ASME A112.14.3:2018 pdf free download – Hydromechanical Grease Interceptors
1.1 Scope
This Standard covers general product requirements as well as the performance criteria for the testing and rating ofhydromechanical grease interceptors, rated by flow in gallons per minute (gpm) or liters per minute (L/min).
1.2 Units of Measurement
Values are stated in U.S. Customary units and in the International System of Units (SI). The U.S. Customary units shall be considered as the standard.
1.4 Definitions
breakdown grease capacity: the numberofpounds or kilo- grams of grease a grease interceptor retains at a specific flow rate at the last increment preceding two successive increments in which either the average efficiency is less than 90% or the incremental efficiency is less than 80%. directlyconnected: a grease interceptorthatis designed to receive the discharge directlyfrom fixtures withoutan air gap or air breakand be directlyor indirectlyconnected to the plumbing drainage system. flow control, unvented: a device installed upstream of or within the interceptor, having an orifice that controls the rate of flow through the interceptor. flow control, vented: a device installed upstream of the interceptor having an orifice and air intake (vent) down- stream from the orifice which allows air to be drawn into the flow.
The device thatcontrols the rate offlow through the interceptor, and an air intake (vent) downstream to the interceptor. hydromechanical grease interceptor: a plumbing appurte- nance or appliance installed in a sanitarydrainage system to intercept nonpetroleum fats, oils, and greases (FOG) from a wastewater discharge; rated by flow. The design incorporates, air entrainment, hydromechanical separation, interior baffling, and/or barriers in combina- tion or separately, and one or more of the following:
(a) externalflowcontrol,withairintake(vent),directly connected
(b) external flow control, without air intake (vent), directly connected
(c) without external flow control, directly connected
(d) withoutexternal flow control, indirectly connected
indirectly connected: a grease interceptor that is designed toreceivethedischargefromfixturesthroughanairgapor air break and be directly or indirectly connected to the plumbing drainage system. minimum grease capacity: the number of pounds or kilo- gramsofgreaseagreaseinterceptormustretainataspeci- fied flow rate from Table 1.
2.3.1 The use and placement of flow controls and/or vents or air intakes for grease interceptors shall be in accordance with the manufacturer’s installation require- ments. When a flow control is not required by the manu- facturer, testing shall be conducted at the manufacturer’s prescribed rate offlow withoutany restriction ofthe flow from the test apparatus to the grease interceptor.
2.3.2 When a flowcontrol (vented or unvented) and/or ventis used during testing for rating a grease interceptor, the rating of the unit shall not exceed the tested flow through the flow control. The manufacturer’s literature shall reflect that the rating was achieved with the flow control and/or vent attached, and that the flow control and/or vent shall be installed with the unit.
3.1.1.1 Sink Waste Connections. For sinks constructed per para. 3.1.1(b), each sink compartment shall be fitted with a 1 1 ∕ 2 in. (38 mm) standard sink waste connection with flange, threaded or slip joint tail- piece, and locknut. The waste connections shall be located on opposite sides of the center partition in the corner formed by the front side of the sink and the center partition. For sinks constructed per para. 3.1.1(c), each sink compartment shall be fitted with a 2 in. (51 mm) sink waste connection with flange, threaded or slip joint tail- piece, and locknut. The waste connections shall be located on opposite sides of the center partition in the corner formed by the front side of the sink and the center partition.
3.1.1.2 WaterLevelGauges. Each compartmentshall be equipped with a gauge connection and a water level gauge with gauge glass. Each gauge connection shall be fitted into the bottom of a sink compartment and in close proximity to the waste outlet. Each gauge shall be mounted on the outside of the sink, adjacent to its respective gauge connection, and shall extend diagonally upwardfromthebottomcentertothetop outsidecorners. These gauges shall be calibrated to read the number of inches of water in the sink compartments above the sink waste flange.