NAVY A-A-59364-1999 TUMBLER-DRYER LAUNDRY STEAM AND ELECTRIC (NAVAL SHIPBOARD) [Superseded NAVY MIL-T-23480 A CANC NOTICE 1 NAVY MIL-T-23480 A (1) NAVY MIL-T-23480 A NAVY MIL-T-234.pdf

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1、I INCH-POUNDI COMMERC I A-A-59364 21 Januarv 1999 SUPERSEDING MIL-T-23480A 27 September 1990 ITEM DESCRIPTION TUMBLER-DRYER, LAUNDRY, STEAM, AND ELECTRIC (NAVAL SHIPBOARD) The General Services Administration has authorized the use of this commercial item description for all federal agencies. 1. SCOP

2、E This commercial item description (CID) covers the 50-pound and 100-pound dry weight capacity modified commercial laundry tumbler-dryer machines for Naval shipboard use. 2. CLASSIFICATION Type 1: Steam heated Size 1 - 50-pound dry weight Size 2 - 100-pound dry weight Size 1 - 50-pound dry weight Ty

3、pe 2: Electrically heated 3. SALIENT CHARACTERISTICS 3.1 Desian and construction. The tumbler-dryer shall be a reversing, open end, once through, end loading machine constructed so that the h-ated air does not circulate back through the cylinder. Components shall be arrall,ed so that side clearance

4、shall not be required for installation or maintenance. This will allow for multiple tumbler-dryers to be placed side-by-side. The tumbler- dryer shall adequately hold a load of cotton cloth not less than 50 pounds dry weight for a size 1 tumbler-dryer and 100 pounds dry weight for a size 2 tumbler-d

5、ryer. The size 1 unit shall weigh not greater than 900 pounds; the size 2 unit shall weigh not greater than 1650 pounds. 3.1.1 Housinq. The entire unit shall be enclosed in a housing finished for corrosion resistance. The housing enclosing the machine shall be tight except for the inlet, outlet, acc

6、ess plate, and door openings. When in place, doors and access plates shall be tight fitting. Doors or access plates shall be provided and shall be sized to ensure adequate accessibility for maintenance and repair of the unit. The unit housing shall encase the insulation with internal stiffening memb

7、ers. The interior surfaces shall consist of a smooth- to-the-touch finish and shall preclude lint buildup. Beneficial comments, recommendations, additions, deletions, clarifications, etc., and any other data which may improve this document should be sent to: Commander, Naval Sea Systems Command, 253

8、1 Jefferson Davis Highway, Arlington, VA 22242-5160. AMSC N/A FSC 3510 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A- 5 9 3 64 - 3.1.2 Selective temoeratures. Tem

9、perature settings shall be manually adjustable, and a digital temperature indicator shall be provided. A thermostatic control, which operates the steam solenoid valve on the type 1 tumbler-dryers or the electric heater control on the type 2 tumbler-dryers shall maintain either of the two selectable

10、temperatures of 155 OF and 185 OF k 10 OF. An indicator light shall be provided in the vicinity of the control panel and activate while the steam coil or electric heating element is energized. 3.1.2.1 TemDerature limit control. In addition to the primary thermostatic control (paragraph 3.1.2) a back

11、 up high limit heat sensor shall be located in the lint chamber below the cylinder which shall interrupt steam flow on type 1 dryers or power on type 2 dryers to the heating elements should the cylinder temperature exceed 215 OF 2 10 OF. Reset shall be accomplished automatically. Also, the steam sol

12、enoid coil on type 1 dryers or the heating element contactor on type 2 dryers shall be interlocked with the fan motor contactor which shall interrupt heating in the event of fan motor failure. (Shipboard requirement, see 7.2) 3.1.3 Timed drvina cycle. A timer with a range of O to 60 minutes and an i

13、ndicator light shall be provided for selecting the drying time and indicating normal drying operation. 3.1.4 Cool down cvcle. Immediately following the drying cycle the heating elements shall be de-energized and a cool down cycle shall be automatically activated until the cylinder temperature drops

14、to 135 OF. An indicator light shall be provided in the vicinity of the control panel and activate during the c- down cycle. An audible signal shall energize at the end of the cool down cycle iind shall continue until manually turned off. 3.“ 5 SweeD sheets. The sweep sheets shall be corrosion resist

15、ant and cylindrical in shape. If adequate access is not provided through the lint chamber, access plates shall be provided in the front and rear for removing lint from between the cylinder basket, sweep sheets, and housing. 3.1.6 Door. An insulated loading door concentric with the cylinder opening s

16、hall be provided at the front of the housing. The door shall act as a baffle for retaining the load within the cylinder. It shall be of the same material as the housing and shall be durably hinged. The door shall be provided with a handle and a means of latching when it is closed and when it is open

17、ed to a minimum of 135 degrees from the closed position. Magnetic devices shall not be used. An electric interlock shall be provided to prevent any rotation of the cylinder when the door is in the open position. The latching mechanism shall allow a person trapped within the cylinder basket to push t

18、he door open. 3.1.7 Exhaust . An opening shall be provided for exhausting air after passage through the tumbler and filter. The opening shall be provided with an exhaust duct for connecting to the ships ventilation system and shall be of sufficient volume to meet the requirements of 3.4. 3.1.7.1 W.

