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I have a question regarding the Boiler Mechanical Completion (MC) and Commissioning /Start-UP.
Here is the situation. Steam Genrator/Boiler has associated units such as Utility Water, Potable water and tanks, Fire Water, Deminerlizeed Water and condensate, Boiler Feed Watrer (BFW) and Deaerator, Limestone and ash handling unit, Compressed Air, etc. depending on design that all have to be installed to complete a steam generator plant. All these units must be Mechanically Complete before commissioning (putting fire or igniting the boiler). My question - should the MC of these units be a predecssor to MC of the Boiler itself, OR they can be Mechanicalley complete which icludes being precommissioned (loop checked, etc.), a little beffore or after the Boiler MC iitself, as long as they have been Mechanically completed prior to igniting the Boiler. OR, these units, so called pre-requisite units must mechanicaly complete AND further be commissioned prior to igniting the boiler? So far I have made the tie (FF=0) such that all these unit's MC drive the completion of Boiler MC.
Need someone who actually has done a boiler scheduling or a commissiong engineer to advise. Looking for sequence of events. Any help is appreciated. Thanks.
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Masood,
The normal time usage would be more like :
Erection: ==============>
Pre-commissioning: ===========>
Commissioning: ===================>
Of corse that most likely during even commisisoning phase you will have to work on the boiler but that happens allways under the authorization of the Commissioning team and normaly requries some protocols (safety measures also) to be issued. For the planning purpose normaly it should be considered a certain overlap between Erection and pre-commissioning (before you can start anything all mechanical works have to be checked and a BIG number - normally thousands - of loops checks ahve to be tested, as well as function checks. Only after all precommissioning activities (as well as cold commissioning of all auxiliary system) are done you can start the hot commissioning. One hint: Boiler suppliers have normaly on their scope of work the definition on how to erect and how to commission their boiler - on good pratice is to request to potencial biders (assuming you are a EPC) to submit a Time Schedule for their supply including erection and commissioning.
Jose/Hlami/Gary,
Than you guys for your time explaining the works and steps. I may need more of your advise, but later on. For now, I'm doing a high level (L II) schedule since we are at the start of the engineering.
Yes, I have units or areas for the steam boilers/generator. These are: Demin & condensate polsihing pakg (Incl tanks), Fire Water/tanks, Potable water/tanks, Utility Water, Limestone & ash handling unit, Air compressors unit, Fuel Oil/tanks, and Steam Boiler itself which contains Boilers pkg(FDF, economizer, boiler house,FGD common systems, stack, etc.), and BFW & Deaerators/tanks and buildngs. All these system can be independently erected, pre-comm'd and comm'd as you suggested.
Jose, from what you pointed out as being hot comissioned, I see only BFW and the Deaerator that will be commissioned the same time as boiler and already part of the boiler pkg. Coorect me if I'm wrong. Here is the typical display, and for the lack of better drawing option, I use the existing resource, this characther: = and >
- Fire Water/Tanks:
Erection==> pre-comm ==> Comm
- Demin/condensdate polishing pkg:
Erection ====> Pre-comm =======>Comm
- Boiler pkg (BFW & Deaerator/FDF/Compressor/Economizer, etc):
Erection =======> Pre-comm ===========>MC of the Boiler==> Comm the Boiler (Fire the boiler, performance test......... leading to Steam available milestone, steam avail for steam blowing and other units
Shorter or longer ==> represents time, and for the FW and Demin and the rest othe areas not show, they all tie to MC of the Boiler Finish to start(FS) and from the high level they show over lap like below
Pre-comm
===============>
Comm
=========================>
Please confirm or correct otherwise
Hlami, for the CC and HC you mentioned, at this point I resort to above for the level II schedule,
but would like to see example of your CC and hot HC, say for Dimin and Fire water
again, thank you all
Dear Massod
A Steam Boiler is a unit to much big and therefore due to this and also due to the fact that it will be requried to commission individual systems prior to Boiler Hot commissioning it would be wise to treat each system individualy - meaning issuing ECC's (erection clearence certificates) for each one of them and handing over to commissioning teams also by systems.
Note that for instance before having the boiler ready for hot commissioning you need to commission the Fire water system, the Air system, etc, etc.
So make a ECC milestone for each one of the systems - then link them as predecessors to their commissioning activities. All the individual systems commissioning activities will all link with a common successor milestone "Boiler ready for Hot commissioning" - then you can start your boiler hot commissioning.
(Some systems can only be commissioned in hot mode: Deaherator / condensate / etc.)
Usualy the one of the successors of the Boiler hot commissioning is the steam blow with a SS + some day(s) lag.
For the sequences I would recomend to work closely with your Commissioning Engineer and have a look on the P&IDs / PFDs / System description / Etc.
Hope still helps in anyway
BR
JMFrade
There should actually be 2 phases when it comes to Commissioning, Cold commissining and Hot Commissioning. Some of cold commissioning activities can start before Mechanical Completion even though this is not common practice in the industry, however Hot commissioning can only start after MC, so ideally your CC should be successor to MC, and HC should be successor to CC. If I were you i would link Mechanical Completion with Cold Commissioning as FS and update actual information as project progresses and take notes.
Hope it helps.
It may be that a particular installation sequence will suit the layout of the boilerhouse but apart from that, just make MC of boiler & all ancilleries FS(0) to commissioning the system.
Email: PPadmin@planningplanet.com
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