1. When an object is heated or cooled, its length changes by an amount proportional to the
original length and the change in temperature. Linear thermal expansion of an object
can be expressed as
dl = L0 α (t1 - t0)
Where
dl = change in length m
L0 = initial length m 5.034m
α = linear expansion coefficient m/moC
t0 = initial temperature oC (Standard Temperature)
t1 = final temperature oC (Operating Temperature) 0.833m
Thermal Expansion for one annular plate
L0 - initial length =5 m (while considering the length of annular plate radially outwards)
α - linear expansion coefficient=0.000012 m/moC (API 650 ANNEX P Table: P.1a)
t0 - initial temperature = 13 oC, as per the design data
t1 - final temperature = 45 oC, as per the design data
dl=5.034 x 0.000012x (45-13) = 0.001933056m = 1.93mm
While Considering the breadth of the plate
L0 - initial length =0.833 m (while considering the breadth of annular plate radially
outwards)
α - linear expansion coefficient=0.000012 m/moC
t0 - initial temperature = 13 oC, as per the design data
t1 - final temperature = 45 oC, as per the design data
dl=0.833 x 0.000012x (45-13) = .0003198m = 0.3198 mm

2. While considering the anchor blot slot on the annular plate
L0 - initial length =0.072m (while considering the annular plate anchor blot slot radially
outwards)
α - linear expansion coefficient=0.000012 m/moC
t0 - initial temperature = 13 oC, as per the design data
t1 - final temperature = 45 oC, as per the design data
dl=0.072 x 0.000012x (45-13) = 0.0000276 = 0.0276mm
Reference: http://www.engineeringtoolbox.com/linear-thermal-expansion-d_1379.html
As per drawing
Anchor blot requires 6mm clearance all around
6mm
Site Condition
Physically 2-3mm clearance all around
2-3mm