19、A fan of sufficient capacity to meet the drying requirements of 3.4.1 shall be provided. 3.1.8 Lint box and screens. resistant wire mesh screen through which all exhaust air shall flow. The screen shall be installed between the cylinder and the fan. The screen shall be accessible, cleanable, and rem

20、ovable from the front of the tumbler-dryer. The screen size shall be number 14 wire mesh or equivalent. An access door shall be provided with a keyless handle to provide quick and convenient access to the lint screen. A box shall be provided with a corrosion 2 Provided by IHSNot for ResaleNo reprodu

21、ction or networking permitted without license from IHS-,-,- A-A-593 64 Size 3.1.9 Heatins unit. tme 1, steam heated. The heating unit shall consist of a continuous tube with closely spaced fins for efficient heat transfer. Coils shall be suitable for a steam pressure of 100 psi gauge and provided wi

22、th a 1- inch female taper pipe thread size inlet and outlet connections. The heating unit shall be in accordance with the ASME Boiler and Pressure Vessel Code, section II and VIII. The heater shall be located in a position which produces even heating and distribution of the air entering the cylinder

23、. No leaks or distortion shall be permitted anywhere in the system. 3.1.10 Heatinu unit. tm e 2, electricallv heated. Heating elements shall be configured into an assembly within a chamber. Element shaping shall be done by the heating element manufacturer. Each element shall be fastened securely at

24、one end and supported or fastened at the other end. The heating element shall be easily removable from the front of the tumbler-dryer. The heating element assembly shall be integrated with the temperature controls. The heating element assembly power requirements shall be not greater than 36 kilowatt

25、s when operated in the high temperature mode, and shall balance a three-phase load. The electric heating elements on the type 2 unit shall withstand a dielectric voltage of twice the rated line voltage plus 1000 volts without the element shorting. The cold and hot insulation resistance shall be not

26、less than 25 and 10 megohms, respectively. 3.1.11 Insulation of housinq. The outer housing, door and other components contacted by the operator shall be insulated from internal heat sources so that not more than 15 percent of the surface of the outer housing exceeds a temperature of 35 OF above the

27、ambient air temperature. Insulation shall be encased to hold the insulation in place and to prevent settling, crumbling, or flaking within the housing. Height Width 3.1.12 Phvsical size limitations. The unit shall pass or shall be provided with a means of r:-assembly so that it can pass through a sh

28、ipboard access measuring 26 x 66 inches with 8-inch radius corners and reassembled within the ship without hotwork such as welding and brazing. (Shipboard requirement, see 7.2) 1 80 2 I 90 I 40 I 52 50 68 3.2 Materials. 3.2.1 General. The tumbler-dryer shall be provided with a structural frame, base

29、, and strength members constructed of malleable iron, ductile iron, or steel. No brittle materials are to be used for these parts. The unit frame shall be constructed to provide rigid and durable support for housing, cylinder heating unit, fan motor, and driving mechanism. The tumbler-dryer 3 Provid

30、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- A-A-593b4 m 903054 0004537 933 m A-A- 5 9 3 64 - shall be free from asbestos and from cadmium parts or coatings in any form. Piping shall be constructed from stainless steel or copper. Fittings shall be cons

31、tructed from bronze. Valves shall be constructed from cast bronze. 3.2.2 Stainless steel . Stainless steel materials shall be in accordance with ASTM A167, type 302 or 304. Bolts, screws, nuts, or other parts used for securing stainless steel parts shall also be stainless steel. 3.2.3 CY lin-. 3.2.3

32、.1 -1 inder basket. The cylinder basket shall be perforated hot-dipped galvanized sheet steel in accordance with ASTM A123, or other materials with equal or better corrosion resistance, material strength, and heat strength characteristics. Surface coatings or finishes shall not stain the clothing wi

33、thin the cylinder basket. The back sheet of the cylinder basket shall be solid. The front sheet of the cylinder basket shall have a circular opening to match the protruding section of the door. The cylinder shall be driven by a steel cylinder drive shaft welded to a steel transmitter, which shall be

