[MW:1842] RE: 1839] MWAP, Design Pressure, MDMT and Design Temperature

Maximum Allowable Working Pressure (MAWP): It is the maximum permissible pressure at the top of the vessel in its normal operating position at a specific temperature, usually the design temperature (this is what the designated temp you are asking)

When calculated, the MAWP should be stamped on the nameplate. The MAWP is the maximum pressure allowable in the “hot and corroded’ condition. It is the least of the values calculated for the MAWP of any of the essential parts of the vessel, and adjusted for any difference in static head that may exist between the part considered and the top of the vessel.

 

Design Pressure: The pressure used in the design of a vessel component for the most severe condition of coincident pressure and temperature expected in normal operation. For this condition, and test condition, the maximum difference in pressure between the inside and outside of a vessel, or between any two chambers of a combination unit, shall be considered. Any thickness required for static head or other loadings shall be additional to that required for the design pressure.

 

Design temp: Generally it is the temp that corresponds to deign pressure. Vessels are designed for both max and min design temperatures.

Design temperature for vessels under external pressure shall not exceed the maximum temperatures given on the external pressure charts.

 

The MDMT or Minimum design metal temperature is the lowest temp expected in service or the lowest allowable temp calculated for each individual part. (Search for MDMT in the group you will get past discussions on MDMT)

 

Just go thro the name plate or MDR of the vessel, you will get all these values

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Chandulal Vithlani
Sent: Monday, March 30, 2009 10:40 AM
To: materials-welding@googlegroups.com
Subject: [MW:1839] MWAP, Design Pressure, MDMT and Design Temperature

 

As per API 510, MAWP is defined as “The maximum gauge pressure permitted at the top of a pressure vessel in its operating position for a designated temperature. This pressure is based on calculations using the minimum (or average pitted) thickness for all critical vessel elements, (exclusive of thickness designated for corrosion) and adjusted for applicable static head pressure and non-pressure loads, e.g. wind, earthquake, etc.”.

 

What is the designated temperature?

 

How does MWAP differ from Design Pressure?

 

Similarly, MDMT has been defined in API 510 as “The lowest temperature at which a significant load can be applied to a pressure vessel as defined in the applicable construction code (e.g. ASME Code, Section VIII: Division I, Paragraph UG-20(b)).”

 

What is the difference between MDMT and Design Temperature?

 

 

Regards

 

Chandulal S Vithlani

 

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