ASTM F1237-93(1998)
(Specification)Standard Specification for Commercial Dishwashing Machines, Multiple-Tank, Continuous Oval-Conveyor Type, Heat Sanitizing
Standard Specification for Commercial Dishwashing Machines, Multiple-Tank, Continuous Oval-Conveyor Type, Heat Sanitizing
SCOPE
1.1 This specification covers commercial multiple-tank dishwashing machines of the continuous type, oval shaped, with horizontal table conveyor systems.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 The following safety hazards caveat pertains only to Section 12, Test Methods, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F 1237 – 93 (Reapproved 1998)
Standard Specification for
Commercial Dishwashing Machines, Multiple-Tank,
Continuous Oval-Conveyor Type, Heat Sanitizing
This standard is issued under the fixed designation F 1237; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
NOTE 1—NSF 5 applies only if a booster heater is furnished.
1. Scope
ANSI/NSF 29 Detergent/Chemical Feeders for Commercial
1.1 This specification covers commercial multiple-tank
Spray-Type Dishwashing Machines
dishwashing machines of the continuous type, oval shaped,
NSF Listing—Food Equipment
with horizontal table conveyor systems.
2.4 Underwriters Laboratories Standard:
1.2 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for UL 921 Commercial Electric Dishwashers
2.5 American Society of Sanitary Engineering Standards:
information only.
1.3 The following safety hazards caveat pertains only to ASSE 1004 Dishwashers
2.6 Military Standard:
Section 12, Test Methods, of this specification: This standard
does not purport to address all of the safety concerns, if any, MIL-STD-129 Marking for Shipment and Storage
associated with its use. It is the responsibility of the user of this
3. Terminology
standard to establish appropriate safety and health practices
3.1 Definition:
and determine the applicability of regulatory limitations prior
3.1.1 dishwashing machines—machines that uniformly
to use.
wash, rinse, and heat sanitize eating and drinking utensils.
2. Referenced Documents
3.1.1.1 Discussion—The machines shall be capable of re-
2.1 ASTM Standards: moving physical soil from properly racked and prescrapped
items, and sanitizing multiple-use eating and drinking utensils.
A 167 Specification for Stainless and Heat-Resisting
The dishwashing machine and conveyor-table, when as-
Chromium-Nickel Steel Plate, Sheet, and Strip
B 127 Specification for Nickel-Copper Alloy, (UNS sembled, shall form an oval-shaped dish handling system. The
machines shall automatically convey racks of soiled dishes
N04400) Plate, Sheet, and Strip
F 760 Specification for Food Service Equipment Manuals through the treatment stages of the machine, conveying them
out to the clean dish removal area of the conveyor. The
F 861 Specification for Commercial Dishwashing Racks
2.2 Federal Regulations: dishwashing machines shall consist of the following principal
parts: legs, recirculating pre-wash chamber, wash chamber,
OSHA Title 29
2.3 NSF Standards: rinse chamber, tanks, doors, spray assemblies, pumps, motors,
controls, piping, valves, conveying mechanisms, horizontal
ANSI/NSF 3 Commercial Spray-Type Dishwashing and
Glasswashing Machines conveyor tables, heating equipment, and accessories.
NSF 5 Water Heaters, Hot Water Supply Boilers, and Heat
4. Classification
Recovery Equipment
4.1 General—Dishwashing machines shall be of the types,
styles, classes, arrangement, sizes, and capacity groups, as
This specification is under the jurisdiction of ASTM Committee F-26 on Food
specified in 4.2-4.5.
Service Equipment and is the direct responsibility of Subcommittee F26.01 on
Cleaning and Sanitation Equipment.
Current edition approved Dec. 15, 1993. Published February 1994. Originally
published as F 1237 – 89. Last previous edition F 1237 – 89.
Annual Book of ASTM Standards, Vol 01.03.
3 7
Annual Book of ASTM Standards, Vol 02.04. Available from Underwriters Laboratories, Inc., 333 Pfingsten Rd., Northbrook,
Annual Book of ASTM Standards, Vol 15.07. IL 60062.
5 8
Available from the Superintendent of Documents, Government Printing Office, Available from the American Society of Sanitary Engineering, P.O. Box 9712,
Washington, DC 20402. Bay Village, OH 44140.
