Inspection of digesters.
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Inspection of digesters. Prepared under the direction of the Digester Corrosion Subcommittee of the TAPPI Chemical Engineering Committee by Technical Association of the Pulp and Paper Industry

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Published in New York .
Written in English


  • Paper-making machinery

Book details:

Edition Notes

SeriesTAPPI monograph series -- no. 12
LC ClassificationsTS1109 T35
The Physical Object
Number of Pages183
ID Numbers
Open LibraryOL17161776M

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This Technical Information Paper (TIP) provides guidelines and procedures for inspecting batch digesters in pulp mills. It describes damage mechanisms and addresses inspection frequency, planning, methods, damage or inspection locations, cleaning and preparation, technician qualifications, test equipment and documentation. digester, particularly adjacent to the liquor make-up outlet and the top circulating return lines. A pit gauge is useful for measuring the depths of erosion-corrosion pits. 7. Inspection of other components Components that are usually included in a digester vessel inspection include the top separator head, the central pipe, and the bottom scraper. e digestion o q 00 o 03 o cc lu j 3. co o 1- opera - — x a uj a. a. ^ fe a m? e n oc part potpou z o part 2 rocess oper o co h x d dc co — 1 3s °- co o cc 1- ssary o _i 0 1 co theory cq co lu o a: lu ll lu a: 1 lo cm ^ types of equipment o q 1- co > p _i a. Solution: Sour digesters produce quantities of carbon dioxide which in itself is a fire extinguisher. When starting up a sour digester, you need to be very careful about checking out gas handling and safety devices. This is to be sure air is not getting into the digester to create an explosive mixture of newly produced methane.

The Plumbing Code. The Code outlines the best and most modern methods to be used in plumbing installations. Since the plumbing in any private or public building is a part of the community water and sewage disposal system, it is vital that such installations should not be left to the discretion of irresponsible individuals. GUIDE TO BIOGAS FROM PRODUCTION TO USE with support of the Federal Ministry of Food, Agriculture and Consumer Publisher Fachagentur Nachwachsende Rohstoffe e.V. (FNR). In terms of size, biogas digesters have been developed to cater for a wide range of biogas demand. 1. Household plants are small-scale plants of about 8–10 m 3 usually located in rural areas and depending on households for their inputs, control and utilization of outputs. This is the most common application of biogas technology and the one most referred to in this report. The digestion process can be either batch or continuous, and the digester can be heated directly or indirectly. The digester generally has a volume of between and ft3 and will normally produce between and tons of unbleached air-dried pulp per blow. The digesters are charged with white liquor, chips, and recycled black liquor.

Inspection of batch digesters in acidic (sulfite) pulping service, which are stainless steel or have a brick-lining, is not specifically covered by this TIP, although the general guidelines herein apply. This TIP does not provide guidance on interpreting inspection findings, assessing fitness for continued service or designing acceptable repairs. CONTRACTOR shall ensure that the digester tank has been purged and is free from all explosive gas before performing any work in the digester tank. All provisions of confined space entry for CONTRACTOR and inspectors and also necessary lighting for inspection purposes shall be provided by the CONTRACTOR.   The digester captures methane gas from cow manure and burns it in a turbine to create power. The anaerobic digester cost $ million and was built by Revolution Energy Solutions of Washington, D.C. The digester creates million kilowatt-hours of electricity, enough to power homes each year. Natural Resources Building P.O. Box Washington ST SE Olympia, WA