Engineering Analysis
Free reference calculators for horizontal directional drilling and pipeline design — built on ASME B31.4/B31.8, API 1102, ASTM, and PRCI standards. Each opens directly in the Pipeline Planning Toolbox with your project data.
Design HDD bore profiles and pipeline alignments on an interactive 50-state map with 60+ environmental, utility, and subsurface layers, paired with a vertical profile showing entry/exit angles, bend radius, and depth of cover.
Vertical cross-section of the alignment showing entry and exit angles, design radius, tangent and curve segments, depth of cover, and soil stratigraphy from boring logs — with a station–elevation summary of every PC, PT, and tangent point.
Verify as-drilled HDD pilot-hole curvature, bend angles, and minimum radius against design tolerances to confirm the path is drillable and within allowable pipe strain — per ASCE MOP 108 and ASTM F1962.
Calculate the minimum surface-to-surface HDD length needed to reach a target depth of cover given entry/exit angles and minimum allowable bend radius — per ASCE MOP 108.
Estimate the total water and drilling-fluid volume for an HDD pilot hole and reaming passes from borehole geometry, soil type, and mud-recycling efficiency — for water sourcing and disposal planning per ASCE MOP 108.
Calculate combined axial, bending, and hoop stresses on an in-service pipe after HDD installation, including residual curvature and external overburden loading — per ASCE MOP 108 and PRCI PR-227-9424.
Evaluate tensile pull-back load, bending strain, and external-pressure collapse for polyethylene (PE/HDPE) pipe installed by HDD — per ASTM F1962 and PPI TR-46.
Predict the maximum allowable downhole annular fluid pressure to avoid hydraulic fracture of the soil and inadvertent returns (frac-out) during HDD — using the Delft (Luger–Hergarden) method and PRCI guidance.
Free bentonite yield calculator for HDD drilling fluid. Estimate mud yield in barrels per 100 lb of bentonite from mix ratio, water chemistry, and viscosifier content for pilot-hole and reaming passes — per API 13A / 13B-1.
Size set-on/bolt-on river weights and their spacing, or continuous concrete weight-coating thickness, to offset pipe buoyancy in flooded bores, water crossings, and submerged service — per PRCI guidance, ASCE MOP 108, and ISO 21809-5.
Sizes the continuous concrete weight-coating thickness needed to hold the pipe down to a target negative buoyancy in flooded bores, wetlands, and submerged crossings, from pipe geometry, coating density, and fluid unit weight.
Calculates the center-to-center spacing of set-on or bolt-on concrete river weights required to hit a target buoyancy ratio, given weight mass, unit weight, and the net uplift on the coated pipe.
Estimate ground-surface settlement above an HDD bore from volume loss and soil disturbance along the alignment, using the Peck (1969) settlement-trough method and ASCE MOP 108 guidance.
Free online HDD pullback force analysis. Estimate the pull-back tension to install a steel or PE pipe by horizontal directional drilling — fluid drag, borehole friction, buoyancy, and capstan effects per ASCE MOP 108 and PRCI PR-227-9424.
Calculate the maximum allowable pullback force and minimum allowable bend radius that keep combined HDD installation stresses within code limits for steel and PE pipe — per ASCE MOP 108, ASTM F1962, and PRCI.
Determine roller-cradle spacing on the HDD staging/pullback side so the pipe string’s bending stress and sag stay within allowable limits before bore entry — per ASCE MOP 108.
Calculate the maximum distance between pipe supports from allowable bending stress, deflection, and self-weight plus contents, for aboveground or temporary support conditions — per MSS SP-69 and ASME B31.1.
Calculate jacking thrust force and casing stresses for horizontal auger-bore installations, including soil-skin friction and end bearing — per ASCE MOP 106 for horizontal auger boring.
Reference overview of trenchless installation methods — HDD, auger boring, microtunneling, and pipe ramming — with selection criteria by soil and site conditions, per ASCE MOP 108 and MOP 106.
Reference guide to HDD rig classes, mud systems, reamers, and downhole tooling by bore diameter and ground condition — per ASCE MOP 108.
Reference for interpreting geotechnical boring logs, USCS soil classifications, and the parameters most relevant to HDD and trenchless design — per ASTM D2487 and ASCE MOP 108.
Evaluate earth (overburden) and live (traffic) loads on a buried pipe installed by conventional open-cut trenching, including bedding, deflection, and backfill conditions — per AWWA M11 and ASME B31.4/B31.8.
Evaluate bending, tensile, and combined stresses in a pipeline during lowering-in from the right-of-way into the trench — accounting for sag, hold-down positions, and sideboom spacing — per API RP 1117 and ASME B31.4/B31.8.
Checks mainline valve spacing against the maximum intervals PHMSA sets for each class location, so an operator can confirm sectionalizing-valve placement and blowdown provisions on a transmission line.
Searchable reference of standard steel line-pipe dimensions, wall thicknesses, weights, and grades for quick lookup during design — based on API 5L and ASME B36.10M.
Pipe SMYS analysis for steel line pipe. Compute hoop stress, %SMYS, and maximum allowable operating pressure (MAOP) from OD, wall thickness, grade, and design factor using Barlow’s equation — per API 5L and ASME B31.4 / B31.8.
Sizes distribution and service piping for a required delivery load and allowable pressure drop, comparing candidate diameters and materials across low- and elevated-pressure sizing methods.
Steady-state flow and pressure-drop analysis for gas transmission lines using the Panhandle A/B, Weymouth, and AGA fully-turbulent equations, with compressibility, elevation, and pipeline-efficiency corrections.
Determines the required valve flow coefficient (Cv) for gas or liquid service and screens the operating range for choked flow, critical pressure drop, and excess velocity or noise.
Estimates the time to depressurize a pipeline segment through a blowdown valve or vent stack from segment volume, initial and target pressure, gas properties, and vent size.
Calculate the reaction thrust generated by venting pressurized gas through an open end during blowdown — used to size restraint, thrust blocks, and personnel exclusion zones per ASME B31.8 and API Std 521.
Online API 1102 analysis for steel pipelines crossing highways and railroads. Compute earth load and cyclic wheel/rail live-load stresses (Cooper E-80) for cased and uncased crossings per API RP 1102.
Check barrel, circumferential, and longitudinal stresses for uncased pipeline crossings under roadway and rail loading, with impact and depth-of-cover effects — per API RP 1102 and ASME B31.8 / B31.4.
Evaluate buried-pipe stresses from highway vehicle wheel loads, including dynamic impact factor and load distribution through cover soil — per API RP 1102 and AASHTO LRFD.
Evaluate buried-pipe stresses from railroad live loads (Cooper E-80 or equivalent) beneath tracks, including impact and load-cycle effects — per API RP 1102 and the AREMA Manual for Railway Engineering.
Find the minimum allowable bend radius for a pull section under hydrostatic test — where rough terrain forces the strung pipe into tight bends — keeping combined hoop plus longitudinal stress below the code-specified percentage of SMYS per ASME B31.4 and B31.8.
Hydrotest water volume analysis for pipelines. Estimate fill volume, test pressure, and static-head corrections across the elevation profile for hydrostatic test planning — per API RP 1110, ASME B31.4 / B31.8, and 49 CFR.
Relate hydrostatic test pressure change during the hold period to air entrainment, temperature drift, and leak volume — to distinguish thermal effects from a real leak, per API RP 1110 and ASME B31.8 Appendix N.
Calculate the Potential Impact Radius (PIR) around a gas pipeline — the area of significant thermal impact from a full-bore rupture — for integrity management and High Consequence Area (HCA) classification per ASME B31.8S.