1993 STANDARD for
AMMONIA COMPRESSOR UNITS
I Standard 510 I AIR-CONDITIONING & REFRIGERATION INSTITUTE
4301 NORTH FAIRFAX DRIVE
SAFETY RECOMMENDATIONS It is strongly recommended that the product be designed, constructed, assembled and installed in accordance with nationally recognized safety requirements, appropriate for products covered by this standard.
ARI, as a manufacturersâ€™ trade association, uses its best efforts to develop standards employing state-of-the-art and accepted industry practices. However, ARI does not certify or guarantee safety of any products, components or systems designed, tested, rated, installed or operated in accordance with these standards or that any tests conducted under its standards will be non-hazardous or free from risk.
This standard supersedes ARI Standard 510-87
Pnce $12.50 Pnnted in U.S.A.
@Copyright 1993, by Air-conditioning and Refrigeration Institute.
Registered United States Patent and Trademark
TABLE OF CONTENTS SECTION
Section 1. Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section 2. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I Section 3. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section 4. TestingRequirements Section 5. RatingRequirements
Section 6. NameplateMarkingInstructions
Section 7. VoluntaryConformance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TABLES Table 1.
ARIStandardRatingConditionsforAmmoniaCompressor Units (Based on 90째F [32,2"C] Ambient Temperature and No Liquid Subcooling Except for Booster and Compound Units)
ARI STANDARD 510-93
AMMONIA COMPRESSOR UNITS 3.2.2 Rotary Screw Compressor. A positive displacement compressor in which mating screws or a single screw with sliding gate rotor are used for displacement purposes.
Section 1. Purpose 1.1 Purpose. The purpose of this standard is to establish, for ammonia compressor units of the types described in Section 3: definitions, methods of testing and rating, including Standard Rating Conditions; nameplate requirements; and conformance conditions.
3.2.3 Rotary Vane Compressor. A positive displacement ammonia compressor in which an eccentrically located rotor with a vane or vanes is used for displacement purposes.
1.1.1 Intenl. This standard is intended for the guidance ofthe industry, including manufacturers, distributors, installers, contractors and consumers.
3.2.4 Booster Compressor. A compressor applied to low stage(s) of a multi-stage refrigeration system.
1.2 Review. This standard is subject to review and amendment ;ISthe technology advances.
Section 2. Scope 2.1 Scope. This standard applies to positive displacement ammonia compressor units for useincommercialand industrial refrigeration applications. 2.1.1 Refrigerant. This standard applies to compressors andunitsusing ammonia (R717), as defined in ANSI/ASHRAE 34-92, Number Designation and Safety Class#cations of Refrigerants (American Society of Heating, Refrigerating and Air-conditioning Engineers, Inc.).
Section 3. Definitions 3.1 Definitions in ASHRAE Terminology of Heating, Ventilating, Air-conditioning and Refrigeration apply except as indicated bythe definitions following in this section.
3.2.5 Internally Compounded Compressor. A compressor in which compression is accomplished in two or more stages, within the same compressor body. 3.3 Positive Displacement Ammonia Compressor Unit. A combinationof any of the above positive displacement compressors with or without prime mover(s) mounted on a structural base with accessories, such as strainers, service valves, check valves, suction filters, oil separators, etc., as provided by the manufacturer. Published Rating. A statement of the assigned values of those performance characteristics, under stated rating conditions, bywhich a unitmay be chosen to fit its application. These values apply to all units of like nominal size and type (identification) produced by the same manufacturer.
3.4.1 Standard Rating. A rating based on tests performed at Standard Rating Conditions. 3.4.2 ApplicationRating. A rating basedon tests performed at application rating conditions (other than Standard Rating Conditions).
3.2 Positive Displacement Ammonia Compressor. A compressor in which an increase in ammonia vapor pressure is attained by changing the internal volumeof the compression chamber. The compressor may have service valves supplied by the manufacturer.
3.5 Manufacturer. For the purpose ofthis standard, the company or organization which evidences its responsibility by affixing its name or its nationally registered trademark or trade name to the compressor or compressor unit.
3.2.1 ReciprocatingPistonCompressor. A positive displacement ammonia compressor in whichpistons are moved in cylinders by means of rods connected to a crankshaft with a fully-enclosed crankcase subjected to refrigerant pressure.
