Re: [MW:10933] Hydrotest-API 650

Gents,

 

Pad plate for pipe support has been welded with tank shell before hydrotest.

After hydrotest we have done fitup of pipe support on the pad plate which was already welded with shell.

To avoid distortion during the welding 2 stiffner support provided both sides of the pipe support and welded less than 1'' tack weld  with the low hydrogen electrode|(E-7018).

 

Please see the attached figure for your referrence.

 

2011/5/2 Jorge Mejía Lema <jmejialema@gmail.com>

Please read the following para gphs API 650 , Eleven Edition:

7.2.1.11

Non-structural small attachments such as insulation clips, studs and pins but not insulation support rings or bars may

be welded by the arc stud, capacitor discharge or shielded metal arc process to the exterior of the shell including reinforcing plates

or PWHT assemblies and roof either before or after hydrostatic testing is performed, but before the tank will be filled with product

provided:

a. The attachment locations meet the spacing requirements of 5.8.1.2a.

b. The arc stud welding process is limited to 10 mm (

3/8 in.) maximum diameter studs or equivalent cross-section.

c. The maximum shielded metal arc electrode is limited to 3 mm (

1/8 in.) diameter and shall be a low-hydrogen type.

d. The attachment welds, except for those made by the capacitor discharge method, shall be inspected per 7.2.3.5. The attachment

welds made by the capacitor discharge method shall be visually examined for all types and groups of shell materials.

e. All stud welding and capacitor discharge procedures have been qualified in accordance with ASME Section IX. Capacitor discharge

procedures do not require procedure qualification provided the power output is 125 watt-sec or less.

The shielded metal arc weld procedures shall meet the requirements of Section 9 for qualification for use.

7.3.6 Hydrostatic Testing Requirements

7.3.6.1

This hydrostatic test of the tank shall be conducted before permanent external piping is connected to the tank. Attachments

to the shell defined in 5.8.1.1, located at least 1 m (3 ft) above the water level, and roof appurtenances may be welded during the filling

of the tank. After completion of the hydro-test, only non-structural small attachments may be welded to the tank in accordance

with 7.2.1.11. Any welded joints above the test-water level shall be examined for leakage by one of the following methods:

Regards,

Jorge Mejía, Colombia, South America

2011/5/1 <rosli@labuanship.com>

Dhana,

You need to redo the HT if the welding of temporary support attached to pressure part, refer to your tank construction code. Thanks

Regards
RM

Sent by Maxis from my BlackBerry® smartphone

---

From: SOHAIB GHNAIMAT <sohaib_cegco@yahoo.com>

Sender: materials-welding@googlegroups.com

Date: Sun, 1 May 2011 10:16:21 -0700 (PDT)

To: <materials-welding@googlegroups.com>

ReplyTo: materials-welding@googlegroups.com

Subject: Re: [MW:10909] Hydrotest-API 650

Re-Hydro test should be done.

 

Regards,

 

Sohaib

---

From: DHANASEKARAN SUBRAMANIAM <subramaniamdhanasekaran7@gmail.com>
To: materials-welding@googlegroups.com
Sent: Sun, May 1, 2011 8:40:39 AM
Subject: [MW:10902] Hydrotest-API 650

Gents,

After the completion of a tank hydro test, some temporary attachment welding has been made on the shell and roof plates.

What action needs to be taken at this stage, kindly provide the action plan with code references.

 

 

Your Immediate response is highly appreciated.

 

 

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WITH REGARDS,
DHANASEKARAN .S ,

Mob.no: +96893220429.

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WITH REGARDS,
DHANASEKARAN .S ,

Mob.no: +96893220429.

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