6 9
Available from NSF International, P.O. Box 130140, Ann Arbor, MI Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
48113–0140. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F 1237
4.2 Types: 6.1.1 Materials used shall be free from defects that would
4.2.1 Type I-CW (clockwise) Rotation— This machine shall affect the performance or maintainability of individual compo-
be designed and supplied to accept the feeding of soiled nents of the overall assembly. The dishwashing machines shall
tableware from the right side, when viewed from above. meet the material design and construction requirements of
4.2.2 Type II-CCW (counterclockwise) Rotation—This ma- ANSI/NSF 3.
chine shall be designed and supplied to accept the feeding of 6.1.2 Corrosion-Resistant Steel—Corrosion-resistant steel
soiled tableware from the left side, when viewed from above. shall conform to the requirements of any 300 series stainless
4.3 Styles and Classes: steel.
6.1.3 Corrosion-Resisting Material—Corrosion-resisting
4.3.1 Style 1 (Steam Heated)—Low-pressure steam [10 to
15 psi (68.9 to 103.4 kPa)] flowing pressure at point of material is material other than corrosion-resistant steel that is
machine connection. equivalent in the dishwasher application.
4.3.1.1 Class A—Style 1 dishwashing machine that uses 6.1.4 Nickel-Copper Alloy—Nickel-copper alloy shall con-
form to the requirements of Specification B 127.
steam injectors.
4.3.1.2 Class B—Style 1 dishwashing machine that uses
7. Construction Requirements
heat exchange steam coils.
7.1 The dishwashing machine shall be complete so that
4.3.2 Style 2 (Electrically Heated).
when connected to the specified source of power, water supply,
4.4 Arrangement:
heating means (steam or electric) and drainage, detergent and
4.4.1 Arrangement A—With tray rail and table-mounted
rinse agent feeder as applicable, the unit can be used for its
garbage disposal machine.
intended function. Dishwashers shall be quiet in operation, free
4.4.2 Arrangement B—With food waste trough instead of
from objectionable splashing of water to the outside of the
tray rail; garbage disposal machine in center of trough.
machine. The machine shall be equipped with splash curtains
4.4.3 Arrangement C—Same as Arrangement A, except
to prevent excessive splash and spray carryover. Parts requiring
disposal unit not furnished; food discharged to garbage can at
adjustment or service, or both, shall be readily accessible from
disposal location.
the front and side of the machine. The machine shall wash
4.4.4 Arrangement D—Same as Arrangement B, except
dishes by means of a water and detergent solution pumped
disposal unit not furnished; food discharged to garbage can at
from a tank and shall pump rinse the dishes under pump
disposal location.
pressure prior to the final rinse of fresh water from an outside
3 3
4.5 Capacity—240 racks per hour minimum, 19 ⁄4 by 19 ⁄4
source. Provisions shall be made to fill the wash and rinse tank
in. (nominal) or equivalent meeting capacity requirement.
either directly from the regular hot water supply with a hand
valve or through the booster or solenoid, or both, provided the
5. Ordering Information
water temperatures comply with the provisions of ANSI/NSF
5.1 Purchasers should select the preferred options permitted
3. The dishwashing machine shall have a conveyor for han-
in this specification and include the information in 5.1.1 and
3 3
dling 19 ⁄4 by 19 ⁄4 in. (nominal) racks, or equivalent meeting
5.1.2 in the procurement document.
capacity requirement. The conveyor shall be protected by an
5.1.1 Title, designation number, and date of this specifica-
adjustable slip clutch or other device. Means shall be provided
tion.
for releasing or disconnecting the drive power, or the drive in
5.1.2 Type, style, class, and arrangement required (see 4.1),
case of jamming. The conveyor shall be driven by a separate
5.1.3 Noise level requirements, if other than specified (see
motor. The final rinse spray control shall have a positive return
11.2),
to the OFF position when there are no racks in process to
5.1.4 Whether a service-supply valve is required (see 7.5),
ensure the conservation of final rinse water. The machine shall
5.1.5 Whether a standard 40°F (22°C) temperature rise
be provided with tracks of corrosion-resistant steel or other
steam or electric booster is required, or stipulate if the required
corrosion-resisting material not less than 0.070 in. (1.78 mm)
temperature rise is more than 40°F (22°C) (see 7.14),
or equivalent die formed, not less than 0.059 in. (1.5 mm)
5.1.6 Electrical power supply characteristics (current, volt-
thick. Dishwashers shall have an inside working height of not
age, phase, frequency) (see Section 8),
less than 17.5 in. (444.5 mm) above the track.
5.1.7 Whether a detergent feeder is required (see 7.15),
7.2 Conveyor—The conveyor shall be of heavy-duty con-
5.1.8 Whether a rinse agent feeder is required (see 7.16),
struction, and of suitable corrosion-resisting material. It shall
5.1.9 Accessory equipment required, such as end cowls with
be designed to convey racks conforming to Specification F 861
vent openings, or spare and maintenance parts as suggested by
through the dishwasher automatically.
the manufacturer.
7.2.1 Conveyor Clutch System—An automatic trouble free
5.1.10 Treatment and painting if other than specified (see
clutch system, springloaded, or adjustable slip clutch, and of
Section 10),
the automatic re-engaging type, shall be furnished to shut down
5.1.11 Manufacturer’s certification, when required (see Sec-
the conveyor in case of a jam or other mechanical malfunc-
tion 13),
tion(s).
