[MW:584] RE: 581] Regarding PWHT and Sand Blasting advice me

Generally it depends on humidity.

Blasting can be  carried out after 10.00am and generally till 17.00 hrs in the evening when the steel temp. and humidity is conducive.

regards

 

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Jivan Dhamane
Sent: Tuesday, February 19, 2008 5:58 PM
To: materials-welding@googlegroups.com
Subject: [MW:581] Regarding PWHT and Sand Blasting advice me

 

Dear Friends

 

I have two queries that are as follows please advice me.

 

1.      We are constructing Horton Sphere, at the initial stage our subcontractor had submitted PWHT procedure for whole sphere, but due to some accessories to inserted in the sphere for PWHT purpose they revised PWHT procedure in two parts. That is by Internal Firing Method for whole sphere except (Bottom Centre Crown plate weld) and after welding of Bottom Centre Crown plate weld PWHT is to carry out by Local Electrical Heating Method.

 

By doing so, BVIS Surveyor is asking for 02 Nos. Production Test Coupons (PTC). One for PWHT by Internal Firing Method and another for PWHT by Local Electrical Heating Method. We tried to convince BVIS Surveyor for only one no. PTC as Welding Procedure Specification (WPS), PWHT cycle and other all construction activities are same for both the part but BVIS Surveyor is no satisfied and asking for 02 Nos. PTC.

 

2.      As per painting specifications codes and standard paining shall not carried out when the humidity is above 85%. What time sand/slag blasting shall start in the morning (as water due is present in atmosphere or the surface) and up to what time it shall continue in the evening? As you know India environmental condition and our site is near seashore.

 

Waiting for your reply, till then take care and good bye

 

Regards

 

 

Jivan Dhamane

  

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