Figuring Lag Sizes

Page 29

Mitres:

Mean Radius ±1.2 O.D X 1/2 π (pi) ÷ Miters

Lags:

O.D. ÷ I.D. X ILS = (OLS)

ID ÷ OD X OLS = (ILS)

Figuring Lag Sizes

Dims Required: ID of Insulation, OD of

Insulation, Inside Lag size or outside lag

size.

Formulas:

OD ÷ ID X ILS = OLS

ID ÷ OD X OLS = ILS

Set up the equation as follows, inside numbers on

top.

Always cross multiply then divide.

Finding the inside lag size

Hold a ruler up the side of the tank, vessel or pipe

to be insulated. (Image on page 54)

Looking down the rules note the measurement

before the deflection on each side of

where the rules touches is to much

(roughly 1/8” gap). This measure is the

ILS.

Tip: Consider the material being used. MF is less

rigid than cal-sil, there fore due to compression of

the material the MF lag size may be wirder (more

delfection when measuring).