What is the main purpose of refrigerant piping?
Prevent excessive amounts of lubricating oil from being trapped in any part of the system; Protect the compressor at all times from loss of lubricating oil; Prevent liquid refrigerant or oil slugs from entering the compressor during operating and idle time; and.
What piping material is used for refrigerant?
Copper tube used for refrigerant piping erected on the premises shall be seamless copper tube of Type ACR (hard or annealed) complying with ASTM B280 or ASTM B819. Annealed temper copper tube shall not be used in sizes larger than a 2-inch (51 mm) nominal size.
Which piping code is used for refrigeration piping?
B31. 5 – Refrigeration Piping & Heat Transfer Components | ASME – ASME.
What are the two types of refrigerant lines?
Refrigerant Lines The larger line typically carries a cool gas and is insulated. This is commonly referred to as the suction line, but it is also called the return line or vapor line. The smaller uninsulated line typically carries a warm liquid. It is most often called the liquid line.
Why refrigerant pipe is insulated?
In refrigeration and air-conditioning applications, insulation needs to be able to protect against condensation. Moisture control is critical to thermal efficiency. If moisture intrudes the insulating material surrounding cold-water piping, thermal efficiency is lost.
What is the maximum length of refrigerant piping?
Length is general guide. Lengths may be more or less, depending on remaining system design factors. Maximum linear (actual) length = 200 feet. Maximum linear liquid lift = 60 feet.
How is refrigerant pipe measured?
Refrigeration tubing is measured by it’s outside diameter or O.D.: ¼, ½, 5/8, ¾, 7/8, 1-1/8, 1-3/8, 1-5/8, etc. Plumbing tubing is measured by it’s inside diameter or I.D. : 1/8, ¼, ½, ¾, 1, 1-1/4, 1-1/2, 1-3/4,etc.
What are the three major refrigerant lines?
These individual components are connected by refrigerant piping. The suction line connects the evaporator to the compressor, the discharge line connects the compressor to the condenser, and the liquid line connects the condenser to the expansion device.
How is refrigerant piping measured?
What should a properly designed and installed refrigerant piping system include?
A properly designed and installed refrigerant piping system should: • Provide adequate refrigerant flow to the evaporators, using practical refrigerant line sizes that limit pressure drop • Avoid trapping excessive oil so that the compressor has enough oil to operate properly at all times • Avoid liquid refrigerant slugging
What is the velocity of refrigerant in refrigeration piping?
Good refrigeration piping design requires that the refrigeration lines be pitched in the direction of flow at approximately 1/2 inch per 10 feet or 1 inch per 20 feet. Refrigerant velocities in vertical lines should be at least 1500 ft/min to ensure good oil return; velocities in horizontal lines should be at least 750 ft/min. Suva refrigerants ®
Why do we insulate refrigerant piping?
Why do we Insulate Refrigerant Piping? Maintain system capacity & efficiency. Avoid heat gains or losses. Prevent condensation on piping or insulation.
What type of refrigerant is used in commercial air conditioning?
Using This Guide This Guide covers R-22, R-407C, R-410A, and R-134a used in commercial air conditioning systems. It does not apply to industrial refrigeration and/or Variable RefrigerantVolume (VRV) systems. Illustrations and figures are not to scale.