Dear All, Thanx to all of u for replying my query, but pl. go thru following points: 1) Spool was constructed as per ASME B 31.3. 2) 1st failure- test carried out during night (2100hrs) & regularly showing drop in pressure on press.gauge (may be because of temp. drop in surrounding atmp.) but no leakage through the system. Test stopped. 3) 2nd failure- test carried out next day at 1000 hrs & rejected due to leakage from blind flange from one end. 4) 3rd failure- test carried out at 1600 hrs. & rejected due to leakage from flange joint. Due to continious testing is there any chance of developing stresses in parent metal which may affect further testing. Thanx & Regds, PSP
--- On Fri, 12/8/11, chandrakant mohikar <crmohikar@gmail.com> wrote:
From: chandrakant mohikar <crmohikar@gmail.com>
Subject: Re: [MW:12198] DSS spools 6" sch 40 x 2mtr.lg.hydro test
To: materials-welding@googlegroups.com
Date: Friday, 12 August, 2011, 8:45 AM
prashant,
the test shall be carried till acceptance and certification without any ambiguities. refer following highlighted line
RECTIFICATION OF DAMAGE/DEFECTS (A) Damage and/or defects detected during pre-cleaning, filling, gauging and pressure test operations shall be located and repaired or replaced by the Contractor in accordance with the pipeline construction specification. The proposed repair and/or replacement procedure shall be verified by the Contractor and approved by the Company when the actual site conditions are known. Following the completion of repairs, the activity which has been interrupted for the repair works should be repeated in accordance with all requirements of standards until the failed activity has been successfully completed. The Contractor shall keep complete records of all damages/defects identified and repairs that are carried out. The records shall include, but not be limited to, the following details: a) exact date/time, location, types and causes of the defects and/or failures b) method of repair used c) equipment, materials and personnel used. These records shall be submitted to the Company as part of the final hydrostatic test report as specified. (A) All defective materials such as pipes, fittings and valves which have failed during the pressure testing and have been replaced, shall be marked/labelled. The mark/label shall clearly state the location, where it came from and the cause of failure. Such material shall be held by the Contractor until the means of disposal has been agreed by the Company and as per reconciliation terms of contract.
Chandrakant Mohikar (ex. CSR- PDO SHELL, VELOSI Oman)
On Thu, Aug 11, 2011 at 12:15 PM, prashant pansare <prashantpan_99@yahoo.co.in> wrote: | Dear All, I' ve inspected DSS spools 6" sch 40 x 2mtr.lg.hydro test at a press. of 230 kg. Test failed two times. Pl. guide me-- How many times I can do the hydro testing of such a spool? If there is no limit, what should be the time interval between two tests? Thanx & Regds, psp | --
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