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2. French catheter scale - Wikipedia

   en.wikipedia.org/wiki/French_catheter_scale

   The French size is a measure of the outer diameter of a catheter (not internal drainage channel, or inner diameter). So, for example, if a two-way catheter of 20 Fr is compared to a 20 Fr three-way catheter, they both have the same external diameter but the two-way catheter will have a larger drainage channel than the three-way.

3. Process duct work - Wikipedia

   en.wikipedia.org/wiki/Process_Duct_Work

   (this is based on personal experience, and my vary with loads, duct size, and industry standards) Large, round process ductwork is usually fabricated from 1/4-inch (6 mm) mild steel plate, with ovaling stiffening rings at 15 to 20 ft (5 to 6 M) on center, regardless of diameter. These lengths allow for resistance to wind ovaling and resistance ...

4. Duct (industrial exhaust) - Wikipedia

   en.wikipedia.org/wiki/Duct_(industrial_exhaust)

   Sizing of the ductwork; Calculation of resistance; Finalizing the capacity of blower, etc. [4] The goal is to keep contaminants out using minimum airflow. It is estimated that increase in an inch wg [clarification needed] of static pressure can add a few thousands of dollars to the operation cost per annum.

5. Hydraulic diameter - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_diameter

   For the limiting case of a very wide duct, i.e. a slot of width b, where b ≫ a, and a is the water depth, then D H = 4a. For a fully filled duct or pipe whose cross-section is a convex regular polygon , the hydraulic diameter is equivalent to the diameter D {\displaystyle D} of a circle inscribed within the wetted perimeter .

6. Nominal Pipe Size - Wikipedia

   en.wikipedia.org/wiki/Nominal_Pipe_Size

   Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...

7. AOL Mail

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!