Liquid pumps and pumps units. Noise test code. Grades 2 and 3 of accuracy PAS 15 A metallic screening layer of

A metallic screening layer of copper wire or copper tape and/or a metallic armour of aluminium or galvanized steel wire

other plastics and non-plastics materials intended to be used for the following:

Figure 1 — Basic form of Unified insert assembly

3 was corrected to EN 1991-1-4:2005

and erosion resistance

Liquid pumps and pumps units. Noise test code. Grades 2 and 3 of accuracy PAS 15 A metallic screening layer of1 Scope This document specifies all the information necessary to carry out efficiently and under standardized conditions the determination, declaration, and verification of the airborne noise emission of liquid pumps or pump units (see 4. 1). It specifies the noise measurement methods and the operating and mounting conditions that shall be used for the test. Noise emission characteristics include emission sound pressure levels at specified positions