Tuesday, December 16, 2008

Branch components.


Firstly, I would like to highlight the word latrolet, weldolet are proprietary names of BF. However it has become synonym in the industry to use those names which is not correct. It is also referred as branch-olets prefixed by 45 deg, 90 deg, etc. not to confuse with proprietary name. Even the ANSI codes do not refer BF names.

Coming to the question, no doubt it is a seamless pipe made reinforced branch fittings. The beveling also looks fine for the profile of the pipe. Being a non standard size, the dimensions have to be verified  with the manufacturer only. But if you ask if forging or pipe made item is acceptable, the answer would be...both can be accepted as the subject is the reinforcing area and cross section thickness.

Additionally, the general opinion is that the BW Reinf.branch fittings has to be used within the available STD, XS, XXS, 160 is not correct. Though being standardized by manufacturer's, we can prescribe actual thickness requirement within B36.10/19 and to std plate thickness. As per my verification all the manufacturer's facility has the flexibility to manufacture the same.
For eg. MEGA a reputed manufacturer in Bergamo, near Milano, Italy is on such vendor. I would say apart from BF, they are the best company with the know-how of  reinforced branch fittings and any other forged components. Their catalog gives a detailed dimension of all types of Rienf. branch fittings for all thickness and diameters of B16.10/19, including the 32".

http://www.mega-spa.com/index.php?option=com_content&task=view&id=28&Itemid=43

Moreover some forging manufacturers like MAWO fittings in Germany do make special designed branch components which are not really looking like a 'olet nor a coupling and not always forged. Such components have been tested and proved at site and has less material and flexibility in mass manufacturing and of course cheaper than the so called weldolets or sockolets or flangolets etc. And the good part is the B31.3 code do not pose any restriction in such configurations. Pl. take note these components are proprietary of their customers such as BASF, Linde for example.

So I would suggest to use the freedom of the code to invent and design your own new, cheap and economical and ease in welding with reduced fabrication and testing costs by avoiding the cumbersome welding process involved in the BW branch fitting. The best would be as Raghu suggested, the RF pads, but that also has its disadvantages in the operation life span.

Regards,
Kannan.

On Fri, Dec 12, 2008 at 11:19 AM, Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com> wrote:
Can any one pl. share their experience on large size latrolets? I have not seen latrolet like this shape before, it looks like the vendor has taken a higher thickness pipe and machined to suite the curvature on run pipe. It s 32" x 28" latrolet weighing almost 670 Kg. in absence of catalogue for this size or any dimensional standard really it's impractical to judge whether it is a correct type fitting or not?

Friday, December 12, 2008

KAMOS RTJ Gaskets


I have not used this gasket but heard of this from one of the vendors. To what I understand from him and later discussing after your email, it seems it does reduce the time as you mentioned due to the difference in the method of testing. And as per the vendor this gasket does not have any disadvantage compared with the conventional ones from the operation experience point of view. But the concept is not new as other companies like kroll and Zieller are attempting on such variations.

Another special design gasket is available and being used by some companies like BASF and Statoil. The company is Jungtec, probably a more unfaimliar company. But they have good ideas and working design concepts and good long experience in field, on gaskets. On the subject of leakage after maintenance Jungtec is quit good.
Thier site is http://www.jungtec.de/en/productsoverview.html

For our friends to know more about the subject gasket... http://www.karmsund.no/2.1_kamos_rtj.htm

With regards,
Kannan.



Mohamed Ibrahim <mibrahim_ak@yahoo.com>
Sent by: piping_valves@yahoogroups.com

20/11/2008 15:13

Please respond to
piping_valves@yahoogroups.com

To
piping_valves@yahoogroups.com
cc
kannan.sundaram@linde-le.com
Subject
[piping_valves] KAMOS RTJ Gaskets





Dear Friends,

 
Can you anyone please advise as you have ever used KAMOS RTJ Gaskets in your project as our client TOTAL asked us to see the feasibility to use such Gaskets in our Pipeline Project. Normally these gaskets will allow us to skip the standard leak test,cost reduction and can reduce down-time connected with testing.
 
Best Regards,
 
Ibrahim.

