1、ASME A112.14.3-2000GREASEINTERCEPTORSA N A M E R I C A N N A T I O N A L S T A N D A R DA N A M E R I C A N N A T I O N A L S T A N D A R DGREASEINTERCEPTORSASME A112.14.3-2000Date of Issuance: August 31, 2001The next edition of this Standard is scheduled for publication in 2005. Therewill be no add
2、enda or written interpretations of the requirements of thisStandard issued to this edition.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria forAmerican National Standards. The Stan
3、dards Committee that approved the code or standardwas balanced to assure that individuals from competent and concerned interests have had anopportunity to participate. The proposed code or standard was made available for public reviewand comment that provides an opportunity for additional public inp
4、ut from industry, academia,regulatory agencies, and the public-at-large.ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted inconnection with any items mentione
5、d in this document, and does not undertake to insure anyoneutilizing a standard against liability for infringement of any applicable letters patent, nor assumeany such liability. Users of a code or standard are expressly advised that determination of thevalidity of any such patent rights, and the ri
6、sk of infringement of such rights, is entirely theirown responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not tobe interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretat
7、ions of this document issued inaccordance with the established ASME procedures and policies, which precludes the issuanceof interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the
8、 publisher.The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2001 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.FOREWORDIn 1994, the Plumbing and Drainage Institute agreed to work with the American Societyof Mechanical
9、 Engineers for the development of this Standard. This Standard includes criteriafor testing and rating of grease interceptors; general requirements for these appurtenances; andan appendix of valuable sizing, installation, and maintenance data.The Plumbing and Drainage Institute has a membership of o
10、rganizations that manufactureproducts for the plumbing industry. The basic aim of PDI is to contribute its combinedtalents and resources to the advancement of plumbing engineering and the plumbing industry.This Standard was developed with the assistance of the Plumbing and Drainage Institute.For mor
11、e than a century, grease interceptors have been used in plumbing wastewatersystems to permit free flow of drainage from sinks and similar equipment and to preventgrease accumulations from clogging connecting piping and sewer lines. In 1883, one NathanielT. Whiting of California applied for a patent
12、on a grease trap, which was issued in October1884. Whitings design principle does not differ greatly from present-day grease interceptors.For the next 50 years, there was no coordinated effort to standardize ratings or toestablish performance requirements for grease interceptors. Ratings were determ
13、ined by eachmanufacturer for its interceptors, which were produced in a variety of sizes and types inan effort to meet engineers specifications and satisfy code requirements.In late 1940 and early 1941, prior to the United States entry into World War II, greaseinterceptors were specified for Army po
14、sts to meet specifications of the Construction Division,Office of the Quartermaster General. These specifications called for interceptors, whichproved inadequate; it immediately became apparent that a comprehensive engineering andtesting program was needed to properly rate grease interceptors. Apart
15、 from prevention ofsewage systems clogging, properly rated and sized grease interceptors were essential to therecovery of oils and grease so badly needed for the war effort. As a result, a series ofconferences involving the Research Committee of the Plumbing and Drainage ManufacturersAssociation (no
16、w Plumbing and Drainage Institute), representatives of the QuartermasterGeneral, Surgeon General, Army Corps of Engineers, and others was held to develop atesting program to establish flow rates and grease holding capacity for uniform rating ofgrease interceptors manufactured at that time.The progra
17、m that emerged from these conferences included exhaustive laboratory testingof each grease interceptor at the Iowa Institute of HydrauIic Research at Iowa StateUniversity. This phase of the program was covered in a comprehensive report issued inAugust 1945. Using the guidelines established in Iowa,
18、the Research Committee continuedthe testing program at the United States Testing Company, Inc., which culminated in thepublication of Standard PDI-G101 in 1949 and the rating of applicable grease interceptors.Since its initial publication, Standard PDI-G101 has been widely accepted and is referenced
