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© Conax 2009 Company Confidential Process Analyzer Sample Probe Assembly (SPA)
© Conax 2009 Company Confidential Bet this never happens….? WARNING TAG READS: “DO NOT SHUT VALVE WITH PROBE INSERTED”
© Conax 2009 Company Confidential What is a Sample Probe Assembly? The Conax Sample Probe Assembly or “SPA” is designed to insert and retract a Sample Probe into a closed-loop pressurized process pipeline though a process isolation valve. The use of a Sample Probe facilitates the extraction of a representative product “Sample” (gas and / or liquid) from the process pipeline. The extracted sample is then analyzed to measure its physical and chemical properties. Sample Probes can be either a Retractable or Fixed Design. A retractable design allows the Sample Probe to be completely removed from the process pipeline whereas as fixed probes are permanently installed. Retractable Sample Probes can be replaced in the event they become plugged or corroded. In order to insert / retract a Sample Probe into a pressurized process pipeline, a process isolation valve and Compression Sealing Gland are required. The use of a Conax Packing Gland (PG) with either a Teflon® or Grafoil® Sealant has been the recognized “solution” in the Oil & Gas Industry. A Sample Probe can be either tubing or pipe fabricated from various materials as required by the process conditions. The common rule of thumb is to position the tip of the Sample Probe one-third to one-half into the inside diameter of process pipeline. Under high flow-rate conditions, this immersion depth will need to be reduced and / or supported via a nozzle support.
© Conax 2009 Company Confidential The angled end of the Sample Probe is typically positioned downstream to flow. Sample Probes with angled ends are designed to exclude dust, pipe-scale, and liquid drops from the extracted sample. The principal is momentum. If the particles and drops are heavier than the process fluid, they will be reluctant to make the sharp turn into the angled-end.
© Conax 2009 Company Confidential Safety Conax’s SPA is used to insert a Sample Probe into a pressurized and sometimes caustic closed-loop system, therefore Operator Safety must be always be considered. Conax’s SPA Design takes this under consideration with: Plasma Welded Stop Collar Optional Retaining Chain Kit SST Warning Tag The end-user is ultimately responsible for the operation of the SPA since the Conax PG gland is only rated for static conditions at full torque. Refer to the USER CAUTIONS on Conax’s SPA Bulletin.
© Conax 2009 Company Confidential What does Conax offer? Single source to insure correct design, materials and fit of the Sealing Gland to the Sample Probe. Capability to supply both the Sealing Gland and Sample Probe from various materials such as 316SST, 316LSST, NACE316SST, Monel, Hastelloy C276 and Hastelloy C22 based process corrosion requirements. Plasma welded machined stop collar. If the SPA is coated or electro polished we weld both sides of the collar eliminating crevices. SPA assemblies are available with an optional Retaining Chain Kit Sample Probes are available with laser markings to indicate installation depth and/or UPSTREAM and DOWNSTREAM orientation relative to the angled end. Experience selling to major Oil & Gas accounts worldwide. A SPA quote request form is available to identify the full range of process conditions such as Velocity, Pressure, Temperature, Physical Dimensions and Material Requirements Stress & Wake Frequency Analysis of probe can be performed to validate the probe design if desired.
© Conax 2009 Company Confidential PG Gland Body with “Bonda Relief” Counterbore “Bonda Relief” credited to Mr. Joe Bonda Sr. Analyzer Engineer at ExxonMobil Chalmette, Louisiana Integral metal ferrule provides: Secondary Mechanical Support Positive insertion depth stop Options…
© Conax 2009 Company Confidential
© Conax 2009 Company Confidential Stress & Wake Frequency Analysis Overview Calculations are based on ASME PTC 19.3 TW-2010 Pipewells and SPA’s fall outside the scope of the ASME PTC specification but methods for predicting the Frequency Ratio and Stress levels within the probe can be applied to the SPA in an effort to validate acceptability of the probe design. To perform the analysis it is vital to have the SPA Quote Request form filled out with key design details noted (i.e., fluid properties, geometry details, materials, etc.) For complex geometries, in-house FEA capabilities are also available for predicting Natural Frequencies & Stress levels. (A) Sample Analysis Report (one per unit) (B) SPA Quote Request Form(C) In-house FEA Capabilities
© Conax 2009 Company Confidential Laser Marked Sample Probe Laser Markings “---DOWNSTREAM---” and “---UPSTREAM---”
© Conax 2009 Company Confidential Sample Probe for a Cooling Water-Free Chlorine Analyzer ½” Sch 40 Hastelloy C276 Pipe Sample Probe with Hastelloy C22 Sealing Gland Body and Flange
© Conax 2009 Company Confidential Sample Probe with Nozzle Support & Tapered Stop Collar
© Conax 2009 Company Confidential Design Benefits of the Sample Probe Tapered Stop Collar Reduces flow-induced vibration by reducing the unsupported insertion length (“U”) for higher velocity applications Insures the precise insertion of the Sample Probe, Conax supplied Support Nozzle allows for a smaller diameter Sample Probe for Higher Pressure applications (πD 2 /4 x pressure) Reduces the entry of process fluids into the nozzle and the process valve DiaP(psi)F(lbs) ¼ ⅜ ½ ¾ Serrated Flange Face
© Conax 2009 Company Confidential Custom Engineered Sealing Glands for Critical Sample Probe Applications Primary Sealant Secondary Sealant Extraction Port
© Conax 2009 Company Confidential Adjustable Sample Probe with Special PG Body and Integral Kalrez O-Ring
© Conax 2009 Company Confidential Fixed / Welded Sample Probe Injection Quill with Spray Nozzle Other designs… 1¼” dia. x.120” wall with 2” ball valve
© Conax 2009 Company Confidential Thank you for your time – if you have any questions
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