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
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
>
> 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:
>
> > 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)
> http://www.skypoint.com/~chrisw/
>
>
>
> =========================================
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> http://www.pipingoffice.us/
> =========================================
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