#PIPEROLL LEVEL 52 SOLUTION PLUS#

Yet, actual safety factors often exceed those values by a large measure, especially when Ductile iron is involved. Minimal safety factors are generally set at 2.0 for most design scenarios in our industry.

If the design pressure, i.e., the highest internal pressure to be experienced, is the test pressure, typically 150-psi, the safety factor is 20! Manufacturing considerations that add additional metal to the required minimal pipe wall are the basis for pressure containment capabilities above the nominal wall pressure rating. All Thickness Class DI pipe have a pressure rating of 350-psi and, therefore, sufficient for containment of at least 900-psi water, joint restraint dependent. This value, however, is NOT the ultimate pressure containment value for that DI pipe.

#PIPEROLL LEVEL 52 SOLUTION PLUS#

Pressure Rating: represents the minimum valued capacity of the barrel, and in specific terms, equates to the pressure class of the barrel plus 100-psi of surge allowance, with that sum then multiplied by a safety factor of 2.0.There is a Pocke Engineer Calculator for that too, the Thrust Restraint Calculator!

Thrust forces generated from elevated internal pressures are the issue and must be addressed via thrust blocking or the now preferred restrained joint pipe and fitting systems. Yes, it is short in duration, but the duration is not the concern. Design Pressure: equates to the highest internal pressure anticipated through the life of the pipeline, which typically is the post-installation hydrotest pressure.For example – most suburban water distribution systems “work” consistently between 60 and 80-psi. Working Pressure: It represents the average service pressure in the pipe, in service, day after day, year after year.What is the internal pressure capacity limit of Class 52 DI pipe?įirst, we should define Pressure Rating versus Working Pressure and Design Pressure: You might just be surprised how versatile Pressure Class DI pipes truly are! Please visit the Thickness Calculator within the McWane Pocket Engineer app or website at pe. to see how, where, and when this is true.

Yet, it needs to be known and understood that pressure class DI pipe is also sufficient for external loading resistance.

Pressure Classes can allow the customer to better tailor the pipe wall selection to certain or specific isolated job requirements.

Most other materials in the industry are classified solely by pressure rating.

Pressure Classes represent the metal wall associated directly to just the internal pressure containment rating of the pipe barrel in question, manufacturing tolerances included.

The three designs considered are internal pressure, barrel deflection, and barrel bending stress: the latter two being from external loading. They represent a grouping of similar design results from a confined range of contributive design variables upon each diameter of pipe.

Thickness classes have no single direct meaning.

Thirty years ago, Pressure Classes (PC) were introduced for the following reasons: These larger diameter nominal walls range from 0.43-inches for a 30-inch class 50 to 0.93-inches for a 48-inch class 56 DI pipe. Wall thicknesses, resulting from the triad of design calculations outlined in the AWWA C150 standard, could range from 0.25-inches for a 3-inch class 51 pipe to 0.56-inches for a 24-inch class 56 DI pipe.ĭuctile iron pipes from 30-inch through 48-inch diameters have wall thickness increases ranging from 0.04 to 0.08-inches per single-digit wall class bump-up, based upon the larger hoop being equally strong yet understandably more flexible than smaller diameters against external loads.Īll of this allows for a custom selection of the most efficient and least-costly iron pipe available for any users' required performance scenario.

For each single-digit increase in the labeled thickness class, the nominal metal wall thickness requirement for DI pipe diameters of 24-inches and smaller increases by 0.03-inches. Modern Ductile iron thickness classes, 50 thru 56, have been around since the mid-'70s.

Piperoll level 52 solution