Specification

ASME A112.18.1-2018/CSA B125.1-18 Plumbing supply fittings
July 2018 © 2018 Canadian Standards Association
56
5.12.2.2.2
The minimum flow rate for the manufacturer’s specified mode or modes shall be determined through
testing and shall be not less than
a) 60%
of the maximum flow rate specified in Clause 5.12.2.1 when tested at a flowing pressure
of
140
± 7 kPa (20 ± 1 psi); and
b) 75%
of the maximum flow rate specified in Clause 5.12.2.1 when tested at flowing pressures
of
310
± 7 kPa (45 ± 1 psi) and 550 ± 7 kPa (80 ± 1 psi).
5.12.3 Spray force
5.12.3.1 Performance requirement
When tested in accordance with Clause 5.12.3.2, the minimum spray force for
a) high-efficiency showerheads and hand-held showers shall be not less than 0.56 N (2.0 ozf) at a
flowing pressure of 140 ± 7 kPa (20 ± 1 psi) at the inlet. The specimen shall be deemed to exceed
the minimum spray force requirement when the force-balance fixture rotates past 0.0 ± 0.1°; and
b) high-efficiency rain showers shall be not less than 0.40 N (1.4 ozf) at a flowing pressure of
140 ± 7 kPa (20 ± 1 psi) at the inlet. The specimen shall be deemed to exceed the minimum spray
force requirement when the force-balance fixture rotates past 0.0 ± 0.1°.
5.12.3.2 Set-up
The specimen shall
a) be thoroughly flushed before measuring the spray force;
b) be connected to a smooth-interior pipe or tube with a length equal to at least 20 times the inside
diameter of the inlet(s) of the specimen;
c) be connected to a pipe or tubing of the same nominal size as the specimen connections;
d) have its standard components installed; and
e) be tested with an apparatus that utilizes a force balance fixture, as illustrated in Figures 7A, 7B, and
8 in accordance with Clauses 5.12.3.3 to 5.12.3.5.
5.12.3.3 Spray force-balance test fixture
The force-balance test fixture shall have a means for measuring the rotation from the horizontal or for
determining the point of balance, or both, and shall be calibrated as follows:
a) ensure
the force balance fixture is dry prior to calibration;
b) esta
blish the zero angle position when the target is at 45 ± 1° to the horizontal and the force-
balance fixture is balanced;
c) position
a force gauge to be in contact perpendicularly with the centre of the target, as illust
rated
in
Figure 9 a);
d) zero
the force gauge;
e) place
counterweights on the force-balance fixture so that it balances the force specified in
Clause
5.12.3.1 applied
at the centre and perpendicular to the target, while maintaining
the
0.0
± 0.1° position, as shown in Figure 9 b); and
f) remove
the force gauge from the force-balance fixture.
The final angle position shall be a non-zero value, calibrated to the force specified in Clause 5.12.3.1.