Okazaki Protection Tubes for Temperature Sensors — Identification and Replacement Information

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Introduction

Okazaki Manufacturing Company produces protection tubes and thermowells for industrial temperature sensors. These components protect temperature sensors from process conditions including high pressure, corrosion and high temperature. Thermowell configurations can normally be installed independently from the temperature sensor in piping and process systems.

For replacement or new procurement, correct identification requires more than matching the external dimensions. The protection tube construction, material, process connection, insertion dimensions, operating conditions and applicable design requirements should be established before technical compatibility is evaluated.

Okazaki Manufacturing Company promo for protection tubes for temperature sensors, with metal tubes and flanges on a light blue background — Engineers review a selection of Okazaki protection tubes and thermowells for upgrading industrial temperature sensors, showcasing precision in design and manufacturing.

Technical Overview: Okazaki Protection Tubes for Temperature Sensors

Okazaki provides hollowed-out and pipe-type protection tube configurations with screwed, welded and flanged arrangements. Materials, surface treatments and mechanical design vary according to the process environment and installation requirements.

Technical Item	Okazaki Configuration / Description
Product Category	Protection tubes / thermowells for industrial temperature sensors
Primary Function	Protection of temperature sensors against process pressure, corrosion, temperature and other operating conditions
Construction Types	Hollowed-out and pipe-type protection tubes
Basic Models	TW10A, TW10D, TW10E, TW10F, TW20A, TW20B, TW30A and TW40B
Screwed Types	TW10A: hollowed-out screw type; TW10D: screw type with lagging; TW10F: screw type with round head; TW30A: pipe protection tube screw type
Welded Type	TW10E: hollowed-out welding type
Flanged Types	TW20A: hollowed-out flange type; TW20B: assembly-type hollowed-out flange type; TW40B: pipe protection tube flange type
Material Selection	Multiple metallic materials are documented, including stainless steels, heat-resistant alloys and corrosion-resistant alloys
Surface / Protective Treatments	Options documented by Okazaki include PFA coating, ceramic, glass lining, hardfacing, tantalum cover and FEP cover
Strength Evaluation	Strength calculations can be performed according to specified operating conditions and applicable design criteria
Referenced Calculation Standards	ASME PTC 19.3-1974, ASME PTC 19.3 TW-2016 and JSME S 012 are identified by Okazaki for protection-tube strength calculations

Material temperature limits published by the manufacturer are reference values and should not be interpreted independently as guaranteed operating limits. Where mechanical strength is relevant, the complete operating conditions and applicable allowable stress requirements must be evaluated.

Industrial Application

Okazaki documents protection tube configurations for several industrial environments, including petrochemical and gas plants, thermal power plants, high-temperature incinerators, and sanitary installations for food and pharmaceutical processes.

For petrochemical and gas applications, hollowed-out flanged thermowells are commonly used. For thermal power applications such as main steam lines, screwed, welded or welded-shell configurations may be required to address high-pressure, high-temperature and high-velocity steam conditions.

High-temperature applications can require ceramic protection tubes, while sanitary applications may use surface finishing and ferrule-type connections to facilitate cleaning.

The final configuration must therefore be selected according to the actual process and mechanical conditions.

Two engineers in hard hats examine industrial probes and cables on a steel table in a bright factory, discussing equipment. — Engineers examine Okazaki RESIOPAK mineral insulated resistance thermometer sensors with sheathed probes and lead-wire configurations to ensure precision in industrial temperature measurement.

Identification / Replacement Considerations

When evaluating an existing Okazaki protection tube or thermowell for replacement, the complete installed configuration should be identified.

Priority information includes:

Manufacturer and exact model / model code
Protection tube / thermowell construction
Existing nameplate or identification markings
Copy of the original drawing, when available
Protection tube material
Surface treatment or protective covering, when applicable
Outside diameter and bore dimensions
Insertion length and overall dimensions
Process connection — screwed, welded, flanged or other specified arrangement
Flange specification, when applicable
Temperature sensor interface
Process fluid
Operating and design temperature
Operating and design pressure
Flow conditions, when relevant
Applicable design standard or strength-calculation requirement
Quantity

A thermowell with similar external dimensions should not automatically be considered interchangeable. Material, wall thickness, insertion geometry, process connection and process conditions can affect mechanical suitability and sensor compatibility.

Information Recommended for Quotation

For an Okazaki protection tube or thermowell RFQ, provide the complete model code and copy of the original drawing whenever available.

If the exact model cannot be confirmed, provide photographs of the existing unit together with its material, dimensions, process connection, flange or thread specification, sensor interface, process fluid, design pressure, design temperature, operating conditions and quantity.

For installations where thermowell mechanical integrity must be evaluated, provide the relevant process and flow conditions required for the applicable strength calculation.

For structured preliminary model identification, use the:

Okazaki Model Code Generation Apphttps://www.nichiboku-mkt.com/okazaki-model-code-identifier/

The application can be used to organize available technical information before submitting an RFQ. Final product identification and quotation feasibility remain subject to technical review.

Nichiboku Support

Nichiboku supports international sourcing and supply of identifiable Japanese industrial equipment and instrumentation, including Okazaki temperature sensors, protection tubes and thermowells.

For replacement requirements, technical evaluation is based on the available information for the existing equipment and actual process conditions. Providing the exact model code, copy of the original drawing, dimensions, material and operating conditions helps reduce identification uncertainty and supports a technically qualified RFQ.

Okazaki Manufacturing — Nichiboku Techhttps://www.nichiboku.com/japanese-industrial-products/okazaki-manufacturing

For replacement or procurement evaluation, provide the manufacturer, exact model number or model code, copy of the original drawing or nameplate, technical specifications, quantity and required quotation deadline.