ASME A112.3.4-2013 pdf – Plumbing fixtures with pumped waste and macerating toilet systems.
4.2.4 Function
The unit shall dispose of the contents of the water closet upon activation of the flushing mechanism. The maccrating pump shall be capable of discharging the ground-up waste a distance of 3.7 m (12 ft) in vertical height as covered in Clause 5.2.
4.2.5 Hydrostatic pressure integrity
The check valve in the holding tank shall be capable of resisting a hydrostatic pressure test as defined in
Clause 5.3.
4.2.6 Minimum size
The minimum size of the pressure portion of the piping shall be 19 mm (0.75 in) inside diameter.
4.2.7 VentIng
The sump shall be vented according to the manufacturers instructions with a minimum vent size of not
less than 32 mm (1.25 in) inside diameter.
Not.: Ttws is no considered to be a sewage sump.
4.3 Pumped waste components
4.3.1 Pump
The pump for pumped waste systems shall comply with either UL 778 or CSA C22.2 No. 108 and meet the performance requirements for permanently Installed pumps.
4.3.1.1 Pump activation and function
The pump shall automatically actl%’ate to discharge the contents ol the tixture when the lixture is used.
The pump system shall prevent waste from rising in the fixture. The pump shall be capable of discharging
the waste to a vertical height of 3.7 m (12 It) as covered in Clause 5.2.
4.3.2 Discharge pipe
The discharge pipe from the pump of a pumped waste system shall be a minimum size of 19 mm (0.75 in) nominal.
4.3.3 Backflow prevention
A check valve shall be provided with the pumped waste system to prevent the retum of discharged waste to the plumbing fixture. The check valve shall be capable of resisting a 3.7 m (12 ft) column of water head pressure when tested in accordance with Clause 5.3.
4.3.4 Venting not required
A vent shall not be required for a pumped waste system.
S Performance tests
5.1 Cycle testing
5.1.1 Test method
The maccrating pump and pump for a lavatory or sink pumped waste system shall be ‘ron/off” tested 50,000 times. The pump br a shower or bathtub pumped waste shall be cycled tested on/obf” for 5,000 cycles. One cycle shall be ‘on for 5 sec and “off for 5 sec.
5.1.2 Acceptance criteria
Upon completion of the on/olf” or cycle testing. macerating systems shall demonstrate the ability to meet the performance requirements as outlined in Clauses 5.2 and 5.3; pumped waste systems shall demonstrate the ability to meet the performance requirements outlined in Clauses 5.3 and 5.4
5.2 Paper test of the assembled unit
5.2.1 Set-up
The paper test shall be conducted as follows:
(a) The maccrating unit and water closet shall be assembled in accordance with the manufacturer’s instructions.
(b) The discharge piping from the unit shall be installed to the maximum elevation and horizontal run stated by the manufacturer.
(c) The check valve shall be installed within the discharge line in accordance with the manufacturer’s instructions.
(d) Discharge pipe size as recommended by the manufacturer shall be installed vertically for 3.7 m (12 ft) of discharge and then directed to a safe place of discharge
(e) The water closet shall be filled with water and pressurized to the minimum pressure recommended by the manufacturer.
(f) Two thousand sheets of single-ply toilet paper shall be weighed, then separated into four sets of 50 ten-sheet lots.
5.2.2 Test procedure
(a) Ten sheets of single-ply toilet paper at a time shall be distributed evenly in the water closet bowl and the unit shall be flushed,
(b) With each successive flush, there shall be no evidence of paper returning to the bowl.
(c) After conducting 50 consecutive flush tests, three additional flushes without paper shall be made.
(d) The water closet shall then be removed from the housing unit and the internal walls and bottom of the housing shall be inspected for any collection of paper.
(e) The test shall Continue to be conducted for an additional 150 cycles, stopping at every 50 paper/three no-paper cycle in order to inspect the internal housing for paper collection,
(f) After completion of the cycle tests, all paper on the wall and bottom of the housing unit shall be removed, dried, and weighed.
5.2.3 Performance requirement
The failure of the unit to meet the following criteria shall be cause for rejection of the unit:
(a) After each successive flush in Clause 5.2.2(a), (d), and (e), there shall be no evidence of paper returning to the bowl.
(b) Not more than 5% of the total weight of the 2000 sheets shall remain clinging to the wall and bottom of the housing after testing.
(c) If a grille is provided, there shall be no more than 50% blockage of the surface area, as determined by visual inspection.
5.3 hydrostatIc pressure test of the check valve
5.3.1 Test method
The holding tank or pumped waste system shall be installed in accordance with the manufacturer’s instructions. The check or non-return valve for either the tank or pumped waste system shall be subjected to a 3.7 m (12 ft) column of water head pressure.
5.3.2 Performance requirement
The check or non-return valve shall not leak.