Basic - (example: Hydraulic engineering) searches for the entered expression in an exact match with the entry - i.e. in the order in which the words follow each other.
Logical OR - (example: butterfly valve OR lattice disc) pages containing one, the other, or both of the entered keywords will be included in the results.
Logical AND - (example: ASME AND internal pressure) only pages containing both required words will appear in the results.
Logical NOT - (example: spherical NOT ASME) pages containing the name "spherical" but not containing the word "ASME" will be displayed in the results.
if $i=1$$$B_T=1.61148+1.85385\cdot\cfrac{d}{D}-4.38205\cdot\left(\cfrac{d}{D}\right)^2+5.8264\cdot\left(\cfrac{d}{D}\right)^3$$else if $i=2$$$B_T=1.57944+2.42327\cdot\cfrac{d}{D}-4.634\cdot\left(\cfrac{d}{D}\right)^2+11.07945\cdot\left(\cfrac{d}{D}\right)^3$$else$$B_T=1.90616-4.66479\cdot\cfrac{d}{D}+52.95626\cdot\left(\cfrac{d}{D}\right)^2-156.30366\cdot\left(\cfrac{d}{D}\right)^3+204.97321\cdot\left(\cfrac{d}{D}\right)^4$$
Coefficient $ B_B $
if $i=1$$$B_B=0.797+7.794\cdot\cfrac{d}{D}-43.549\cdot\left(\cfrac{d}{D}\right)^2+122.372\cdot\left(\cfrac{d}{D}\right)^3-112.269\cdot\left(\cfrac{d}{D}\right)^4$$else if $i=2$$$B_B=0.997+4.127\cdot\cfrac{d}{D}-23.179\cdot\left(\cfrac{d}{D}\right)^2+81.608\cdot\left(\cfrac{d}{D}\right)^3-77.795\cdot\left(\cfrac{d}{D}\right)^4$$else$$B_B=0.683+9.809\cdot\cfrac{d}{D}-52.437\cdot\left(\cfrac{d}{D}\right)^2+139.668\cdot\left(\cfrac{d}{D}\right)^3-114.395\cdot\left(\cfrac{d}{D}\right)^4$$
Coefficient $ B_A $
if $i=1$$$B_A=1.482+1.635\cdot\cfrac{d}{D}-17.72\cdot\left(\cfrac{d}{D}\right)^2+64.654\cdot\left(\cfrac{d}{D}\right)^3-58.064\cdot\left(\cfrac{d}{D}\right)^4$$else if $i=2$$$B_A=1.491+1.283\cdot\cfrac{d}{D}-12.812\cdot\left(\cfrac{d}{D}\right)^2+40.026\cdot\left(\cfrac{d}{D}\right)^3-33.061\cdot\left(\cfrac{d}{D}\right)^4$$else$$B_A=1.463+2.297\cdot\cfrac{d}{D}-23.872\cdot\left(\cfrac{d}{D}\right)^2+81.116\cdot\left(\cfrac{d}{D}\right)^3-72.492\cdot\left(\cfrac{d}{D}\right)^4$$