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Brand: Endress+Hauser (E & H)
Endress+Hauser TT152 iTHERM Barstock Thermowell (ASME)
Description
TT152 imperial barstock thermowell: scope and design basis
The Endress+Hauser TT152 is the imperial-dimension barstock thermowell in the iTHERM ModuLine range. It is machined from solid bar, built on the ASME B40.9 standard, and dimensioned in inches: root diameters run from 5/8 to 1 1/2 in, and the immersion length of a straight or tapered unit can run from 1 in up to 84 in. The datasheet gives a pressure range up to 500 bar (7 252 psi) and a maximum process temperature range of –200 to +1 100 °C, with the real limit set by the material and connection.
The TT152 is the version to look at when your plant is built to American piping practice: NPT threads, ANSI flanges, NPS socket-weld and weld-in sizes, and ASTM forged materials such as A105 and A182 chrome-moly grades. Seven Star LLC supplies the TT152 in Oman and the GCC as an independent supplier in Muscat, and the exact build is set from your process and piping data.
TT152 technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Endress+Hauser / TT152 (iTHERM ModuLine barstock thermowell, imperial) |
| Design basis | ASME B40.9 based, with a wider choice of threads, flanges and materials than the standard lists |
| Process temperature | –200 to +1 100 °C (–328 to +2 012 °F), depending on type and material |
| Process pressure | Up to 500 bar (7 252 psi); weld-in ≤ 500 bar, threads 400 bar at 400 °C, flanges per ANSI class |
| Root diameter | 5/8 to 1 1/2 in (15.88 to 38.1 mm) |
| Immersion length U | 1 to 84 in (25.4 to 2 133.6 mm), straight and tapered; 3 to 12 in for stepped shanks |
| Bore diameter | 0.26 in (6.6 mm) standard, 0.385 in (9.78 mm) optional |
| Bottom thickness | 0.25 in (6.35 mm) default |
| Surface finish | Ra 1.6 µm default, 0.76 µm optional |
| Thermometer connection | Female 1/2 NPT |
| Weight | 0.5 to 37 kg for standard options |
How the TT152 is built: shanks, connections and variants
The TT152 comes in straight-shank, tapered-shank and step-shank forms. The straight shank is the simplest; the tapered shank is thick at the root and thin at the tip, which gives a stiffer stem with a faster response; the step-shank has a short reduced section at the tip (stepped length from 0.25 to 16 in) and is the classic design for fast-response with a stiff upper part. Weld-in thermowells with a tapered shank and socket-weld thermowells are offered in the NPS sizes 3/4, 1, 1 1/4 and 1 1/2 in, plus a hygienic 1 3/8 in size.
Process connection options are a threaded (NPT 1/2, 3/4, 1, 1 1/4, 1 1/2 in or G 1/2 and G 3/4) body, a flanged body (ANSI 1 in from Class 150 to 600; 1 1/2 and 2 in from Class 150 up to 900/1500; 3 in from Class 150 to 600), or a weld-in/socket-weld stem. A flanged thermowell can be welded on both sides or with full-penetration welding for harsh service, and flanged versions can also be fitted with a PTFE coating or a tantalum sleeve for corrosive media.
iTHERM TwistWell version of the TT152
For high-velocity gas or steam, the TT152 can be ordered as an iTHERM TwistWell: a barstock stem with a patented helical profile that reduces vortex-induced vibration. In the TT152 range this variant is offered with ANSI 1, 1 1/2 and 2 in flanges from Class 150 up to 900/1500, in 316/316L, with three coils. The datasheet lists three coil-diameter options (30, 25 and 22 mm), and immersion length U runs from 1 to 24 in. The helix must lie within the flow area, so the coil length is factory-set from the tip to the beginning of the nozzle.
Choosing TT152 materials
The datasheet lists 316/316L, 304/304L, Alloy 600, Alloy C276, A182 F11, F22 and F91, A105 and duplex S32205 for threaded and socket-weld bodies, with flanged bodies offered in 316/316L, 304/304L, Alloy C276, Alloy 600 and A105, and the PTFE-coated and tantalum-sleeved variants on a 316/316L base. As a rule, the chrome-moly grades (F11, F22, F91) are for steam and hot service where the thermowell must match the line metallurgy, 316/316L is the general-purpose option, and Alloy C276 or the sleeve/coating variants are for corrosive media.
| Material | Max. continuous temperature in air | Notes |
|---|---|---|
| 316/316L | 650 °C | General-purpose, good corrosion resistance |
| Alloy 600 | 1 100 °C | Hot oxidising and reducing atmospheres; avoid sulphur |
| A182 F22 | 580 °C | Heat-resistant alloy steel for steam boilers |
| A182 F91 | 650 °C | High-temperature martensitic steel |
| Duplex S32205 | 300 °C | High strength, good chloride resistance |
| PTFE coating | 200 °C | Chemical resistance, low pressure |
| Tantalum sleeve | 250 °C | Excellent acid resistance except hydrofluoric |
The temperatures are reference values for air under light load, according to the datasheet, and are reduced in aggressive media or under high mechanical load.
