Annular bottom plates from API-650 Tanks

[saqib gul]

Can any body help me out that in which cases we use annular bottom plates for above ground storage tanks? Are there any recommendations in API-650 regarding the use of annular plates? Are the use of annular plates depends on the size of tanks? I am particularly talking about A-283 Gr.C Plates.

 

Regards

Saqib Gul

Design Engineer

Attock Refinery Limited

Pakistan

[Owen Jenkins]

Gentlemen,

A word to the wise... You could find yourselves in a lot of trouble for copyright infringement, not only with the API but also Google.

As you are well aware, copyright exists in ALL API material: I advise you NEVER to post illegal copies of copyright material in a public chat room. I realise it was done with the best of intentions to help a colleague in need, but please find another way of communicating the information.

 

I'm posting this advice to help you and others stay out of trouble. We have no idea who is monitoring internet traffic! Unfortunately, today Big Brother undoubtedly IS watching us.

 

I'm in Scotland! These emails are read all around the world.

 

Regards to all,

Owen Jenkins.

 

 

 

----- Original Message -----

From: Kannan....@Linde-LE.com

To: material...@googlegroups.com

Sent: Thursday, February 21, 2008 8:58 AM

Subject: [MW:586] Re: Annular bottom plates from API-650 Tanks

I think you are missing the copy of API 650......!

A283 Gr.C comes under group I and the following part of API 650 is self explainatory.

5.5 ANNULAR BOTTOM PLATES
5.5.1 When the bottom shell course is designed using the allowable stress for materials in Group IV, IVA, V, or VI, butt-welded
annular bottom plates shall be used (see 5.1.5.6). When the bottom shell course is of a material in Group IV, IVA, V, or VI and the
maximum product stress (see 5.6.2.1) for the first shell course is less than or equal to 160 MPa (23,200 lbf/in.2) or the maximum
hydrostatic test stress (see 5.6.2.2) for the first shell course is less than or equal to 172 MPa (24,900 lbf/in.2), lap-welded bottom
plates (see 5.1.5.4) may be used in lieu of butt-welded annular bottom plates.

M.4.1 Tanks with diameters exceeding 30 m (100 ft) shall have butt-welded annular bottom plates (see 5.1.5.6).

5.1.5.6 Bottom Annular-Plate Joints
Bottom annular-plate radial joints shall be butt-welded in accordance with 5.1.5.5 and shall have complete penetration and complete
fusion. The backing strip, if used, shall be compatible for welding the annular plates together.

5.1.5.5 Butt-Welded Bottom Joints
Butt-welded bottom plates shall have their parallel edges prepared for butt welding with either square or V grooves. Butt-welds shall
be made using an appropriate weld joint configuration that yields a complete penetration weld. Typical permissible bottom buttwelds
without a backing strip are the same as those shown in Figure 5-1. The use of a backing strip at least 3 mm (1/8 in.) thick tack
welded to the underside of the plate is permitted. Butt-welds using a backing strip are shown in Figure 5-3A. If square grooves are
employed, the root openings shall not be less than 6 mm (1/4 in.). A metal spacer shall be used to maintain the root opening between
the adjoining plate edges unless the Manufacturer submits another method of butt-welding the bottom for the Purchaser's approval.
Three-plate joints in the tank bottom shall be at least 300 mm (12 in.) from each other and from the tank shell.



With regards,
Kannan Sundaram.

"saqib gul" <saqi...@gmail.com> Sent by: material...@googlegroups.com 21/02/2008 07:49 Please respond to material...@googlegroups.com

To material...@googlegroups.com cc Subject [MW:585] Annular bottom plates from API-650 Tanks

[Kannan....@linde-le.com]

Dear Friends,

A non- member has posted this message. I am sorry on posting a part para of the API code for better understanding.

I think and suggest to this group, as does yahoogroups, it would be better to avoid even attachments.

I request all others to follow suit and take this seriously as I have now.

Again sorry to all members and moderators for causing to be noticed by someone somewhere.

With regards,
Kannan Sundaram.

