ASME A112.19.7-2012 pdf – Hydromassage bathtub systems.
4.5 Solvent cements for use with flexible piping
Solvent cements used in the assembly of the recirculation piping of hydromassage bathtubs shaH
(a) be used in accordance with the solvent cement manufacturer’s instructions; and
(b) be suitable for pointing flexible PVC pipe to rigid PVC fittings.
4.6 Suction fittings
Suction fittings shall comply with Clauses 5.3 and 5.4.
4.7 Circulation system Installation
Rigid and flexible piping and tubing shall be installed to allow for drainage of the water from the circulation system in accordance with Clause 5.2. Flexible tubing shall be provided with support to reduce sagging in accordance with the tubing manufacturer’s instructions.
Pumps shall be connected to the drculation system in such a way that they can be removed, repaired, or replaced.
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.
The separation between multiple suction fittings shall be at least 305 mm (12 In). The fittings shall be in different planes.
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
Backf low 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 a’low the passage of a 7.87 mm (0.31 in) circular rod with an applied force of 22 N (S lbf).
S 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-letted 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 Prcconditionlng
The specimen shall be preconditioned as follows:
(a) Fill the specimen with water at 57 ± 3 °C (1 35 ± £F) until the jets are completely covered and it can be properly operated.
(b) Circulate the water (or 2 hr ± 10 mm and ensure that the water temperature is maintained at not less than
54 C (1 30’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 fI oz) (or each jet and
suction fitting. The water retention for air-jetted hydromassage bathtubs shall not exceed 400 mL
(13.5 fi oz), regardless of the number of air jets. Sampling shall be performed in accordance with Annex 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 the requirements of this Clause ii the residual water does not exceed 220 mL (7.5 (1 oz).
The maximum residual water in combination four jet, one suction fitting whirlpool and air-jetted bathtubs shall be 620 mL (21 II oz).
5.2.4 Chlorine test
The following requirements shall apply:
(a) The procedure shall be conducted within a 1 h time interval.
(b) The quality of the water used in the chlorine method shall have a total organic content no greater than 5 mg/I and a pH between 6 and 8, with the pH variation during the test no greater than *0.1.
(c) The original chlorine level shall be accurately measured to within ±0.05 mg/I, recorded, and factored out of the test reading.
To prepare the chlorine solution, approximately 2% of the water in the hydromassage system shall be removed, and the chlorine compound shall be dissolved into the water removed.