Are Nozzle loads considered in Shell & Tube Heat Exchanger Saddle support design

[DK44]

Dears.

Are Nozzle loads to be considered in the design of Saddle Supports for Shell and Tube Heat Exchangers. If so what is the method.

 

[MJCronin]

Yes, they are typically considered..... however a timing problem always exists !

The HX customer's Piping nozzle loads are rarely available at the time of HX saddle design, so some kind of reasonable default load must be used.

Nozzle loads from customer's piping are considered indirectly in the design of the saddle supports by the HX vendors.

S&THX Vendors place limits on the reactions imposed by the customer's piping system. These are typically noted on the HX outline drawings

These limits are developed based on the individual HX design that meets all of the other client's requirements

https://medwinpublishers.com/PPEJ/PPEJ16000151.pdf

MJCronin
Sr. Process Engineer

 

[TGS4]

Indeed they need to be considered. Draw yourself a free body diagram of your vessel. Your answer is there.

 

[r6155]

See
1) TEMA 9th SECTION 10 Recomended Good Practice.
-Zick modification for heat exchanger.
-Nozzle loading

2) API 660-A1 9th published 08/06/2020

Table 2—Nozzle Allowable Forces and Moments at the Nozzle Neck to Shell/Channel Interface

3) IOPG –International Association of Oil & Gas Producers
SPECIFICATION S-614 DECEMBER 2018
Supplementary Specification to API Standard 660 Shell-and-Tube Heat Exchangers

Regards

 

[KevinNZ]

Our projects have large pipe attached to the vessels, say DN1200 pipe attached 4m dia vessel. We model the vessel in the pipe stress model so we get the a complete picture of the loads on the vessel including the effect of the piping on the vessel supports.

While we may go to tender for the vessels with a hold on the nozzle and support loads, we do not let the detailed design be completed without the loads form the piping model.

 

[r6155]

@ KevinNZ
This is a business problem. As a manufacturer, I include in the offer the time required to receive the buyer's information.

Regards

 

[DK44]

Thank you all.
Does PV Elite include the Nozzle loads also into the saddle calculations.

 

[XL83NL]

Thank you all.
Does PV Elite include the Nozzle loads also into the saddle calculations.

Best is you check with Hexagon yourself; in the you need to assure the program does what you hope it does, or needs to do.
As to your question, this came up in the recent PVElite QA Session after their webinar for PVE v23;

Presentation slides / Q&A



Huub
- You never get what you expect, you only get what you inspect.

 

[DK44]

Dear All,
Thank you for providing your remarks and references.
1. According to my understanding (please correct me if I am wrong) :
1.1. Various standards and Job specifications provide Nozzle loads(forces and Moments) values.
1.2. WRC and accordingly PV Elite, provides analysis of Stresses in Nozzle / Shell / Head / RF Pad at the Jn and Rf Pad attachments due to Nozzle loads.
1.3. However, guide lines as to how to consider the Nozzle loads on the Bracket / Saddles of Vessels / Heat Exchanges do not seem to be available.
1.4. PV Elite also does not address the Nozzle loads input and usage in saddle design in the calculations.

2. In these circumstances, I am desirous to know, how to consider the Nozzle loads in the calculations of Brackets / saddles for Vessels & Heat Exchangers. An example calculation of Saddle considering such loads will be of great reference.

3. A free body diagram as per TGS4 will be also helpful in understanding.

Excuse me if I have repeated my question, but for to have better understanding.