Metallic Hose Assemblies - Thorburn Flex Inc

Metal HoseTechnical DataTEMPERATURE CORRECTION FACTORSFOR REDUCING PRESSURETemperatureMaterialF o St. steel Steel Monel Bronze70 1.00 1.00 1.00 1.00150 .97 .99 .93 .92200 .94 .97 .90 .89250 .92 .96 .87 .86300 .88 .93 .83 .83350 .86 .91 .82 .81400 .83 .87 .79 .78450 .81 .86 .77 .75500 .78 .81 .73600 .74 .74 .72700 .70 .66 .71800 .66 .52 .70900 .62 .501000 .601100 .581200 .551300 .501400 .441500 .40MAXIMUM SERVICE TEMPERATUREAlloy Maximum Alloy Maximumtemp. F otemp. F oANSI stainless steeltype:321 1500316 ELC 1500304L 1500304 & 316 850302 850Mild steel 850Malleable iron 800Monel 800Bronze 450Brass 450Copper 400Brazing (RCuZn-Cor BCuP-2):Bronze hose 450Steel Hose 850Silver brazing(AWS-BAg-2) 600Asbestos packinggrade:Commercial 450Underwriters 450Aluminum 52S-0(5052-0) 600Galvanizing 450Soft solder:(Pb: 60, Sn: 40) 250(Pb: 95, Sn: 5) 350COEFFICIENTS FOR INCREASINGBEND RADIUS AT ELEVATED TEMPERATURESTemperature F oBend radius70 1.00210 1.10300 1.25400 1.30570 1.40750 1.50930 1.601110 1.80Shock PressureWhen pulsating, surge or shock pressures exist, these havea marked effect on the service life of metal hoses. If thissituation is encountered, the peak pressure must not exceed50% of the maximum working pressure.Flow VelocityHigh velocities in corrugated hose should be avoided as thecorrugations could be forced into resonant vibrations resultingin premature fatigue failure. Where the flow velocityexceeds 100 ft/sec for gas or 50 ft/sec for liquid in unbraidedhose and 150 ft/sec for gas or 75 ft/sec for liquid in braidedhose, an interlock hose should be used as a liner. When thehose is installed in a bent condition, these flow values shouldbe reduced by 50% for a 90 o bend, 25% for a 45 o bend andso on, proportionally to the angle of bend. Where velocityexceeds the above values, the next lager size of hose withliner should be used.Pressure LossAs a rough estimate, it can be assumed that the pressureloss in corrugated hoses is 100% higher than in new weldedsteel pipes, and in stripwound hoses it is 20% higher. Thismeans that in the case of corrugated hoses an increase indiameter of 15% and in the case of stripwound hoses of only4% is sufficient to reduce the pressure loss to the value ofthe pressure loss in steel pipes. For more accurate calculations,consult Thorburn engineering with application details.SATURATED STEAM PRESSURE - TEMPERATURESaturated steam Saturated steam Saturated steam Saturated steampressure PSIG Temp. F o pressure PSIG Temp. F o pressure PSIG Temp. F o pressure PSIG Temp. F oVACUUM HG-- 0 0 212 150 366 450 46029.84 20 10 238 175 377 475 46529.74 32 20 259 200 388 500 47029.67 40 30 274 225 397 550 48029.39 60 40 287 250 406 600 48928.89 80 50 298 275 414 700 50527.99 100 60 307 300 422 800 52026.48 120 75 320 325 429 900 53424.04 140 80 324 350 436 1000 54620.27 160 90 331 375 442 1250 57414.63 180 100 338 400 448 1500 6066.46 200 125 353 425 454 2500 66917