Productos Nacobre manufactures copper tube in soft coils and hard drawn straight lengths. Nacobre’s refrigeration coils and ACR Tube are dehydrated, cleaned and capped (degreased) to ensure tube reaches customer in a pure, defect-free state. ACR tube is also suitable for medical gas systems according to ASTM B-280, B-819. Type K cleaned and capped (degreased) for use in medical gas systems is also available from Nacobre.
|Rated Internal Working Pressure (PSIG)|
|Standard Size – O.D.||Wall (inches)||WT/coil||Coils/Mater||150F||250F||350F||450F|
Values of allowable internal working pressure for copper tube in service are based on the formula from ANSI B-31, Standard Code for Pressure Piping:
|P=||2 S tm||P=||Allowable pressure||@ 150° F S=5100 PSIG annealed|
D – 0.8 tm
|S=||Allowable stress||@ 200° F S=4800 PSIG annealed|
|tm=||Wall thickness (min.)||@ 300° F S=4700 PSIG annealed|
|D=||Outside diameter||@ 400° F S=3000 PSIG annealed|
All ratings listed for Refrigeration Service Tube are calculated for tube in the annealed condition while ratings for Types K, L and M are shown in both annealed and drawn conditions. Annealed values should be used when soldering, brazing or welding is employed for joining components in a system. While the ratings for hard drawn tube are substantially higher, they should only be used for systems using properly designed flare or compression mechanical joints, since joining by any heating process might anneal (soften) the tube.
In designing a system, careful consideration should also be given to joint ratings as well as those of the components