Page 152 - Water and wastewater engineering

WELLS 4-7

Swivel

Large diameter suction hose
High capacity, low head pump or jet Kelly with
large bore
Pump discharge
Rotary table

Settled sand and cuttings in pit
Large diameter drill pipe

Reverse circulation drill bit

FIGURE 4-2
Basic principles of reverse-circulation, rotary drilling are shown in this schematic diagram. Cuttings are lifted by upflow inside
the drill pipe. The Kelly is a part of the Kelly drive. It is square, hexagonal-or octagonal-shaped tubing which connects to the
drill pipe for drilling wells.

• American Society for Testing Materials (ASTM).

• American Petroleum Institute (API).
• American Iron and Steel Institute (AISI).
• American Water Works Association (AWWA).
• U.S. federal government.

Typically one of the following is specified: AWWA A-100, ASTM A-120 and A-53B grade,
“stenciled” or API 5-L. Minimum weights and thicknesses may be found in Recommended
Standards for Water Works (GLUMRB, 2003).