Flanged Connections

One-piece hand lay-up vinyl ester flanges with stub pipe are utilized on sizes from 1” to 24” and are permanently bonded to the tank. Flanges can be located either above or below liquid level and can be ordered in three different styles based upon intended use.

• Design Tanks recommends the use of a 40-to-60 durometer full-faced gasket, 1/8” thick, and a maximum bolt tightening torque of 25-30 ft/lbs.
• Flange face is 150 lb. ASA bolting geometry.
• Sidewall-mounted flanges protrude inside tank a minimum of 1” as shown. Bottom flanges are flush-mounted unless otherwise specified.
• Bolts are not included with flanges unless a blind flange is also ordered. Column listing number of bolt holes and size refers to maximum size that flange will accommodate and does not necessarily reflect Design Tanks standard installation. See blind flanges below to determine standard size bolts.
• Blade-gusseted or conically gusseted reinforced flanges are also available in 8”-pipe size and smaller.

SPECIALIZED FLANGE VARIATIONS

• Siphon drains provide drainage within 1” of tank bottom. They are available either gusseted or non-gusseted.
• Side-bottom drains extend below the tank to provide nearly complete drainage of flat-bottom tanks. Drains are equipped with gussets. Foundation pad must be notched to accommodate flange. “W” based on tank edge placement.

NOTE:

• All standard blind flanges are installed with full-face gaskets and 304 stainless steel bolts, nuts, and washers. One-half inch bolting hardware is supplied for sizes through 6”; ¾” hardware for 8” through 24” pipe size.
• Diagram shows 10” – 18” blind flanges;
  1” – 8” are flat; 20” – 24” are domed.
• Blind flanges provide a sealed cap for flanges that are not currently plumbed.
• Chemical compatibility determines gasket and bolting material.