Common use of Temperature Instruments Clause in Contracts

Temperature Instruments. Temperature elements and dial thermometers shall be protected by thermowells except when measuring gas or air temperatures at atmospheric pressure. Temperature test points shall be equipped with thermowells fitted with caps or plugs. Dial thermometers shall have 5-inch diameter (minimum) dials and white faces with black scale markings and be every-angle type and bimetal actuated. Dial thermometers shall generally be visible 10 feet from an operator's normal stance at floor level (viewing area) and be resistant to Facility atmospheres. If a thermocouple is inaccessible, the leads shall be brought to an accessible junction box. Thermocouples (if used) shall be dual-element, ungrounded, spring-loaded, Chromel-Constantan (ANSI Type E) or Chromel-Alumel (ANSI Type K) for general service. Thermocouples general application shall normally be magnesium-oxide insulated sheathed type. Thermocouple shall be constructed with a 316SS sheath of 0.25-inch diameter. Thermoelectric properties, temperature limits, and limits of error of thermocouples and thermocouple extension wires shall conform to ANSI Standard MC 96.1. Identification of thermocouples shall be by a wired-on metal tag indicating the code or tag number. Thermocouple heads shall be the cast aluminum type with an internal grounding screw. Conduit connection shall be 0.75-inch. Connection to the thermocouple assembly shall be 0.5-inch NPT. In general, temperature instruments shall have scales with temperature units in degrees Fahrenheit. Exceptions to this are electrical machinery resistance temperature detec­tors (RTDs) and transformer winding temperatures, which are in degrees Celsius. RTDs shall be either 100-ohm platinum type or 10-ohm, copper, three-wire circuits (R100/R0‑1.385), and ungrounded. The element shall be spring-loaded, mounted in a thermowell, and connected to a cast aluminum head assembly. Where ASME Performance Test Codes (e.g., PTC-6 Steam Turbines) are applicable to power cycle piping, they shall be used as the criteria for determining well lengths. Thermal-filled system instruments shall be gas or liquid filled stainless steel capillary type. Material shall be a minimum of ANSI Type 304 stainless steel machined from bar stock in a tapered configuration. Other materials may be specified as required by the piping specifications. The alloy used shall meet the process metallurgical requirements. The temperature process connections shall be 1-inch NPT where screwed connections are allowed by the piping classification. Where flanged connections are required by the piping classification, they shall be designed to mate against a 1.5-inch raised face or ring joint flange in accordance with the piping specifications. Weld in thermowells shall be at least 1-inch diameter. Special protecting tubes for high temperature applications of chrome iron, incoloy, or other special materials shall be used as required by the temperature and the process materials. Thermowells in combining streams shall be a minimum of 10 pipe diameters downstream of the junction for liquid services and 30 pipe diameters for vapor services. Brass plug and chain shall be provided with all test ▇▇▇▇▇. Thermowells shall be designed to avoid root stress failure due to vibrations induced by wake vortices. Where the standard thermowell is designed to withstand the maximum fluid velocity permitted in the piping design standards, individual wake frequency calculators are not required. Dials of 3-inch diameter may be used in mechanical equipment lube and seal oil service or other auxiliary service. Installation of thermocouples, thermowells, test ▇▇▇▇▇, and thermometers shall be in accordance with utility and good engineering practice unless otherwise specified.

Temperature Instruments. Temperature elements and dial thermometers shall will be protected by thermowells except when measuring gas or air temperatures at atmospheric pressure. Temperature test points shall will be equipped with thermowells fitted with caps or plugs. Dial thermometers shall will have 5-5 inch diameter (minimum) dials and white faces with black scale markings and will be every-angle type and bimetal actuated. Dial thermometers shall ther­mometers will generally be visible 10 feet from an operator's normal stance at floor level (viewing area) and will be resistant to Facility atmospheres. If a thermocouple is inaccessible, the leads shall will be brought to an accessible junction box. Thermocouples (if used) shall will be dual-element, ungrounded, spring-loaded, Chromel-Constantan (ANSI Type E) or Chromel-Alumel (ANSI Type K) for general service. Thermocouples general application shall normally be magnesium-oxide insulated sheathed type. Thermocouple shall be constructed with a 316SS sheath of 0.251/4-inch diameter. Thermoelectric propertiesProperties, temperature limits, and limits of error of thermocouples and thermocouple extension wires shall conform to ANSI Standard MC 96.1. Identification of thermocouples shall be by a wired-on metal tag indicating the code or tag number. Thermocouple heads shall will be the cast aluminum type with an internal grounding screw. Conduit connection shall be 0.75-¾ inch. Connection to the thermocouple assembly shall be 0.5-½ inch NPT. In general, temperature instruments shall will have scales with temperature units in degrees Fahrenheit. Exceptions to this are electrical machinery resistance temperature detec­tors (RTDsRTD’s) and transformer winding temperatures, which are in degrees Celsius. RTDs shall RTD’s will be either 100-100 ohm platinum type or 10-10 ohm, copper, three-wire circuits (R100/R0‑1.385), and ungrounded. The element shall will be spring-spring loaded, mounted in a thermowell, and connected to a cast aluminum head assembly. Where ASME Performance Test Codes (e.g., PTC-6 Steam Turbines) are applicable to power cycle piping, they shall will be used as the criteria for determining well lengths. Thermal-Thermal filled system instruments Instruments shall be gas or liquid filled stainless steel capillary type. Material shall be a minimum of ANSI Type 304 stainless steel machined from bar stock in a tapered configuration. Other materials may be specified as required by the piping specifications. The alloy used shall meet the process metallurgical requirements. The temperature process connections shall be 1-1 inch NPT where screwed connections are allowed by the piping classification. Where flanged connections are required by the piping classification, they shall will be designed to mate against a 1.51-1/2-inch raised face or ring joint flange in accordance with the piping specifications. Weld in thermowells shall be at least 1-1 inch diameter. Special protecting tubes for high temperature applications of chrome iron, incoloy, or other special materials shall be used as required by the temperature and the process materials. Thermowells in combining streams shall be a minimum of 10 pipe diameters downstream of the junction for liquid services and 30 pipe diameters for vapor services. Brass plug and chain shall be provided with all test ▇▇▇▇▇. Thermowells shall be designed to avoid root stress failure due to vibrations induced by wake vortices. Where the standard thermowell is designed to withstand the maximum fluid velocity permitted in the piping design standards, individual wake frequency calculators are not required. Dials of 3-inch diameter may be used in mechanical equipment lube and seal oil service or other auxiliary service. Installation of thermocouples, thermowells, test ▇▇▇▇▇, and thermometers shall be in accordance with utility Utility and good engineering practice unless otherwise specified.