(69 kPa) gage and each main to be operated at or above 1 p.s.i. Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. 5.2. Step 6: If the line becomes air-free, then start the pump to pressurize the water inside the pipe of equipment. Step 4: Let the water over flow the high point vent or nozzle, so that the line become air free. (b) If, during the test, the segment is to be stressed to 20 percent or more of SMYS and natural gas, inert gas, or air is the test medium -, (1) A leak test must be made at a pressure between 100 p.s.i. [29 CFR 1910.157(f)(15)(ii)(A)] I must be old. How to calculate hydrostatic test height in tanks - Apiexam The test pressure ratio = 1.25 for hydrotest and for pneumatic leak test. Operators may use other technology or another process supported by a documented engineering analysis for establishing a spike hydrostatic pressure test or equivalent. (b) Each operator must maintain a record of each test required by 192.509, 192.511, and 192.513 for at least 5 years. Login. You can learn more about the process Witnesses reported That the water coming out of the rupture hit a small pile of earth and rocks, projecting the Rocks about 50 meters away at a very high speed. When the test pressure has been reached, the pressuring equipment shall be isolated from the equipment under test and where perform-able disconnected. SD = Safe distance in meters Test pressure 120 (psi) Diameter = 42.000 (inches) Wall thickness = 0.500 (inches) Exposed length = 400 (feet) . Close this window and log in. arrow_forward. PDF Pressure Testing (Hydrostatic / Pneumatic) Safety Guidelines Title 49 was last amended 2/03/2023. Safe distance during Piping hydrotest - Eng-Tips Forums This hydrostatic pressure calculator determines the pressure that arises at a certain depth of a liquid. ASME B31.3 Process Piping Allowable Bolt Load And Bolt Stress Calculation Module, ASME B31.3 Process Piping Basic Allowable Stress Calculation Module, ASME B31.3 Process Piping Bend Calculation Module, ASME B31.3 Process Piping Blank Flange Calculation Module, ASME B31.3 Process Piping Branch Reinforcement Calculation Module, ASME B31.3 Process Piping Design Factor Calculation Module, ASME B31.3 Process Piping Design Pressure Calculation Module, ASME B31.3 Process Piping Elastic Modulus Calculation Module, ASME B31.3 Process Piping Fluid Velocity And Flow Rate Calculation Module, ASME B31.3 Process Piping Fluid Volume And Mass Calculation Module, ASME B31.3 Process Piping Hoop Stress Calculation Module, ASME B31.3 Process Piping Line Pipe Schedule Calculation Module, ASME B31.3 Process Piping Mass And Weight Calculation Module, ASME B31.3 Process Piping Minimum Temperature For Impact Testing Calculation Module, ASME B31.3 Process Piping Plastic Component Calculation Module, ASME B31.3 Process Piping Stress Factor And Flexibility Calculation Module, ASME B31.3 Process Piping Thermal Expansion Calculation Module, ASME B31.3 Process Piping Wall Thickness Calculation Module, DNVGL RP F115 Pipeline Pre Commissioning Calculation Module, CALCULATOR : ASME B31.3 Section 345 Pipe Test Pressure And Hoop Stress Check (Low Pressure Steel Piping), CALCULATOR : ASME B31.3 Section K345 Pipe Test Pressure And Hoop Stress Check (High Pressure Steel Piping), CALCULATOR : ASME B31.3 Section A345 Pipe Test Pressure And Hoop Stress (Low Pressure Plastic Piping), CALCULATOR : ASME B31.3 Pipe Hydrotest Liquid Volume And Dose Rate, CALCULATOR : ASME B31.3 Pipe Leak Test Gas Volume And Dose Rate, CALCULATOR : ASME B31.3 Metal Pipe Diameter And Wall Thickness Schedule, CALCULATOR : ASME B31.3 Table A-1 Low Pressure Metal Pipe Yield Stress Tensile Stress And Basic Allowable Stress Schedule, CALCULATOR : ASME B31.3 Table K-1 High Pressure Metal Pipe Yield Stress Tensile Stress And Allowable Stress Schedule, CALCULATOR : ASME B31.3 Pipe Test Pressure And Hoop Stress Check (General), CALCULATOR : ASME B31.3 Metal Pipe Maximum And Minimum Diameter Schedule, CALCULATOR : ASME B31.3 Section A328.2 Pipe Qualification Test Pressure (Low Pressure Plastic Piping), ttoltype : Wall Thickness Fabrication Tolerance Type, xfu : User Defined Negative Wall Thickness Fraction, tfu : User Defined Negative Wall Thickness Allowance, walltype : Hoop Stress Wall Thickness Type, St : User Defined Allowable Stress At Test Temperature, S : User Defined Allowable Stress At Design Temperature, Pru : User Defined Component Rated Pressure, OD/tn : Diameter Over Wall Thickness Ratio, Pt/P : Test Pressure Over Design Pressure Ratio, Sh/Sy : Hoop Stress Over Yield Stress Ratio ( 1), t* : Wall Thickness For Hoop Stress Calculation, tf : Wall Thickness Fabrication Allowance, dtoltype : Diameter Fabrication Tolerance Type, OD*/tn : Diameter Over Wall Thickness Ratio, c : Total Corrosion Allowance (Internal And External), DRu : User Defined Dimension Ratio SDR OR SIDR, St : User Defined Hydrostatic Design Stress At Test Temperature, S : User Defined Hydrostatic Design Stress At Design Temperature, HDB : Hydrostatic Design Basis At Test Temperature, Sh/HDB : Hoop Stress Over HDB Ratio ( 1), Rvu : User Defined Dose Volume Over Gas Moles Ratio, Rmu : User Defined Dose Mass Over Gas Moles Ratio, txu : User Defined Negative Wall Thickness Fraction, SMTSu : User Defined Specified Minimum Tensile Stress, SMYSu : User Defined Specified Minimum Yield Stress, S/SMTS : Basic Allowable Stress Over SMTS Ratio, S/SMYS : Basic Allowable Stress Over SMYS Ratio, hooptype : Hoop Stress Wall Thickness Type, OD/tn : Pipe Diameter Over Wall Thickness Ratio, Sh/SMYS : Hoop Stress Over Yield Stress Ratio, th : Hoop Stress Thickness (Pressure Containment), D/tn : Pipe Diameter Over Wall Thickness Ratio. Use the Result Table option to display the pipe schedule with nominal wall thickness, minimum wall thickness and pressure design wall thickness for the selected diameter. (6) Elevation variations, whenever significant for the particular test. All equipment, plant, and devices used for pressure and leak testing are properly rated, adequately calibrated, maintained, and checked. For hydrotest the test factor = 1.5. By joining you are opting in to receive e-mail. (b) The test procedure must insure discovery of all potentially hazardous leaks in the segment being tested. Environment, Safety & Health Division Pressure Systems | Pressure Test Procedures . Calculate high pressure metal pipe SMYS (Specified Minimum Yield Stress), SMTS (Specified Minimum Tensile Stress) and allowable stress schedule (ASME B31.3 table K-1). For pneumatic test the test factor = 1.1. Wear face shields during pneumatic testing. In the event of a failure during the pressure test, the system will be immediately depressurized by cracking the vent on the test pump manifold. Occupational Safety and Health Administration Please tell me what means of a and this p Appropriate measures to manage the risk of a potential testing failure must be considered. See our buoyancy calculator for more information. You can verify it by following the next procedure: To increase hydrostatic fluid pressure at a specific point, we have to increase the vertical distance between the water source and the point. Online calculator: Hydrostatic pressure - PLANETCALC It specifies to use 1 million. The pressuring valve should be locked in a closed position. Click Here to join Eng-Tips and talk with other members! Calculateminimum safe distances between the piping system being pneumatically tested and personnel/plant facilities using ASME PCC-2 Mandatory Appendix 501-II and III equations. Enhanced content is provided to the user to provide additional context. (b) Other technology or other technical evaluation process. (276 kPa) gage must be given a leak test at a pressure of not less than 50 p.s.i. Organization and Purpose Reference : ANSI/ASME B31.3 : Process Piping (2018), [FREE] tools are free in basic mode with no login (no plots, tables, goal seek etc). You deserve for appreciation. These devices should be clearly visible to the person controlling the pressure. For the Hydro test. (b) Each segment of a service line (other than plastic) intended to be operated at a pressure of at least 1 p.s.i. ASME Code B 31.3 provides the basis for test pressure. 30 U.S.C. 192-60, 53 FR 36029, Sept. 16, 1988; Amdt. The ASME B16.5 Class 2500 pressure temperature rating for the material group is often used as a criteria. %PDF-1.6 % Already a Member? The cause of failure shall be determined and rectified before any further pressure testing is undertaken. In a pipe 20 mtr long a pressure gauge (P2) is installed 0.5 mtr before outlet and at other end fluid is pumped in pipe at certain intial pressure P1.A flowmeter is installed in line just before P2. regarding that Frequency calculation LTI x 1000000/man-hours worked. Keep going. How do you calculate the safe distance to Hydrotest? 