2000 Hook-up Book

Clean Steam

Figure 59 Effective Condensate Drainage

Table 15: Saturated Steam Capacities — OD Tube Capacities in lb/h Tube Size (O.D. x 0.065 inch wall) Pressure Velocity psi ft/sec 1 / 4 " 3 / 8 " 1 / 2 " 3 / 4 " 1 1 1 / 2 " 2" 2 1 / 2 " 3" 50 — — 5 20 35 90 170 270 395 5 80 — 5 10 30 60 145 270 430 635 120 — 5 15 45 85 215 405 650 950 50 — 5 10 25 45 110 210 335 490 80 — 5 15 35 70 180 330 535 785 120 — 10 20 55 110 270 500 800 1175 50 — 5 10 30 60 155 285 460 675 80 — 10 20 50 100 245 460 735 1080 120 5 10 25 75 150 370 685 1105 1620 50 — 5 15 40 80 195 365 585 855 10 20 5 10 30 65 125 310 580 935 1370 5 15 35 95 190 465 870 1400 2050 50 — 10 15 50 95 235 440 705 1035 5 10 25 75 150 375 700 1125 1655 5 20 40 115 230 556 1050 1690 2480 50 — 10 20 55 110 275 515 825 1210 5 15 30 90 180 440 820 1320 1935 5 20 50 135 265 660 1235 1980 2905 50 — 10 25 65 125 315 590 945 1385 5 15 35 105 205 505 940 1510 2215 5 25 55 155 305 755 1411 2265 3325 5 15 30 80 160 395 735 1180 1730 5 20 45 130 255 630 1175 1890 2770 5 30 70 195 380 950 1764 2835 4155 5 15 35 95 190 470 880 1415 2075 5 25 55 155 305 755 1410 2265 3320 120 10 35 85 230 455 1135 2115 3395 4975 50 5 20 40 115 220 550 1030 1650 2420 5 30 65 180 355 885 1645 2640 3875 120 10 40 95 270 535 1325 2465 3965 5810 120 40 80 120 50 80 120 60 80 120 50 80 80 120 50 80 100 120 80 30 80

SYSTEM DESIGN

Steam Inlet

Process/ Medium

Drip Trap

Process Trap

Case in Action: Hospital Sterilizer

A hospital was experiencing continuing problems with a number of its sterilizers which were having an adverse effect on both the sterilization process itself and the amount of maintenance required to keep the units in ser vice. These problems included: • Ineffective sterilization • Prolonged sterilization cycles • Wet and discolored packs • Instrument stains, spotting and rusting • High maintenance of drain traps and controls • Dirty sterilizer chambers requiring frequent cleaning Solution In discussion with the hospital maintenance engineer, the Spirax Sarco Sales Representative offered the opinion that these problems were a result of a wet and contami nated steam supply. In a number of cases the steam supply to the sterilizers was unconditioned, allowing mois ture and solid particles, such as pipe scale and rust, to enter both the sterilizer jacket and chamber, resulting in the problems identified by the user. The solution was to install Spirax Sarco steam filter stations. Each steam filter station is comprised of: • An isolation valve to aid in maintenance. • A separator complete with strainer and drain trap to remove residual condensate and any entrained moisture being carried in suspension within the steam. • A main line strainer to remove larger solid particles. • A steam filter and drain trap combination.

The steam filter specified was a Spirax Sarco CSF16 fitted with a 1 micron absolute filter element. The cleanable CSF16 filter element ensured that 99% of all particles larg er than 0.1 microns were removed, while the thermostatic steam trap drained any condensate that formed in the filter body during operation and periods when the steam supply to the sterilizer was isolated. These installations resulted in steam supplies free of both moisture and solid particles. Benefits • Effective sterilization every time • Reduced sterilization cycles and improved productivity • High quality of packs and instruments without spots, stains or corrosion • Minimal re-work of sterilizer loads • Reduced cleaning and maintenance of sterilizer, drain traps and controls Cost Savings With the help of the hospital maintenance engineer, a steam filter station payback analysis sheet was completed. The estimated cost of maintenance, the cost associated with re-working wet or spotted packs, and the cost due to loss of performance were included in the payback calcula tion. In total, annual costs were over $25,000 for each sterilizer. Using this figure a payback period of less than two months was established for suitably sized Spirax Sarco steam filter stations.

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