CORRECTONS TO THE PUMP AND SEAL MANUAL
The Mc Nally Institute
- Page 30, Sixth line from the bottom should read L10 not B10
- Page 72, Under "Too much axial movement of the shaft" change the paragraph to read:
- Thermal growth of the shaft. Every inch of shaft will grow 0.001" for each 100°F (0.001 mm/mm/ °50C of temperature increase.
- Page 79 the top line in the formula at the top of the page should read:
- Page 81, After the last line on the page add:
- 8.33 = Weight of one gallon of water (U.S.)
- Page 99 & 100, last line. Change it to read:
- The outside ambient temperature has changed dramatically. I ran into a situation where a supplier was oiling the bed of his truck to prevent phosphate ore from sticking to the truck bed in the winter. This oil ended up in the finished product and attacked the ethylene propylene O-ring
- Page 128, Next to last paragraph should read "and the 300 series of stainless steel".
- Page 181, Second paragraph from the bottom should read: The time element takes over and the compound solidifies in the seal components restricting their movement and sometimes it solidifies between the lapped seal faces causing them to break when the pump shaft rotates.
- Page 206, Top line should read "35 means 3 x 3 x 3 x 3 x 3 = 2433. 3 2.5 means to multiply the square of 3 (9) by the square root of 3 (1.732) = 15.6
- Page 225, BACK PULL OUT PUMP. The middle paragraph should read: Most of these pumps are supplied with an open or semi-open impeller that can be adjusted to the volute from the power end without having to disassemble the pump.
- Page 292, CENTIPOISE. Change the first line to read: The term viscosity means resistance to pouring. The basic metric unit of absolute viscosity is the "poise" (1 gm/cm-second or dyne-second per square centimeter).
- Page 294, CERAMIC the sixth line should read" to control the grain size and improve the firing characteristics
- Page 303, COATED SEAL FACE, second paragraph. It should read "When cracking occurs in these coated materials it is said to have heat checked".
- Page 314, CREVICE CORROSION. Add the following statement to the end of the article: The solution to crevice corrosion problems with stainless steel in salt water applications is to coat the surfaces of the parts in contact with zinc oxide. The zinc will act as the sacrificial anode
- Page 349, The last bullett should read
- The diaphragm is usually manufactured from buna N material or any appropriate elastomer.
- Page 408, HYDRODYNAMIC SEAL. The fourth paragraph should read " Remember that the shaft must be rotating at a reasonable rpm and in the correct direction to provide the proper lifting force.
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