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L„u.31 ,»o oo: is ao�-�try-iytiy TOES L WHELMN PAGE 02/05 DO BLE WALL TANKS tidery Containment Systems Pioneering 4 . q The tank shall b- 04abricated laces under every opening. The plates shall be quarter inch (IJ4")'thick steel and be larger in diameter than the tank manhole anrdjor shall be twelve inches (12") square under NPT tank openings.The primary tank shall be constructed in accordance with UL-58 and ULC 603.1 requirements. The tank shall be equipped with the appropriate removable lift lugs which facilitate site handling and installation. Lift lugs shall be capable of withstanding weight of tank with a safest• factor of 3 to 1. The t.mks shall be constructed with fittings as indicated on accom- panving drawings. The outer tank shell shall be constructed with High Density Polvethvlene (HDPE) no less than 100 rail thick and 1r,6 to HDPE roto molded heads no less than 250 mils thick. Fittings The tank shall be supplied with four inch (4") and two inch (?") threaded openings. Each threaded opening will include '%P': internal threads and reversed externA threads and will pro- t r-r. d- upward through the tank shell. External threads shall be u!11lye,I to seal outer tank with compression rings. The fittings :ha'? be located as indicated on the drawings. Double Ring Manhole and Sump Mounting KO 'l a r k shall be supplied with _ double ring(Ili) reverse flange ma•rh,Aes with two sets of studded bolts. Each-manhole shall be sul-pl red with lid in place, neo-cork gasket underneath and the apf r opriate number of washers and nuts sec'tvWy tightened about the inner ring of studded bolts. Tank shall also be supplied with a ma-ihole sump mounting kit (shipped loosor each double ring (UF.) manhole_ This kit shall cons' Of ap>Eiate number of washers and nuts, one (1) gask dzonii;�e;(3) piece steel compression ring which will be.usi!d to tat ti41he mounting of a high density pofyetl,71ene'man1`to'te'.4,�ccess-stmp onto the outer ring TO7:1 L. CONTAINMENT