Document Lg9Rg7dgy2N0KgLzb4Q0d2wZq

Survey of dust collection ;:uiPk3T - a&tsn-hiil uTg. co. gakd kqo^. The dust collection system can be divided into three phases for SSi0n: 1. 2. 3. V'e can consider air supply Air removal from the machines The dust collector k,ftTi;. IN] i < i r p r> ' ! >i * - - The Card Room includes the blenders, pickers, cards, spinning frames and twisters. The entire system was engineered in 1949 at which time we built an entirely new plant SUPPLY: wv WQ XIUwi-4 Cl IvLdl wl VUU WXU UX XwiiU* WXWUQ1 air. This air is cooled in the summer and heated in the winter and held to a maximum relative humidity of 50. This air has been fil tered by a ?>'estinghouse electrostatic precipitron and an American blower spray type air washer. The Card Room is divided into three separate zones, each of which can be controlled by a thermostat. Ue supply to the Pickers a total of 2800 cfm of air through two 1400 cfm defusers. The Cards are supplied with 8700 cfm through 16 defusers and the Twisters are supplied with 13,500 cfm through 10 defusers. The defuser installation has been successful with the exception that the ceiling lights are surface mounted and sometimes we have difficulty with the blast of air striking the projecting lighting fixtures and blowing down on the operators. DUST REMOVAL ThOu THE aACRIHES: We remove from the Picker section approximately 6900 cfm which is taken through two Picker condensers. *Ue remove from each of six Cards approximately 1800 cfm each. All of this air is removed from the top of the Card through a wood and sheet metal hood system. The hoods over the main cylinders are fairly successful. However, we are now experimenting with changing the shape of the hoods over the aprons, etc. to get better efficiency* We now remove from 10 of our 11 Twisters about 1000 cfm each through an 8** pipe under each machine. We are, at present, instal ling the system originated by John Weber. We are making a few modi fications to this system and we are pleased with the results as shown on one spinning frame. We try to exhause more air than we supply to this room so that we have a flow into the room from other areas- DUCT COLLECTOR: Our dust collecter consists of three Pagborne jf913 CB-1 cyclones arranged in parallel and are fed by a 42'* diameter pipe which collects the dust from all of the aforementioned machines. These cyclones THIS PPG ITS BY PPG INDUSTRIES, INU. I DB 0024118 | -8- Asten-Hill kfg- Co- Card. Room discharge into a four ^section CJ-1 Pangborne bag collecter. The bag collecter discharges into a 30" x 30" square manifold which is ex hausted by a #39? American blower. This is a backward curved, bladed fan used for clean air# It is driven by a 75 hp motor and ODerates a-t 1530 rpm. Vie have had to replace the bearings in this blower every year since its installation. Vie have tried all hinds of bearings includ ing roller, ball, etc. without any improvement. Vie have had the rctor balanced and have installed a new shaft. t. It is my opinion that the bearing trouble is caused by the fan operating at a static pressure beyond its rating which causes hunting. This is further shown by the fact that we hear an occasional rumble in the fan and a decrease in the amperage lead. The 30'* square duct has collapsed on several occasions due to high static pressures. The CJ-1 bag collecter operates well from the standpoint of re moving the dust from the air but the resistance across the bags is excessively high as can be noted from the table below. These bags are cleaned by periodic shaking at which time the section being rap ped is closed off and reverse air is Introduced which is supposed to blow the dust from the bags. This was originally supposed lo be done by the operators every four hours and was a complete failure because we could never get the operators to conscientiously perform this duty. Vie hsve now installed an automatic screen rapping system which operates each section for five minutes on an hour and a half cycle. This bag collecter is cleaned every other week but we have had trouble with the cleaning personnel tearing the bags while at tempting to blow off the dust with a compressed air hose and pipe. Ve are now awaiting the Pangborne Company's recommendation as to how the high resistance acress these bags can be reduced.' Vie fully expect that they will recommend replacing the bags at an ex pense of approximately 3,000 plus labor. The C3-1 cyclones operate rather well except when the bag col lecter 's excessive resistance has reduced tha velocity through the inlet pipe at which time we have settling of the heavier dust in the Inlet pipe. Vie have made it a policy to clean these pipes once a week. NOT COME FROM riLr THIS DOCUMENT WAS NOT A RECORD OP Jljp INDUSTRIES, INC. DID NOT COME FROM IP! FILES. AND CANNOT BE AUTHENTICATED BY PPG INDUSTRIES* INC. 3 As ten-Hill mfg. So. Cahd Room STAiliARY OF STATIC READINGS IN INCHES OF LATER Min. Design Present Cond. Present Aver. Cond. where Conditions Tilth Clean Baas Condition dust will be object ionable At 397 Blower .....10.5 Clean Air Side of Baa Collecter 10 Dirty Air Side of Baa Collecter 7* At Cyclone 6 lancmeter 5.3 12 4.5 2.4 2.4 12 11 4 2.2 2.1 12 11 3,5_ 2 1-3/4 The reading referred to as the manometer reading in this table is a reading where one of the main ducts goes through the floor and gives some idea of the efficiency of the entire system. This manometer, because it is conveniently placed, can be read often and will give an indication of any difficulty before it becomes serious enough, to affect the efficiency of the system seriously. John mcCormaclc Plant Engineer NO; I 'j: THIS DOCUMENT WAS NOT A PPG INDUSTRIES, INC, DID NOT Ft$M IT'S FILES AND CANNOT 31 AUTHENTICATED BY PPG INDUSTRIES, INC. * T BB 02412OJ c^OQC