Goa Instruments

A Thermowell is a protective enclosure for Temperature Gauges and Temperature Sensors ( Inserts), which enhance the life of the Inserts from the corrosive and abrasive( harsh) service conditions at the installation point without affecting the performance of the Temperature Sensors or Gauges. A Thermowell allows the temperature sensor to be removed and replaced without compromising either the ambient region or the process.

We at Goa Instruments, strive to provide Thermowells, which suit the Process Parameters like Pressure, Temperature, Density, Viscosity, and Velocity in accordance with International PTC Standards.

Three Major Types of Thermowells.

Using Bar

Bar Stock Flanged
Bar Stock Threaded
Bar Stock Weld In

Using Pipe & Bar

Fabricated Flanged
Fabricated Threaded
Fabricated Weld In

Bar Stock Thermowells are offered for Insertion Lengths up to 600mm as a Standard.

Insertion Lengths can also be provided up to 900mm in Bar Stock if required.

Fabricated Thermowells are generally preferred for Insertion Lengths above 600mm.

We have a IN HOUSE Wake Frequency Calculator , in accordance with ASME PTC 19.3 TW-2010 for determining the Insertion Length and the Type of Construction best suited for the Process Parameters as required by the Client.

Our extensive internal database, on material selection, for the Thermowells ,assist us in recommending and suggesting a suitable MOC for the product which will bring out the Optimum performance of the Thermowells under the process parameters and different types of Process Fluids.

We also offer Thermowells with Sleeves, Coatings and Linings customized to suit the Client’s requirements.

Thermowells with more than one material as MOC can also be offered for minimizing cost and improving the efficiency, response and longetivity of the Thermowell under harsh and corrosive conditions.

Specifications for Bar stock Thermowell.
Type:	Bar Stock Flanged ( BF), Bar Stock Threaded (BT), Bar Stock Weld In (BW)
Std rod diameter in mm	28,32,34,36,45,50,55 (any other on request). Hex Head can also be provided
Material of Construction(M.O.C) For Bar and Flange :	SS304, SS316, SS310, SS321, SS446, SS316L, SS317, CS, A105 INCOLOY- 825, INCONEL- 600, INCOLOY-800, HASTELLOY C-276, MONEL-400, TITANIUM-II, NICKEL-200, KANTHAL (Any other on request)
CONSTRUCTION	Straight, Tapered, Stepped
INSTRUMENT CONNECTION	½”NPT(F), ½”BSP(F), ½”BSPT(F), PF(F), NPSM(F) (any other on request) in all thread sizes
PROCESS CONNECTION	For Flanged Type (As per ANSI, BS, JIS, DIN or any other) Size - ½”, 1”, 1 ½”,2”,3” (any other on request) Rating - 150#, 300#, 600#, 900#, 1500#, 2500# Facing - RF, FF, RTJ, LT, LG, WNRF, SORF (any other on request) For Threaded Type Size - ¼”, 3/8”, ½”, ¾”, 1”, 1.1/4”, 1.1/2” ( Any other on request) Threads - M18X1.5, M20X1.5, M24X1.5, M27X2, M33X2 (any other on request) NPT, BSP, BSPT, PF, NPSM (any other on request) For Weld In Type Socket Weld, Direct Weld.
BORE in mm	6.5, 7, 8.5, 9, 10.5, 11, 12, 13 (any other on request, suitable for the Insert OD)
COLD END DIAMETER in mm	Provided as per requirement
HOT END OD in mm	Provided as per requirement
INSERTION LENGTH “U” in mm	Provided as per requirement
EXTENSION LENGTH ”T” in mm	Provided as per requirement
TIP THICKNESS in mm	Provided as per requirement( Standard-6mm)
WALL THICKNESS in mm	2.5mm as a standard ( Any other as per Bore / Hot End OD size)
SURFACE FINISH	16-32 Rs as standard 4 to 12 Ra on request
WELDING FOR FLANGED TYPE TW	By TIG( Argon) “V” Groove welding on both sides of Flange.
ADDITIONAL REQUIREMENTS	Ultrasonic Test for Weld Joints Radiography Test for Bore Concentricity Radiography Test for Weld joints Full Penetration Welding. IBR ( Steam , Feed Water Service) For H2 Service( Hardness Check, Post Weld Heat Treatment, Ferrite No Test) NACE ( MR-0175, MR-0103) Ti, Ni, HaC,Ta Sleeve ( only for straight Construction), Sleeve thickness and Construction of Thermowell as per requirement PTFE, PFA, PVDF , Stellite, Tungsten Carbide Coating, coating thickness as per requirement Special Cleaning for Oxygen Service. Stubs/ Nozzles/ Expanders/ Reducers/ End Fittings(Weldolet, Sockolet, Half Coupling, Coupling, Latrolet) can also be also provided Customized special Design Thermowells also can be manufactured.

