Could you please let me know how would you make sure that the dewpoint for
the two inlet and outlet points will be the same ? Since the air will flow
through a distance in the piping, the air temperature might slightly
different than the initial temperature due to the thermal exchange from pipe
surface. Is there any clearance for the dewpoint temperature ?
Thanks.
Regards,
cckla
>
>
>
>
>
> I have seen two more methods being used for drying of pipe after
hyrdotest.
>
> One way to ensure that the line is dry after hydro testing is to measure
> the dew point at the point where the air is introduced in the system for
> drying and measure the same at the point where the air goes out of the
> pipe. When the dew point readings at both the ends are same, the pipe is
> dry.
>
> Some people use a rubber gasket burst method. i.e. a rubber gasket is
> clamped on one end of the pipe (there will be no flange on the other side,
> only clamp) Air is blown through another end, when the built up pressure
> ruptures the gasket, the air that gushes out takes all the water and
> particles with it. (However some people are not satisfied with this.)
>
> Have a nice day.
> -Mandar.
> This message comes from Mandar's desk.
>
>
>
>
>
> "George
> McKinney" To:
<PipingDesign@yahoogroups.com>
> <gmckinney@augus cc:
> taeng.com> Subject: Re: [PipingDesign]
Re: Commissioning of aircraft petrol filling station
>
> 12-10-04 05:04
> PM
> Please respond
> to PipingDesign
>
>
>
>
>
>
>
> cckla:
> Comments on your pipe cleaning/testing:
> My comment on disconnecting the pump is related to my experience with gas
> compression pipeline testing/commissioning. There, the typical situation
> is to test piping installations by sections. Compressors/pumps are tested
> by the manufacturer, and are almost always connected into the system by
> flanges. So, since they are pre-tested and demonstrated good for the
> pressure, typical procedure is to test piping up to the pump, with it
> isolated by valves or blind flanges. This would take care of your concern
> about damaging the pump.
> On the piping, I agree with the other users - if possible, go with a gas
> test, using some inert type gas. If you use water, you will want to have
a
> BIG compressed air source to remove the residue - and if you blow enough
> air, you will probably pick up a lot of left-over weld scale/dirt/trash,
> that will help smooth out the start up process. One procedure that I had
> seen is to open the line at the downstream end, and place a white painted
> piece of plywood about 2-4 feet from the end. Blow until you stop getting
> particles on the plywood. Given that you will be moving aircraft fuel,
you
> want to get as much out as possible - what you clean out at this point
will
> help on filter life and maintenance on start-up.
>
> George McKinney
> ----- Original Message -----
> From: cckla
> To: <a href="/group/PipingDesign/post?postID=4GETLTosSX1z99UWgYPV1juKNEhLqdpDcYzT0U_E9VO1LZiahqMvFJJW_oNHKm-ltysNvHOBSPfti1lpZ-jxfGkPnRMgcA">PipingDesign@yahoogroups.com</a>
> Sent: Tuesday, October 12, 2004 12:05 AM
> Subject: Re: [PipingDesign] Re: Commissioning of aircraft petrol filling
> station
>
>
> Dear Mr George McKinney,
>
> We are going to test for its operation, icluding pump, piping and tank.
> At
> the same time, we also do for leak test. I understand that we can dry
> the
> piping by purging the piping with nitrogen gas. But, could we do the
same
> when the pump is connected to the piping ? I afraid it will damage the
> internal parts of the pump. By using water as a test medium, we are
> hoping
> that the whole system can be totally dried without leaving any problems
> to
> the system in the future.
>
> Please guide me.
>
> Thank you.
>
> Regards,
> cckla
>
> ----- Original Message -----
> From: "George McKinney" <gmckinney@augustaeng.com>
> To: <PipingDesign@yahoogroups.com>
> Sent: Friday, October 08, 2004 10:33 PM
> Subject: Re: [PipingDesign] Re: Commissioning of aircraft petrol filling
> station
>
>
> >
> > Just what kind of test pressure/conditions are you looking at? Is
this
> a
> leak test, or for actually qualifying a maximum pressure/design
pressure?
> And concern for the pumps - why not take them out of the system/blind
off
> -
> I would assume they are pre-tested by the manufacturer?
> >
> > George McKinney
> > ----- Original Message -----
> > From: Christopher Wright
> > To: <a href="/group/PipingDesign/post?postID=4GETLTosSX1z99UWgYPV1juKNEhLqdpDcYzT0U_E9VO1LZiahqMvFJJW_oNHKm-ltysNvHOBSPfti1lpZ-jxfGkPnRMgcA">PipingDesign@yahoogroups.com</a>
> > Sent: Friday, October 08, 2004 10:32 AM
> > Subject: Re: [PipingDesign] Re: Commissioning of aircraft petrol
> filling
> station
> >
> >
> >
> > On Oct 7, 2004, at 11:16 PM, RICK wrote:
> >
> > > why not opt for pneumatic test? i think it`s much less cumbersome.
> > And much more dangerous.
> >
> > Christopher Wright P.E. |"They couldn't hit an elephant at
> > chrisw@skypoint.com | this distance" (last words of Gen.
> > ...................................| John Sedgwick, Spotsylvania
> 1864)
> > <a href="http://www.skypoint.com/~chrisw/">http://www.skypoint.com/~chrisw/</a>
> >
> >
> >
> > =========================================
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