Thermowell
Thermowell
The ped lock valves Thermowells are utilized when pressure, high velocity, and corrosive process media exist. This serves to isolate and protect the sensing instrument, and permits the removal of a sensing instrument without shutting down the process. A perfect solution for protecting the process and extending product service life.
Thermowell is a closed-end re-entrant tube designed for the insertion of a temperature-sensing element and provided with means for a pressure-tight attachment to a vessel. These are typically constructed of solid drilled-out bar stock and are designed to protect a temperature sensor from flow, high pressure, and harsh environments. Thermowells encase and protect temperature sensors from the harmful effects of the processes into which they are immersed without substantially insulating the temperature sensor (thermocouple, RTD, etc.) from the temperature of the process.
| Design | Square Body |
|---|---|
| Rating | Up to 10,000 psi @ 14°F to 176°F |
| Connection | BSP, NPT, & BSPT (Male-Female) |
| Gland Packing | PTFE |
| Size | 1/2” & 3/4” |
| Connections | Screwed |
| Body Stock | Bar Stock & Forged Steel |
| Material | SS, CS, and other Materials on Request |
PED-LOCK Thermowell process connections
Thermowells are inserted into and connected into a process in a pressure tight manner. The most common process connections for thermowells include threaded, socket weld, and flanged connections.
PED-LOCK Thermowell shank construction
The most common shank constructions for thermowells are (1) straight, (2) step, and (3) tapered. A straight shank Thermowell is the same size all along the immersion length of the Thermowell. A step shank Thermowell has an outer diameter of at the end of the thermowell immersion length to provide a quicker response time. In a tapered Thermowell the outside diameter of the Thermowell decreases gradually along the immersion length of the Thermowell. A heavy duty tapered thermowell is typically used for high velocity applications due to the specification of a tapered thermowell shank in the old ASME PTC 19.3 (1974) thermowell standard. However, where the nozzle inside diameter is a design constraint the straight shank thermowell design is often the most resistant to velocity induced resonance.