Design standard for ball valve


Dear Nitin,

Unofurtunately I was on leave and took sometime clearing all my personal emails. However it is disappointing our dear members have become more reluctant and lethargic to have discussions mutually benificial.

Coming to the query, to my knowledge of American standards, this size and rating is not covered for the obvious reason being unusual and are yet to be standardised. The solution in your case is to indicate the design to be in acc. with API 6D and F/F to manuf. std. I also have doubt if any manuf. will make a RB valve in that size. So you may have to consider only FB type. For testing of such valves ensure you mix API598 and API 6D to suit the design and service condition as many suppliers practically are unable to meet API 6D creteria for such large size. This is from my inspection experience.

If alternate valve type can be thought about in your application, definitely you should take that change. The key reasons being the maintenance of seats, back flushing, stem packing overhauling is going to be more complicated than any other on/off valve or even a flow control valve. Last but not the least, cost varies in the region of 25 to 40% more. for valves above 32".

So use of ball valves above 28" should have the right reasons.

Regards,
Kannan.



"Hanamapure Nitin \(Mumbai - Piping\)" <N.Hanamapure@ticb.com>
Sent by: piping_valves@yahoogroups.com

07/11/2008 06:55

To
<piping_valves@yahoogroups.com>
cc
Subject
[piping_valves] Design standard for ball valve





Dear all,

I am looking for design standard for 600#, 42” LTCS reduced bore ball valve used in sour service.

Could anyone suggest me the design standard?

Thank you.

Best regards,

Nitin Hanamapure_._,___

Monday, December 8, 2008

AISI 307 reference.


Dear friends,

Atlast after pushing the sales manager and contacting the design manager directly, I found that the AISI 307 was wrongly indicated in their drawings and that it is a welding wire used for dissimilar welding to be designated as 'AVESTA 307-si'. It is being adapted by these manufacturers for cutting cost on the price of such valves in overall, by a welding overlay on the valve body itself. And having good hardness of 220 BHN and with the usual trim of 13Cr/316/304 the seating/disc hardness difference is taken care of. Incase of maintenance the welding is lapped onsite. No seat rings, threading, seal welding of the rings needed...looks a good idea and it does depend on the type and constructional design aspect of the valve and the fluid system.

The link provide by the Design manager of one of the valve company.

http://www.avestawelding.com/2813.epibrw

Also I found that the AWS designates as 'A 5.2 E 307' of the solid wire type with slight difference in the composition as per AJ Marshall's manganese steel welding info. And another one called 'super 307 / AWS E307-16' from SuperTech, Germany. Looks a lot of variations are available under 307.

The subject valves involved in my case was conventional check valves & NS check valves.

With regards,
Kannan Sundaram.


   
Dear members,

I would like to know more about AISI 307 which is being used by certain
suppliers as a seating of valves. The suppliers are not able to give the
exact ASTM references, but they say it is ...more or less....equivalent to
X15CrNiMn188(1.4370) of DIN. However I found this DIN material being used
generally to make check valve pins. I am having doubt if it is a
precipitation hardened steel category(which is usually prescribed for
stem/disc/ball/blade/diffuser materials requiring high strength) or a
something related to welding rods.

From my search it looks more of a welding overlay material. However I
could not find any ASTM specification reference of it. Can somebody
specify the same for me to check out the details.

With regards,
Kannan Sundaram.

Tuesday, December 2, 2008

Valve Datasheet templates

Dear members, sorry to forward this email quit late as I was on vacation.
 
This link looks quit informative.

----- Forwarded Message ----
From: Goran <goran_maaspers@hotmail.com>
To: kannan_cit@yahoo.com; ahmedeissa16@yahoo.com
Sent: Friday, November 21, 2008 6:43:42 PM
Subject: Valve Datasheet templates

Hi guys,
 
I stumbled across your correspondence at piping-valves.blogspot.com regarding Valve Datasheet templates.
 
This link may come handy: http://www.standard.no/acrobat/L-001/VDS/index.htm. These data sheets are used as is or customized to specific requirement by the norwegians. Use with sound engineering practice.
 
 
Best regards,
Goran Maspers
Sweden

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