Specifications for Fabricated Thermowells.
Type:	Fabricated Flanged (FF), Fabricated Threaded (FT), Fabricated Weld In (FW)
STD BAR DIAMETER in mm	28,34,45,50,( Any other on request) .
PIPE SIZE & SCHEDULE	½”Sch 40, ½” Sch 80, ½”Sch 160, ¾”Sch 40, 3/4:”Sch 80( Any other on request)
CONSTRUCTION	FABRICATION TYPES Pipe to Pipe Pipe to Bar Bar to Bar Tail Sensing Portion in Bar Stock for all of the above for faster response time.
MOC FOR PIPE, ROD , FLANGE	SS304, SS316, SS310, SS321, SS446, SS316L,SS317, CS INCOLOY- 825, INCONEL- 600 ,INCOLOY-800 , HASTELLOY C-276, MONEL-400, TITANIUM-II, NICKEL-200, KANTHAL, ( Any other on request)
INSTRUMENT CONNECTION	½” NPT(F),½”BSP(F),BSPT(F),PF(F),NPSM(F)( any other on request) in all thread sizes.
PROCESS CONNECTION	For Flanged Type( As per ANSI, BS ,JIS, DIN or any other) Size - ½”, 1”, 1 ½”, 2”, 3” (any other on request) Rating - 150#, 300#, 600# Facing - RF, FF, LT, LG, SORF (any other on request) For Threaded Type Size - ¼”, 3/8”, ½”, ¾”, 1”, 1.1/4”, 1.1/2” ( any other on request) Threads - M18X1.5, M20X1.5, M24X1.5, M27X2, M33X2 (any other on request) NPT, BSP, BSPT, PF, NPSM (any other on request) For Weld In Type Socket Weld, Direct Weld.
WELDING FOR FLANGED TYPE TW	By TIG( Argon) “V” Groove welding on both sides of Flange. Full penetration Welding for Pipe to Pipe, or Pipe to Bar or Bar to Bar.
SURFACE FINISH	16-32 Ra as standard
COLD END DIAMETER in mm	Provided as per requirement
HOT END OD in mm	Provided as per requirement
INSERTION LENGTH “U” in mm	Provided as per requirement
EXTENSION LENGTH ”T” in mm	Provided as per requirement
TIP THICKNESS in mm	6mm or 8 mm as Standard
WALL THICKNESS in mm	As per the Pipe Schedule
ADDITIONAL REQUIREMENTS	Ultrasonic Test for Weld Joints Radiography Test for Weld joints NACE ( MR-0175, MR-0103) PTFE, PFA, PVDF ,coating thickness as per requirement Stubs/ Nozzles/ Expanders/ Reducers/ End Fittings can also be also provided Customized special Design Thermowells also can be manufactured.

Special Thermowells.

Van Stone Type

Such Type of Thermowells are used in High Pressure applications, where the presence of any Weld Joints is highly undesirable.

Due to its sturdy and rugged design, these thermowells are highly suited to resist the effects of High Pressure present in the process medium.

These type are machined from a Single Bar Stock, provided with a Collar of suitable thickness, the OD of which corresponds to the RF OD of the Cover or Companion Flange. These thermowells are sandwiched between a Cover Flange and the Nozzle Flange.

Various types of Instrument Connection and Collar OD can be provided as per the requirement.

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Solid Sintered Tungsten Carbide Type

Such Type of Thermowells are used in highly abrasive environments such as Coal Based Power Plants and Air Preheaters etc.

Solid Sintered Tungsten Carbide has got high resistivity to abrasions due to Coal particles, due to which such type of thermowells are highly preferred mostly in Coal Based applications.

Generally the entire Insertion length comprises of Tungsten Carbide. But in cases where insertion length is very long only Bottom Tail Portion is provided with Tungsten Carbide, which would normally come in contact with the abrasive media.

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Sanitary Type Thermowell

These type of Thermowells are generally used to adapt a thermometer or temperature instrument to a Sanitary pipe or tank with a Tri-Clover Clamp connection.

These type of thermowells allows the instruments to be removed for repair, rework or replacement without opening the process connection. These types are specially designed specifically for Food, Dairy and Pharmaceutical Industry.

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Lined or Coated Type

Such type of thermowells are used in chemically active environments. In these type ,a lining or coating, of a suitable Lining material is done, so as to cover the entire Insertion Length .

The Lining material protects the Base material of the thermowell against the corrosive , chemically inert elements present inside the Process medium. Commonly used Lining materials include PTFE, PFA, PVDF. The Thickness of the lining can be provided as per the requirement.

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Sleeved Type

Such type of thermowells are also used in chemically active environments. In these type ,a sleeve of the suitable material is made, so as to cover the wetted portion. The sleeve protects the Base material of the thermowell against the corrosive , chemically inert elements present inside the Process medium. Commonly used Sleeve materials include Hastelloy –C, Nickel, Titanium, Tantalum. The Thickness of the sleeve be provided as per the requirement. Sleeves can only be provided for straight construction.

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