LSAW Pipe Hydorstatic Test?
LSAW pipe Hydrostatic test is the most common way used for LSAW pipe inspection. A hydrostatic test is a way in which pressure vessels such as pipelines, plumbing, gas cylinders, boilers and fuel tanks can be tested for strength and leaks.
LSAW Pipe hydrostatic test is an important part in lsaw manufacturing includes filling the pipe with water, which may be dyed to aid in visual leak detection. And pressurization of pipe to the specified test pressure. Pressure tightness can be tested by shutting off the supply valve and seeing if there is a pressure loss.
The location of a leak can be visually found more easily if the water contains a colorant. Using hydrostatic test helps ensure safety standards and durability of a vessel over time. Newly manufactured LSAW steel pipes are initially qualified using the hydrostatic test. Inspection of pressure vessels for transport and storage of gases is very important as such pipes can explode if they fail under pressure.
LSAW Pipe Hydrostatic Test Requirements
Test pressures for lsaw steel pipe with D≤457mm (18.000 in), shall be held for not less than 5 seconds. Test pressures for weld pipe with D>457mm(18.000 in) shall be held for not less than 10 seconds. For threaded and coupled pipe, the test shall be applied with the couplings made up power-tight if agreed, except that pipe with D>323.9mm (12.375 in) many be tested in the plain-end condition. For threaded pipe furnished with couplings made up handling-tight, the hydrostatic test shall be made on the pipe in the plain-end, threads-only or coupled condition unless a specific condition is specified in the purchase order.
Verification of Hydrostatic Test
In order to ensure that every length of pipe is tested to the required test pressure, each tester, except those on which only continuous welded pipe is tested, shall be equipped with a recording gauge that can record the test pressure and the test duration for each length of pipe, or shall be equipped with some positive and automatic or interlocking device to prevent pipe from being classified as tested until the test requirements (pressure and duration) have been met. Such records or charts shall be available for examination at the manufacturer’s facility by the purchaser’s inspector, if applicable.
The pipe shall withstand the hydrostatic test without leakage through the weld seam or the pipe body. The hydrostatic test pressure, P, expressed in megapascals (pounds per square inch), for plain-end pipe shall be determined using Equation P=2St/D, with the results rounded to the nearest 0,1 MPa (10 psi):
S is the hoop stress, expressed in megapascals (pounds per square inch), equal to a percentage of the specified minimum yield strength of the pipe, as given in Table below;
t is the specified wall thickness, expressed in millimetres (inches);
D is the specified outside diameter, expressed in millimetres (inches).
We take hydrostatic test for 100% pipes under API 5L specification. We are professional Steel Pipe mill. And we will do our best to support high quality longitudinal submerged arc welded pipe for you.
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