Selecting and ordering a TT152
- Existing point: note the thermowell dimensions and stamped data, especially U, root diameter, flange class and material.
- Connection: NPT or G thread, socket weld, weld-in or an ANSI flange with the correct facing.
- Shank: straight, tapered or step, with TwistWell for vibration-prone lines.
- Insert compatibility: a 1/2 NPT female head thread and a bore of 6.6 or 9.78 mm determine the insert you can fit.
- Wake-frequency check: run the manufacturer sizing tool with real flow, density and temperature.
- Welds: choose welded on both sides or full penetration for flanged units; state the inspection level.
Installation and service notes for the TT152
Install in any orientation, with self-draining where needed. A thread-in version must have the correct sealing compound for the service temperature, while a weld-in unit needs an agreed welding procedure and, for pressure piping, any required inspection. Do not exceed the lowest rating among the thread, flange, weld and material at the real temperature.
Include the thermowell in your inspection list. Fatigue cracks start at the root, so after any known vibration event, high-velocity trip or upset, a liquid-penetrant or visual check is good practice. If you carry spares, stock the same material and length as the installed unit, since the length determines insert fit.
TT152 applications in Oman and the GCC
American-style piping is common across oil and gas facilities in Oman and the Gulf, which is where the TT152 fits most naturally: wellhead and gathering lines, compressor discharge, fired-heater outlets, steam headers in power and utilities plants, and process lines in petrochemical and refining units. Desalination plants also use ANSI-rated points on high-pressure brine and steam. Outdoor sun, dust and humid air do not affect the thermowell itself, but they do affect the head and cable entries, so specify these with the thermowell.
TT152 compared with TT131 and TT151
The TT131 is a welded tube thermowell, metric, up to 100 bar. The TT151 is the metric barstock version for DIN, NAMUR, ASME-based and universal forms. The TT152 is for inch-based barstock work, up to 500 bar, with ANSI connections. If you are replacing an existing American-standard thermowell, TT152 is generally the match; if the point is DIN or metric, ask for the TT151.
Information to send with a TT152 RFQ
- TT152 and any existing tag, drawing or order code
- Process medium, temperature, pressure, velocity
- Shank type, immersion length U, root and tip diameter, bore
- Thread or ANSI flange size and class, or NPS weld-in size
- Stem and flange material, plus PTFE or tantalum options if needed
- Standard of inspection and certificates required
- Quantity and delivery site
Documents and quotation
A datasheet for the TT152 is attached on this page. It holds the dimension ranges, the connection tables and the material limits referred to above.
Send the TT152 part number and your data to Seven Star LLC for a quotation. We will confirm the configuration, lead time and the documents available with your order.
Other Models in the Itherm Modluine Thermowell Range
Seven Star LLC supplies models from the Itherm Modluine Thermowell range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| Endress+Hauser TT131 iTHERM Welded Thermowell | Temperature Instrumentation | View details |
| Endress+Hauser TT151 iTHERM Barstock Thermowell | Temperature Instrumentation | View details |
| Endress+Hauser TT152 iTHERM Barstock Thermowell (ASME) | Temperature Instrumentation | You are viewing this model |
Datasheets & Documents
- Datasheet Endress+Hauser TT152 Datasheet Download
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About brand
Endress+Hauser makes process measurement instruments for flow, level, pressure, temperature and liquid analysis. Georg H. Endress and Ludwig Hauser started the business in Lörrach, Germany, on 1 February 1953, first selling level meters, and the Endress+Hauser name has been used since 1957. The group is headquartered in Reinach, Switzerland, and has been wholly owned by the Endress family since 1975.
Seven Star LLC is an independent supplier listing Endress+Hauser flowmeters, level and pressure transmitters, temperature assemblies and liquid analysis products for buyers in Oman and the GCC. Instruments are matched from the full order code on the nameplate.
Endress+Hauser company profile
| Origin | Founded in Lörrach, Germany, on 1 February 1953 by the Swiss engineer Georg H. Endress and Ludwig Hauser |
|---|---|
| Headquarters | Endress+Hauser AG, Reinach (Basel-Landschaft), Switzerland |
| Ownership | Family owned; the Endress family has been the sole shareholder since 1975, and a family charter commits the company to stay family owned |
| Size | About 16,500 employees and sales of about EUR 3.7 billion (2023, as reported by the company) |
| Product families | Proline flowmeters, Micropilot and Levelflex radar, Liquiphant switches, Cerabar and Deltabar pressure, iTEMP and iTHERM temperature, Liquiline and Memosens liquid analysis |
Milestones
- 1953: Georg H. Endress and Ludwig Hauser start the business in Lörrach on 1 February, first selling level meters.
