In my last dispatch the scope of critical piping and LP piping has been covered. Beside
these piping there are piping also covered under different packages ( Boiler ,Turbine ,
ash handling , DM plant ,Fire fighting ,cooling Tower etc). IBR piping is only covered
in Boiler and Turbine . Rest of the package includes LP piping only.
Therefore my discussion on basics will be mostly based on high pressure piping and LP
piping available in Boiler and Turbine.
- The codes we are following in piping is IBR and ASME 31.5.
- Different structural materials like ISMB, ISA ,ISMC ,ISWB etc are used for supports.
Meaning of the same and sizes are available any standard handbook of structures.
- For branching one size lesser of run pipe stub on is preferred . For branching other than
one size of run pipes stub in is preferred. This is as per ASME 31.3.
- Pipe is identified by NB and thickness is defined by schedules whereas tube is identified
as OD.
- However from 14" size pipe NB =OD .
- Soluble Dam is a water soluble material used for restricting the purging gas within the
pipe. This material are extensive used where purging with inert gas is recommended during
welding. This reduces the requirement of Argon gas ( used as purged gas at site)
- In piping two types bolt are used . One is machine bolt ( having one side head and other
side nut ) and other is stud bolt ( having nut in both sides).
- One has to start learning about the isometric drawing of pipe line and mark all the
elevation . Sometimes one side elevation and slope ratio is given other side elevation
to be calculated. this will help during the erection.
- Long radius elbow means 1.5D where D is the diameter of pipe.
- Normally eccentric reducer is used in pump suction and concentric reducer is used in
pump discharge.
- Follow IBR /ASTM code for pipe fittings ,flanges etc.
- Thumb rule for spanner sizing is 1.5 * Diameter of the bolt.
- Thumb rule for current requirement is diameter of electrode * 40 +/- 20.
- Steam tracing are used in HFO ( heavy fuel oil) line to increase pump ability of fluid.
It is placed over the pipe all along the line and connected with different station with
steam traps and valves to discharge condensate time to time.
- Items like control valves , orifice plates , rota meter etc are removed during hydro test ,
mass flushing and replaced by spool pieces of same diameter of pipe. Therefore these
pieces are fabricated before hand.
- We provide dampener in the piping of reciprocating pump to reduce pulsation.
- Use of correct type of reducer in pump suction is absolutely necessary to reduce
cavitation of PUMP. Also knowledge of NP SH ( Net pump suction head ) will give
an idea.
continued for next part
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these piping there are piping also covered under different packages ( Boiler ,Turbine ,
ash handling , DM plant ,Fire fighting ,cooling Tower etc). IBR piping is only covered
in Boiler and Turbine . Rest of the package includes LP piping only.
Therefore my discussion on basics will be mostly based on high pressure piping and LP
piping available in Boiler and Turbine.
- The codes we are following in piping is IBR and ASME 31.5.
- Different structural materials like ISMB, ISA ,ISMC ,ISWB etc are used for supports.
Meaning of the same and sizes are available any standard handbook of structures.
- For branching one size lesser of run pipe stub on is preferred . For branching other than
one size of run pipes stub in is preferred. This is as per ASME 31.3.
- Pipe is identified by NB and thickness is defined by schedules whereas tube is identified
as OD.
- However from 14" size pipe NB =OD .
- Soluble Dam is a water soluble material used for restricting the purging gas within the
pipe. This material are extensive used where purging with inert gas is recommended during
welding. This reduces the requirement of Argon gas ( used as purged gas at site)
- In piping two types bolt are used . One is machine bolt ( having one side head and other
side nut ) and other is stud bolt ( having nut in both sides).
- One has to start learning about the isometric drawing of pipe line and mark all the
elevation . Sometimes one side elevation and slope ratio is given other side elevation
to be calculated. this will help during the erection.
- Long radius elbow means 1.5D where D is the diameter of pipe.
- Normally eccentric reducer is used in pump suction and concentric reducer is used in
pump discharge.
- Follow IBR /ASTM code for pipe fittings ,flanges etc.
- Thumb rule for spanner sizing is 1.5 * Diameter of the bolt.
- Thumb rule for current requirement is diameter of electrode * 40 +/- 20.
- Steam tracing are used in HFO ( heavy fuel oil) line to increase pump ability of fluid.
It is placed over the pipe all along the line and connected with different station with
steam traps and valves to discharge condensate time to time.
- Items like control valves , orifice plates , rota meter etc are removed during hydro test ,
mass flushing and replaced by spool pieces of same diameter of pipe. Therefore these
pieces are fabricated before hand.
- We provide dampener in the piping of reciprocating pump to reduce pulsation.
- Use of correct type of reducer in pump suction is absolutely necessary to reduce
cavitation of PUMP. Also knowledge of NP SH ( Net pump suction head ) will give
an idea.
continued for next part
P.S If you are looking to earn few legitimate extra money from the comfort of your home then please click on the link given below
LINK 1 - PLEASE CLICK HERE
LINK 2 - PLEASE CLICK HERE
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