Pipe schedule

Pipe schedule and end connection for each service and pressure rating. 

Try 1/ -inch (i.d. = 1.61), since 114-inch (i.d. = 1.38) is not stocked in every plant. If it is an acceptable plant pipe size, then it should be considered and checked, as it would probably be as good pressure drop-wise as the 114-inch. The support of 114-inch pipe may require shorter support spans than the 114-inch. Most plants prefer a minimum of 114-inch valves on pressure vessels, tanks, etc. The valves at the vessels should be 114 inch even though the pipe might be VA inch The control valve system of gate and globe valves could very well be lA inch. For this example, use 114-inch pipe, Schedule 40 ... 

Pipe schedule number = 1000P/S, approximately, where P is the internal pressure psig and S is the allowable working stress (about 10,000 psi for A120 carbon steel at 500°F). Schedule 40 is most common. 

Aluminum pipe schedules conform to those in Table 10-22. Consult suppliers for available sizes and schedules. 

Standard specification for poly(vinyl chloride) (PVC) plastic pipe, schedules 40, 80 and 120... 

MECHANICAL DESIGN OF PIPING SYSTEMS 5.5.1. Wall thickness pipe schedule... 

It was decided to use a bank of 2-in. schedule 80 pipes in parallel that are 40 ft in length. For pipe schedule 80, the cross-sectional area is 0.0205 ft-. The number of pipes necessary is... 

The specifications give the minimum pipe wall thickness, the pipe schedule and insulation requirements. 

Example 2. Given 6-in. pipe, schedule 40. All other data as in example above. 

Stainless Steel. Austenitic stainless steels of the AISI 300 series are well suited for low temperature service by their strength and impact resistance properties. They are easy to weld, have a low heat conductivity and require no stress relief. Partially offsetting these factors is their higher cost. The commonly-used analyses of stainless steel are available in thin wall piping schedules 5S and lOS as well as in the normal schedules. Thinner walls are allowable for stainless steel because it is not subject to corrosion. All of its thickness is available for strength. 

Solution 6.1. Pipe diameters are quoted in terms of their nominal pipe size as well as their schedule number that represents wall thickness—Table 6.1. The two most common pipe schedules are 40 and 80. Schedule 80 pipe is used for higher pressure applications and has thicker walls. Since the outside diameters (OD) of all nominal pipe sizes (NPS) are the same, higher schedule pipes have a smaller inner diameter (ID). The inside diameter of the 6 in. Sch40 pipe is 6.065 in. and it is 4.026 in. for the 4 in. Sch40 pipe. 

Schedule 40 designates former standard pipe. Schedule 80 designates former extra-strong pipe. 

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