5.1.12 Whether a silver soak sink is required (see 7.16).
7.2.2 Conveyor Table(s)—The conveyor table shall be con-
structed of not less than 0.070 in. thick (1.78 mm) corrosion-
6. Materials
resistant steel or other corrosion-resisting material. The legs
6.1 All materials shall be specified as follows: shall be preassembled with suitable cross bracing and shall be
F 1237
furnished with NSF listed adjustable feet. The table shall shall be rigid and stiffened as necessary. Door safety catches
include a mechanical conveyor system designed to continu- shall be provided for maximum operator safety, and the door
ously transfer dishes or racks at the rate of 6 to 8 ft/min. The handles shall be of insulated handle design. Doors shall be
conveyor tables shall be furnished in the arrangement selected splash-proof and their exposed edges shall be smooth and
(see 4.4). The conveyor table shall be sectioned for shipment. formed to prevent canting or warping. One door assembly shall
be furnished for each tank.
7.3 Piping, Tubing, Fittings, and Valves (Installation)—
Connections shall be readily accessible to facilitate installation 7.9 Legs (Feet)—The machine shall be rigidly constructed
and maintenance. Piping, tubing, and valves shall be located, and have four or more legs (feet) made of corrosion-resistant
when ever possible, on the exterior of the machine. steel, or other corrosion-resisting material. Legs shall be
adjustable, so that the height of the track may be varied from
7.3.1 Piping and Fittings—Water, steam piping, and fittings
34 to 35 in. (863.6 to 889 mm) above the floor.
shall be of corrosion-resisting material. Fresh water supply to
the tank shall be discharged not lower than 2 in. (50.8 mm) 7.10 Pump and Motor Assemblies:
above the maximum flood level rim, or an effective air gap and
7.10.1 Assemblies—The pump and motor assembly shall be
an EPA Cross Connection Control Manual approved back flow
mounted on the tank or on a rigid base fabricated of corrosion-
prevention device capable of withstanding 210°F water tem-
resistant steel. Rotary seals shall be provided for pump shafts.
peratures. Backflow protection shall be in accordance with
7.10.2 Pump—Pump casings shall be cast iron or corrosion-
ASSE No. 1004. The drain and other plumbing connections
resisting material and shall have a removable cover or inspec-
shall be standard pipe or tubing connections. Drainage piping
tion plate, or be of such design as to permit ease of accessibility
shall be corrosion-resisting material, or suitable heat-resisting
for inspection and removal of foreign items from the impeller
plastic tubing with fittings. Drains may be joined into a single
and interior. The pump shall either be self-draining or equipped
trunk line requiring only one connection or arranged to permit
with means for draining. The pump suction intake shall be
individual connections to the waste line.
provided with a corrosion-resistant strainer or shroud.
7.3.2 Valves—When specified, steam valves shall be of
7.11 Heating—Style 1 and Style 2 machines shall be
corrosion-resisting material designed for steam applications
capable of maintaining required temperature levels in the
and for a saturated steam working pressure of 35 psi (241 kPa).
tanks.
When specified, a separately packed service supply valve shall
7.11.1 Style 1—Style 1 machines shall be suitable for
be provided for closing the supply of water to the dishwasher.
operation with a steam supply flow pressure from 20 to 35 psi
The drain valve shall be permanently marked to show open and
(137.9 to 241.3 kPa). Temperature regulators (thermostats)
closed position and shall be lever-operated or wheel-operated,
shall be provided for maintaining the proper water temperature
ruggedly designed for foot or hand operation except when
in the tanks. Low water protection shall be provided. Steam
drain valve closure is automatic. Fresh-water rinse valves shall
heat will be provided by tube type hat exchangers, steam
be reliable and fully automatic and suitable for 210°F (98.9°C)
injectors, or a combination of both. Check valves or vacuum
water. The manually operated valves, when used, shall be
breakers must be used on all injector-type heating units to
identified.
prevent back siphoning. The minimum operating pressure shall
7.4 Spray Assemblies—All spray nozzles and spray arm
be specified by the manufacturer and the maximum operating
manifolds shall be corrosion-resisting materials. All spray
pressure shall not exceed 15 psi (106.4 kPa).
assemblies shall be removable without the use of tools and
7.11.2 Style 2—Style 2 machines shall be equipped with
shall be easy to clean.
electric heater elements and sheaths of 300 series corrosionre-
7.5 Tank—The tank shall be constructed of not less than
sistant steel or other corrosion-resisting material. They shall be
0.048 in. (1.219 mm) thick corrosion-resistant steel, Type
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