4 General Technical Specification of Bhilai Steel Plant, SAIL ...

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General Technical Specification
• Location of condensate drain installation
• Water seals and tanks for water seals
• Purging and vent connections
• Manholes
• Instruments
Following norms shall be followed for calculating the condensate load of gas mains:
Sl.
No.
Pipe Dia
(mm)
Height of filling of pipe
cross-section with
condensate (mm)
Gases & Liquid Fluids
Page 24 of 51
Filling in cross –
section (%)
1. Upto 500 Full 100
2. 600 – 1400 500 88 – 35
3. 15oo and above 500 - 800 30 - 14
Condensate drain installation shall be located at approximately every 100 m length of the
pipeline.
Load due to dust deposition shall be as follows:
- 50 Kg per m 2 area on pipelines at a distance within 100 m from blast furnaces.
- 25 Kg per sq metre area on pipelines at a distance between 100 to 500 from
blast furnaces.
Horizontal load along the axis of the pipeline shall comprise the following:
- Load due to thermal expansion
- Load due to internal gas pressure
- Load due to friction (sliding of pipes on supports)
Horizontal load transverse to the axis of the pipelines shall comprise the following:
- Load due to wind pressure
- Load due to component of gas pressure at branch connections
- Load due to component of force arising from thermal expansion or at change of
axis in plan.
For calculating load due to thermal expansion the co-efficient of linear expansion for mild
steel shall be taken as 0.012 mm/deg.c/ m.
Internal gas pressure for coke oven and blast furnace gas shall be taken as 2000
mmWC (g) (Test pressure for the gas pipeline).
Co-efficient of friction for steel to steel shall be taken as follows:
Sliding support : 0.30
Roller support : 0.10
Ball support : 0.10
IS:875 shall be applicable for calculating the wind load on the stockades.
IS:1873 shall be applicable for calculating seismic load.
GS-02