ASME PTC 24

Abstract

OBJECT AND SCOPE <br> This Code provides standard directions and rules for the conducting and reporting of tests on single or multi-stage ejector units. <br> The primary object of the test measurements described herein is to establish: <br> (a) Ejector capacity in relation to suction pressure <br> (b) Discharge pressure in relation to suction pressure <br> (c) The flow rate of the motive fluid in relation to a stipulated pressure and temperature <br> (d) The ejector stability; i.e. the relation of motive fluid pressure or the discharge pressure to breakdown and recovery of the pumping action <br> The Code rules and procedures are intended primarily for the test of ejectors in which the motive fluid is steam. They may be used, however, with any motive fluid for which the physical properties are completely and reliably known. See Section 3, Par. 3.01. <br> The instructions and capacity measurements provide for tests where the suction fluid pumped is air, water vapor, or other gases for which the physical and thermodynamic properties are known. A procedure is provided for tests on gas mixtures in which the components can be separately measured and controlled. <br> If the motive fluid is steam or other condensable vapor, it shall be dry (without any moisture). The Code does not cover two-phase fluids. <br> This Code is limited to ejectors having suction pressures that permit accurate measurement by the instrumentation and technique available. <br> Rules are given for adjusting test results to design conditions. (See Section 3 on Guiding Principles.) <br> This Code does not consider an overall tolerance or margin which may, by agreement, be made applicable to any specific performance. Allowances for inaccuracy of measurements may be recognized as provided in Section 3, Par. 3.10. <br> The procedures and instrument specifications of Section 4, the formulae and methods for computing results of Section 5 , and the indicated form of reporting the test of Section 6, are mandatory. For reasons of expediency or otherwise, the parties to a code test may, by agreement, substitute other instruments or methods. However, only tests made in strict accordance with the mandatory provision of this Code may be designated as complying with the ASME Test Code for Ejectors.