Transcript Sample Probe Assembly Training 10

© Conax 2009
Process Analyzer Sample Probe Assembly (SPA)
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© Conax 2009
Bet this never happens….?
WARNING TAG READS:
“DO NOT SHUT VALVE WITH PROBE INSERTED”
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© Conax 2009
What is a Sample Probe Assembly?
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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.
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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.
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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.
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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.
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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.
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Options…
PG Gland Body with “Bonda
Relief” Counterbore
Integral metal ferrule provides:
• Secondary Mechanical Support
• Positive insertion depth stop
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“Bonda Relief” credited to Mr. Joe Bonda
Sr. Analyzer Engineer at ExxonMobil
Chalmette, Louisiana
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Stress & Wake Frequency Analysis Overview
(B) SPA Quote Request Form
(C) In-house FEA Capabilities
• 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.
(A) Sample Analysis Report
(one per unit)
• 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.
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Laser Marked Sample Probe
Laser Markings
“---DOWNSTREAM---” and “---UPSTREAM---”
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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
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Sample Probe with
Nozzle Support &
Tapered Stop Collar
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Design Benefits of the Sample Probe Tapered Stop Collar
Serrated
Flange Face
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 (πD2/4 x pressure)
Reduces the entry of process fluids into the nozzle
and the process valve
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Dia
P(psi)
F(lbs)
¼
100
19.6
⅜
100
29.4
½
100
39.3
¾
100
58.9
1
100
78.5
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Custom Engineered Sealing Glands
for Critical Sample Probe Applications
Extraction
Port
Primary
Sealant
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Secondary
Sealant
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Adjustable Sample Probe with Special PG Body
and Integral Kalrez O-Ring
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Other designs…
1¼” dia. x .120” wall
with 2” ball valve
Fixed / Welded
Sample Probe
Injection Quill with Spray Nozzle
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Thank you for your time – if you have any questions
e-mail [email protected]
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