18.1 For purpose of determining compliance with the specified limits for requirements of the properties listed in the following table, an observed value or a calculated value shall be rounded as indicated in accordance with the rounding method of Practice E29.

 
      Property

Rounded Unit for Observed or
Calculated Value

  Chemical composition

   nearest unit in the last

     right-hand significant
     digit used in expressing
     the limiting value

  Tensile strength

   nearest ksi [nearest 5 MPa]

  Elongation

   nearest 1 %

  Expansion

   nearest 1 %

  Grain size

   nearest multiple of 0.005 mm

This specification establishes the requirements for condenser, evaporator, and heat exchanger U-bends that are manufactured from seamless copper and copper alloy tube. The material of manufacture shall be of such quality and purity that the finished product shall have the properties and characteristics specified. The material shall conform to the chemical composition requirements specified. Tensile test, expansion test, flattening test, mercurous nitrate test or ammonia vapor test, nondestructive examination, hydrostatic test, and pneumatic test shall be made to conform to the requirements specified.

1.1 This specification2 establishes the requirements for condenser, evaporator, and heat exchanger U-bend tubes that are manufactured from seamless copper and copper alloy tube.

1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.3 This specification is applicable to product 2 in. [50 mm] or less, inclusive, in diameter.

1.4 The product shall be produced from one of the following coppers or copper alloys, as specified in the ordering information:

Copper or
Copper Alloy
UNS No.

Previously Used
Designation

Type of Metal

C10200

OF^A

oxygen-free without residual deoxidants

C10300

...

oxygen-free, extra low phosphorus

C10800

...

oxygen-free, low phosphorus

C12000

DLP^A

phosphorized, low residual phosphorus

C12200

DHP^A

phosphorized, high residual phosphorus

C14200

DPA^A

phosphorized, arsenical

C19200

...

phosphorized, 1 % iron

C23000

...

red brass

C44300

Type B

admiralty metal

C44400

Type C

admiralty metal

C44500

Type D

admiralty metal

C60800

...

aluminum bronze

C68700

Type B

aluminum brass

C70400

...

95-5 copper-nickel

C70600

...

90-10 copper-nickel

C70620

...

90-10 copper-nickel-
(modified for welding)

C71000

...

80-20 copper-nickel

C71500

...

70-30 copper-nickel

C71520

...

70-30 copper-nickel-
(modified for welding)

C72200

...

copper-nickel

1.5 The following safety hazard caveat pertains only to the test methods described in this specification.

1.5.1 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. (Warning—Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury containing products. See the applicable product Safety Data Sheet (SDS) for additional information. Users should be aware that selling mercury and/or mercury containing products into your state or country may be prohibited by law.)