Pressure Taps on Pump Discharge Line on Top of Pipe

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Hager Participant Join Date: Sep 2014 Posts: 3	Pressure Taps on Pump Discharge Line on Top of Pipe 09/21/2014 8:58 AM
	The common discharge line of condensate extraction pumps 3x50%, pump design flow 357m3/hr, pump discharge pressure 27.3 bar a, pipe size DN350 has 3 pressure transmitters in a horizontal line whose tapping has been taken from top of the pipe. Is it correct? As usually it is preferred to take tapping in a condensate line in center or below centerline of the pipe. Some justly it by saying as it is a discharge line the flow is turbulent not laminar and this tapping is justified for measuring pressure.
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#1 Re: Pressure taps on pump discharge line on top of pipe 09/21/2014 10:45 AM
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simonsd Power-User Join Date: Nov 2008 Location: Port Glasgow, Free Republic of Scotland Posts: 360 Good Answers: 30	#2 Re: Pressure Taps on Pump Discharge Line on Top of Pipe 09/22/2014 5:19 AM
	I think the main issue would be to ensure that the line is liquid filled. If it is I do not see why having the pressure tappings on top, side or below would have any significant impact on pressure (the pressure change for height in a 350mm line is insignificant compared to the operating pressure). Provided the line is liquid filled (which it should be on a pump discharge) then you will see the same pressure all the way around the circumference. Instinctively I would expect to see the pressure tappings on top of the line but I cannot justify that comment with any reasoning. I am not sure that the service has any significant impact but could you clarify the service e.g. is it condensate from a steam system or hydrocarbon condensate? __________________ Free advice guaranteed or your money back
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