- 1957: The Endress+Hauser name comes into use.
- 1975: The Endress family becomes sole shareholder.
- 2023: About 16,500 employees and sales of about EUR 3.7 billion, as reported by the company.
Endress+Hauser product lines
| Line | Measuring principle | Typical use |
|---|---|---|
| Promass F 300, Promass 80F, 83F/84F | Coriolis mass flow | Direct mass flow and density of liquids and gases, hydrocarbon transfer and chemical dosing |
| Promag P 300, P 500, H 300, W 400, W 10, 50P | Electromagnetic flow | Water, wastewater, slurries and other conductive liquids |
| Prowirl F 200, 72F | Vortex flow | Steam, gas and low-viscosity liquids |
| Prosonic Flow 92F, t-mass 65F | Ultrasonic and thermal mass flow | Water lines; compressed air and industrial gases |
| Micropilot FMR62, FMR67, FMR60, FMR10B, FMR20, FMR50, FMR52 | Free-space radar level, 80 GHz and 26 GHz | Tanks, process vessels, silos and open water channels |
| Levelflex FMP51, FMP50, FMP54, FMP55 | Guided wave radar level | Level and interface in vessels, separators and bypass chambers |
| Liquiphant FTL51, Prosonic S FMU90 | Vibronic point level; ultrasonic level | High and low level alarms, pump protection, open channel flow |
| Cerabar PMC71B, PMP51B, PMP71, Deltabar PMD78B, PMD75 | Pressure and differential pressure | Process pressure, hydrostatic level and DP flow |
| iTEMP TMT82, TMT162, iTHERM TM101, TR66, TR10 | Temperature transmitters and thermometers | RTD and thermocouple points with thermowells |
| Liquiline CM444, CM442, Memosens CPS11E, Stamolys reagents | Liquid analysis | pH, ORP, conductivity, dissolved oxygen and nutrient analysis in water treatment and process |
Where Endress+Hauser instruments are used
In Oman and the GCC, Endress+Hauser instruments are common in oil and gas production and processing, refineries and petrochemicals, desalination and water networks, wastewater treatment, power plants and food and beverage plants. Coriolis meters measure hydrocarbon and chemical flows, electromagnetic meters cover water and wastewater, radar transmitters handle tank and silo level, and Liquiline analysers monitor water quality. Proline 300 and 500 flowmeters include Heartbeat Technology for in-situ verification, which reduces the need to remove a meter for checks.
Ordering Endress+Hauser instruments: what we need
The order code on the nameplate (for example PMP71-1QA1S11RDADU) defines every option: measuring range, process connection, materials, output, approvals and display. Send it with the serial number; Endress+Hauser can retrieve the original configuration from the serial number. For a new instrument add the medium, operating and design pressure and temperature, range, line size or tank geometry, process connection, wetted materials, output or protocol (4-20 mA HART, PROFIBUS, FOUNDATION Fieldbus, Modbus) and the hazardous-area approval required. Older models such as Promass 80/83 or Micropilot M are replaced by current Proline or 80 GHz Micropilot devices.
Facts checked against Endress+Hauser company history and product information, October 2026.
Browse Endress+Hauser products by category: Flowmeters, Level Transmitter, Pressure Instrumentation, Temperature, Liquid Analysis Sensors, Liquid Analytical Systems.
FAQ
Questions about the Endress+Hauser TT152 iTHERM Barstock Thermowell
Answers from our engineering team on installation, compatibility and integration.
01What is the Endress+Hauser TT152?
It is an imperial barstock thermowell from the iTHERM ModuLine range, based on ASME B40.9. It is intended for pipes, vessels and tanks where US-style threads, flanges and materials are used.
02What sizes does the TT152 cover?
Root diameters run from 5/8 to 1 1/2 in, and immersion lengths from 1 to 84 in for straight and tapered shanks. Step-shank units are offered at 3 to 12 in immersion.
03Which connections are available on a TT152?
Threaded NPT or G bodies, ANSI flanges from Class 150 up to 900/1500 depending on size, and NPS socket-weld or weld-in stems. Flanged units can also have a PTFE coating or tantalum sleeve.
04Is the TT152 available with a vibration-reducing shaft?
Yes, an iTHERM TwistWell version with a helical profile is described in the datasheet for high flow rates. It is offered in 316/316L with ANSI flanges.
05How does the TT152 differ from the TT151?
Both are barstock thermowells for up to 500 bar. The TT152 is dimensioned in inches to ASME B40.9, while the TT151 is metric and also offers DIN and NAMUR designs.
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