19、in most plumbing codes. It has been reprinted in its original format many times.The Plumbing and Drainage Institute currently maintains a grease interceptor testing,rating, and certification facility.The scope of this Standard is limited to units of 100 gallons per minute (gpm) or lessin rated capac
20、ity. Units over the 100 gpm value shall be engineered for the demand ratedflows of the jobsite requirements and specifications.iiiThe Committee recognizes that a number of sewage treatment communities and otherjurisdictions have established various maximum limits of fats, oils, and greases (FOG) int
21、he waste stream. The most common of these is 100 mg/L or 100 ppm. The Committeedecided that until a specific maximum limit is universally accepted, no number should beincluded in the Standard. The inclusion of a maximum limit will be reconsidered foradoption in a future edition of this Standard.Sugg
22、estions for the improvement of this Standard are welcome. They should be sent toThe American Society of Mechanical Engineers; Attn: Secretary, A112 Main Committee;Three Park Avenue; New York, NY 10016-5990.This Standard was approved as an American National Standard on November 1, 2000.ivASME STANDAR
23、DS COMMITTEE A112Standardization of Plumbing Materials and Equipment(The following is the roster of the Committee at the time of approval of this Standard.)OFFICERSP. J. Higgins, ChairS. A. Remedios, Vice ChairC. J. Gomez, SecretaryCOMMITTEE PERSONNELR. H. Ackroyd, Rand EngineeringJ. A. Ballanco, JB
24、 Engineering 2 ft (0.60 m) in width; 1212in. (0.32 m)in depth. The sink shall be constructed of corrosion-resistant material and shall have two compartments,each 4 ft (1.22 m) in length. The sink shall be structurallyreinforced and supported on legs. The legs shall be ofproper length so that the rim
25、 of the sink will be 3 ft(0.91 m) above the floor. The sink legs shall bestructurally braced.Two sinks of the above description shall be usedwhen tests are conducted for flow rates greater than50 gpm (190 L/m) but not exceeding 100 gpm (380L/m).3.1.1.1 Sink Waste Connections. Each sinkcompartment sh
26、all be fitted with a 112in. (38 mm)standard sink waste connection with flange, crossbars,threaded or slip joint tailpiece, and locknut. The wasteconnections shall be located on opposite sides of thecenter partition in the corner formed by the side ofthe sink and the center partition.3.1.1.2 Water Le
27、vel Gauges. Each compart-ment shall be equipped with a gauge connection anda water level gauge with gauge glass. Each gaugeconnection shall be fitted into the bottom of a sinkcompartment and in close proximity to the waste outlet.Each gauge shall be mounted on the outside of thesink, adjacent to its
28、 respective gauge connection, andshall extend diagonally upward from the bottom center2to the top outside corners. These gauges shall becalibrated to read directly the number of inches ofwater in the sink compartments above the sink wasteflange.3.1.1.3 Movable Sink Partitions. Each com-partment of t
29、he sink shall be fitted with a movablepartition, making it possible to regulate the size of thecompartment to any desired capacity.3.1.2 Skimming Tank. The skimming tank shallbe rectangular in shape; open at the top and equippedwith a stationary baffle located approximately 3 ft (0.91m) from the end
30、 of the tank receiving the dischargefrom the interceptor. This baffle shall extend the widthof the tank and to within 4 in. (100 mm) of the bottomof the tank. The purpose of this baffle shall be to limitthe heavy spread of grease to one end of the tank andto control to a degree the turbulent water c
31、urrentscreated by the overflow from the interceptor. Thedimensions of the tank shall be approximately 8 ft(2.44 m) in length, 28 in. (0.70 m) in width, and 32in. (0.81 m) in depth. The tank shall be constructedof galvanized sheet or corrosion-resistant metal withstructural reinforcement. The waste o
32、utlet from the tankshall be 4 in. (100 mm) in diameter, connected to thebottom of the tank at one end and trapped to retainapproximately 26 in. (0.66 m) of water in the tank.The tank shall also be provided with a 4-in. (100 mm)valved bottom drain to permit draining and cleaning.3.2 Installation of T
33、esting Equipment3.2.1 Direct Connection Test Types A, B, andC. See Figs. 1 and 2.3.2.1.1 Waste Piping. The combined horizontalwaste, vertical waste riser, interceptor inlet, and dis-charge piping shall be 2 in. (50 mm) for test flowsof 50 gpm (190 L/m) or less and 3 in. (76 mm) fortest flows over 50
34、 gpm (190 L/m).3.2.1.2 Sink and Interceptor Locations. Thesink shall be located with the sink rim 13 ft (3.96 m)above the outside bottom of the grease interceptor beingtested.3.2.1.3 Skimming Tank Location. The skim-ming tank shall be located low enough, with respectto the interceptor, for the disch
