Structural work comprises of Power House structure , Gallery , Miscellaneous building structures , pipe and cable rack structures etc. It has two parts one is Fabrication and other part is erection. In India structural work ( civil) are executed at site unlike Boiler and other equipment . The approximate tonnage involved in structural work is given below .
- For a project 2x210 MW unit the structural steel required is 13000 MT.
- For a project 2x500 MW unit the structural steel required is 29000 MT.
- For a project 2x660 MW super critical unit structural steel required is 30000 MT.
Fabrication for the above tonnage is also done at site.
STRUCTURAL STEEL.
Some of the standard sections of structural steel are given below for ready reference.
Angles : Designation Size ( lxbxt) weight in kg/M
ISA 50x50x6 50x50x6 4.9
ISA 50x50x5 50x50x5 4.1
ISA 65x65x5 65x65x5 4.9
ISA 65x65x6 65x65x6 5.8
ISA 65x65x8 65x65x8 7.7
ISA 75x75x8 75x75x8 8.9
ISA 100x100x10 100x100x10 14.9
ISA 130x130x10 130x130x10 19.7
ISA 130x130x12 130x130x12 23.4
Beam ISMB 100 100 X50 ( HXB) 8.9
ISMB 125 125 X 70 13.3
ISMB 150 150 X 75 15.0
ISMB 175 175 X 85 19.6
ISMB 200 200 X100 24.2
ISMB 250 250 X125 37.3
ISMB 300 300 X140 46.0
ISMB 400 400 X 140 61.5
ISMB 500 500 X 180 86.9
ISMB 600 600 X 210 123.0
Channel ISMC 75 75 X40 7.14
ISMC 100 100X50 9.56
ISMC 125 125X65 13.10
ISMC 150 150X75 16.80
ISMC 200 200X75 22.30
( these are few section mentioned above generally being used in thermal power structural fabrication.)
Besides standard machine cut plates are also used such as 6mm, 8mm , 10mm,12mm, 16mm ,20mm, 28mm ,32mm ,40mm, 50mm up to 63mm. ETC.
- Fabrication to be done as per fabrication drawing developed from the structural drawing. There are companies available in India who makes the fabrication drawings / detailed drawing. The fabrication drawing includes every detail requires for fabrication.
- Welding of structural items are done by electric arc process as referred in the drawing. For resolving any disputes these documents may please be referred. 1. Drawing . 2. Welding Procedure defined (WPS) .3. Welding Manual . 4. NDE manual .5. Relevant IS codes like 817 , 7215, 12843 ,1852 , 2062 , 9595, 3502, 1239, 3589 etc 6. ASME sec IX 7.
- Submerged arc welding shall be used for welding longitudinal fillet welds.
- Longitudinal / transverse butt joints for fabrication of columns, framing beams and crane girders and
all other built-up members.
- Efforts should be made to position the job such a way so that down hand welding is possible.
-Only qualified welders are to be employed for welding procedures and positions.
- Fillet weld members should be close enough so that gap is 0mm. In no case the gap should be more than 3mm. For example if the fillet gap is found to be 2 mm then fillet size of the joint should be increased by 2 mm.
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dear sir kindly tell which kind of welding process do we use in power plant piping and and what is the position of welding i.e 1G,3G,5G OR 6G and dear sir kindly tell me which kind of NDT inspection is performed in power plant pipe welding.
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