EPRI Isokinetic Sampling Nozzles (Probes) for Gases and Liquids

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" colspan=2 height=100 BGCOLOR="#CCCCFF" TEXT="#080000" bgproperties="fixed" background="0d200640egdysm.jpg"> <div> <FONT SIZE="6" COLOR="#000066" FACE="Arial" ><B>Jonas, Inc.</B></FONT><FONT SIZE="5" COLOR="#000099" FACE="Arial" ><B> </B></FONT><FONT SIZE="1" COLOR="#000099" FACE="Arial" ><B>   </B></FONT><FONT SIZE="3" COLOR="#000099" FACE="Arial" ><B> </B></FONT><B>|     </B><A HREF="index.htm" TARGET="_top" TITLE="Jonas, Inc."><U><B>Home</B></U></A><B>   </B><B> </B><B> |    </B><A HREF="contact.htm" TARGET="_top" TITLE="Contact Us"><U><B>Contact Us</B></U></A><B>   </B><B>                                       </B></div> <div> back to<B>  </B><A HREF="products.htm" TARGET="_top" TITLE="Products"><U><B>Products</B></U></A><B>  </B><B>|  </B><A HREF="sample_design.htm" TARGET="_top" TITLE="Design of Sampling Systems for Steam and"><U><B>Sampling System 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COLOR="#000000" FACE="Arial" > subatmospheric to 5000 psig (34.5 MPa)  </FONT></div> <div> <B>Temperature range:</B><FONT SIZE="2" COLOR="#000000" FACE="Arial" >  Up to 1200ºF (650ºC) </FONT></div> <div> <B>Attachments:</B><FONT SIZE="2" COLOR="#000000" FACE="Arial" >  welded boss or bolted flange </FONT></div> <div> <B>Background </B></div> <div> Sampling gases and liquids for on-line and grab sample chemical analysis can be a major source of errors.  Up to several orders of magnitude concentration changes of dissolved and suspended impurities have been observed when sample withdrawal, cooling, or transport are not properly performed.  The Multi-port Steam Sampling Nozzles (Probes) are rarely used because of their complexity, cost, non-isokinetic characteristics, and problems with use in large pipes.  A more appropriate and functional design was developed and the design and performance of these nozzles was verified in the Electric Power Research Institute (EPRI) research project RP2712-8.  This design was then included in ASTM D1066, "Standard Practice for Sampling Steam".  Additional information about the need for isokinetic sampling and the proper design and operation of a sampling system can be found in a technical article entiled <A HREF="sampling_savvy.htm" TARGET="_top" TITLE="Sampling Savvy"><U>"Sampling Savvy"</U></A>.   </div> <div> <B>Description </B></div> <div> A photograph of a Weld-in Nozzle (probe) design is shown in Figure 1 and Flanged Nozzles are shown in Figure 2.  The nozzles extract a representative isokinetic sample from a flow region removed from the pipe surface and at the average flow velocity of the sample fluid.  This arrangement results in the withdrawal of the sample with representative concentrations of dissolved, suspended, and volatile constituents. </div> <div> An appropriate nozzle (probe) is designed for the desired sample flow and typical conditions of the sample fluid.  When the flow velocity through the pipe changes, sample flow should be adjusted to maintain isokinetic sampling.  </div> <DIV ALIGN="LEFT"></DIV> <div> <TABLE BORDER="0" CELLPADDING="1" CELLSPACING="1" WIDTH="511" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP COLSPAN=2 HEIGHT= 241 ><NOBR><div> <IMG SRC="180c2eb0.jpg" border=0 width="450" height="235" ALT="Weld-In EPRI Isokinetic Sampling Nozzle (Probe)" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP COLSPAN=2 HEIGHT= 37 WIDTH="507"><div> <B>Figure 1.  Weld-in EPRI Isokinetic Sampling Nozzle</B></div> </tD> </tR> <tR> <tD VALIGN=TOP COLSPAN=2 HEIGHT= 215 ><NOBR><div> <IMG SRC="17ec2d10.jpg" border=0 width="450" height="209" ALT="Three examples of Flanged EPRI Isokinetic Sampling Nozzles" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP COLSPAN=2 HEIGHT= 32 WIDTH="507"><div> <B> Figure 2. Flanged EPRI Isokinetic Sampling Nozzles</B></div> <div> <B>(left to right - Class 2500, Class 300, Class 600 flanges)</B></div> </tD> </tR> </TABLE></div> <div> Each Nozzle (probe) is designed with considerations of vortex shedding, resonance, vibration, erosion, and strength of the attachment to the pipe. </div> <div> <I><B>Note:</B></I>  Sample flow rate and velocity, tubing size, distance to primary cooler, pressure drop through the system, etc. should all be considered when designing a sampling system.  