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tuanjim (Chemical) (OP)
29 Apr 05 5:58
Hi,

I hope this isn't too stupid a question but I'm not much of a piping specialist!
I need to sample off a 2" schedule 80 pipeline which may or may not be fully-flooded. This pilotng facility is yet to be built and I can pretty much dictate the sample point design. My initial thoughts were to use 1/4" Male NPT bored through fittings and insert a quill-type 45 degree insert facing into the direction of the flow. I was intending to have the guys just drill 1/4" NPT Female threaded holes in the pipe and screw the fittings into this because of the largish pipe wall thickness but even then I think the thread on the bored through male fittings will be too long and enter the flow which I really want/need to avoid. I'm also not sure about what sort of seal we'll get due to the rounded surface.
Does anyone have any ideas on how they would do this? Can we drill a 1/4" hole in the pipe and weld a female fitting to the outside for example? As I'm completely new to this I'm just not sure what's actually feasible.

Also, if we wanted to take a vertical 'slice' of this fluid, rather than a central tapping, do people know of any sampling devices we may be able to use?

Thanks very much for any info or advice!
bimr (Civil/Environmental)
29 Apr 05 11:29
An appropriate recommendation is not possible without understanding the purpose and conditions of sampling. For example, the fluid is? The pressure and temperature are? etc.
MJCronin (Mechanical)
29 Apr 05 13:04
tuan,

If the piping system is under pressure, simply install another "tee" and valve combination at the point that you want to sample....

The welding/threading you install should match the existing system...

Check an existing elbow or tee in the system for the propper materials and pressure class ( I am assuming the system was originally designed properly)

You will not need a quill or similar device with piping that is this small if the system is under pressure (most systems are)

MJC

  

handee (Chemical)
29 Apr 05 21:58
Right, just install a tee in the line, then a reducing bushing to the size you want...keep it all Sch 80 and you should be all set.

Fran McConville

itdepends (Chemical)
9 May 05 0:15
I agree with bimr- we need to know a bit more about the pipe.

Not fully flooded?- is this a gravity line? or a gas/fluid mixture.

Does the fluid contain solids- will they settle or stratify?- do you care? or are you sampling the liquid only.

Look forward to your replies

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