Mechanical Engineering, Pressure Vessel, Heat Exchanger, Risk Management, COMPRESS, Division 2, External Pressure randy bogard Mechanical Engineering, Pressure Vessel, Heat Exchanger, Risk Management, COMPRESS, Division 2, External Pressure randy bogard

Save $ Using Division 2 External Pressure Rules

Can you save money using ASME Division 2 rules instead of Division 1? 

There are many ways to take advantage of the higher allowables and more accurate numerical methods in Division 2. 

Take a look at this simple external pressure (vacuum) case:

Outside Diameter, Do = 60.75” (1543 mm)

Thickness, t = 0.375” (9.53 mm)

Unsupported Length, L = 264” (6706 mm)

The Division 1 vessel does not pass the vacuum condition of 14.7 psi (101 kPa).

The Division 2 vessel passes the vacuum condition of 14.7 psi (101 kPa).

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Mechanical Engineering, Pressure Vessel, Heat Exchanger, Risk Management, COMPRESS, Floating Tubesheet, External Pressure randy bogard Mechanical Engineering, Pressure Vessel, Heat Exchanger, Risk Management, COMPRESS, Floating Tubesheet, External Pressure randy bogard

Missing Floating Tubesheet Calculations

Does your floating tubesheet heat exchanger have complete calculations? 

I have been asked many times to check calculations for floating tubesheet heat exchangers only to find some of them missing. The calculation I see most often omitted is from the shell side pressure acting on the internal floating tubesheet components. The external pressure from the shell side often governs over the internal pressure from the tube side so checking this case is critical. 

Many Owner/Operators will accept equipment for service without these calculations performed. Please double-check this case in your floating tubesheet heat exchangers.

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