35、arge piping from theinterceptor to clear the tank rim by not less than 3 in.(76 mm).3.2.1.4 Installation of Waste Piping(a) Sink Connections. The sink outlet waste connec-tion from each sink compartment shall be 112in.GREASE INTERCEPTORS ASME A112.14.3-2000Tank wasteoutletGENERAL NOTE: See para. 2.2
36、.Grease interceptor3 in. (76 mm)min.Upper flooror equivalentsink support11 in. (0.28 m)3 ft (0.91 m)Water level gaugeMovable partitionFlow controlair intake rating(Type A rating only)Flow controldevice13 ft (3.96 m)QuickopeningvalvesSkimmingtankFIG. 1 GREASE INTERCEPTOR TEST CONFIGURATION FOR RATING
37、 TYPES A AND BTank wasteoutletGrease interceptor3 in. (76 mm)min.Upper flooror equivalentsink support11 in. (0.28 m)Water level gaugeMovable partitionVent13 ft (3.96 m)QuickopeningvalvesSkimmingtankGENERAL NOTE: See para. 2.2.3 ft (0.91 m)FIG. 2 GREASE INTERCEPTOR TEST CONFIGURATION FOR RATING TYPE
38、C3GREASE INTERCEPTORSASME A112.14.3-2000(38 mm) in size and each connection shall be fittedwith a quick-opening gate valve.(b) Combined Horizontal Waste Piping. The com-bined horizontal waste piping into which the sink outletsconnect shall be installed with the center line 11 in.(0.28 m) below the b
39、ottom of the sink and properlyhung and braced from the sink reinforcement andsupports. This waste pipe shall be fitted to the inletof a vented (air intake) flow control and/or vent orequal device (if required for use with the interceptor).(c) Flow Control and/or Vent Device (Optional).The flow contr
40、ol and/or vent device shall be adequatein size for the interceptor to be tested and shall beequipped with the proper size orifice and/or otherdetails to provide the proposed flow rate of the subjectinterceptor, based on the simultaneous drainage of bothsink compartments as detailed hereinafter. The
41、wastepiping on either side of the flow control and/or ventshall be fitted with unions to permit removal of thedevice.(d) Vertical Waste Riser. The vertical waste risershall be connected to the outlet of the flow control and/or vent device and shall extend downward to connect tothe grease interceptor
42、 inlet by means of an elbow anda short horizontal nipple.(e) Interceptor Discharge. The discharge pipe fromthe interceptor outlet to the skimming tank shall havea minimum pitch of18in. per ft (1 cm per m) andshall be provided with a 2-in. (50 mm) vent properlylocated to prevent siphoning of the inte
43、rceptor.(f) Interceptor Connections. If the inlet and/or outletopenings of the interceptor to be tested exceed 2 in.(50 mm) or 3 in. (76 mm) for test flows exceeding50 gpm (190 L/m) in size, reducing couplings shallbe used to permit connections of the 2 in. (50 mm)or 3 in. (76 mm) for test flows exc
44、eeding 50 gpm(190 L/m), inlet and discharge pipes.3.2.2 Indirect Connection Test Type D. SeeFig. 3.3.2.2.1 Sink and Interceptor Location. Thesink shall be located on a floor with the sink rim 3ft (0.91 m) above the floor level and 13 ft (3.96 m)above the outside bottom of the grease interceptor bein
45、gtested.3.2.2.2 Floor Sink and Location. A 6 in. (152mm) deep floor sink to receive the indirect wastedischarge from the test sink shall be located in thefloor supporting the test sink. The rim of the floorsink shall be located at floor level. The outlet of the4floor sink shall be sized to handle th
46、e test flow rate,and shall be not less than 3 in. (76 mm).3.2.2.3 Skimming Tank Location. The skim-ming tank shall be located low enough, with respectto the interceptor, for the discharge piping from theinterceptor to clear the tank rim by not less than 3 in.(76 mm).3.2.2.4 Installation of Waste Pip
47、ing(a) Sink Connections. The sink outlet waste connec-tion from each sink compartment shall be 112in. (38mm) in size and each connection shall be fitted witha quick-opening gate valve.(b) Combined Horizontal Waste Piping. The com-bined horizontal waste piping into which the sink outletsconnect shall
48、 be 3 in. (76 mm) installed with the centerline 11 in. (0.28 m) below the bottom of the sink andproperly hung and braced from the sink reinforcementand supports. This waste pipe shall connect to a single3-in. (76 mm) ball valve that shall serve to regulatethe total discharge flow rate. The pipe conn
49、ected tothe ball valve outlet shall turn downward 90 deg andshall terminate 1 in. (25 mm) above the rim and atthe center line of the floor sink.(c) Floor Sink to Interceptor Piping. A trap fittingshall be connected to the outlet of the floor sink, ofa size appropriate for the flow rate tested, but not lessthan 3 in. (76 mm). Horizontal piping of the samesize and 3 ft (0.91 m) in length with a vent shall beconnected between the floor sink elbow and the verticalwaste riser, which shall extend downward to connectto the grease interceptor inlet by means of an elbowand a short horizontal
