Piano and vocals to Broken Vessels by Hillsong United
Piano and vocals to Broken Vessels by Hillsong United
Full description
FIRE OR THERMAL EXPANSION SIZING FOR VAPOR / GAS FILLED VESSELS
The relieving temperature and the required orifice area for a PRV on vapor/gas filled vessels exposed to external flames or heat source can be determined using the following formulae: FORMULAE
TR
A
F
TO
=
A
≡
Calculated PRV orifice area (in 2)
F
≡
Environmental Operating Factor
AW
≡
Exposed external surface area (ft 2)
TO
≡
Operating Temperature (°R)
TR
≡
Reli Reliev eviing Temperat rature ure (°R)
TW
≡
Max Maximum imum Wall Temperat rature ure (° (°R)
[TW - TR]1.25
PO
≡
Operating Pr Pressure (p (psig)
TR0.6506
PR
≡
Relieving Pressure at PRV Inlet (psia)
C
≡
Gas Constant
K
≡
Discharge Coefficient for Relief Valve
Where:
PO F
=
=
PR
AW
(PR)½ 0.1406 C ∙ K
∙
DATA INPUT & CALCULATION
Tag Number
PSV-1370-2
Set Pressure
1750.00
psig
1450.00
psig
Atmospheric Pressure
14.70
psi
Allowable Overpressure %
21%
Pressure Loss from Vessel to PRV
5.00
psi
Operating Pressure
PO
psia will be used in calcs
Relieving Pressure @ PRV
PR
2127.20
psia
Note 1
Operating Temperature
TO
304
°F
°R will be used in calcs
Maximum Wall Temperature
TW
1100
°F
Note 2
Relieving Temperature
TR
1110
Note 4
Exposed External Surface Area
AW
9200.0
°F ft2
Gas Constant
C
344
Discharge Coefficient
K
0.9750
Operating Factor
F
0.0100
Calculated PRV Orifice Area
A
1.9947
Note 3 in2
NOTES :
1)
Relieving Pressure at the PRV inlet is (P set - Ploss + Poverpressure + Patmospheric) psia
2) For Carb Carbon on Stee Steel, l, 1100 1100 °F is is typica typically lly use used. d.
21362468.xls
08/24/2009
3)
The recommended minimum value for F is 0.01 and this value will be used if the calculated value comes in lower.
4)
Relief temperature temperature greater than maximum wall temperature. temperature. Consider reducing set pressure.
