2 Bet this never happens….? WARNING TAG READS:“DO NOT SHUT VALVE WITH PROBE INSERTED”
3 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.
4 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.
5 Operator Safety must be always be considered. Conax’s SPA is used to insert a Sample Probe into a pressurized and sometimes caustic closed-loop system, thereforeOperator Safety must be always be considered.Conax’s SPA Design takes this under consideration with:Plasma Welded Stop CollarOptional Retaining Chain KitSST Warning TagThe 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.
6 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 KitSample 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 RequirementsStress & Wake Frequency Analysis of probe can be performed to validate the probe design if desired.
7 PG Gland Body with “Bonda Relief” Counterbore Options…PG Gland Body with “Bonda Relief” CounterboreIntegral metal ferrule provides:Secondary Mechanical SupportPositive insertion depth stop“Bonda Relief” credited to Mr. Joe BondaSr. Analyzer Engineer at ExxonMobilChalmette, Louisiana
9 Stress & Wake Frequency Analysis Overview (B) SPA Quote Request Form(C) In-house FEA CapabilitiesCalculations are based on ASME PTC 19.3 TW-2010Pipewells and SPA’s fall outside the scope of the ASME PTC specification but methods for predicting the FrequencyRatio and Stress levels within the probe can be applied to theSPA 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)
10 Laser Marked Sample Probe Laser Markings“---DOWNSTREAM---” and “---UPSTREAM---”
11 Sample Probe for a Cooling Water-Free Chlorine Analyzer ½” Sch 40 Hastelloy C276 Pipe Sample Probe withHastelloy C22 Sealing Gland Body and Flange
12 Sample Probe with Nozzle Support & Tapered Stop Collar
13 Design Benefits of the Sample Probe Tapered Stop Collar SerratedFlange FaceReduces flow-induced vibration by reducing the unsupported insertion length (“U”) for higher velocity applicationsInsures the precise insertion of the Sample Probe,Conax supplied Support Nozzle allows for a smaller diameter Sample Probe for Higher Pressure applications (πD2/4 x pressure)Reduces the entry of process fluids into the nozzle and the process valveDiaP(psi)F(lbs)10019.6⅜29.439.358.9178.5