Distributed Static Surcharge Load: Directly Beneath a Surcharge Load In this approach the active earth force is calculated due to simultaneous effect of both the soil weight and the surcharge of strip load over the pipe to determine earth pressures. Dead/Earth Load A. Prism Load ππΒ = π€π» ππΒ = Vertical Soil…
Wall Thickness Polyethylene Pipe Wall thickness must meet minimum thickness in accordance to DOT 192.123. π = Internal pressure ,psi. π = Hydrostatic Design Basis, ,psi. π· = Outside Diameter ,in. π‘ = Minimum Wall Thickness ,in. πΉ = Design Factor Input Parameters 1.Β Β Β Β To create a new case, click the…
Design Pressure Polyethylene Pipe Polyethylene Line Pipe is designed in accordance to API 15LE based on material designation of specified pipe size and wall thickness, standard dimension ratio, temperature and design factor i.e. 0.32. Limitations include pressure in distribution and class 3/4 areas, temperatures below -20 degrees and above 150…
Polyethylene Pipe Introduction The Pipeline Toolbox is home to many tools and calculators. The PLTB Userβs Guide presents information, guidelines and procedures for use during design, construction, operations and integrity tasks for field or office applications. When selecting pipe materials, designers, owners and contractors specify materials that provide reliable, long-term service…
Pack In Pipeline Calculates using gas packed in an isolated section of the pipe. It uses PLTB Gas Lost in a Full-Bore Rupture calculation in the Accidental Release Module. Upstream and downstream pressures must be known at the time of calculation. In addition, the actual internal diameter and gas temperature…
Purging Calculations Find flow rate through the blow-off valve by using the formula for critical velocity, Method A – Finding the flow rate through the blow off valve(s) using a modified Weymouth formula for critical velocity. Method B where pipe section is assumed to be filled with air prior to…
πππ£πΒ β Average Initial Pipeline Pressure[psi] ππΒ β Base Pressure[psi] πΒ =Β πππ£πΒ +Β ππ π‘Β β Temperature[β] πΏΒ β Length of Pipeline[mi] π·Β β Pipe Inside Diameter[in] π§Β β Shut in Time[hr] π Β β Constant[10.7316] ππ‘Β β Initial Test Pressure[psi] π‘Β β Temperature[β] ππΒ βTemperature Base[Β°R] ππΒ β Volume Lost[MSCF] ππΒ β Blowdown Time[min] π·π Β β Inside Diameter of Blowdown Stack[in] πΊΒ β Gas Specific Gravity πΒ β…
Gas Pipeline Blowdown – Semiemperical Model – Report No. 87-2 Based on SW Research Report calculations for the blowdown time and mass of gas vented to atmosphere to a piping system. Accurate to within a few percent. Blowdown time is impacted through constricting valve changes from sonic (choked) flow to…
Pipeline Hydrostatic Testing Hydrostatic testing is a method to determine strength, expose defects, expose leak & validate integrity of the vessel. Typically, tests are conducted at 125% of MAOP. These tests are limited to defects that are ready for failure such as cracks. The test pressure must be adjusted for…
API 1104 Appendix A: Weld Imperfection Assessment Determination of Acceptable Imperfection Size by Option 1 Two sets of acceptance criteria are given, depending on the CTOD toughness value. When the CTOD toughness is equal to or greater than 0.010 in. (0.25 mm), the maximum acceptable imperfection size is given in…