It is service requirement,what we have to do in this case.
--- On Thu, 14/10/10, Karthik <
karthik6684@yahoo.com> wrote:
> From: Karthik <
karthik6684@yahoo.com>
> Subject: Re: [MW:7548] pwht requirement for service
> To:
materials-welding@googlegroups.com> Date: Thursday, 14 October, 2010, 11:13 AM
> Hi,
> Please refer UCS 56(f).
> If your case is not fall in service requirements you
> can do clit welding with minimum preheat of 95 degree
> celcius and the thoat thickness must not exceed 13mm.
>
> Alsot in section-1 there is a provision for fillet
> welding of non pressure part to pressure part welding after
> hydo test.(PW54.3)
> PW-54.3 Welding of nonpressure parts to pressure
> parts and seal welding of pressure
> retaining handhole and
> inspection plugs or fittings secured by
> physical means may
> be performed after the hydrostatic test
> without requiring
> another hydrostatic test provided the
> following criteria
> are met.
> PW-54.3.1 Welding is done in conformance with
> this Part and the completed weld is
> inspected by the Authorized
> Inspector. The Manufacturers' Data Report
> Form shall
> be signed only after completion of the
> welding.
> PW-54.3.2 For nonpressure parts welded to pressure
> parts, the following additional conditions
> shall be met:
> (a) The pressure part material is limited to P-No. 1
> materials.
> 111
> (b) The nonpressure attachment material is limited to
> carbon steel with a carbon content not
> exceeding 0.2% or
> any P-No. 1 material.
> (c) The welding is done by stud welding or by fillet
> welding having a throat not exceeding the
> lesser of 0.70
> times the thickness of the pressure part or
> 1⁄4
> in. (6
> mm).
> (d) A minimum 200°F (95°C) preheat shall be applied
> when the pressure part thickness exceeds
> 3⁄4
> in. (19 mm).
>
> Thanks & Regards,
>
> (Karthik)
> Karthikeyan.S
> QA/QC
> Manager
> Getabec Energy
> Co.,Ltd.
> 379,Moo6,Soi8,Nikhomphatana,
> Rayong-21180,
> Thailand.
> Phone: 0066 38 897035-8
> (Off)
> Fax: 0066 38
> 897034
> Hand Phone: 0066
> 892512282
>
> --- On Thu, 10/14/10,
sunilrathoreps@yahoo.com> <
sunilrathoreps@yahoo.com> wrote:
>
>
> From:
sunilrathoreps@yahoo.com> <
sunilrathoreps@yahoo.com>
> Subject: [MW:7541] pwht requirement for service
> To: "
materials-welding@googlegroups.com"
> <
materials-welding@googlegroups.com>
> Date: Thursday, October 14, 2010, 2:24 AM
>
>
> Dear members
>
> We i have installed new desalter in our plant in which
> cement lining is not given in the drawing ,but the existin
> desalter have cement lining ,the thk of vessel is 34 mm and
> pwht is given in the drawing ,we want to do cement
> lining in side the vessel to do this we need to weld the
> clit with vessel to hold the wire mesh.
>
> It is mentioned in the drawing that no weld after pwht.
>
> In this case what we have to do?
>
> Is this pwht is service requirement or code requirement
> ,but as i know that as per sec VIII 38 mm thk is the pwht
> requirement.
>
> if its service requirement pwht then what does the code
> mentioned about the pwht ,weather we go for weld clit
> without pwht or pwht ,
>
> What is alternative rule to avoid pwht.
>
> Plz reply as soon as possible.
>
> Regards
>
> Sunil rathore
>
>
>
>
> -
>
> From: vasu k <mailto:
vasuk2577@gmail.com>
>
>
> To:
materials-welding@googlegroups.com>
>
> Sent: Tuesday, October 12, 2010 1:18 AM
>
> Subject: [MW:7486] reg baking
>
>
>
> Dear All,
>
> Iam new to piping. I have some basic
> doubts and i request you to
> please clarify..
>
> 1. In our fab yard, in the evening after
> the work is finished,
> the remaining electrodes(E-7018 and E-7018-1) are being
> kept back in the
> oven and the entire night the oven will be at 150 deg.
> Will
> it affect the coating if they r kept for that much time
> (the entire night)?
>
> No
>
>
> 2. Do i have to do baking for those
> electrodes again in the
> morning?
>
>
>
> Not Required
>
>
> 3. What is the max number of recycling
> of electrodes?
>
>
>
> Re-Baking maximum of only once
>
> 4. what is the purpose of doing baking
> till 250 deg ?
>
>
>
> Removal of Adsorbed moiture
>
>
>
> doesnt the moisture will be removed if
> we maintain 150 deg i.e
> continuously at holding temp?
>
> Mfg has to advise
>
>
> Regards,
>
>
> vasu.
>
>
>
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