Penn Separators Blowdown Equipment

USING CHART A

1. Select Separator Size from Chart “A” by matching your Operating Pressure and Bottom Blowdown Valve Size. The largest size valve and highest pressure should be used for multiple boilers.
2. From Chart “A” read the height “H” of the separator, “I” the inlet size to match blowdown valve size, “D” the drain and “V” atmospheric steam vent recommended sizes. All connections come standard as NPT. Flanges are optional.
3. All Separators are 14″ in diameter and are ASME Code “UM” designed and stamped for 250 psig at 450 deg. F. Select plate thickness of 5/16″ or 3/8″ as local regulations required. Add for National Board “U” Stamping when required. Flanged units are limited in pressure to flange rating and would be stamped accordingly.
4. The separator size is now determined and the piping can follow these sizes. Separators are designed to quietly exhaust steam to atmosphere at 90 dB(A) or less and operate at a pressure of less than 5 psig. Drain sizing includes cooling water required for 140 deg. F. drain temperature. Select cooling valve size from chart “B” .

USING CHART B

1. Depending upon the temperature of the cooling water used, locte the section of the chart which applies, 50-70 or 71-80 F.
2. At the top of the chart locte Separator Inlet size and in left column under the section selected in step one, locate Boiler Operating Pressure. You now have a selection of three valve sizes.
3. From the top of chart select the cooling water line pressure, either 40, 50 or 60 and read the desired valve and line size.
4. A pressure reducing valve should be used prior to temp regulator for cooling water above 60 PSIG.

USING CHART C

1. Use Set Pressure of Valves and Boiler MBH or BHP x 33.3 to determine Sep. “H”eight, “D”rain and “V”ent Size.
2. Separator Inlet Size is deterined by Relief Valve, Outlet Size. When two or more valves are manifolded together, the Inlet size must be larger than the combeines Cross Sectional area of Valves’ Outlets (See Chart C1).
3. Separator Diameter is 14″ except:
   16″ diameter when Inlet is 4″ and Vent is 5″ or larger
   18″ diameter when Inlet is 5″ and Vent is 5″ or larger
4. Plate Thickenss 5/16″ or 3/8″ as required by Local Regulations.
   All Separators are constructed to ASME Code.

Single units were designed to handle up to 300 P.S.I.G. On heating, process or power boilers. Now Penn Separator provides special manifolds to distribute the flow from the Blowdown Line to each of two units or up to 1000 P.S.I.G. and three units for up to 1600 P.S.I.G. These Parallel Separator are 14″ in diameter requiring minimum of floor space, or wall hung. Manifolds are provided as required to meet existing conditions. These 14″ diameter vessels need not have as heavy wall as a conventional large blowdown tank, and corrosion is zero due to the exclusive Stainless Steel Striking Plate and the Self-Draining, Self-Drying design.

Widely successful as singular units, are now arranged parallel in batteries of two or three units.

In designing the Boiler Room for the Louisiana Polytechnic Institute, one Penn Separator Parallel System was used on a 400 PSIG Boiler in place of a Conventional Blowdown Tank. This is the Modern Maintenance-Free method of handling Boiler Blowdown.

Blowoff Tanks

Penn Blowoff tanks come standard ASME Code Sec. VIII, Div.1 designed and stamped for 50 psig at 450 deg. F. and are of a welded construction from 3/8″ thick carbon steel materials. A blowdown tangential inlet with stainless steel wear plate, water overflow outlet which extends to within 6″ of the bottom of the tank, a 3/4″ siphon shall be located in the top portion of the outlet pipe and atmospheric steam vent. The tank would be supported by a set of four angle legs with floor pads. 36″ diameter and smaller tanks include couplings for inspection ports and larger tanks include a manway. A level gauge, thermometer, and pressure gauge can also be supplied as an option.

NATIONAL BOARD BOILER BLOWOFF EQUIPMENT RULES 1991 EDITION

The blowdown from a boiler(s) that enters a sanitary sewer or discharges in an area which could be hazardous to life or property should be controlled. The control should be through some form of blowoff equipment which will reduce the pressure and temperature to acceptable safe levels.

Penn Blowoff Tanks are completely welded and assembled in Brookville, Pennsylvania, USA using only new materials with a shop primer applied to the exterior. Each unit is skidded for shipment and carries a full year warranty against materials and workmanship.

1. Calculate the Cu. Ft. amount of blowoff when lowering the Boiler Water Level 4″. The following formula should be used: Cu. Ft. of Blowoff = 4″/12″ X Drum Dia. Ft. X Drum Length Ft.

2. Select a Blowoff Tank which has Cu. Ft. holding capacity equal to the amount calculated.If the amount of Blowoff is known select a tank with that amount holding capacity.

3. Select the drain and vent nozzles below using the Blowdown Valve Size and Boiler Operating Pressure.The inlet should be the same size as the Blowoff Valve.