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16.3.2.5.If the sealant did not flow out at the containment sump 16.4. HYDROSTATIC WATER TEST joint,apply extra sealant and smooth it out all the way around 16.4.1.GENERAL the joint to ensure sufficient and even coverage.(See FIGURE 16.4.1.1.Test the containment sump assembly with water after 16-6, C.) allowing the time required to set(typically four to five hours). 16.3.2.6.For the next application of sealant,apply 1/4-inch- 16.4.1.2.Seal off any piping penetrations and other penetrations diameter beads around the inside groove of the containment found in the containment sump body. sump body.(See FIGURE 16-6,D.) 16.4.2.TESTING CONTAINMENT SUMP(NOT WATERTIGHT 16.3.2.7.Work the containment sump body back and forth,and MODEL) inspect the sealant for air bubbles.If air bubbles are present, 16.4.2.1.Fill the containment sump with water to a point 6 work them out and apply extra sealant material(if needed)so inches above the collar/containment sump body seam. there is sufficient and even coverage. 16.4.2.2.Mark and record the water level,and check it after one 16.3.2.8.Typically,the sealant will skin over in about 90 hour. minutes.(This varies according to temperature and humidity.) 16.4.2.3. Inspect all joints and penetrations for leaks. 16.3.2.9.Take care when exiting the containment sump after applying the sealant. 16.4.2.4. If no leaks are found,remove the water and continue the installation process. 16.3.3.SEALING CONTAINMENT SUMP BODY TO WATERTIGHT TOP 16.4.3.TESTING WATERTIGHT CONTAINMENT SUMP 16.3.3.1.To seal the watertight top to the containment sump F A WARNING body,seat the top onto the containment sump body,making sure Do not pressurize a watertight containment sump as this the top is centered in the channel.(See FIGURE 16-7,A.) could result in death or serious injury. CAUTION 16.4.3.1.Do not water test the watertight containment sump Take care not to damage the top lip when sealing the until after the sealant in the groove at the top of the containment watertight containment sump top. sump has sufficiently set. 16.3.3.2.Fill the space between the top and the outside edge of 16.4.3.2.Fill the containment sump with water to a point above the channel with sealant.(See FIGURE 16-7,B.) this outer groove at the top of the containment sump(in other words,to the top of the access cover lip). A 16.4.3.3.Mark and record the water level,and check it after one 1 hour. 16.4.3.4.Inspect all joints and penetrations for leaks. 16.4.3.5. If no leaks are found,remove the water and continue B the installation process. 16.4.4.REPAIRING LEAKS 16.4.4.1. If a leak is found in containment sump joints(top or FIGURE 16-7 bottom),mark the spot and drain the containment sump. 16.3.3.3.Apply additional sealant around the top edge to form a 16.4.4.2. Dry the leak area both inside and out. filler. (See FIGURE 16-7,B.) 16.4.4.3.Prepare the area by abrading around the leak at least 3 inches in each direction. 16.3.3.4.Inspect the sealant for air bubbles.If air bubbles are present,work them out and apply extra sealant material(if 16.4.4.4.Apply sealant to the abraded area. needed)so there is sufficient and even coverage. 16.4.4.5.Retest after sealant material sufficiently sets up. 16.3.3.5.Work the sealant so there is a tight"seal"of sealant between the edge of the top and the outside edge of the 16.5.WATERTIGHT COVER INSTALLATION channel.(See FIGURE 16-7,B.) 16.5.1.Inspect the gasket in the groove on the underside of the cover.Brush away any debris and make sure the gasket is clean. 16.3.3.6.Typically,the sealant will skin over in about 90 minutes.(This varies according to temperature and humidity.) 16.5.2.Check the top lip of the opening for nicks or cracks,and clean as necessary.If damage is detected,contact the UST 16.3.3.7.Take care when exiting the containment sump after coordinator at the Xerxes plant nearest you. applying the sealant. 24