plz give me info

From: <pradeeep>
Date: Tue Dec 09 2003 - 00:21:00 EST

can enybody tell me about offshore piping and removing oil from well

---

Discussion List sponsor: The fluid flow calculations website - www.LMNOeng.com - LMNO Engineering, Research, and Software, Ltd.

---

To leave this list, send a blank email to: PipingDesign-unsubscribe@yahoogroups.com

---

List home: http://www.pipingdesign.com

---

There are 2 messages in this issue.

Topics in this digest:

1. RE: stress corrosion cracking From: "Steve McKenzie"
2. Re: stress corrosion cracking From: Narendra Roy

   ---

---

Message: 1
Date: Mon, 8 Dec 2003 11:05:08 +1300
From: "Steve McKenzie"
Subject: RE: stress corrosion cracking

Hi LAKSHMI NARAYANA

havent had this problem. The following link and the bibliography within may be of some help to you.

http://www.ncedaust.org/peter3.htm

The passivation by water addition sounds interesting.

Cheers

Steve McKenzie

-----Original Message-----
From: Lakshmi V. Narayana [mailto:LNarayana@safco.net] Sent: Sunday, December 07, 2003 11:34 PM To: 'PipingDesign@yahoogroups.com'
Subject: [PipingDesign] stress corrosion cracking

Dear friends,

We are facing SCC problem since long time. The service is anhydrous liquid ammonia and material of construction is LTCS. We observed leaks in weldments due to SCC as Liquid NH3 is contaminated with CO2. SS material can be replaced.however cost will be more. Can SCC be mitigated by doing stress relieving of all joints. What about small bore lines. My suggestion is to replace all small bore line SS304L and all bog bore lines shall be stress relieved. Can any body share his experience in this regard.

Regards
LAKSHMI NARAYANA
MECHANICAL ENGINEER(FERTILIZERS)

---

Discussion List sponsor: The fluid flow calculations website - www.LMNOeng.com - LMNO Engineering, Research, and Software, Ltd.

---

Information presented on this list is given as helpful advice, nonsense, carefully-considered calulation or any combination of the above. The intent is to spark discussion and encourage knowledge-sharing amongst professionals. If you blow yourself up by doing stuff remotely described by info gleaned from reading this list, you are an idiot.

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

---

---

Message: 2
Date: Sun, 7 Dec 2003 18:23:09 -0800 (PST) From: Narendra Roy
Subject: Re: stress corrosion cracking

Dear Lakshmi V Narayana
CSLT is the most popular selection. Yes anhydrous ammonia cause SCC in Carbon steels, but the precautions like inhibition using distilled water added upto 0.2 % makes CS SCC resistant to Ammonia service. Another precaution is to reduce the residual stress by PWHT of welds and the cold formed components of the handling system. Slight over design (reduced component stress) may give you relief from stress cracking.
Hope it solves the problem faced by you. Narendra K Roy
Gramya Research

• "Lakshmi V. Narayana" wrote:
  > Dear friends,
  >
  > We are facing SCC problem since long time. The
  > service is anhydrous liquid
  > ammonia and material of construction is LTCS. We
  > observed leaks in weldments
  > due to SCC as Liquid NH3 is contaminated with CO2.
  > SS material can be
  > replaced.however cost will be more. Can SCC be
  > mitigated by doing stress
  > relieving of all joints. What about small bore
  > lines. My suggestion is to
  > replace all small bore line SS304L and all bog bore
  > lines shall be stress
  > relieved. Can any body share his experience in this
  > regard.
  >
  > Regards
  > LAKSHMI NARAYANA
  > MECHANICAL ENGINEER(FERTILIZERS)
  > > >
  > ------------------------ Yahoo! Groups Sponsor
  >
  > ========================================
  > Discussion List sponsor: The fluid flow calculations
  > website - www.LMNOeng.com - LMNO Engineering,
  > Research, and Software, Ltd.
  > =======================================
  > Information presented on this list is given as
  > helpful advice, nonsense, carefully-considered
  > calulation or any combination of the above. The
  > intent is to spark discussion and encourage
  > knowledge-sharing amongst professionals. If you blow
  > yourself up by doing stuff remotely described by
  > info gleaned from reading this list, you are an
  > idiot.
  >
  > Your use of Yahoo! Groups is subject to
  > http://docs.yahoo.com/info/terms/
  > >

  ---

Do you Yahoo!?
New Yahoo! Photos - easier uploading and sharing. http://photos.yahoo.com/

---

---

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

---

Do you Yahoo!?
New Yahoo! Photos - easier uploading and sharing

[Non-text portions of this message have been removed] Received on Tue Dec 09 00:21:00 2003