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see ASME VIII div 1 UG-99 STANDARD HYDROSTATIC TEST(a) A hydrostatic test shall be conducted on all vesselsafter:(1) all fabrication has been completed, except foroperations which could not be performed prior to the testsuch as weld end preparation [see U-1(e)(1)(a)], cosmeticgrinding on the base material which does not affect therequired thickness; and(2) all examinations have been performed, exceptthose required after the test.The completed vessels, except those tested in accordancewith the requirements of UG-100 and UG-101, shall havesatisfactorily passed the hydrostatic test prescribed in thisparagraph.(b) Except as otherwise permitted in (a) above and 27-4, vessels designed for internal pressure shall be subjectedto a hydrostatic test pressure which at every point in thevessel is at least equal to 1.3 times the maximum allowableworking pressure34 to be marked on the vessel multipliedby the lowest ratio (for the materials of which the vesselis constructed) of the stress value S for the test temperatureon the vessel to the stress value S for the design temperature(see UG-21). All loadings that may exist during this testshall be given consideration.(c) A hydrostatic test based on a calculated pressuremay be used by agreement between the user and the Manufacturer.The hydrostatic test pressure at the top of thevessel shall be the minimum of the test pressures calculatedby multiplying the basis for calculated test pressure asdefined in 3-2 for each pressure element by 1.3 and reducingthis value by the hydrostatic head on that element.When this pressure is used, the Inspector shall reserve theright to require the Manufacturer or the designer to furnishthe calculations used for determining the hydrostatic testpressure for any part of the vessel.(d) The requirements of (b) above represent the minimumstandard hydrostatic test pressure required by thisDivision. The requirements of (c) above represent a specialtest based on calculations. Any intermediate value of pressuremay be used. This Division does not specify an upperlimit for hydrostatic test pressure. However, if the hydrostatictest pressure is allowed to exceed, either intentionallyor accidentally, the value determined as prescribed in (c)above to the degree that the vessel is subjected to visiblepermanent distortion, the Inspector shall reserve the rightto reject the vessel.(e) Combination units [see UG-19(a) and UG-21] shallbe tested by one of the following methods.(1) Pressure chambers of combination units that havebeen designed to operate independently shall be hydrostaticallytested as separate vessels, that is, each chamber shallbe tested without pressure in the adjacent chamber. If thecommon elements of a combination unit are designed fora larger differential pressure than the higher maximumallowable working pressure to be marked on the adjacentchambers, the hydrostatic test shall subject the commonelements to at least their design differential pressure, correctedfor temperature as in (b) above, as well as meet therequirements of (b) or (c) above for each independentchamber.(2) When pressure chambers of combination unitshave their common elements designed for the maximumdifferential pressure that can possibly occur during startup,operation, and shutdown, and the differential pressure isless than the higher pressure in the adjacent chambers, thecommon elements shall be subjected to a hydrostatic testpressure of at least 1.3 times the differential pressure Tobe marked on the unit, corrected for temperature as inUG-99(b).Following the test of the common elements and theirinspection as required by (g) below, the adjacent chambersshall be hydrostatically tested simultaneously [see (b) or(c) above]. Care must be taken to limit the differentialpressure between the chambers to the pressure used whentesting the common elements.The vessel stamping and the vessel Data Report mustdescribe the common elements and their limiting differentialpressure. See UG-116(j) and UG-120(b).(f) Single-wall vessels designed for a vacuum or partialvacuum only, and chambers of multichamber vesselsdesigned for a vacuum or partial vacuum only, shall besubjected to an internal hydrostatic test or when a hydrostatictest is not practicable, to a pneumatic test in accordancewith the provisions of UG-100. Either type of testshall be made at a pressure not less than 1.3 times thedifference between normal atmospheric pressure and theminimum design internal absolute pressure.(g) Following the application of the hydrostatic testpressure, an inspection shall be made of all joints andconnections. This inspection shall be made at a pressurenot less than the test pressure divided by 1.3. Except forleakage that might occur at temporary test closures forthose openings intended for welded connections, leakageis not allowed at the time of the required visual inspection.Leakage from temporary seals shall be directed away soas to avoid masking leaks from other joints.The visual inspection of joints and connections for leaksat the test pressure divided by 1.3 may be waived provided:(1) a suitable gas leak test is applied;(2) substitution of the gas leak test is by agreementreached between Manufacturer and Inspector;(3) all welded seams which will be hidden by assemblybe given a visual examination for workmanship priorto assembly;(4) the vessel will not contain a "lethal" substance.(h) Any nonhazardous liquid at any temperature maybe used for the hydrostatic test if below its boiling point.Combustible liquids having a flash point less than 110°F(43°C), such as petroleum distillates, may be used onlyfor near atmospheric temperature tests. It is recommendedthat the metal temperature during hydrostatic test be maintainedat least 30°F (17°C) above the minimum designmetal temperature, but need not exceed 120°F (48°C), tominimize the risk of brittle fracture. [See UG-20 and GeneralNote (6) to Fig. UCS-66.2.] The test pressure shallnot be applied until the vessel and its contents are at aboutthe same temperature. If the test temperature exceeds 120°F(48°C), it is recommended that inspection of the vesselrequired by (g) above be delayed until the temperature isreduced to 120°F (48°C) or less.CAUTION: A small liquid relief valve set to 11⁄3 times the test pressureis recommended for the pressure test system, in case a vessel, while undertest, is likely to be warmed up materially with personnel absent.(i) Vents shall be provided at all high points of thevessel in the position in which it is to be tested to purgepossible air pockets while the vessel is filling.(j) Before applying pressure, the test equipment shallbe examined to see that it is tight and that all low-pressurefilling lines and other appurtenances that should not besubjected to the test pressure have been disconnected.(k) Vessels, except for those in lethal service, may bepainted or otherwise coated either internally or externally,and may be lined internally, prior to the pressure test.However, the user is cautioned that such painting /coating /lining may mask leaks that would otherwise havebeen detected during the pressure test.
