capillary tubing - kielmann

T e c h n i c a l G u i d eC a p i l l a r y T u b i n g

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T E C H N I C A L G U I D E

C A P I L L A R Y T U B I N G

T h a n k y o u f o r c h o o s i n g o u r p r o d u c t s

w w w . k i e l m a n n o n l i n e . c o m

Rev. 00 04-14


• Standard copper capillary tube• Soft temper

• According to ASTM B360• Presented in coils of 100 ft. (30.48m) length

the evaporator during the halt of the system.When the compressor stops, the pressure on the low and high side is equalized through the open capillary tube and the liquid residue in the condenser is passed into the evaporator (lower pressure), where it is evaporated at a slower pace until the compressor cycle starts again.

The capillary tubes are used in refrigeration and air conditioning systems. Specific applications include, but are not limited to, appliances, heat exchangers, boilers, measuring and control systems, domestic refrigerators, and small climate control systems.


FEATURES

The capillary tube is the simplest expansion device, consisting of only one small diameter copper tube, which retains at its exit the flow of liquid refrigerant to the evaporator in a refrigeration circuit. This restriction not only helps to reduce the pressure at the exit of the condenser and maintain the operation’s pressure differential required at this stage of the system, but also regulates the refrigerant flow from the condenser to the entry of the evaporator, a flow necessary to optimize the system’s operation capacity and the required cooling level.The capillary tube differs from other types of refrigerant flow control, as it does not close or stop the liquid flow to

NOMENCLATURE

1 Letter = Model (presentation)

3 Digits = O.D. (outside diameter in inches)

(C) = Capillary Tube

(CT) = Copper Tube

(K) = Manufacturer :

K CT - C (XXX) (Y)



Rev. 00 04-14


ADVANTAGES OF USING CAPILLARY TUBING

MODELS

ReferenceOutside Diameter (O.D.) Inside Diameter (I.D.) Width(Inches) (mm) (Inches) (mm) (Inches) (mm)

KCT-C026A 0.072 1.83 0.026 0.660 0.023 0.584KCT-C028A 0.072 1.83 0.028 0.711 0.022 0.558KCT-C031A 0.081 2.06 0.031 0.787 0.025 0.635KCT-C033A 0.081 2.06 0.033 0.838 0.024 0.609KCT-C036A 0.087 2.21 0.036 0.914 0.0255 0.648KCT-C039A 0.087 2.21 0.039 0.991 0.024 0.609KCT-C042A 0.093 2.36 0.042 1.07 0.0255 0.648KCT-C046A 0.097 2.46 0.046 1.17 0.025 0.635KCT-C049A 0.099 2.51 0.049 1.24 0.025 0.635KCT-C054A 0.106 2.69 0.054 1.37 0.026 0.660KCT-C059A 0.112 2.84 0.059 1.50 0.0265 0.673KCT-C064A 0.125 3.18 0.064 1.63 0.0305 0.775KCT-C070A 0.125 3.18 0.070 1.78 0.0275 0.699KCT-C075A 0.125 3.18 0.075 1.91 0.0250 0.635KCT-C080A 0.145 3.68 0.080 2.03 0.0325 0.826KCT-C130A 0.188 4.78 0.130 3.30 0.029 0.737KCT-C145A 0.200 5.08 0.145 3.68 0.0275 0.699KCT-C160A 0.220 5.59 0.160 4.06 0.030 0.762KCT-C175A 0.240 6.10 0.175 4.45 0.0325 0.826

• Simplicity• Reliability: no moving parts

• Easy to repair• No fluid reservoir required

DISADVANTAGES OF USING CAPILLARY TUBING

• Rigidity: It does not allow refrigerant flow be adapted to the variations of thermal load and room temperature

Note: Average tolerance for Outside Diameter: 0.03mm; Average tolerance for Inside Diameter: 0.02mm



Rev. 00 04-14


UNDERSTANDING COPPER…

The information below is a summary of ASTM standard, which does not include the whole text of the standard, and it is used for general knowledge only. User is responsible for establishing the appropriate safety, sanitation and health practices. Refer to regulations of each country before using the materials.

ASTM B88

This standard’s specifications cover seamless copper water tubes suitable for use in the conveyance of fluids. These water tubes made of copper alloy type UNS No. C10200, C12000 and C12200 are usually used with solder joints, screwed or the compressible type. Materials should be cold-drawn to the size required, and when tubes are cold-worked and annealed, the required hardness and surface finish are obtained. Copper tubing is supplied in coils and annealing is performed after coiling. Straight copper tube is drawn in rigidity.

ASTM B280

This standard’s specifications cover seamless copper UNS No. C10200, C12000 and C12200 tubes for use in air conditioning and refrigeration units. Materials manufactured in hot or cold working processes, form an evenly forged homogenous structure. Each tube shall be cold-drawn to the finished size and wall thickness.

Coiled soft temper material shall be bright annealed after coiling, then dehydrated and capped, plugged, pressed, or otherwise closed at both ends. Hard-drawn temper material shall be cleaned, and capped, plugged, or closed otherwise at both ends.

Density, tensile properties and test results of circulating currents (Eddy Current Test), as well as cleanness shall be adjusted to values mentioned in the standard.

THE RIGHT SELECTION

Factors to be considered when selecting the tube include: application area, fluid that will circulate through the tube, pressure of circulating fluid and ambient pressure, service conditions and local regulations and laws. Finally, the form of joining the sections may also influence in the selection.

