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H1. Other Accessories <br />Compression Rings <br />• Optional steel compression rings are available to con- <br />nect a piping trench liner (flexible membrane or fiber- <br />glass trenchliner) to: <br />❑ The manway cover. <br />❑ A fiberglass attachment ring. <br />❑ A manway interface ring. <br />• When flexible membranes are used, a special caulk (sup- <br />plied by the trench liner manufacturer) is applied to both <br />sides of the liner before fastening it to the manway flange. <br />Fiberglass Manways <br />• Tighten manway bolts until gasket seals the opening. <br />❑ Do not exceed 50 foot pounds during bolt tighten- <br />ing or manway flange damage may occur. <br />• Manway gaskets are maintenance items which may have <br />to be replaced periodically or when they fail to pass a <br />tightness test. <br />28 <br />