Document 0Z1Y7yN2DpdX1Q6ggRxREjEn

SINGLE LAYER SECTION 1 HI-TEMP APPCICmTON Page 14 4a3 SECURING HEAD INSULATION 4A3.1 Insulation, on dished heads, having a diameter of 6' or less shall be secured with 3/8" wide bands, that over 6* diameter with 3/4" wide bands. 4A3.2 If dished heads, of horizontal vessels, have a diameter of 48" or less the insulation on them shall be secured to the end bands that secured the shell insulation. (See figure 11A) 4A3.3 The head bands shall be secured to the shell band on not more than 4" centers and stretched.radially to a floating ring (see note) positioned in the center pf the head as shown in figure 11B. NOTE: A floating ring is made by bending;?A 3/8" rod into about an 8" diameter ring and welding the ends together. It shall not be anchored but allowed to move in the direction of the pull equalizing the tension on the opposing band. The,ring can be kept in the center of head by using 2 banding machines, one on each 'side of the ring, pulling against each other. p BANDS r t. 4 ,MAX.CENTER A 1-- j ak END BAND ON SHELLINSUL. SIDE VIEW FIGURE IIA FLOATING RING END VIEW FIGURE IIB