5- People working near the line under pressure should be reminded to keep the safety distance out of line. A tank will be subjected to hydrostatic testing after repairs. HDwr'mK7 SE8+x8am}k]Y`K"CzmBL`YBwNFVk;2#(,e} y/[L&S akbuJ9Kf:DQ.w]06~cv'{Y$ D\gd8 For pressure testing of a component that will be used in service, the pressure is usually 1.3 - 1.5 x design pressure, which keeps the material from yielding, but subjects it to more stress that it will see in service. A positive means of . ASME B31.3 Test Pressure Calculators - Pipeng Toolbox Registration on or use of this site constitutes acceptance of our Privacy Policy. For ASME III piping and tubing systems the hydrostatic test pressure is often 1.25 P design to which are typically added a 6% code margin and a 75 psi test margin. I have made my own calculation spreadsheet based on PCC. Using this test helps maintain safety standards and durability of a vessel over time. PRESSURE TESTING (Hydro & Pneumatic) SAFETY PROCEDURE - RLS HUMAN CARE 26, 1996; Amdt. However, inspectors still have to crawl over the unit to look for leaks. Safe distance = (0.15)x(D)x(a)^0.4x(p)^0.6. View the most recent official publication: These links go to the official, published CFR, which is updated annually. 1 CFR 1.1 Hydrostatic Test and Pneumatic Test of Piping Systems-Hydrotest Vs For pneumatic test the test factor = 1.1. Hydrostatic pressure is a specific type of pressure. Know how to handle a hammer -Safety Moment #4, Ticks Threats when working outdoors -Safety Moment #16, https://www.youtube.com/watch?v=kVdFZ9ToI9U&list=PLv2vIPIAyhPCciKJpWSbvKoKqkHhig1Q9, Tool Box Talk: Dont Let Chemicals Get to You, Tool Box Talk: Winter Driving Safety Tips, Tool Box Talk: Working Around Heavy Equipment, Photo of the day: Hearing Protection Device Selection, Free ISO 14001:2015 Environmental Management System Audit Checklist Download. Test requirements for pipelines to operate at a hoop stress less than 30 percent of SMYS and at or above 100 p.s.i. (thread292-225652: Hydrostatic Testing Safety) Safe distance during hydrotesting. Hydrotest - an overview | ScienceDirect Topics Consenting to these technologies will allow us to process data such as browsing behavior or unique IDs on this site. The pneumatic test pressure shall not be less than 1.2 nor more than 1.5 times the design pressure of the piping system. Since the value of stored energy is 224,057,795 J the safe distance to be maintained as per this section is 60m. About this app. Hydrostatic Pressure = 1.3 x MAWP or Design Pressure x ( stress value at Test Temperature / stress value at design temprature ). If the test temperature is lower than the operating temperature, the design pressure should be multiplied by the ratio of the design stress at the test temperature, over the design stress at the operating temperature (except for low pressure pneumatic test). 11, 2015; 86 FR 2241, Jan. 11, 2021]. The result will be. (c) Except as provided in 192.505(a), if air, natural gas, or inert gas is used as the test medium, the following maximum hoop stress limitations apply: (d) Each joint used to tie in a test segment of pipeline is excepted from the specific test requirements of this subpart, but each non-welded joint must be leak tested at not less than its operating pressure. Pneumatic test Hydropneumatic test Alternative leak test. *Eng-Tips's functionality depends on members receiving e-mail. . Use the Result Table option to display the stress values for the selected stress schedule (click the Result Table button, and then click the make table button). Hydrostatic & Pneumatic Pressure Testing Company - NiGen For gases (4.3) it is : l = 30; 3.6 x cube root of (volume x ( (test pressure + length) - ( (test pressure + length . For plastic pipe use the Barlow's equation mid wall option, with the pipe nominal diameter. (a) No person may operate a new segment of pipeline, or return to service a segment of pipeline that has been relocated or replaced, until -, (1) It has been tested in accordance with this subpart and 192.619 to substantiate the maximum allowable operating pressure; and. where D Internal diameter (m) What are you going to tell your boss when your colleague gets hit by a projectile - saying that user ET123 is responsible? Safety valves to be fitted when the pressurizing medium pressure Single, continuous pressure envelope is the preferable method. Displaying title 49, up to date as of 3/02/2023. Hydro testing safe distance formula: For the Hydro test safe distance Safe distance = (0.15)x(D)x(a)^0.4x(p)^0.6. 