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API STD 670:2000R2010 pdf download

API STD 670:2000R2010 pdf download.Machinery Protection Systems.
5.2.1 Casing Vibration Transducers Piezoelectrlc Accelerometers The standard accelerometer sysem shall be an electrically isolated transducer consisting of a case, a piezoelectric crystal, an integral amplifier, and a connector. The accelerometer case shall be constructed from AISI Standard Type 316 or other equivalent corrosion reds- (ant stainless steel, and shall be electrically isolated from the pietoelectnc crystal and all internal circuitry. The case shall be hermetically sealed. The case shall have a maximum outside diameter of 25 millimeters (I in.). The overall case height shall not exceed 65 millinwlers (2.5 mi, not including the connector. The accelerometer case shall be tilted with standard wrench flats. The mounting surface of the accelerometer case shall he finished to a maximum roughness of 0.4 micrometers (16 micminches) Ra (arithmetic average roughness) The center of this mounting surface shall be drilled and tapped (perpendicularto the mounting surface ±5 minutes of an arc) with a /4-28 UNF-2A threaded hole of 6 millimeters (14 in.) minimum depth. The vendor shall supply with each accelerometer a standard mounting option consisting of a double-ended, flanged. /4-2l4 UNF.2A threaded. AlSl Standard Type 300 stainless steel mounting stud. The stud shall not prevent the base of the accelerometer from making flush contact with its mounting (see Appendix C). The standard accelerometer shall have a top connector capable of withstanding the operating cnv ironnicnt When specified. accelerometer standard options may consist of one or more of the following (see Append ix C):
a. Integral stud for non-flush mounting (see Appendix C).
b. Mounting stud: U.S. Customary threads other than /4-28
c. Mounting stud: metric threads.
d. Integral accelerometer cable. The accelerometer transverse sensitivity shall not exceed 5% of the principal axis sensitivity over the ranges specified in Table I. The accelerometer transducer shall have a noise floor no higher than 0.(X)4 g mis over the frequency range specified in Table I. Accelerometer Cables Accelerometer cables shall be supplied by the machinery protection system vendor. They shall beet the temperature requirements of the accelerometer. Connectors
The attached connector or connectors shall meet the mechanical, electrical, and environmental requirements of the accelerometer. The body material shall be AISI Standard 1pe 300 stainless steel. The accelerometer cable and connector assembly shall be designed to withstand a minimum tensile load of 225 newtons (50 pounds).
5.3.1 Sensors
• The standard temperature sensor shall be a 100- ohm, platinum, three-lead resistance temperature detector with a temperature coefficient of resistance equal to 0.00385 ohrnohrnl°C from OC to l00°C (32°F to 212F). When specified, the standard optional temperature sensor shall be a grounded. TSpe i iron-copper-nickel for example. Constantan) thermocouple manufactured in accordance with ANSI MC96.l (IEC 584-1). Temperature sensors for electhcally insulated bearings shall maintain the integrity of the bearing insulation (see Note).
• Sensor leads shall be coated, both individually and overall, with insulation, When specified, flexible stainless steel overbraiding (see note) shall cover the leads and shall extend from within 25 millimeters (I in.) of the tip to within 100 millimeters (4 in.) of the flrs* connection.
Note: Stainless steel overhrakhng may he difikuli to seal in some installations, A 40-millimeter (1.5 in.) piece of clear heat-shrink tubing (not to be shrunk at the factory) shall be installed at the connection end to assist in the tagging of the sensor.
5.3.2 Wiring
Wiring from the temperature scnsor to the monitor shall be as follows:
a. For resistance temperature detectors (RTDs). use three- conductor shielded wire in accordance with Appendix D.
h. For thennocouples, use thermocouple extension wire of the same material as the thermocouple and in accordance with Appendix 1).
5.3.3 Connectors
The standard installation shall employ a single compression-type, like-metal-to-like-metal connection technique between the sensor and the monitor.


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