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HVACR316 - PipingHVACR316 - Piping

Related CodesTrade Math I

Related CodesTrade Math I

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Related CodesRelated Codes

• GENERAL : All refrigerant piping shall be installed, tested and placed in operation in accordance with code.

• PIPE ENCLOSURES : Rigid or flexible metal enclosures or pipe ducts shall be provided for soft, annealed copper tubing and used for refrigerant piping erected on the premises and containing other than Group A1 or B1 refrigerants.

• GENERAL : All refrigerant piping shall be installed, tested and placed in operation in accordance with code.

• PIPE ENCLOSURES : Rigid or flexible metal enclosures or pipe ducts shall be provided for soft, annealed copper tubing and used for refrigerant piping erected on the premises and containing other than Group A1 or B1 refrigerants.

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• Condensation : All refrigerating piping and fittings, brine piping and fittings that, during normal operation, will reach a surface temperature below the dew point of the surrounding air, and are located in spaces or areas where condensation will cause a safety hazard to the building occupants, structure, electrical equipment or any other equipment or appliances, shall be protected in an approved manner to prevent such damage.

• Condensation : All refrigerating piping and fittings, brine piping and fittings that, during normal operation, will reach a surface temperature below the dew point of the surrounding air, and are located in spaces or areas where condensation will cause a safety hazard to the building occupants, structure, electrical equipment or any other equipment or appliances, shall be protected in an approved manner to prevent such damage.

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Related CodesRelated Codes

• MATERIALS FOR REFRIGERANT PIPE & TUBE• Steel Pipe : Carbon steel pipe with a wall

thickness not less than Schedule 80 shall be used for Group A2, A3, B2 or B3 refrigerant liquid lines for sizes 1.5 inches and smaller.

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• MATERIALS FOR REFRIGERANT PIPE & TUBE• Steel Pipe : Carbon steel pipe with a wall

thickness not less than Schedule 80 shall be used for Group A2, A3, B2 or B3 refrigerant liquid lines for sizes 1.5 inches and smaller.

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• Carbon steel pipe with a wall thickness not less than Schedule 40 shall be used for Group A1 or B1 refrigerant liquid lines 6 inches or smaller, Group A2, A3, B2 or B3 refrigerant liquid lines sizes 2 inches through 6 inches and all refrigerant suction and discharge lines 6 inches or smaller.

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• Carbon steel pipe with a wall thickness not less than Schedule 40 shall be used for Group A1 or B1 refrigerant liquid lines 6 inches or smaller, Group A2, A3, B2 or B3 refrigerant liquid lines sizes 2 inches through 6 inches and all refrigerant suction and discharge lines 6 inches or smaller.

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• Copper tube : Copper tube used for refrigerant piping erected on the premises shall be seamless copper tube of Type ACR (hard or annealed) complying with ASTM B 280. Where approved, copper tube for refrigerant piping erected on the premises shall be seamless copper tube of Type K,L or M (drawn or annealed) in accordance with ASTM B 88. Annealed temper copper tube shall not be used in sizes larger than a 2 inch nominal size.

• Copper tube : Copper tube used for refrigerant piping erected on the premises shall be seamless copper tube of Type ACR (hard or annealed) complying with ASTM B 280. Where approved, copper tube for refrigerant piping erected on the premises shall be seamless copper tube of Type K,L or M (drawn or annealed) in accordance with ASTM B 88. Annealed temper copper tube shall not be used in sizes larger than a 2 inch nominal size.

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Related CodesRelated Codes

• Copper tubing joints : Copper tubing joints used in refrigerating systems containing Group A2, A3, B2 or B3 refrigerants shall be brazed. Soldered joints shall not be used in such refrigerating systems.

• Copper tubing joints : Copper tubing joints used in refrigerating systems containing Group A2, A3, B2 or B3 refrigerants shall be brazed. Soldered joints shall not be used in such refrigerating systems.

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Related CodesRelated Codes

• Aluminum tubing : Type 3003-0 aluminum tubing with high pressure fittings shall not be used with methyl chloride and other refrigerants known to attack aluminum.

• Aluminum tubing : Type 3003-0 aluminum tubing with high pressure fittings shall not be used with methyl chloride and other refrigerants known to attack aluminum.

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Related CodesRelated Codes

Joints & Refrigerant Containing Parts in Air ducts

Joints and all refrigerant containing parts of a refrigerating system located in an air duct of an air conditioning system carrying conditioned air to and from humanly occupied space shall be constructed to withstand, without leakage, a pressure of 150 percent of the higher of the design pressure or pressure relief valve setting.