What else can I help you with?
Hydrotest of piping?
Use water for testing.
How do you hydrotest a orriface flange pipe spool?
To hydrotest an orifice flange pipe spool, first ensure that the spool is properly assembled and free of any obstructions. Connect the spool to a hydrotest pump and fill it with water, ensuring that all air is purged from the system. Gradually increase the pressure to the specified test pressure, typically 1.5 times the design pressure, and maintain this pressure for a set duration, often a minimum of 30 minutes. Finally, inspect for any leaks or deformations before depressurizing and draining the spool.
What are the duties and responsibilities of hydrotest technician?
A hydrotest technician is responsible for conducting hydrostatic tests to assess the integrity and strength of piping systems, tanks, and other pressure-containing components. Their duties include preparing the test setup, filling systems with water, monitoring pressure levels, and ensuring compliance with safety regulations. They must also document test results and identify any leaks or weaknesses in the systems being tested. Additionally, hydrotest technicians may collaborate with engineering teams to analyze results and recommend necessary repairs or modifications.
Can you hydrotest equipment in the rain in the rain?
Yes, you can hydrotest equipment in the rain, as long as safety precautions are followed and the conditions are manageable. However, wet conditions may affect visibility and increase the risk of slipping or other hazards, so it's essential to ensure that the testing area is safe. Additionally, equipment should be protected from excessive water exposure, which could interfere with the test results or damage sensitive components. Always follow industry guidelines and local regulations regarding hydrotesting in adverse weather conditions.
How do you calculate water volume of pressure vessel for hydrotest?
the amount required to fill the line = (Π/4)*D^2*L where D is the inside dia of the pipeline & L is the length, in your case this amounts to 2281.101 m3 of water.
How do you calculate maximum allowable pressure drop in pipe during hydrotest?
To calculate the maximum allowable pressure drop during a hydrotest, you first determine the pipe's allowable stress and the hydrostatic test pressure, which is typically 1.5 times the design pressure. The allowable pressure drop can then be assessed using the formula: ( \Delta P = \frac{2 \cdot (S \cdot t)}{D} ), where ( S ) is the allowable stress, ( t ) is the wall thickness, and ( D ) is the pipe diameter. Ensure the drop does not exceed industry standards and safety regulations. Always consult relevant codes and standards for specific guidance.
How do you convert a hydro test pressure to a pneumatic test pressure?
Design pressure multiply by 1.1 equal pneumatic test pressure. Design pressure multiply by 1.5 equal Hydrotest Pressure Note: Design Pressure is different from Operating pressure. Design Pressure is equal to Maximum Operating Pressure From: galdo.gaspar@ymail.com
How do you convert a pneumatic test pressure to a hydro test pressure?
Design pressure multiply by 1.1 equal pneumatic test pressure. Design pressure multiply by 1.5 equal Hydrotest Pressure Note: Design Pressure is different from Operating pressure. Design Pressure is equal to Maximum Operating Pressure From: galdo.gaspar@ymail.com
What is the proceduer for replacing timing chain on my 4.3 chev?
first disconnect the battrey then you have to pull all the brackets and stuff of the front of the engine .Then pull the harmonic ballancer (what the bottem pully is bolted to) you will need a harmonic ballancer puller. then you remove the egg shaped cover over the chain and sprockets you will want to line up the timing dots or lines on the gears by turning the engine over with large screw driver. so when you put the new gears and chain on your timing will be right .then just reverse the prosses to put it back together. Good luck!
How do you conduct hydrotest on shell tube heat exchanger?
there are so many test to apply :but commonely three test.shell test (Ring test) to check weather broken tubes or roll leaktube test to check the gasket sealent No#2&5final test (shell test) to check gasket sealent No#1&4
Show the Diagram of manifold for hydrotest test?
1" manifold ( socket welded is preferred) test pressure range : 450-3000 psi: from test pump hose: union-1st block valve-check valve flow--> - first tee down-drain valve for depressurization and drain-second tee up-block valve--lock open for relief valve-relief valve-back to header----third tee up block valve-reducer-pressure gauge--back to header- second block valve-union-adapter to test piece.
Standard procedure for hydrotest on rcc water retaining structures?
As per I.S code 3370 part I & II, there is 40mm tolerance for leakage for R.C.C structures. following method are used for measuring the leakage. 1) if the tank capacity more 6ml, tank should be fill by 1/3 for reading step by step and tress the leakages. 2) After tress, mark the spot and use appropriate method for attend the same. such as epoxy grouting, epoxy material and any other method which is suitable as per site condition. 3) take reading with pizometer and subtract the reading which is received from evaporation pan. take final reading. reading is taken after 24 Hr up to seven day. Adopt this procedure for hydro testing of R.C.C structure. if leakage found more than 40mm. whole procedure should be repeat again.