192-58, 53 FR 1635, Jan. 21, 1988; Amdt. The test pressure should be less than or equal to 1.33 x the design pressure, and less than or equal to 1.35 x the rated pressure for components. Testing should be carried out underPTW, which is required for each test or at least a test package for the same location. Hydrostatic Testing - an overview | ScienceDirect Topics Thanks. This is an automated process for The calculated volume does not include the effect of pipe expansion due to the test pressure. How to Calculate Hydrotest Pressure as per ASME & PED Close this window and log in. Thanks Mr. Saurabh for giving us good informations. ASME PCC-2-2008, Article 5.1, Mandatory. Refer to a standard for safe distance calculations Select the pipe schedule type, diameter, wall thickness and diameter tolerance, or use the user defined option. For B31.1 piping systems the hydrotest pressure is often 1.5 P design to which is added a 75 psi test . or existing codification. If an inspection is required within the hold period, then pressure should be reduced to 80% of the test figure. 192.506 Transmission lines: Spike hydrostatic pressure test. Our hydrostatic pressure calculator uses the below hydrostatic pressure formula: p = g h + p0, where: p - Hydrostatic pressure; - Density of fluid; g - Gravitational acceleration (the average value for the Earth is g = 9.80665 m/s ); h - Depth; and. Best Tips for Hydrostatic Pressure Test Safety - The Safety Blog on Example - Pressure acting in water at depth 1 m . Ensure the equipment tested by the competent person, prior to testing. 6. The dose rate can be calculated from dose volume fraction, dose mass fraction or dose gas ratio. Have you ever wondered what is the pressure level in water compared to the atmospheric pressure? Keep a safe distance during the pressure test to minimize safety risk. After watching this video you will be able to calculate safe distance for hydro testingwhat is the formula to calculate safe distance during hydro testing.ho. Calculation of SAFETY DISTANCE for pressure testing Hydrostatic Pressure Calculator | How to find Hydrostatic Pressure mGK#i`(()C"-LJe$:D 5.@!D|[iXQY[x.7Cl%>>XCS1#r#ja|#r*2E55Pepm 890 0 obj <> endobj Help Using The Pipeng Toolbox (opens in the popup workbook). Please let us know here why this post is inappropriate. 2)For hydros testing, a nonhazardous liquid such as water shall be used at temperatures below 32C and over 10C to aid in avoiding condensation during the test. No. eCFR :: 49 CFR Part 192 Subpart J -- Test Requirements TNT = S t o r e d E n e r g y 4, 266, 920 (kg) as per equation II-3 from ASME PCC-2 Appendix 501-II. 192.505 Strength test requirements for steel pipeline to operate at a hoop stress of 30 percent or more of SMYS. Already a Member? (Read more:E-booksthe-safe-isolation-of-plant-and-equipment). Then, calculated hydrostatic force and center of pressure on the vertical face of the quadrant can be compared with the experimental results. Static pressure in pipe flow? | ResearchGate 7.1 Hydrostatic Force (c) The test pressure must be at least 150% of the maximum operating pressure or 50 psi (345 kPa) gauge, whichever is greater. where D - Internal diameter (m) a - Length/diameter of the piece (m) p - Test pressure (bar) Safe Distance and Stored Energy Calculator for Piping - Pneumatic Test. 192.509 Test requirements for pipelines to operate below 100 p.s.i. The formula for hydrostatic pressure is \(p=\rho\times g\times h\) Where, p = the pressure exerted by the liquid in \(N.m^2\), Pa. = the density of the liquid in \(kg.m^3\) g = the acceleration due to gravity = \(9.81ms^2\) h = the height of the fluid column in m. Steps to Calculate Hydrostatic Pressure Hydrostatic testing involves filling the vessels, pipeline or system (which need to be tested) with water, then pressurized with a hydraulic pump until the test pressure reaches (normally 