"Owen Jenkins" <ow...@osjl.co.uk> Sent by: material...@googlegroups.com 21/02/2008 10:45 Please respond to material...@googlegroups.com

To <material...@googlegroups.com> cc Subject [MW:587] Re: Annular bottom plates from API-650 Tanks

[shailesh dave]

Dear Mr. Kannan,

 

I don't think there is any problem in sending the attachment all across as we are doing with our company and to other companies. Since these are soft copies of the docs. which we are circulating we are not breaching the laws of copy rights in any case. These attachments are circulated for sharing the knowledge and not for destructive activities.

 

Regards,

 

S.N.Dave

Kannan....@Linde-LE.com wrote:

---

Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now.

[Kannan....@linde-le.com]

The wordings of the copyright law says that we cannot distribute or share or copy the code in any form including the soft copies, even fully or partly.

As you know it is prevented with this restriction, as it is an intelectual property of the respective institutions. And not the least you must already be knowing
the cost of each standard or code. Without that income Institutions cannot do any research and collect various industrial experiences to form such collective codes.

It is also not allowed to put the soft copy even in a common directory in the server for all the employees to access, view and read, if the company has not purchased the code with distribution licence within the organisation.

So take care, else the ISO certification can be pulled off, if your company has one and a possible lawsuit from the Institution.

This is all true even though we interpret and apply the codes for the general benefit of the humanity as Engineers which is the irony of the Copyright rules.

With regards,
Kannan Sundaram.

shailesh dave <snd...@yahoo.com> Sent by: material...@googlegroups.com 21/02/2008 11:34 Please respond to material...@googlegroups.com

To material...@googlegroups.com cc Subject [MW:589] Re: Annular bottom plates from API-650 Tanks

[Owen Jenkins]

Dear All,

My advice stands. What you might choose to do within your own company is one thing - I'm sure your company lawyers can help you on matters of copyright. What you post to a world-wide, public group is another. For your information, I am a registered member of this group. If the originators of the group intended it to be a private, internal group, they shouldn't have done it through Google - it's the gateway to the entire world!

 

I think that this is a very useful forum and a splendid way to share advice and information - just please be careful about copyright issues. The API in particular seems to be very hot on them. If you buy a digital (PDF) version of their specs now, single-user versions are literally that - you'll only be able to install it on one machine and you can only print it once. Which is great if your printer runs out of ink half-way through. I've gone back to buying paper copies.

 

I do consulting work on various oilfield problems and I teach materials, corrosion and welding matters to M.Sc. students at the Robert Gordon University in Aberdeen, where they are VERY sensitive about copyright issues.

 

Regards to all and keep up the good work!

[Tirumala B N Tagore]

Dear All,
It is better to share our opinions, experiances without transmitting  international standrds , codes and  avoid the copy rights related problems. We can quote the refrence clause of  specific  code or standard and  our understanding , way of  using it etc.,  while communicating with in the group.
Regards,
Tagore

[pjo...@technip.com]

Dear all,

Let's take the advice of Owen more seriously. In the past, too, it has been
discouraged to attach any copyright material for correspondance on this
forum. And now, let's make it a practice to avoid even reproduction of the
Standards/Codes (international or organisation-specific internal ones).

As oneof the moderators of this forum, I thank Owen for his proactive
suggestion on this issue. Also, Kannan has clarified to this mail with some
more input for benefit of the group-members.

Best regards,

Prasad Joshi
e-mail: pjo...@technip.com
Phone: +971-(0)2-611-6643

"Owen Jenkins"
<ow...@osjl.co.uk>
Sent by: To
materials-welding <material...@googlegroups.com
@googlegroups.com >
cc

21/02/08 03:16 PM Subject
[MW:591] Re: Copyright issues

Please respond to
materials-welding
@googlegroups.com

Owen Jenkins.

Dear Mr. Kannan,

Regards,

S.N.Dave

Kannan....@Linde-LE.com wrote:

Dear Friends,

With regards,
Kannan Sundaram.

Save a tree...please don't print this e-mail unless you really need to.

Save a tree...please don't print this e-mail unless you really need to.