UNS TYPEST

UNS Copper No. Previous Designation Description

C10200 OF Oxygen-free, no deoxidizing residues

C12000 DLP Deoxidizing-free phosphorus, low phosphorus residues

C12200 DHP Deoxidizing-free phosphorus, high phosphorus residues



Rev. 00 04-14


TYPES OF TUBES AND THEIR TECHNICAL FEATURES

Tubes identified as types K, L, M, DWV and Medical Gas have effective outside diameters, which are 1/8 inch (0,125 inch) larger than the standard sizes for which the-se tubes are known. For example, a ½ inch type M tube has an actual outside diameter of 5/8 inches. Type K tu-bes have walls thicker than type L, and the latter in turn have thicker walls than type M tubes for any diameter considered.

ACR tubes used for air conditioning and refrigeration services and G/GAS tubes used in natural and propane gas transporting systems are designated by their effecti-ve outside diameter. For instance, a ½ inch G/GAS tube has an actual outside diameter of ½ inch.Tubes are rigid and flexible temper worked (hardness grade), with different lengths. The most common are:

RIGID TYPE K TUBES (marked in green)

• Rigid tube in straight lengths of 20 ft. / 6.10 m • Application: for circulation of fluids and high pressure gases in industrial environments, for oxygen and

vapor, among others

RIGID TYPE L TUBES (marked in blue)

• Rigid tube in straight lengths of 20 ft. / 6.10 m• Application: for circulation of cold and hot water with pressures higher than normal in commercial

environments such as hotels and clinics, for natural gas, liquefied petroleum, heating, cooling, oxygen, among others

RIGID TYPE M TUBES• Rigid tube in straight lengths of 20 ft. / 6.10 m• Application: for circulation of cold and hot water with normal pressures in residential and commercial

environments

RIGID TYPE OXY/MED COPPER TUBES

• Rigid tube in straight lengths of 20 ft. / 6.10 m• Application: medical gas systems and facilities

FLEXIBLE COPPER TUBES FOR REFRIGERATION

AND AIR CONDITIONING

• Flexible tube in coils of 15.24 m (50 ft.) or 30.48 m (100 ft.)• Application: refrigeration and air conditioning units

COPPER CAPILLARY TUBES• Packaging: coils• Application: used in refrigeration, air conditioning and gas units, as well as original equipment

manufacturers (OEM´s)

FLEXIBLE LEVEL WOUND COIL (LWC) COPPER TUBES

• Packaging: reels (coils with cardboard reels) and bulk (coils with cardboard separators)• Maximum coil weight: 170 kg. (375 lb.) for reel and 250 kg. (550 lb.) for bulk• Application: manufacturing of refrigeration and air conditioning units

FLEXIBLE LEVEL WOUND INNER GROOVED

(IGT) TUBES

• Packaging: bulk (coils with cardboard separators)• Maximum coil weight: 250 kg. (550 lb.)• Application: seamless LWC tubes manufactured with inner grooved walls that increase refrigerant gas turbulence for higher heat transfer efficiency reducing power consumption. It is mainly used in the manufacturing of refrigeration and air conditioning units



Rev. 00 04-14


ADVANTAGES OF USING COPPER TUBES ARE

LightweightCompared with iron tubes, copper tubes are a lightweight construction material, which also facilitates transport. Their manufacturing by extrusion allows tubes with thinner walls maintaining their resistance to pressure.

Easy installation Copper tubes are easy to bend, adapting to conditions of space.

Easy to join Alternatives to join copper tubes in a leak-free manner include soldering, brazing, mechanical couplings and adhesives.

Corrosion resistanceCopper is resistant to a large number of substances and when in contact with water, it does not form voluminous oxide scabs or other compounds, which could obstruct the tubes. A thin layer of oxide that forms and penetrates the metal helps protecting it and provides longevity.

Good thermal conductivity Copper is a very good heat conductor, therefore it is the ideal material for manufacturing coils for hea-ting, air conditioning and refrigeration.

Low pressure drop Copper and copper-alloy tubes have a high surface quality (very smooth), as well as a high corrosion resistance. Therefore, they have little pressure loss, as they offer low resistance to the passage of the fluids.

Pressure resistanceThe production process by extrusion prevents seam formation avoiding possible leaks. This process allows obtaining thinner tubes compared to other metals, without losing resistance to pressures generated in the application.

Increased capacity Compared to plastic or steel tubes of the same diameter, copper tubes have larger water transport capacity.

High safetyIn case of fire, metals of the copper family do not spread flames to the atmosphere and walls, or to the floor, or from one floor to another, and they do not decompose by heat, producing highly poisonous gases, as plastics do. Due to the flames the copper tubes will neither consume nor stop water circulation.

Waterproof Welded copper tubes are completely waterproof preventing the penetration of substances, such as oils, insecticides, benzene, among others. Copper protects your health.

No germ proliferationScientific studies show that the bacterial content in drinking water transported through copper tubes is re-duced to zero after 5 hours in contact with copper tube. Due to its bactericidal and fungicidal properties copper is the ideal material for handling and storing water.

High residual valueConsolidated copper obtained from scrap copper has the same quality as the refined one, from mining production, therefore, copper or copper-alloy tubes have a high residual value. Since they can be re-cycled as raw material, they constitute an ecological solution for the future of the planet.


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T E C H N I C A L G U I D E

capillary tubing - kielmann

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