## Vessel Pressure

## Vessel Pressure

(OP)

HELLO,

in order to do calculation basic on thickness calculation to separator. i do all the input in details (nozzles, manhole,saddle) i entered all the reinforcing of nozzles, the internal pression, temperature,allowable corrosion, diameter,thickness, the classes of flanges

but my problem is in the results (output):

i use a pressure of 6 bars but in calculation the pressure is defferent and with sign (-)

look here:

Required Thickness due to Internal Pressure [tr]:

= (P*Do*Kcor)/(2*S*E+2*P*(Kcor-0.1)) per Appendix 1-4 (c)

= (-16.801*1430.0000*0.994)/(2*-0.3E+07*1.00+2*-16.801*(0.994-0.1))

= -109.8021 + -84.0000 = -193.8021 mm

Max. Allowable Working Pressure at given Thickness, corroded [MAWP]:

= (2*S*E*t)/(Kcor*Do-2*t*(Kcor-0.1)) per Appendix 1-4 (c)

= (2*-0.3E+07*1.00*-224.0000)/(0.994*1430.0000-2*-224.0000*(0.99-0.1))

= -34.452 N/mm²

in order to do calculation basic on thickness calculation to separator. i do all the input in details (nozzles, manhole,saddle) i entered all the reinforcing of nozzles, the internal pression, temperature,allowable corrosion, diameter,thickness, the classes of flanges

but my problem is in the results (output):

i use a pressure of 6 bars but in calculation the pressure is defferent and with sign (-)

look here:

Required Thickness due to Internal Pressure [tr]:

= (P*Do*Kcor)/(2*S*E+2*P*(Kcor-0.1)) per Appendix 1-4 (c)

= (-16.801*1430.0000*0.994)/(2*-0.3E+07*1.00+2*-16.801*(0.994-0.1))

= -109.8021 + -84.0000 = -193.8021 mm

Max. Allowable Working Pressure at given Thickness, corroded [MAWP]:

= (2*S*E*t)/(Kcor*Do-2*t*(Kcor-0.1)) per Appendix 1-4 (c)

= (2*-0.3E+07*1.00*-224.0000)/(0.994*1430.0000-2*-224.0000*(0.99-0.1))

= -34.452 N/mm²

## RE: Vessel Pressure

## RE: Vessel Pressure

## RE: Vessel Pressure

Also, the numerator portion (P*Do*K) looks like it should work out to

The final result is a simple division problem A/B = C thickness

If you are using Excel, you may need to insert some ( ) to force the software to do the math in the correct order.

Quote: "Sometimes, the biggest problems are caused by the smallest things. Pay Attention!" (Unknown)