Search by: | IADC | Compressive Stength |

Enter the Compressive Strength:


Your Selection" . "115 to 215" . "
" . "117 to 217"; $formation = "Soft"; $gdescription = "Very soft, unstratified, poorly compacted rocks such as poorly compacted clays and sandstones, marl limestones, salts, gypsum, and hard coals."; $str = "0 to 3,000 psi / 0 to 35 MPa"; } elseif ($cstrength == 2) { $recommend = "221 to 311" . "
" . "225 to 315" . "
" . "217 to 317"; $formation = "Medium"; $gdescription = "Medium-hard and abrasive rocks such as: sandstones with streaks of quartz, hard limestone or chert, crystalline dolomites, hematite ores, and hard shales."; $str = "3,000 to 6,000 psi / 20 to 40 MPa"; } elseif ($cstrength == 3) { $recommend = "411 to 431" . "
" . "415 to 435" . "
" . "417 to 447"; $formation = "Hard"; $gdescription = "Hard abrasive rocks such as: sandstones with quartz binder, hard sandstones, hard quartz shales, magma and metamorphic rocks."; $str = "6,000 to 15,000 psi / 40 to 65 MPa"; } elseif ($cstrength == 4) { $recommend = "511 to 531" . "
" . "515 to 535" . "
" . "517 to 547"; $formation = "Soft"; $gdescription = "Long intervals of very soft poorly compacted shales, dolomites, sandstones, clays, salts and limestones."; $str = "15,000 to 25,000 psi / 65 to 85 MPa"; } elseif ($cstrength == 5) { $recommend = "611 to 611" . "
" . "615 to 615" . "
" . "617 to 647"; $formation = "Medium"; $gdescription = "Medium hard and abrasive rocks such as sandstones with streaks of quartz, hard limestone or chert, hematite ores, hard, well-compacted abrasive rock such as: sandstones with quartz binder, dolomites, quartzite shales, magma and metamorphic coarse grained rocks"; $str = "25,000 to 40,000 psi / 85 to 100 MPa"; } elseif ($cstrength == 6) { $recommend = "721 to 731" . "
" . "725 to 735" . "
" . "717 to 747"; $formation = "Hard"; $gdescription = "Hard, well-compacted rocks such as: hard silica limestones, quarzite streaks, pyrite ores, petryfied, hematite ores, magnetite ores, chromium ores, phosphorite ores, and granites"; $str = "40,000 to 55,000 psi / 100 MPa "; } elseif ($cstrength == 7) { $recommend = "821 to 831" . "
" . "825 to 835" . "
" . "817 to 847"; $formation = "Hard"; $gdescription = "Hard, well-compacted rocks such as: hard silica limestones, quarzite streaks, pyrite ores, petryfied, hematite ores, magnetite ores, chromium ores, phosphorite ores, and granites"; $str = "40,000 to 55,000 psi / 100 MPa "; } echo " $str"; ?>

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