Document aBa584Q7nKmxwJB7v3O0V26MN

HALL REPORTINDUSTRIAL WATER Hal/ LoHoroforiei, Inc.--*A Subsidiary of Hogan Corporation, Pittsburgh, Po, Volume OCTOBER 1953 Expert Knowledge Solves Process Problems A hurry-up call from a Hall field engineer sent C. T. Roland, Pittsburgh headquarters expert on metal preparation and paint finishing to confer with a west coast automobile plant on a paint blistering problem. The sudden occurrence of the blistering baffled-the plant enginoers until Roland investigated the possi bility of a change in tho source of the water used in final rinsing of tho metal before paint was applied. He found that the quality of the water supply had changed shortly before the blistering de veloped. Analysis showed thAt this supply was higher in pH and Mr. Thompson's on-the-spot investigation revo&lod that too much alum was being used in the sizing. Alum feed was reduced and the process water was treated with a glassy phosphate corrosion inhibitor. When reliable controls of the modified process were sot up, corrosion disappeared. dissolved solids, particularly sodium chloride, than the water previously used. Mr. Roland's ex perience in dealing with the action of soluble salts under paint films Water Well Capacity Increased by Treatment led to the conclusion that in this case the paint was acting as a With Classy Phosphate aemi-permeable membrane, allow ing the passage of moisture from tho outside surface of the paint to the salty underlayers. Blisters formed wherever the osmotic pres sure of the salt solution exceeded the bond of the paint to the metal. The higher alkalinity of the water contributed to the loss of adhe sion, promoting further separation of the finish from the metal. With the cause for tho trouble established, recommendations wore made to obtain a water supply low in solids until tho plant could install equipment to insure the constant delivery of Initial capacity of now municipal well was recently increased 63% by treatment with Calgon.* Other now wells in the field developed capacity increases up to 34%. In an old well where the capacity had fallen to only 9.5 gallons per minute per foot of drawdown, one charge of Calgon raised the ca pacity to 31.2 gallons per minute per foot of drawdown, an increase of 228%. In another case, after acid clean ing had restored a municipal well to approximately the same ca pacity it had when new, a single charge of Calgon raised tho ca water of suitable quality for this pacity by 100%, or about twice operation. the original capacity of the well. In another case where special The dispersive action of glnssy ized knowledge was useful, Ralph phosphate is responsible for its Thompson, specialist on paper efficiency as a well cleaner. Clean manufacturing processes, was ing with inhibited acid removes called in to help a paper mil) out deposits of calcium carbonate and of a jam. Their calender rolls, the iron oxide, but will not affect polished steel rolls that "iron" accumulations of clay, quartz, paper qmooth, were corroding. amorphous silica, mica or silt. Regrirding to polish the rolls was These latter are also dispersed costly. and removed by Calgon cleaning. Hall Is Walcr Consul For Asia's Greatest Power Station Ales Henrietta, staff engineer consultant for India's new power ^ lifts water sample from contalnj marked "This Package Oponod u Rxeminod by Customs at Calcutta^ extensive project to hasten industrial development of a . million square mile area of Indii Engineers and constructors the station, The Kuljion En,,, necring Corporation of Philadri phia, have retained Hall Labor tories, Inc. as water consultani fnduHrial Water Problem Require Special Handlin, There are no "stock answers' industrial water problems. Foi information, write, wire or c#u Hall Laboratories, Inc., Hagan Building, Pittsburgh 30, Pa- Water is your industry's most an poriant raw material. Don'tioosU . 'Cslgnn is n registered trademark- HAU lAeO**'QRIII, INC.-CONSUITANTI OH fROCURffAfiNT, U1MMIN1, VJI AND OISPOSAl Of INDVmiM W*1*1 : 32 POWCR OCtOBfR