3.6 Refrigerating Capacity. For the purpose of this standard, refrigerating capacity is the capacity in tons [kWl obtained at specific conditions; it is equal to the increase in total enthalpy between the liquid ammonia and the ammonia vapor, at these conditions, multiplied by the mass flow rate of the ammonia.
ARI STANDARD 510-93 3.7 Power. I n p ~ t . Power input isthecompressor shaft powcr, HP [kW] (if prime mover is not supplied) and is the kilowatt input to thc motor for open or hermetic drives (in kW). 3.8 Efliuiency. The efficiency ofan'ammonia compressor is cxprcssed in power per ton:
Section 4. Testing Requirements 4.1 Testingf o r Rating of Positive Displacement Ammonia Compressor Units. The compressor unit shall be tested for rating in accordance with ASHRAE Standard 23-78, Methods of Testing f o r RatingPositiveDisplacement RefrigerantCompressors (American Society of Heating, Refrigerating and Air-conditioning Engineers, Inc.).
k W input
tons refrigeration effect
kW r e f r i g e r a t i o n e f f e c t kW input
3.9 "Shull," "Should," "Recommended" "It or Is Recot}lnzended." "Shall," "should," "recommended" or "it is rccommended" shall be interpreted ;I$ follows: 3.9.1 Shulf. Wherc "shall" or "shall not"isusedfor a provision specified, thatprovision is mandatory if compliance with the standard is claimed.
Section 5. Rating Requirements 5.1 Standard Rating of AnAmmoniaCompressorUnit. A Standard Rating of an ammonia compressor unit with all mounted accessories supplied by the manufacturer consists of a capacity rating, power input rating andefficiency rating, identified at its ARI Standard Rating Condition and Group Number from table 1. The actual compressor speed (rpm)[rev/s] at rated conditions shall be stated. 5.2 Application Rating of an Ammonia Compressor Unit. An application rating of an ammonia compressor unit with allmounted accessories supplied by the manufacturer consists of a capacity plusits power requirement, efficiency and speed at completely stated conditions other than those presented in table 1.
3.9.2 Should, Recommendedor It Is Recommended. "Should," "recommended" or "it is recommended" is uscd to indicate provisions which are not mandatory but which ;uc dcsirable ;ISgood practice.
Table 1. ARI Standard Rating Conditions for Ammonia Compressor Units (Based on 90째F [32.2OC] Ambient Temperature and No Liquid Subcooling Except for Booster and Compound Units)
Saturated Suction Temperature
Group No. -
A B C -40*D -40**E
20 5 - 10 -40 -40
-1.1 -6.7 -1s -23.3
*Compound Compressor Unit **Booster Compressor Unit
Return Gas Temperature O F
30 15 0 -30 -30
-9.4 -17.8 35 -34.4 -34.4
Saturated Discharge Temperature OF
95 95 95 95 10
Liquid Temperature Above Interstage Saturation Temperature (temperature difference)
35 35 3s
Not Applicable Not Applicable Not Applicable 10 10
Not Applicable Not Applicable Not Applicable 5.6 5.6
ARI STANDARD 510-93 5.3 Tolcrarrces 011 the Standard Rutirzgs. To comply with this standard, Standard Ratingsfor any production unit shall have an allowance for testing and manufacturing variations. The amount of tolerance for capacity and efficiency shall not be lower than minus S percent and the al1ow;tncefor powcrinputshall be no morethanplus S percent of thc rated values.
Manufacturer’s c. identification number number) d. Refrigerant e. Maximumdesignworking pressurc f. Maximumpermissible speed
Section 7. Voluntary Conformance Section 6. Nameplate Marking Instructions 6.1 Nonzeplute Murkirlg. Each compressor unit shall have an affixed nameplate onwhich a t leastthefollowing inl’ormation shall be marked: 11.
7.1 Corfornzunce. Whileconformancewith this standard is voluntary, confonnance shall not be claimed or implied for products or equipment within itsPurpose (Section 1) or Scope (Section 2) unless suchclaims m e t a l l of the reyuirerncnts o f the stan&ud.