Re: Double Block and Bleed Isolation

From: <abdul>
Date: Tue Dec 12 2006 - 04:50:00 EST

Dear Satria
The Double block and bleed (refered to as DBB) arrangement is achieved by provision of two isolation points (either two separate block valves or a single block valve having two seats, each of which makes a seal) with a tapping point located between them. The DBB arrangement is used for two applications:

1.       For energy isolation purpose.
2.       For preventing contamination purpose,

The DBB arrangement is used to achieve energy isolation from the live system for equipment & instruments maintenance. The DBB is one of the method to achieve initial valved isolation. Initial valved isolation is most often used to maintain containment while positive isolation is being made.

       Diffferent companies have different pactices for this purpose. e.g BP Pakistan uses RP 44-10 for DBB specification & arrangement. It defines requirement of DBB arrangement for energy isolation purpose at different pressure and temperature conditions.
i Regards,
A. Aziz Vayani
Sr. Facilities Design Engineer
Clough Engg & Integrated Solution
Karachi office, Pakistan

• Original Message ---- From: "Satria, Utama" <satria.utama@se1.bp.com> To: <a href="/group/PipingDesign/post?postID=LpECVVZ28FTkQDYq-92NSf32nVvwrc0dbEF1fAyiwEn9B2LQI6w1V-b0hjyVLjHdk54EAPUF6wR47lDSObvlmV6S">PipingDesign@yahoogroups.com</a> Sent: Tuesday, December 12, 2006 7:15:15 AM Subject: [PipingDesign] Double Block and Bleed Isolation

Dear Fellows ;

Any idea what Int'l Code or Regulation that covers requirement of double block and bleed isolation for equipment maintenance ? They preferably applicable Internationaly such API, ISO, OSHA, etc. But UKOOA,BS, EN, NORSOK also considerable.

Appreciate if you can return to me a.s.a.p.

Best Regards,

Satria Utama Relianto
Mechanical Engineer
Integrity Management
Engineering Support
BP Indonesia Business Unit
< email : satriau@bp.com > Telp. + 62 ( 21 ) 78548451
Fax. + 62 ( 21 ) 78549062

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Received on Tue Dec 12 04:50:00 2006