The following formulas are used to calculate braid coverage and its theoretical burst pressure. Definitions of terms can be found in the Definition of Terms

Variables for Braid Construction

Variables for braid construction shall be according to the following list.

C = Number of carriers
W = Number of wires on each carrier
D = Wire diameter (inches)
A = Braid angle (degrees)
O = Outside diameter of hose (inches) which is equal to inside diameter of braid (inches)
I = Inside diameter of hose (inches)
S = Tensile Strength of wire (Ibs/in2)

Theoretical Tensile Strength and Burst Pressure of Braid

a. Theoretical Tensile Strength of Braid (Ibs):(T)
T = C x W x (D/2)2 x x x S x cos(A)

b. Theoretical Burst Pressure of Braid (lbs/in2):(B)
B=T/E

Where,
E = the cross effective thrust area of the hose (in2)

Assume,
E = the cross-sectional area described by the mean diameter of the hose

Therefore,
E = ((I +O) / 4)2 X Jt

Braid Coverage: (V)

Coverage = V = the percentage of the outside diameter of the hose which is covered by braid Capacity = P = the percentage of the outside diameter of the hose which is covered by braid from only those carriers traveling in the same direction (one half of the total number of carriers).

P = (C x W x D) / (2 x cos(A) x (O + 2 x D) x n:
V=1-(l-P)2

Multiple Braid Hose

It is inappropriate to assume that additional layers of braid will be applied with the same braid angle and/or at the same tension as the first.