Horizontal tanks, the cone rise is assumed to be on both ends
Direct NFPA calculation number (see notes on background page)
PERMAFROST AREA ADJUSTMENTS (IF NECESSARY, ENTER EXPECTED GROUND TEMPERATURE)
Surface area for vertical tank (ONLY AREA EXPOSED TO AMBIENT)
Side tank, $ d h 1445.7 FTA2 STEP 1 RESULT
Cone top 584,5 d FTA2
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