10.5 Recirculated Heating There are two (2) options that can replace the standard Electric Heater (Standard) option for heating the recirculation system’s cleaning solution:
• Heat Exchanger – Steam • No Recirculated Heating
The Heat Exchanger – Steam option removes the electric heater assembly in the standard system and replaces it with a skid-mounted shell and tube heat exchanger system for heating the recirculation system The following components are added: • One (1) Steam heat exchanger with the following specifications: − Duty: See Table 10: Steam Heat Exchanger Data − Material: 316L stainless steel wetted surfaces / 304 stainless steel non-wetted surfaces − Design: Shell & tube − Rating: ASME − One (1) Pressure gauge with 0-100 psi range, anti-siphon, and manual block valve − One (1) Modulating control angle-seat valve with pneumatic actuator and positioner − One (1) Pressure relief valve (set at 125 psi) piped to the floor − One (1) Vacuum breaker with brass construction − Piping constructed of non-insulated SCH 80 carbon steel weld pipe and socket fittings with all carbon steel pipe and welds covered in high-temperature black paint • One (1) Condensate return piping manifold consisting of: − One (1) Manual ball valve for a condensate drain − One (1) Float and thermostatic steam trap − Piping constructed of non-insulated SCH 80 carbon steel weld pipe and socket fittings with all carbon steel pipe and welds covered in high-temperature black paint − Connections: Tri-clamp (sanitary) / NPT (non-sanitary) • One (1) Steam supply return piping manifold consisting of: − One (1) Y-strainer with blow-off valve
Table 10: Steam Heat Exchanger Data
Skid Dimensions Approx. Heat-up Time 68 ° F to 140 ° F (min) W" D" H"
Connection Size / Type (Steam Supply)
Connection Size / Type (Condensate Return)
Chamber Model
Load (lbs/hr)
2 " FLG 2 " FLG
1 5 " FLG 1 5 " FLG
PC335
20 50 70
3
966
PC365
20 50 70
6
966
NOTE: • Sani-Matic standard is to design steam heating applications for 50 psi steam For installations where the plant-supplied steam is more than 50 psi, a pressure reducing valve (PRV) may be required to be installed (by others)
The No Recirculated Heating option removes the electric heater assembly in the standard system’s recirculation piping This option is intended for applications where the supply water temperature is adequate for washing cycles
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TD-0008.3
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