ASME A112.19.7:2020 pdf free download.Hydromassage bathtub systems.
4.7.3
When a self-draining volute is not provided, a means to drain the pump volute, e.g., 6.4 mm (0.24 in) ID
tubing, shall be provided. The volute drain opening in a self-draining pump shall be not less than
4.8 mm (0.1875 in) ID.
4.7.4
The separation between multiple suction fittings shall be at least 305 mm (12 in). The fittings shall be in different planes.
4.7.5
The circulation system shall be watertight. Leakage from the circulation system during testing shall be cause for rejection.
4.8 Pump or blower
The location of the pump or blower shall be determined by the manufacturer. A means to fasten the pump or blower shall be provided.
4.9 Field-assembled or retrofitted bathtubs
Field-assembled or retrofitted bathtubs shall meet the requirements of this Standard.
4.10 Backflow prevention
Backflow prevention shall be provided in accordance with the applicable plumbing code for
a) bathtubs with submerged inlets;
b) potable water flush systems; or
c) hydraulic seat lifts.
4.11 Suction fitting assemblies (whirlpool bathtubs only)
Suction fitting assemblies shall be designed so that tools are required for disassembly. Standard slotted screws shall not be used for affixing grates and covers to the suction fitting body.
4.12 Suction fitting cover apertures
Suction fitting cover apertures shall not allow the passage of a 7.87 mm (0.31 in) circular rod with an applied force of 22 N (S lbf).
5 Testing
5.1 Installation
Hydromassage bathtub systems shall be installed in accordance with the manufacturer’s Instructions.
When installation tolerances are specified, the hydromassage system shall be tested in the least
favourable slope for drainage, but within the manufacturer’s specifications.
5.2 Water retention in whirlpool or air-jetted bathtubs
5.2.1 General
Water retention in whirlpool or air-jetted bathtubs may be evaluated using the chlorine test specified in Clause 5.2.4 or the volumetric test specified In Clause 5.2.5.
5.2.2 Preconditioning
The specimen shall be preconditioned as follows:
a)Fill the specimen with water at 57 ± 3 °C(135± 5 *F) until the jets are completely covered and it can be properly operated.
b)Circulate the water for 2 h : 10 min and ensure that the water temperature is maintained at not less than 54C(130 °F).
c)Drain the specimen and allow it to cool to ambient temperature.
5.2.3 Performance Hydromassage bathtubs shall not allow retention of water in excess of 44 mL (1.5 fl oz) for each jet andsuction fitting.The water retention for air-jetted hydromassage bathtubs shall not exceed 400 mL (13.5 fl oz), regardless of the number of air jets. Sampling shall be performed in accordance withAnnex B.
For combination whirlpool and air-jetted bathtubs, the water volumes shall be cumulative.A whirlpool bathtub with four jets and one suction fitting shall be considered to satisfy therequirements of this Clause if the residual water does not exceed 220 mL(7.5 fl oz).
The maximum residual water in combination four jet, one suction fitting whirlpool and air-jettedbathtubs shall be 620 mL (21 fl oz).
ASME A112.19.7:2020 pdf free download
