Design Pressure and MAWP

[deep79pk]

Any one know about that MAWP may be greater than Design Pressure in case of Pressyre vessels?
Thanks
Aamir

[thaihy]

My favorite topic. I can briefly summary as follows:

1 - Process simulation in worst case having highest operation pressure ---> MOP (Maximum operating pressure)

2- MOP + Margin... ---> Design pressure (DP)

3 - DP ----> wall thickness (wt0)

4 - wt0 + corrosion allowance thickness ... ----> min Wt (wt1): real WT

5 - wt1 ----> MAOP (or MAWP) by the same formula with step 3

Discussion: New vessel : MAWP > DP. during long period of operation, erosion and corrosion may occur cause significantly reducing in WT ---> recalculate MAWP (a function of real WT) ----> Old vessel: MAWP may/may not < DP ---> consider 1 MOP < MAWP.

Sometime, vessel can operate at pressure which is higher than DP but always kept lower than MAWP.

Conclusion:

MOP < MAOP (MAWP)

MOP </> DP

DP </> MAWP

MAWP is the most important pressure of vessel.

[M5416]

MAWP in anytime shall be larger or equal to DP, otherwise the vessel need repaired, re-rated or retired.

[Abdel Halim Galala]

See the following links to CR4 Forum:
-

[link Point to another website Only the registered members can access] -

[link Point to another website Only the registered members can access] -

[link Point to another website Only the registered members can access] -

[link Point to another website Only the registered members can access] -

[link Point to another website Only the registered members can access] -

[link Point to another website Only the registered members can access] - and more if you need

[javan]

My favorite topic. I can briefly summary as follows:

1 - Process simulation in worst case having highest operation pressure ---> MOP (Maximum operating pressure)

2- MOP + Margin... ---> Design pressure (DP)

3 - DP ----> wall thickness (wt0)

4 - wt0 + corrosion allowance thickness ... ----> min Wt (wt1): real WT

5 - wt1 ----> MAOP (or MAWP) by the same formula with step 3

Discussion: New vessel : MAWP > DP. during long period of operation, erosion and corrosion may occur cause significantly reducing in WT ---> recalculate MAWP (a function of real WT) ----> Old vessel: MAWP may/may not < DP ---> consider 1 MOP < MAWP.

Sometime, vessel can operate at pressure which is higher than DP but always kept lower than MAWP.

Conclusion:

MOP < MAOP (MAWP)

MOP </> DP

DP </> MAWP

MAWP is the most important pressure of vessel.

Very Good