34、 bolted to the rear cylinder head. The cylinder shall be provided with lifting ribs equally spaced around the cylinder. Through tie-rods shall be installed within the lifting ribs to increase the rigidity of the cylinder. 3.2.3.2 Cv linder drive shaft. The cylinder drive shaft shall be hard, strong

35、steel to ensure safe and durable operation that will withstand ship-induced vibrations. The drive shaft shall be machined for a proper fit with the bearing sleeves at the back of the unit. 3.2.3.3 v linder bearinas. The cylinder shall be supported at the rear by two heavy-duty roller bearings. The b

36、earings r-. be readily renewable and be of sufficient capacity and durability to proviu,= rotation of the cylinder under full load conditions without vibration fx no: less than 5000 hours. 3.2.3.4 Transmitter . The transmitter shall have steel extensions extending to the full cylinder radius and sha

37、ll be securely bolted to the back sheet of the cylinder and welded to the cylinder drive shaft. 3.2.3.5 Drive adiustmen t. A means shall be provided for adjusting the cylinder alignment via the cylinder belts or chains. Means for adjustment shall be readily accessible. 3.2.4 Electrical tubular heati

38、na elements. tme 2. Tubular heating element sheath material on type 2 tumbler-dryers shall be made of monel-400 with hermetic ends sealed or material having equivalent corrosion resistance in a marine atmosphere and maximum operating temperature. The spiral wound resistor wire shall be made of 80 pe

39、rcent nickel and 20 percent chromium and suspended in the dielectric that shall be composed of compressed magnesium oxide. 3.3 Electrical recniirements . The unit shall operate on 440 VAC, 60 Hz, three-phase power, as defined in DOD-STD-1399, Section 300, and shall have provisions for making direct

40、(hardwired) connections for electric power (3 conductors) and for equipment grounding (1 conductor). All outermost metallic surfaces shall be grounded via the equipment grounding connection. The grounding resistance between any exposed metallic surfaces and the common ground point shall be not great

41、er than 0.1 ohm. Electrical components, other than the hermetically sealed motor, shall be provided in accordance with NEMA 250, Type 13 or equivalent enclosure protection. Metal parts of electrical components and enclosures shall be inherently corrosion resistant or shall be treated and processed f

42、or corrosion resistance in accordance with IEEE Standard 45. (Shipboard requirement, see 7.2) 3.3.1 Electric moto rs. The motors shall be in accordance with NEMA MG1. The motors shall function under all operating conditions without exceeding 4 Provided by IHSNot for ResaleNo reproduction or networki

43、ng permitted without license from IHS-,-,-A-A-593b4 H 9038054 0004538 87T II - permissible temperature rise. used. In addition, main drive Service Bearings Insulation Vo 1 tage Cooling Type Ambient temperature Enclosure Duty A-A-59364 The use of resilient motor mounts shall not be motors shall have

44、the following characteristics. C Bal 1 Class B or F 440 VAC, 60 Hz, three-phase Natural Squirrel cage induction 104 OF, maximum Dripproof Fan motor: Continuous Drive motor: Continuous reversing Maximum 4 reversals per minute Minimum 1 reversal per minute 3.3.2 Electric motor wire. Motors shall be wo

45、und with wire sizes conforming to the American Wire Gauge. Half size wire shall not be used. 3.3.3 Controllers. Motor controllers shall be of the magnetic type with overload protection relays. Motor controllers shall be provided with overload protection for motors of 1/8 horsepower or greater. Contr

46、ol circuits shall operate at 115 VAC. Reduced-voltage control circuits shall be protected by cartridge fuses and shall be sized not greater than 200 percent of the transformer kilovoltampere rating or 100 percent of the control wire amperage rating, whichever is smaller. Control buttons and switches

47、 shall be dripproof. Indicator lights for voltages in excess of 28 volts shall be of the transformer type with low-voltage lamps. Electrical components mounted outside the control panel shall be provided with dripproof enclosure lenoid valves shall be provided with high temperature epoxy encapsulate

48、d coiis. The control equipment shall have the following characteristics. Ambient temperature 104 OF Enclosure Dripproof Operation Manual or magnetic AC: across-line 3.3.4 Circuit breaker. A properly sized fuse disconnect box shall be installed on the 440 VAC electrical supply line. Properly sized fu

49、ses shall also be installed on the secondary side of the step-down transformer to protect the tumbler-dryer control circuitry. 3.4 Performance characteristics. 3.4.1 Drvina efficiencv . The tumbler-dryer shall remove moisture from clothes at the maximum load capacity, soaked with water to a wet weight of 150 percent of the maximum dry weight, at a water temperature of 70 f 2 F. The tumbler-dryer shall remove 97 percent of the water from the load at a drying rate of 1.2 pounds of water per minut