Dear all,
The gasket bursting cannot ensure that all the
moisture is expelled out. What remains inside the pipe
is a mixture of air and moisture. The partial presuure
of moisture may come down but it will not be zero.
There ought to be other means! Please check.
Regards.
C. V. Gangadharan.
--- cckla <cckla@pd.jaring.my> wrote:
> 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
>
> ----- Original Message -----
> From: <mapte@technip.com>
> To: <PipingDesign@yahoogroups.com>
> Sent: Wednesday, October 13, 2004 12:12 PM
> Subject: Re: [PipingDesign] Re: Commissioning of
> aircraft petrol filling
> station
>
>
> >
> >
> >
> >
> >
> > 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: PipingDesign@yahoogroups.com
> > 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: PipingDesign@yahoogroups.com
> > > 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:
> > >
>
=== message truncated ===
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