1.5 times design pressure), hold the pressure for a specified time by shutting off the supply valve and checking for any leakage or pressure drop. SAFE DISTANCE CALCULATION HYDROTEST. L Minimum Safety Distance, Meter (b) In a Class 1 or Class 2 location, each compressor station regulator station, and measuring station, must be tested to at least Class 3 location test requirements. thanks, where D Internal diameter (m) This app is build to calculate Hydro-test pressure required for Pressure vessel and piping system. And Thank you. 192-85, 63 FR 37504, July 13, 1998; Amdt. Glen safety manual - pressure system safety w/change 1 (6/27/2014) and ASME PCC-2 are also useful documents. For fluids (3.3) it is.. This document is available in the following developer friendly formats: Information and documentation can be found in our F-&9= This video explains How to Calculate the Hydrotest pressure of Vessels and Piping systems as per ASME & PED. Hai hello sir Iam Vignesh testing pressure of hydraulic and pneumatic and any calculation any basic principle please, Good and well done job for your good innovation to enlighten others in this industry of health and safety . (689 kPa) gage must be tested in accordance with the following: (a) The pipeline operator must use a test procedure that will ensure discovery of all potentially hazardous leaks in the segment being tested. here. Operators must notify PHMSA 90 days in advance of the assessment or reassessment requirements of this subchapter. [35 FR 13257, Aug. 19, 1970, as amended by Amdt. (1) Compatible with the material of which the pipeline is constructed; (2) Relatively free of sedimentary materials; and. OSHA Safety Distance Calculator | Machine Guarding Safety Distance (b) Each main that is to be operated at less than 1 p.s.i. Barricade the testing area to control unauthorized entry. The system is tested while assembled or partially assembled, based on the particular system. t0 2&Q-N:kI&xZvYZC//uRG14N0qY6DRv/)8Xgv'aZ+A^:V ; >RdyyeWQHu:m&n\'TMrRYl$-WZ"ID8I{\,}Ka6!D j5wx!*Q,NEc. Hydrostatic Pressure Formula is given by the equation p = * g * h + p0. Position the balance arm on the knife edges and check that the arm swings freely. Hydrotest Calculator - McWane (b) The operator shall insure that the test medium is disposed of in a manner that will minimize damage to the environment. a Length/diameter of piece (m) Q1. why not 2000000 & 3000000 ? Thanks in advance, Sandeep Kumar safety officer Mo no 9708174394 email Id sandeephse4394@gmail.com. Access to the test area must be limited to essential personnel only barriers, warning signs, PA announcements, patrolling the test boundaries. user convenience only and is not intended to alter agency intent What is the pressure acting on the water at a depth of 1m at 4C? Consideration to be given for the change of ambient temperature, e.g. The involved section was a bent pipe. The hoop stress should be less than or equal to 90% of yield. 20. Calculate ASME B31.3 general pipe test pressure and hoop stress check from operating pressure, diameter, wall thickness, wall thickness tolerance and design stress. Hydrostatic Pressure Calculator Hydraulics Fluids Online Unit Overview. Hydrostatic Pressure Calculator. Calculating the safe distance (R) in accordance with equation below. full text search results Formula: D s = 63 x T s. where, D s = Minimum Safety Distance *, 63 = OSHA recommended hand speed constant in inches per second, and. (c) Each segment of a service line (other than plastic) intended to be operated at pressures of more than 40 p.s.i. LTI x 1000000/ Man hours worked what is the base of 1000000. Can you calculate for me for 6inch pipe, 40 meter length and 170 bar pressure testing. . The dose rate can be calculated from the dose volume fraction, the dose mass fraction, the dose volume ratio, or the dose mass ratio. The test pressure ratio = 1.5 for hydrotest, and 1.1 for pneumatic leak test. p = g h Blanking devices (spades blinds etc.) 2. The pressure design wall thickness is recommended for corroded piping. 