rectangular nozzle

[almaghrebi]

Hi,
Any idea how to design( beside FEA) a rectangular nozzle on cylindrical pressure vessel?

Thank you

[Ali366]

Hi Almaghrebi,

Could you please clarify your question a little bit more?
- Are you designing a pressure vessel or a storage tank? And what is the design code?
- Are you doing a thorough detail design or just estimating for a quotation or something like that?
- Do you need to know how to design the rectangular nozzle neck, or how to sufficiently reinforce the rectangular opening in the cylindrical shell?
- Are there any anticipated external nozzle loads or the only design parameters are internal (or hydrostatic) pressure and design temperature?

[almaghrebi]

Hello Ali366,

Thank you for the reply.

It's a pressure vessel following ASME SECT. VIII DIV 1 and I'm doing a thorough detail.
I want to know how to sufficiently reinforce the rectangular opening in the cylindrical shell? There are no external loads.

Thanks

[Ali366]

Hi Almaghrebi,

Sorry for late reply. I did not have access to this site for the last few days.
Since you are doing a detail design, best suggestion (and maybe the only solution) for ensuring about sufficiency of opening reinforcement can be FEA as you said in your first post. I haven't seen any special rules (design by rule) for a rectangular opening, probably it is due to the geometry of such openings.
For a rectangular nozzle neck, as a reasonably accurate design method (other than FEA) I would suggest you to take a look at Roark's formulas for stress and strain. Formulas for rectangular plates with two edges fixed and two edges simply supported (or even 4 edges fixed) under uniform pressure is a good solution.

Regards,

[simplefire]

whatever kind of geometry of the nozzle is...make sure that the available area is greater than the required area. consult the b31.3 for a better phisical idea on reinforcement....then design ur reinforcement.....double check ur loads with wrc 107

[saplanti]

Here is the discussion on the rectangular openings on the Eng-Tips website:

[link Point to another website Only the registered members can access]
Hope it helps

[A.Venugopal]

My dear friend,

Owing to the disruption in this site availability , I could not help you, but see wehether this belated suggestion helps you. Please look in to Mandatory appendix 13 of the code, consider your nozzle as a shell and check for membranestresses and bending stresses. Reinforcing requirement on vessels for rectangular nozzles the compensation is tobe calculated the same way as you calculate for the circular nozzles.

Hope this helps.

Best regards

Venugopal

[mbc.engg]

Good reply by Venugopal.