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Thermowells

Thermowells
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Data sheet Date Page THERMOWELLS CONSTRUCTION FROM BARSTOCK OR FABRICATED A thermowell is a thermally conductive socket recommended to: • • Protect the delicate instrument sensing elements against corrosive effects. Permit instrument interchange or calibration check without disturbing or closing down the process. Thermowells are available for high pressures, high temperatures and high velocity applications. Selected on the basis of pressure, temperature, flow, vibration and corrosion service parameters. ATEX approvals available under our PCI TEMA brand. DESCRIPTION F - THE INSTRUMENT CONNECTION It is usually a female thread axially aligned with the bore into which the instrument mounting threads or capillary bushing is screwed but other connections can also be supplied. BORE It is the inside cylindrical diameter of a thermowell. The 1/4", 3/8" and 1/2” nominal bore are thermowell standard. S - THE INSTRUMENT INSERTION LENGTH Commonly called the «S» or the «L» dimension, it is the length from the top oft the mounting threads of a thermometer to the end of its stem or from the threads of a union bushing on a fixed extension or a capillary, to the end of the extension. E - SHANK CONFIGURATION It is the shape of that portion of a thermowell that is inserted into the process. The tapered shank is recommended as opposed to a stepped or straight shank due to the superior strength and vibration resistance. T - LAGGING EXTENSION Show as «T», it is used when the vessel or pipe into which the thermowell is inserted, is insulated. This is the extra length between the process connection and the instrument connection of a thermowell, which is determined by the insulation thickness. The standard lagging extension is 3” except it is 2" for the thermowells with 2-½” «U» dimensions. Other are available on request P - THE PROCESS CONNECTION It is that portion of the thermowell which provides the mechanical connection with the vessel or pipe. These connections can be integral male thread, prepared surface for welding flanges for mechanical pressure seals, or combinations thereof . Thermowell standard process threads are ½", ¾" and 1" NPT. Standard flanges are raised face or ring joint types, dimensioned to ASA B 16.5; standard flange sizes are 1", 1- ½” and 2” with rating from 150 lbs to 900 lbs. Standard weld in sizes are for ¾" and 1" nominal pipe. Other size process connections can be provided on request. U - THE THERMOWELL INSERTION LENGTH It is commonly called the «U» dimension, it is that portion of the shank from the process connection to the tip of the shank which is inserted into the process area. _______________________________________________________________________________________________ PCI (Process System Solutions) Ltd, Unit 7 Slaidburn Crescent, Southport, Merseyside, PR9 9YF, UK, Tel: +44 (0) 1704 509090, Fax: +44 (0) 1704 509091, email: sales@pci-instruments.com, Website: www.pci-instruments.com

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Data sheet Date Page MATERIAL AND IDENTIFICATION Standard material: AISI 316 Every thermowell is supplied clearly identified with: - Tag – Material and «U» dimension – Flange size – Rating and material etc. - Standard materials: AISI 316 / 316-Ti / 304 / 321 - Special materials such as: Duplex / Monel / Titanium / Nickel / Hastelloy C276 / Hastelloy C4 / Inconel 600 / etc. - Special materials (sheets) for coating wetted parts: Tantalum / PFTE / Hastelloy C276 / Hastelloy C4 / Zirconium. OPTIONAL DOCUMENTATION - Construction drawing - Hydrostatic test pressure - Dye penetrating test -...

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Data sheet Date Page MOUNTING STYLES AND DIMENSIONS Fabricated - threaded - straight STANDARD DIMENSIONS Process connection Tube dimensions P bxB Bar stock - threaded - stepped STANDARD DIMENSIONS Ø Bore Diameter Process connection Sizes P B E b 12. ½“ NPT / BSP 6.5 16 7 12. 6.5 19 ¾“ NPT / BSP 7 9 19 15 12. 6.5 22 1“ NPT / BSP 7 9 22 15 Bar stock - threaded - straight STANDARD DIMENSIONS Ø Process connection Diameter Bore Sizes P B b ½“ NPT / BSP ¾“ NPT / BSP 1“ NPT / BSP Bar stock - threaded - tapered STANDARD DIMENSIONS Ø Diameter Process connection Bore Sizes P B E b ½”, ¾“ NPT / BSP 1“...

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Data sheet Date Page Bar stock - weld in - stepped STANDARD DIMENSIONS Ø Diameter Process connection Bore Sizes P B E b 6.5 9 6.5 9 Bar stock - weld in - tapered Process connection P ¾“ PIPE (Ø 27) 1“ PIPE (Ø 33) Bore Sizes TWF1-F: Fabricated - flange connection - straight TWB1-F: Bar stock - flange connection - stepped TWB4-F: Bar stock - flange connection - tapered STANDARD FLANGES Sizes THERMOWELL DIMENSIONS b B E Same as threaded thermowells TWF1 TWB1 TWB4 Bar stock – flange connection - straight - wetted parts protected OPTIONAL EXTRA Wetted part covered by special material...

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Data sheet Date Page THERMOWELLS FLANGED Barstock standard type Barstock with rotating or welded flange. Wetted parts in: Hastelloy C276,C4, Nickel, Titanium Two pieces for flange mounting. Wetted parts in: Stainless steel 316, Hastelloy C276,C4, Nickel, Tantalum, Zirconium, Titanium Full penetration Partial full penetration For extremely long immersion length with ip from barstock Forged type one piece without welding Barstock Wetted parts covered by: Hastelloy C276,C4, Tantalum, Zirconium, Nickel, Halar, PFTE THERMOWELLS THREADED, WELD IN, SANITARY, CUSTOMER DRAWING Weld-in type according...

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