Joints & Refrigerant Containing Parts in Air ducts

Joints and all refrigerant containing parts of a refrigerating system located in an air duct of an air conditioning system carrying conditioned air to and from humanly occupied space shall be constructed to withstand, without leakage, a pressure of 150 percent of the higher of the design pressure or pressure relief valve setting.

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Related CodesRelated Codes

• Exposure of Refrigerant Pipe Joints: Refrigerant pipe joints erected on the premises shall be exposed for visual inspection prior to being covered or enclosed.

• Exposure of Refrigerant Pipe Joints: Refrigerant pipe joints erected on the premises shall be exposed for visual inspection prior to being covered or enclosed.

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Related CodesRelated Codes

• Stop Valves : All systems containing more than 6.6 pounds of a refrigerant in systems using positive displacement compressors shall have stop valves installed as follows

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• Stop Valves : All systems containing more than 6.6 pounds of a refrigerant in systems using positive displacement compressors shall have stop valves installed as follows

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• 1) At the inlet of each compressor, compressor unit or condensing unit.

• 2) At the discharge outlet of each compressor, compressor unit or condensing unit and of each liquid receiver.

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• 1) At the inlet of each compressor, compressor unit or condensing unit.

• 2) At the discharge outlet of each compressor, compressor unit or condensing unit and of each liquid receiver.

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• Exceptions : • 1) Systems that have a refrigerant pump out

function capable of storing the entire refrigerant charge in a receiver or heat exchanger

• 2) Systems that are equipped with provisions for pump out of the refrigerant using either portable or permanently installed recovery equipment.

• 3) Self contained systems.

• Exceptions : • 1) Systems that have a refrigerant pump out

function capable of storing the entire refrigerant charge in a receiver or heat exchanger

• 2) Systems that are equipped with provisions for pump out of the refrigerant using either portable or permanently installed recovery equipment.

• 3) Self contained systems.

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Trade MathTrade Math

• How to write and read decimals.• Fractions such as 2/10 and .2 are both read

the same, two tenths. When there is one figure at the right of the decimal point, we read the decimal as tenths. If there are two figures at the right of the decimal point, the decimal is in hundredths, three figures thousandths, four figures ten thousandths.

• How to write and read decimals.• Fractions such as 2/10 and .2 are both read

the same, two tenths. When there is one figure at the right of the decimal point, we read the decimal as tenths. If there are two figures at the right of the decimal point, the decimal is in hundredths, three figures thousandths, four figures ten thousandths.

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Trade MathTrade Math

• FRACTION DECIMAL• 2/10 .2 Two Tenths• 2/100 .02 Two

Hundredths• 2/1,000 .002 Two

Thousandths• 2/10,000 .0002 Two Ten

Thousandths

• FRACTION DECIMAL• 2/10 .2 Two Tenths• 2/100 .02 Two

Hundredths• 2/1,000 .002 Two

Thousandths• 2/10,000 .0002 Two Ten

Thousandths

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Trade MathTrade Math

• Write the following common fractions as decimals

• 3/10• 75/1,000• 31/10,000• 46/100• 888/1,000• 72/100• 82/1,000

• Write the following common fractions as decimals

• 3/10• 75/1,000• 31/10,000• 46/100• 888/1,000• 72/100• 82/1,000

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Trade MathTrade Math

ANSWERS.3.075.0031.46.888.72.082

ANSWERS.3.075.0031.46.888.72.082

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Trade MathTrade Math

• Change the following into fractions.• 1) A dowel is .5 inches in diameter• 2) A strip of sheet metal is cut so it is .907

inches wide• 3) The thickness of a template is .145 inches • 4) An insulated wire has a diameter of .091

inches• 5) The insulation around a wire is .0305

inches

• Change the following into fractions.• 1) A dowel is .5 inches in diameter• 2) A strip of sheet metal is cut so it is .907

inches wide• 3) The thickness of a template is .145 inches • 4) An insulated wire has a diameter of .091

inches• 5) The insulation around a wire is .0305

inches

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Trade MathTrade Math

• Answers• 1) 5/10• 2) 907/1,000• 3) 145/1,000• 4) 91/1000• 5) 305/10,000

• Answers• 1) 5/10• 2) 907/1,000• 3) 145/1,000• 4) 91/1000• 5) 305/10,000