192.515 Environmental protection and safety requirements. The R factor is the ratio of allowable stress at the test temperature over the allowable stress at the design temperature. Inspect all equipment you use for the test such as hoses, pressure gauge, piping, . Hydrotest formula | Math Tutor ASME Hydrostatic Test Requirements & Standards | Petersen The R factor is the ratio of allowable stress at the test temperature over the allowable stress at the design temperature. (689 kPa) gage. Add water to the tank and allow time for the water to settle. Pressuring equipment shall be provided with suitably calibrated pressure control/regulator devices. Hydrostatic Pressure Formula. 192-58, 53 FR 1635, Jan. 21, 1988; Amdt. The test a Pressure was more than 330 bars. Very high-pressure hydro-testing use the testing manifold and testing apparatus No alterations or modification permitted without Piping Production Engineers approval. You are using an unsupported browser. 192.511 Test requirements for service lines. a is length / diameter of piece. 5, 2021]. The safe evacuation of test liquids/gases. please contact me in hasbi.sinaga@gmail.com The standard hydrostatic test procedure for pipelines entails the following steps: Fill the pipeline with a liquid, mostly water, unless its material is incompatible with water. Pressure change "proportional" to volume change [P1V1= P2V2], Air filled balloon "pops" large, instantaneous energy release, Pressure changes finite amount by infinitesimal change in volume, Bulk modulus, K = 316,000 psi K = - P / [V / V], Water filled balloon does not "pop" no compressive energy, 4.44 lbf -ft is a small number that can be readily grasped, Typically, sudden energy release comparisons are made to a TNT equivalent 294,815 lb-ft = 0.2 lb TNT, TNT equivalent given as 1 kg TNT* = 4.184 x 106 J [1], or 1 lb TNT* equivalent = 1.4 x 106 lb-ft, *Note that some sources give 1 kg TNT = 4.63 x 106 J. This hydrostatic pressure calculator determines the hydrostatic pressure acting on an object floating at a certain depth in a liquid. Consideration to be given for the change of ambient temperature, e.g. hbbd```b``.dd"rwV9,nw`0 =$[JA w u g27{#3*rH"W B[ SAFE DISTANCE COMMONLY USED FOR PNEUMATIC TESTS For Stored Energy Less than 27,134KJ Minimum safe Distance= +100Ft =31Mtr For Stored Energy Greater than 27,134KJ Minimum safe Distance= +150Ft =46Mtr The maximum calculated stored energy of any vessel or piping system being pneumatically pressure . Hydro Static Pressure Calculation For Pressure Vessels and Piping Hydrostatic Pressure Formula. 185(w)(3), 49 U.S.C. The volume of equipment under test should be kept as small is greater than the test pressure. (a) An operator must make, and retain for the useful life of the pipeline, a record of each test performed under 192.505, 192.506, and 192.507. (6.9 kPa) gage must be tested to at least 10 p.s.i. PDF MCAA Guide to Pressure Testing Safety What is the base of 1000000 ? What determines the pressure? If an inspection is required within the hold period, then pressure should be reduced to 80% of the test figure. This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. Notify me of follow-up comments by email. 192-77, 61 FR 27793, June 3, 1996; 61 FR 45905, Aug. 30, 1996; Amdt. Hydrostatic Test. Only essential personnel are allowed access to the test area, and then only after pressure has been held for a reasonable period. (2) The baseline test pressure must be as specified in the applicable paragraphs of 192.619(a)(2) or 192.620(a)(2), whichever applies. The hoop stress should be calculated from the pressure difference during testing. Design pressure. Calculate ASME B31.3 metal pipe maximum and minimum diameter from diameter tolerance. y#TJ>lwV) b NH This pressure is usually greater than the pipeline's design working pressure. For hydrotest and component pneumatic tests the test factor = 1.25. distance limit for personnel during the pneumatic test. The code reference given was Norwegian specification T0240|72-12| and in the footer Rules, issue 96-02. what is it exactly ?? do yo have valid reference? This site uses Akismet to reduce spam. For most cases external pressure can be ignored. 192-93, 68 FR 53901, Sept. 15, 2003; Amdt. Hydrostatic Test Plan - Government of New York 3. T s = stopping time of the press measured at approximately 90 position of crankshaft rotation. For piping systems with combined internal and external pressure during operation, the test pressure should be calculated from the internal pressure only. 26 October 2021 SLAC-I-730-0A21C-033-R004 3 of 8 .