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TOPIC: Fixed & sliding Saddle

Re: Fixed & sliding Saddle 6 years 8 months ago #6738

  • 11echo
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Piping coming from any where that is connected to the exchanger does not dictate the anchored end! Flexibility can be designed into the piping to accommodate the any movement from any location. Granted this can make make things complicated when a better routing could just as easily make it simple. But to find the anchored end of these exchangers all you need to look at is the vendor drawings for these exchangers, they'll indicate which end is to be anchored and which is to be sliding. OR just look at the exchanger, the sliding end will have slots for bolt holes and the anchored end will have the normal bolt holes. Once the anchored end is know the next big issue is equipment positioning for maintenance access (especially if these are shell & tube exchangers).

Re: Fixed & sliding Saddle 6 years 8 months ago #6739

  • Er.piping
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Dear 11echo, i partially agree with some of the points you have mentioned in your post

But i dont agree where you said that a piping designer has to refer vendor drawing
for deciding fixed saddle location, agreed that vendor do marks fixed sliding saddle
on drawing but that is tentative and it can be reversed because..

1. vendor do not necessarily have idea about piping configuration around exchanger.
So on what basis vendor will decide the location of fixed /sliding saddle.
2. Equipment layout is finalized before receiving the final vendor drawing,
including provision for maintenance like tube bundle removal,crane access etc.

So i dont know if it is possible to make provision for maintenance at such late stage,as you have
mentioned.

I remember we have commented many times on exchanger vendor drawing to interchange the fixed and sliding
saddle lovation based on criteria i have stated in my earliar post.

Please refer below link for your reference. Go to point no. 7 (piping) .

http://www.red-bag.com/jcms/design-guid ... tml#piping

Re: Fixed & sliding Saddle 6 years 8 months ago #6740

  • 11echo
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Vendors don’t have to agree with your piping because they don’t care! They offer a piece of equipment built under the NORMAL practice of having an anchored end at the head (because most of the connections are there) and a sliding end there thermo expansion is directed! …Those are the facts of life! “IF” you do not care to heed these facts your piping system WILL meet trouble, the same way it will if you don’t allow enough access and/or room to pull the tube bundles from these exchanges. I grantee it will come back on you and/or your company in a negative way! …Again my $0.02 ..."learn it or lose it, your choice".

Re: Fixed & sliding Saddle 6 years 5 months ago #6784

  • AbhijitN
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Important things to highlight-

1) Vendor cannot decide on his own for the location of fixed point & sliding point on the S&T Exchanger as he would not be aware the layout situations at all unless we tell him.
2) If the vendor decides as a client we have a right to change it depending on the layout configuration & vendor has to comply with the same or else he will not meet the client expectation & loose relationship with business from his client like Shell, Exxon etc.
3) The statements made above by Jop, Er. Piping, Srivallabha are the normal practice how we deal with this all the time.

Hope it helped.

Re: Fixed & sliding Saddle 6 years 5 months ago #6785

  • 11echo
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http://www.pveng.com/Sample/HeatExchang ... hanger.php
Bottom of the page there are 3 links, first one is “H&C Heat Transfer Report” open it and go to page 5, you will see a detail of a S&T exchanger, note that side the anchored end is on.
Link two “SolidWorks Drawing” open it and go to page 6, again note where the anchored end is located (may have to review the first page also)

This is how S&T exchangers are built (notice where the anchored end is)! They are purchased for the project and place to accomplish the process, then piping is routed to this equipment to facilitate operation and maintenance!
WHEN has anybody here ever routed piping to a location to service an exchanger and THEN try to design an exchanger to fit the location!??

Re: Fixed & sliding Saddle 6 years 5 months ago #6786

  • Jop
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Mark,
I have read your latest contribution on this subject. I also looked at the links you included. Good find!
I have the following comments:

(1) Regardless of what is shown on these drawings I worked on many, many projects and I remember that we had (or took) the option to select which saddle we wanted to be anchored. The Exchanger Fabricator never forbid us to choose or switch anchor locations. It was a standard item to look at, consider and select when we did the Vendor Drawing Squad Check.

(2) Pull up pipingdesigners.com/Tools%20-%20section%205.htm, click on the "S & T" tab at the bottom of the screen. This document was created and used at Fluor for ISO 9001 level control of Equipment Squad Check. On the left side of the screen scan down to line 41, 42 & 43. These are the issues related to the subject of anchor location.

(3) We also looked at the location of the "Name Plate" (line 49) and made sure it did not end up on the side that was between two side-by-side exchangers (or Stacked Pairs).

(4) I could not tell by the drawings (in your links) but they may be final approved drawings reflecting what may be the end result of the anchor selection process. Not knowing anything about the Project these two examples are a part it is difficult to define why the anchor saddle is located at the Channel end. However I can think of a two of possibilities.
Do it once and Do it Right
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