Steam Drum and Sec. VIII
Steam Drum and Sec. VIII
(OP)
How can a Steam Drum, which is part of a Fired Steam Boiler, be designed under Sec. VIII?
I appreciate any advise.
I appreciate any advise.
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Steam Drum and Sec. VIII
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Steam Drum and Sec. VIIISteam Drum and Sec. VIII(OP)
How can a Steam Drum, which is part of a Fired Steam Boiler, be designed under Sec. VIII?
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RE: Steam Drum and Sec. VIII
RE: Steam Drum and Sec. VIII
RE: Steam Drum and Sec. VIII
RE: Steam Drum and Sec. VIII
Isthill:
Would you let me know which Code Case you mean?
Davefita:
If we have intervening valves on interconnecting piping between steam drum and boiler, do we need to consider the drum as a part of boiler?
RE: Steam Drum and Sec. VIII
"...intervening valves on interconnecting piping between steam drum and boiler" (?????!!??)
I have never heard of valves between the steam drum and the "boiler"
Are you fabricating your own homemade boiler "on the fly" ?
Will the eventual product bear any kind od ASME or ISO stanp or seal ?
Will this boiler be installed in IRAN ???
-MJC
RE: Steam Drum and Sec. VIII
Prior to WWII, it was not unusual to have the different parts of the boiler mfr'd by different fabricators, and the owner might have hand a hand in the design as well. Nowadays, few HRSG's are built in the boiler mfr's shop; almost all HRSG's are built piecemeal by various 3rd party fabricators in Korea.
Tody, the most common use for a sec VIII component in the boiler is when a stainless tubed economizer is used, for heat recovery boilers, fired heaters, and HRSG's. Sect I will not permit a water washed stainless component due to chloride stress corrosion issues, but a duplex stainless tubed economizer may be supplied as a sect VIII component.
RE: Steam Drum and Sec. VIII
Yes, both the Boiler and Steam drum must be ASME certified and stamped. This boiler will be installed in a refinery,and the refinery is not in IRAN!!!
Do you know whether the steam drum can be designed and stamped under sec. VIII, when the Boiler itself is Sec. I?
davefitz,
I want to exclude the Steam Drum from scope of the Boiler Manufacturer. I just want to know if there is any code related problem if manufacturer of steam drum uses Sec. VIII and put U stamp on it, when the rest of the Boiler gets S stamp.
RE: Steam Drum and Sec. VIII
Refer to the ASME VIII, Div 1:
U-1(g)(1) Unfired steam boilers shall be constructed in
accordance with the rules of Section I or this Division [see
UG-125(b) and UW-2(c)].
As such, the Steam Drum can be fabricated elsewhere, U stamped and assembled into the boiler ASME Section I.
Howzat,
cheers,
gr2vessels
RE: Steam Drum and Sec. VIII
RE: Steam Drum and Sec. VIII
If the drum is part of the fired sec. I, you can not stamp it sec VIII-1 period. you can construct the complete boiler and then use a drum separator w/ sec VIII-1 stamp.
...but there is a company's boiler where the steam drum is built-in and it is stamped sec Viii-1.- I will find out for you how they manage to get away with it.
genb
RE: Steam Drum and Sec. VIII
Amir, if your "boiler" is located remote from your "steam drum" and are seperated by valves, where do you place the safety valves ?
The purpose of the safety valves is to protect both the boilers and the tubes in the event of a pressure excursion.
.......but you want isoltion valves in-between ?
Why do you need such valves and what code will govern the construction of these valves ?
Is this boiler generating superheated steam ?
Can you get your engineering supervisor to stand up-close to the boiler during start up ????
My opinion only...
-MJC
RE: Steam Drum and Sec. VIII
Sect I also has many other rules associated with the assumption of the drum being part of sect I- eg, gauge glasses, blowdown and blowoff connections, thermal sleeve for feedwater, etc.
It is unusual ( perhaps bizarre) to have an isolatable steam drum, but here are some unusual advantages - I had earlier mentioned the avoidance of a steaming economizer and higher temp spray water in one case, and one can also operate "dual pressure" with a sliding pressure superheater and constant pressure evaporator if a throttle valve is at the steam drum outlet. But it has to be carefully thought out- many years of experience are represented by the sect I rules, and skipping them is an invitation for big problems.
RE: Steam Drum and Sec. VIII
There isn't any danger if you follow the Code...
genb
RE: Steam Drum and Sec. VIII
I appreciate for all your comments.
Amir
RE: Steam Drum and Sec. VIII
a lot of homework was needed
gen blr