Samson Type 2040 Safety Temperature Monitor for Cryogenic Gas

Samson Type 2040 safety temperature monitor for cryogenic gas lines

The Samson Type 2040 is a self-operated safety temperature monitor (STM) that closes automatically when the medium temperature falls below an adjusted limit. It is designed for cryogenic gases such as argon, nitrogen and oxygen that are stored as liquids and supplied to consumer plants that cannot tolerate extremely cold gas. The datasheet gives limit ranges from –45 to +10 °C, a temperature range from –60 to +60 °C, an operating pressure of up to 40 bar and an oil- and grease-free design. Seven Star LLC supplies the Type 2040 in Oman and the GCC as an independent supplier in Muscat, mainly for industrial gas and air-separation installations.

The device is an unpowered fail-safe element. If the sensor system becomes defective, the valve closes; this behaviour is called out in the datasheet as part of the increased safety of the design. The unit is type-tested, and the datasheet states that an EC type examination according to the Pressure Equipment Directive 2014/68/EU, Module B, has been carried out.

Type 2040 limit range options

The only ordering choices are the limit range and the end connection parts, which is why the type number itself is the sole identifier.

The adjusted limit is the point at which the valve is fully closed. The valve starts to close approximately 17 K above that limit, so the throttling range lies between the limit and the limit plus 17 K. The valve reopens when the medium temperature has risen 2 K above the limit.

Type 2040 technical specifications

How the safety temperature monitor works

The device works on the liquid expansion principle. A temperature-sensitive filling in the integrated sensor expands as the temperature rises and contracts as it falls. The valve is normally open. When a too-cold medium reaches the sensor, the filling contracts, and the positioning spring pushes the tubular plug toward the soft-sealed seat, first throttling and then closing the flow. Because the closing function depends on the sensor temperature, whether it is set by the ambient air or by the process medium, the limit must be adjusted with the ambient temperature at least 25 K above the limit to be set.

Where the Type 2040 fits in a gas system

The STM is placed downstream of an air vaporiser or a pressure regulator, immediately ahead of consumer plant such as carbon steel piping or process equipment that is not designed for cryogenic temperatures. It should not be placed directly next to an air vaporiser, because the cold outdoor air could make it close prematurely. The cryogenic pressure regulators already on this site, such as the Samson Type 2357-1, are the typical neighbours, and the Series 43 temperature regulators cover warmer duty.

Selection checklist for a Type 2040

• Limit temperature required and the limit range that contains it with margin.
• Process medium and whether oxygen cleaning (oil and grease free) is required.
• Maximum operating pressure (40 bar) and differential pressure (25 bar).
• Line size and connection parts: soldering nipple or welding end, DN 15 or DN 25, with conical seal or flat seal.
• Flow demand compared with KVS 5.
• Type-test and PED documentation requested by the project.

Installation, commissioning and maintenance of the 2040

The valve can be mounted in any position, but the flow arrow on the body must match the flow direction. Adjust the limit on site with the limit adjuster, noting the ring marking in 10 °C steps, and after adjustment fit the protective cover. The datasheet warns that an incorrect adjustment is possible if the ambient temperature is too low, so adjust on a warm day or in a warm workshop. Inspect the connections for leaks and, in service, check periodically that the device closes when it is exposed to cold.

Typical applications of the Type 2040 in Oman and the GCC

Liquefied industrial gases are used in oil and gas for inerting and purging, in steel and metal fabrication, in the food and beverage sector and in hospitals. Air-separation units and on-site liquid nitrogen or oxygen tanks need a safeguard to prevent cold liquid or gas from reaching warm-service piping, and a purely mechanical device with no power requirement is attractive in these installations. Heat and sunlight in the Gulf make the 25 K ambient margin for limit adjustment easy to meet.

Information to send with your Type 2040 RFQ

• Gas type and cleaning requirement (for example oxygen).
• Operating pressure and flow range.
• Limit temperature required.
• Pipe size and connection type.
• Documents needed (type test, PED).
• Quantity and delivery site.

Documents and quotation

The Samson data sheet T 2090 for the Type 2040 is attached on this page. Send your duty data and we will confirm availability and lead time. Seven Star LLC is an independent supplier and does not claim any official status with the manufacturer.