Sewage sludge digesters in the form of sewage treatment tanks having covers and adapted to receive and store sewage sludge while it undergoes bacterial decomposition known as digestion, and gas safety devices specially adapted for sewage treatment tanks, namely, flame traps, drip traps, accumulators for condensate and sediment, pressure relief valve structures, and pilot line flame cells

'accumul':44 'adapt':14,34 'bacteri':24 'cell':57 'condens':46 'cover':12 'decomposit':25 'devic':32 'digest':3,28 'drip':42 'flame':40,56 'form':6 'gas':30 'known':26 'line':55 'name':39 'pilot':54 'pressur':49 'receiv':16 'relief':50 'safeti':31 'sediment':48 'sewag':1,8,19,36 'sludg':2,20 'special':33 'store':18 'structur':52 'tank':10,38 'trap':41,43 'treatment':9,37 'undergo':23 'valv':51

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