What is MAWP? Difference between MAWP , Design Pressure and Operating Pressure

learn the Difference between MAWP, Design Pressure ,Operating Pressure & Hydrotest Pressure these four confusing equipment pressure terms.

1. MAWP +Design Pressure +Operating Pressure Varun Patel, B.E- Mechanical, PMP ® 1

2. Operating Pressure Pressure at which your equipment is going to operate during the life of the equipment This is the reference pressure to prepare DATA Sheet of the equipment 2

3. Design Pressure Operating pressure + any normal excess pressure that can occur during the equipment's operation Usually in the range of 10% to as high as 25% depends of safety consideration of designer 3

4. MAWP (Maximum Allowable Working Pressure) Considering various fabrication parameters and design code requirement equipment manufacturer calculate thickness of the plate to manufactured equipment If he come with some odd thickness plate which is not commercially available he will go for commercially available higher thickness plate Back calculate pressure with selected plat thickness that equipment can withstand that is MAWP 4

5. Hydro test Pressure This pressure is calculated based on the equation given in equipment design and manufacturing code 130% of design pressure if design code is ASME Section VIII Div-1 If you go for pneumatic test in place of hydro test, the test pressure is 110% of design pressure 5

6. Different Types of Pressure for Equipment 6 Hydro test Pressure 130% of Design Pressure (ASME Section VIII) MAWP (Maximum Allowable Working Pressure) Minimum or more than 100% of Design Pressure Design Pressure 100 Operating Pressure 90% of Design Pressure

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