For more information, please visit our <A HREF="sample_design.htm" TARGET="_top" TITLE="Design of Sampling Systems for Steam and"><U>Sampling System Design</U></A> page.</div> <div> <B>Materials </B></div> <div> Jonas, Inc. recommends the use of A182-316/316LSS because of the material's resistance to corrosion and erosion. Other materials are available upon request.</div> <DIV ALIGN="LEFT"></DIV> <div> <B>Pressure - Temperature Rating</B><B> fo</B><B>r Various Materials</B></div> <div> <TABLE BORDER="2" CELLPADDING="2" CELLSPACING="1" WIDTH="530" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP ROWSPAN=2 HEIGHT= 16 WIDTH="95"><div> <B> </B></div> <div> <B>MATERIAL</B></div> </tD> <tD VALIGN=TOP COLSPAN=7 WIDTH="392"><div> <B>TEMPERATURE (F)</B></div> </tD> </tR> <tR> <tD VALIGN=TOP WIDTH="52"><div> 70</div> </tD> <tD VALIGN=TOP WIDTH="48"><div>  200</div> </tD> <tD VALIGN=TOP WIDTH="54"><div> 400</div> </tD> <tD VALIGN=TOP WIDTH="54"><div> 600</div> </tD> <tD VALIGN=TOP WIDTH="55"><div> 800</div> </tD> <tD VALIGN=TOP WIDTH="60"><div> 1000</div> </tD> <tD VALIGN=TOP WIDTH="51"><div> 1200</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="95"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="16" ALIGN="bottom" WIDTH="95" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP COLSPAN=7 WIDTH="392"><div> <B>PRESSURE (PSI)</B></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="95"><div> A.I.S.I. 316</div> </tD> <tD VALIGN=TOP WIDTH="52"><div> 7800</div> </tD> <tD VALIGN=TOP WIDTH="48"><div> 7800</div> </tD> <tD VALIGN=TOP WIDTH="54"><div> 7250</div> </tD> <tD VALIGN=TOP WIDTH="54"><div> 7100</div> </tD> <tD VALIGN=TOP WIDTH="55"><div> 6950</div> </tD> <tD VALIGN=TOP WIDTH="60"><div> 5800</div> </tD> <tD VALIGN=TOP WIDTH="51"><div> 2720</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="95"><div> F-11</div> </tD> <tD VALIGN=TOP WIDTH="52"><div> 7350</div> </tD> <tD VALIGN=TOP WIDTH="48"><div> 7350</div> </tD> <tD VALIGN=TOP WIDTH="54"><div> 7350</div> </tD> <tD VALIGN=TOP WIDTH="54"><div> 7350</div> </tD> <tD VALIGN=TOP WIDTH="55"><div> 7350</div> </tD> <tD VALIGN=TOP WIDTH="60"><div> 2898</div> </tD> <tD VALIGN=TOP WIDTH="51"><div> 504</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 20 WIDTH="95"><div> F-22</div> </tD> <tD VALIGN=TOP WIDTH="52"><div> 7224</div> </tD> <tD VALIGN=TOP WIDTH="48"><div> 7224</div> </tD> <tD VALIGN=TOP WIDTH="54"><div> 7224</div> </tD> <tD VALIGN=TOP WIDTH="54"><div> 7224</div> </tD> <tD VALIGN=TOP WIDTH="55"><div> 7098</div> </tD> <tD VALIGN=TOP WIDTH="60"><div> 3192</div> </tD> <tD VALIGN=TOP WIDTH="51"><div> 546</div> </tD> </tR> </TABLE></div> <div> <B>Steam Sampling</B></div> <div> For superheated steam applications, it is not recommended to install the Nozzle in locations where the steam temperature is not at least 100oF above the saturation temperature.</div> <div> It is not recommended to install the Nozzle immediately after desuperheaters, in locations where there are large temperature changes, or where there is high carry-over of sodium hydroxide.  Where these conditions exist, there should be more frequent inspection of the Nozzle, Nozzle attachment, valves, and welded tubing up to the primary cooler.  If installed downstream of desuperheating sprays, the Nozzle location should be far enough downstream where complete mixing has occurred.   </div> <div> <B>Installation</B></div> <div> Installation, operation, and inspection of the Nozzle is the responsibility of the user.  See “<A HREF="install.htm" TARGET="_top" TITLE="Nozzle Installation"><U>Design, Installation, and Operation of Jonas, Inc. Isokinetic Sampling Systems</U></A>” for more information.  After installation, the pipe attachment - nozzle - isolation valve assembly should be hydrotested in accordance with all applicable Codes and Procedures prior to service.</div> <DIV ALIGN="LEFT"></DIV> <div> <A HREF="nozzle_quote.htm" TARGET="_top" TITLE="Request a Nozzle Quote"><U><B>Click Here to Request a Quote or to Place an Order</B></U></A></div> <div> <A HREF="install.htm" TARGET="_top" TITLE="Nozzle Installation"><U><B>Click Here for Recommended Installation and Operating Procedure</B></U></A></div> <div> <IMG SRC="1e266430.gif" border=0 width="358" height="67" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> </td> </tr></table></body>