Document QJQZ1xEBZqVwngwL42yXDwbx8

ROTH turbine boiler feed pumping units are a lino of factory assembled systems for boilers from 40 to 500 HP operating at pressures up to 200 PSI. Fac tory assembly reduces costly erection labor on the job site arid insures factory responsibility for the proper selection and function of the entire unit. ROTH boiler feed units consist of one or more motor driven pumps combined with a hot water storage tank or receiver and an automatic make-up valve to replace system losses. These units are used with most fire tube and scotch marine boilers when operated for process steam at pressures above 20 PSI. They are also used in modified form with water tube boilers. The motor driven pump operates intermittently and is controlled by a special float switch or pump con troller mounted on the. boiler water column, start ing the pump at low water level and stopping it at high water level. Water pumped from the vented receiver is usually at least 70% hot condensate and varies from 180F up to boiling point, depending on the amount of flash steam returned. Boiler feed pumps with low suction head tend to lose capacity as water temperature approaches 212F. By lowering the suction head to zero and raising the water temperature to 212F it is pos sible to vapor lock any turbine or centrifugal pump. For this reason the buyer should be protected against hot water fall-off by performance guaran tees in which suction head and temperatures are ~ clearly stated as in the selection table (see page 4). AU pump models furnished with ROTH Boiler Feed Units are thoroughly charted for performance in handling water close to boiling point and are rated for their capacity at 206F. In addition to certified hot water performance, ROTH engineering has resulted in many other de sign improvements assuring long, dependable opera tion. By eliminating ball bearing end-play, impeller position is permanently maintained. The new ROTH pumps have heavier shafts than any pre viously manufactured equipment and are covered by a written guarantee (see page 12). Other components of ROTH Boiler Feed Unite are manufactured with equal care. Welded steel receiv ers are of 3/16 inch copper-bearing steel and in ternally coated with a rust-resistant phenolic resin O 1953 -- Her E. Jtotfe Company 2 SEE PAGE TWELVE lining. Large diameter piping between receiver and pump eliminates pressure drop and includes a large strainer especially made for use on these units. Me chanical make-up valve for receivers up to 100 gal lon capacity is float operated. A solenoid valve controlled by a float switch is supplied for units with 180, 250, 350, and 500 gallon receivers. Available at additional cost are the following items: (1) Separable tank cradles instead of welded legs available on all sizes. (2) Dished head receivers made to 75 lb. ASME specifications, with or without code stamp can be substituted for 3/16 inch steel flat head receivers. (3) Perforated tube heaters with manual or automatic temperature-controlled steam valves. (4) Magnetic starters, alarm bells, pressure gauges, and signal lights. (5) Motorized valve in place of solenoid valve. ROTH TWO-STAGE TURBINE POWER PLANT PUMPS delivering up to 200 PSI at 1750 RPM are standard on this line of equipment. Largo passages between stages, special suction entrance modification, and the inherent va por handling characteristics of the ROTH turbine impeller contribute to this pump's ability to efficiently handle hot water at high pressure differential and low suction head. SPECIFICATION FORM Famish and install as called for on the drawings one Roth Model ................... (specify simplex or du plex) boiler feed unit suitable for --.......GPM at a discharge pres sure of................... PSI. The unit shall consist of the following components: (L) One (substitute two for du plex) Roth Model...............stand ard fitted power plant pump -certified by the manufacturer for a minimum of...................GPM of 206"F water at________PSI with 4 ft suction head. The pump shall be guaranteed by the manu facturer for one year against defects in workmanship and ma terial and shall be guaranteed for ten years by the manufacturer against shaft breakage when flex ible coupled to a motor of recom mended rating. The pump shall contain an internal system for relief of pressure on the packing to insure maximum parlring life. (2) One non-code welded steel receiver made of 3/16" thick cop per-bearing steel with phenolic resin Lining, integral supports, and connection for inlet, outlet, drain, vent, make-up valve, ther mometer, and gauge glass. (Sub stitute if desired one diahfd hwd receiver built to ASME code for unfired pressure vessels rated 75 lb. working pressure with or without ASME inspection stamp but with separable cradle sup ports and connections for inlet, outlet, vent, drain, thermometer, gauge glass and make-up valve also with Hand hole or manhole for cleanout per ASME code de pending on the diameter of the receiver.) (3) One fresh water make-up. valve consisting of a % inch sole noid valve (specify 1 inch on 500 gallon receivers) controlled by a ' float switch mounted on the re ceiver for ..._______phase................ volt current, (substitute float operated mechanical valve with pressure reducing valve set for ' 15 PSI for units with 60 and 100 gallon receivers). (4) Piping between the receiver and pump to consist of one (sub-' stitute two for duplex) vertical section containing a gate valve and one (substitute two for du plex) horizontal section con nected by Roth L-Type strainer to insure minimum pressure drop between receiver and pump. (5) One (substitute two for du plex) 1750 RPM drip proof mo tor for.............phase................volt current. Motor shall not be loaded in excess of NEMA serv- * ice factor for integral drip proof motors. Make shall be General Electric, Louis Allis, Howell or equal. (6) One (substitute two for du plex) magnetic starter of ap proved type suitable for the above motor, with holding coil for________ volts. (7) Gauge glass of proper size. (8) Tank thermometer. (9) When provision for heat ing water in the receiver is required add, "One brass perfo rated tube heater installed in the receiver." When automatic tem perature regulated beater is re quired specify, "One brass perfo rated tube heater installed in the receiver connected to one tem perature controlled regulating valve mounted on the heater connection." I TURBINE PUMP DIVISION ROCK ISLAND. ILLINOIS SEE PAGE TWELVE 3