Temperature Instruments Clause Samples
The 'Temperature Instruments' clause defines the requirements and standards for devices used to measure temperature within a specific context, such as a facility, process, or system. It typically outlines the types of instruments permitted, their calibration procedures, and maintenance schedules to ensure accurate readings. By establishing clear expectations for temperature measurement, this clause helps maintain safety, quality control, and regulatory compliance in operations where temperature is a critical parameter.
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 th...
Temperature Instruments. The Supplier shall provide temperature instruments in the Gasification Trains.
Temperature Instruments. The Purchaser shall provide and be responsible for all temperature instruments other than those used in the Gasification Trains. OUTPUT FLUE GASES The Purchaser shall treat all flue gases prior to their release to atmosphere. The Purchaser shall provide a properly sized stack to regulate the flow of flue gases to atmosphere. The Purchaser will provide the waste heat recovery package to generate steam or superheated steam.
Temperature Instruments. The method of temperature measurement to be employed shall be selected for the particular application bearing in mind requirements for accuracy and reliability. The primary elements for temperature service shall consist of thermocouples or resistance temperature detectors (RTD), depending upon the service applications. All thermocouples are to be non-grounded and duplex. The temperature sensors shall be accurate within ±0.4 percent of full scale or better. Local temperature indicators shall be provided upstream and downstream of each piece of equipment that can affect process temperature (i.e. heat exchangers, coolers, etc.). Local temperature indicators shall be bimetal type with adjustable angle head, 5-inch dials with plastic windows, hermetically sealed, and of stainless steel construction. Dial scales shall be white with black graduations and pointer, and shall have the normal operating range in the middle third of the dial range. The accuracy of local temperature indicators shall be ±1.0 percent of full scale or better. Local temperature indicators shall be mounted in thermowells. Quality measuring instruments monitoring chemical or physical properties of process fluids and substances may be installed either directly in the process line or vessel or at a distance and connected by means of sampling systems. Analytical instruments shall be selected to operate continuously, infrequently or on a continuously interrupted cycle as most suited to the measurement and the intended application. If sampling systems are employed then they will be designed such that the sample cannot be contaminated and time lags between the sampling point and the analyzer are insignificant. Sensors shall be of rugged construction and shall not require frequent maintenance or recalibration. Where sensors require the use of calibration solutions or gases, then a minimum of one year supply at normal usage shall be supplied. Where sensors require replacement or removal for recalibration or rejuvenation at regular intervals, then an adequate number of spare sensors shall be supplied for one year’s normal usage.