Pressure Vessel Nozzle - Set In or Set On Type

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Mechie Active Contributor Join Date: Dec 2008 Posts: 24	Pressure Vessel Nozzle - Set In or Set On Type 07/12/2009 12:01 PM
	Dear Friends, I would like to know in what circumstances we are going to use Set On nozzles? Normally we use Set In nozzles, but in our client's spec. for nozzle thickness 50 mm to 100mm we can use set on (abutting to Vessel shell OD) type of nozzles. (nozzle is not extended up to ID of shell) Can anybody guide me under which circumstances we have to use these type of nozzles and what is the significance for the same?
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phoenix911 Guru Join Date: Aug 2007 Posts: 23647 Good Answers: 420	#1 Re: Pressure Vessel Nozzle - Set In or Set On Type 07/12/2009 1:44 PM
	one word......manufacturibility. phoenix911 __________________ “ When people get what they want, they are often surprised when they get what they deserve " - James Wood
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Anonymous Poster	#2 Re: Pressure Vessel Nozzle - Set In or Set On Type 07/13/2009 6:41 AM
	Normally set-on nozzle are used when: Nozzle thk. <shell thk. When welding from inside is not possible.
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YesMAM Power-User Join Date: Jun 2009 Location: Land o' Lincoln Posts: 124 Good Answers: 7	#3 Re: Pressure Vessel Nozzle - Set In or Set On Type 07/13/2009 11:02 AM
	Mechie, I believe the key word here is "... client's spec. for nozzle thickness 50 mm to 100 mm we can use set on ...". Your choice. ASME code will spell out the welding necessary and NDT required if "set on" nozzles are used, as well as pressure/temperature limits for such nozzles. In general, you will have to bevel the nozzle wall to provide full penetration welding if possible. __________________ If you can't do it right the first time ... do it wrong, then let the professionals fix it.
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Anonymous Poster (1); phoenix911 (1); YesMAM (1)

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