Thermax Inc.
PRODUCT
DATASHEET
3.0.2-1
Pressure Building Ambient Vaporizers
for Propane Storage Tanks
Thermax Pressure Building Ambient Vaporizers
have been designed especially for maintaining pressure in bulk propane liquid tanks. Liquid from the
bottom of the tank feeds the vaporizer which returns vapor to the top of the tank. The low pressure drop
through the vaporizer ensures tank pressure is maintained during draw-off operations.
Standard Features
Options
ASME B&PV Code, Section VIII U-Stamp
Design pressures exceeding 15,000 psig
Flanged, tongue & groove, butt-weld end
connections
Tank mounting, wall mounting and truck
mounting
Stainless Steel, Monel and other alloy liners
Thermax Inc.
Va p o r i z e rs
H e a t E xch a n ger s
Uses no energy and is self limiting
Greater than 8 inch fin tube center to center
spacing
600 psig MAWP standard
ASME B31.3, CRN (all provinces), and PED
category IV Module compliant
Aluminum corrosion resistant construction
High strength welded aluminum base frame
Horizontal and vertical pressure building units
Horizontal low pressure drop designs maintains
full tank capacity when tank is 2/3 empty
Withstands 100 mph winds and Zone 4 seismic
forces
Pressure Building Ambient Vaporizers
These vaporizers use natural convection of air to vaporize liquefied propane. Vaporization stops as tank
contents reach ambient temperature. Finned aluminum tubes absorb heat from the ambient air and
transfers that heat to produce gas. In addition to our standard aluminum construction, units are available with stainless steel and other alloy liners for high pressure and other liquefied gases.
www.thermaxinc.com Tel. 508-999-1231
Ther m al System s
Cr yogenic Equi pm ent
Vapor Withdrawal Rate for Propane Storage Tanks- SCFH/ft2 Surface Area*
Tank
Pressure
PSIG
Liquid
Temperature
°F
-15°
-10°
-5°
5.5
-30°F
1.38
1.85
2.31
10
-20°F
0.45
0.9
1.38
16
-10°F
-
-
0.45
23
0°F
-
-
-
31
+10°F
-
40
+20°F
-
45
+25°F
-
50
+30°F
-
*Table is a guide only.
Prevailing Air Temperature- °F
0°
+5°
+10°
+20°
+30°
2.8
3.6
4.1
4.6
5.5
1.85
2.31
3.7
4.1
4.6
0.9
1.38
1.85
3.7
4.1
-
0.45
0.9
1.85
3.7
-
0.9
1.85
-
-
0.9
-
-
0.45
-
-
-
Heated Vaporiz er Rang
S
e
e - e Prod-uct
Datash
- eet 2.1 -
-
-
-
For full tanks use local criteria for LP gas service/installation publications for further information.
The ratings cover the “Effective Surface Area” for the Thermax side arm vaporizers models listed.
Thermax Ambient Side Arm Propane Ratings
Model #
Effective
Surface Area*
Dimensions
WxDxH
(inches)
Weight
Lbs.
TF048HF-PBH
113
110 x 20 x 28
100
TF088HF-PBH
227
111 x 42 x 28
196
TF128HF-PBH
338
111 x 53 x 28
287
TF168HF-PBH
451
111 x 70 x 28
385
TF208HF-PBH
564
112 x 88 x 32
506
Since the vaporizers are flooded with propane liquid,
they act as an extension of the storage tank surface
area, which provides the withdrawal vaporization
capacity. To increase the withdrawal rate of the tank
selected for the application:
1. Determine the rate for the full tank using the typical
local criteria
2. To double the tank withdrawal rate select the Thermax
model having the same or more “effective surface area”
TF2010HF-PBH
705
136 x 88 x 32
601
TF2012AHF-PBH
846
160 x 98 x 34
783
TF2015AHF-PBH
1,057
196 x 98 x 34
940
Example 1
TF2812AHF-PBH
1,184
160 x 70 x 52
1,075
TF2815AHF-PBH
1,480
196 x 70 x 52
1,344
TF3212AHF-PBH
1,354
162 x 80 x 52
1,180
TF3215AHF-PBH
1,692
196 x 80 x 52
1,435
TF4015AHF-PBH
2,115
196 x 95 x 52
1,785
A 1,000 gallon tank measures about 41”x16’-0” long, for
a surface area of about 172 sq.ft. To double the full tank
rate, select Thermax model TF088HF-PBH having an
“effective surface area” of 227sq.ft. giving the combined
withdrawal rate 2.3 times the full tank rate.
Note: The side Arm unit is always flooded regardless of
the tank level and maintains its capacity as the tank
empties.
* Vaporizer flow rate will be equal to the withdrawal
rate of a propane storage tank for a tank of the
same surface area as shown.
Example 2
Using the vapor withdrawal table above select a
Thermax model for:
Tank Pressure =10psig,
Air Temperature= +20°F, required vapor withdrawal rate
for the vaporizer is 2,500 SCFH.
1. From table 10 psig tank/ 0°F air vapor withdrawal
rate is 4.1 SCFH/sq.ft.
2. Divide 2,500 SCFH/4.1=610 sq.ft. Select Model
TF2,010AHF-PBH which has an “effective” area of
705 sq.ft.
NOTE: The Ambient Side Arm unit is always flooded
regardless of tank level and maintains its capacity as
the tank empties.
Thermax Inc.
540 Hawthorn St.,
Dartmouth, MA 02747 USA
+1 508 999 1231
[email protected]
www.thermaxinc.com
Propane Properties
Boiling Point
-44° F
Density Gas
0.117lb/ft3 (60°F)
Density Liquid
4.17lb/gal (60°F)
Heat of Vaporization (0°F)
Heat of Combustion
172 Btu/lb
2,500 Btu/scf
Specific Heat, Gas (60°F)
0.473 Btu/lb°F
Specific Heat, Liquid
0.411 Btu/lb°F
© Copyright Thermax Inc. 2014
All Rights Reserved
DS 3.0.2-1 REVISION 06/14