API STD 670:2000 pdf download

API STD 670:2000 pdf download.Machinery Protection systems.
2. Aeroderivative gas turbines typically require special high-temperature transducer Systems that exceed the operating range specified in Table 1, and monitor systems with special filtering based on original equipment manufacturer recommendations. Consult the machinery protection system vendor.
3. Radial vibration or position measurements using proximity probe transducers on shaft diameters as small as 76 mm (3 in.) do not introduce appreciable error compared to measurements made on a flat target area. Shaft diameters smaller than this can be accommodated but generally result in a change in transducer scale factor. Consult the machinery protection system vendor.
4. Proximity probe measurements on shaft diameters smaller than 50 mm (2 in.) may require close spacing of radial vibration or axial position transducers with the potential for their electromagnetic emitted fields to interact with one another (cross-talk) resulting in erroneous readings. Care should be taken to maintain minimum separation of transducer tips. generally at least 40 mm (1.6 in.) for axial position measurements and 74 mm (2.9 in.) for radial vibration measurements.
4.5.3 The proximity probe transducer system accuracy shall be verified on the actual probe target area or on a target with the same electrical characteristics as those of the actual probe target area (see Figure 4).
4.5.4 When verifying the accuracy of any individual component of the proximity probe transducer system in the operating range, the components not under test shall be maintained within the testing range.
4.6 INTERCHANGEABILITY
4.6.1 All components covered by this standard shall be physically and electrically interchangeable within the accuracy specified in Table 1. This does not imply that interchangeability of components from different machinery protection system vendors is required, or that oscillator- demodulators calibrated for different shaft materials are electrically interchangeable.
4.6.2 Unless otherwise specified. probes, cables, and oscillator-demodulators shall be supplied calibrated to the machinery protection system vendor’s standard reference target of AISI Standard Type 4140 steel.
Note: Consult the machinery protection system vendor for a precision factory target when verifying the accuracy of the transducer system to this standard. The machinery protection system vendor should be consulted for applications using target materials other than AISI Standard Type 4140 steel as they may require factory re-calibration of the transducer system.
4.7 SCOPE OF SUPPLY AND RESPONSIBILITY
4.7.1 For each train, the purchaser shall specify the agency or agencies responsible for each function of the design, scope of supply, installation, and performance of the monitoring system (see Appendix B).
4.7.2 The details of systems or components outside the scope of this standard shall he mutually agreed upon by the purchaser and machinery protection system vendor.
5.1.1 Proximity Probes
5.1.1.1 A proximity probe consists of a tip, a probe body, an integral coaxial cable, and a connector as specified in 5.1.3, and shall be chemically resistant as specified in 4.4. This assembly is illustrated in Figure 5.
5.1.1 .2 Unless otherwise specified. the standard probe shall have a tip diameter of 7.6 to 8.3 millimeters (0.300 to 0.327 in.). with a reverse mount. integral hex nut probe body approximately 25 millimeters (1 in.) in length and I8-24- UNF-2A threads.
Notes:
1. Reverse mount probes are intended for use with probe holders allowing external access to the probe and its integral cable. The use of a reverse mount probe as the standard probe allows a single probe configuration and thread length to be used throughout the entire machine train. The length of the probe holder stem will typically vary from one probe mounting location to the next, but this can be trimmed in the field without the need to employ different probes.
2. Piston rod drop applications do no generally enable reverse mount probes to be used. A sandard option forward mount probe should be selected instead.
• 5.1.1.3 When specified, the standard options may consist of one or more of the following forward mount probe configurations (see Figure 6):
a. A tip diameter of 7.6 to 8.3 millimeters (0.300 to 0.327 in.)
and 3/8-24-UNF-2A English threads.
b. A tip diameter of 4.8 (05.3 millimeters (0.190 to 0.208 in.)