31 replies to this topic

[fallah]

JoeWong:

It is included in own API 521 5th Edition,not in its Addendum.

[CMA010]

fallah:


But is is included in the API STD 521 5th Edition, Jan 2007 Addendum May 2008 which is published as a single document where joe is referring to.

[Qalander (Chem)]

fallah:

Dear,

You and Joe both may be right in a way that probably the mode of access onto API site could be varying i.e. as a member or free subscriber.

As a free subscriber access could be somewhat restricted as I found early on.


Hope this helps in clarifying the issue& slightly prolonged discussion here above.

[fallah]

Qalander:

Contrary to your thinking, there is no problem regarding the access to standard and,...., therefore discussion to be done for better clarification...

[Qalander (Chem)]

fallah:

OK,

Dear fallah Thanks (I withdraw from my envisaged scenario as you clarify). Whereas I do appreciate your update & still wait for Joe's response;if any!

So that I and other forum colleagues get better/ more accurate awareness on the issue.

[PinoyCan]

Hi Guys,

I am checking if a thermal relief valve is required on the cold side of a new exchanger in case of the blocked-in condition. Isolating block valves are to be installed on the inlet & outlet lines of the cold stream to/from the exchmage. The following are the operating conditions:

Hot Side:

Fluid: Inhibited Water
Inlet Temperature: 85 C
Outlet Temperature: 33 C
Inlet Pressure: 370 Kpag
Design Pressure: 1,380 Kpag

Cold Side:

Fluid:Recycle Water
Inlet Temperature: 22 C
Outlet Temperature: 79 C
Inlet Pressure: 720 KPag
Design Pressure: 1,448 KPag

The design pressures are based on the maximum shut-off pressure of the pumps.

My analysis is that, a thermal relief valve is not necessary because, for the cold-side pressure to reach the design pressure of 1,448 KPag during blocked-in condition, the Recycle Water must attain a temperature of 200 C. Since the Inhibited Water temperature (heating medium) is only 85 C, it is not possible for the Recycle Water to have a temperature of 200 C.

Is my analysis proper? Please comment.

Thanks.

[Art Montemayor]

Pinoycan:

This is an old thread that you are skyjacking. Rather than extend this thread longer than 2 pages, please cut and paste your query into a NEW THREAD on this Forum. Otherwise, this thread get confused and members find it difficult to determine who is answering what and to whom.

I will delete this post after a couple of days, giving you time to start your own new thread.