Small animals tend to live shorter lives than larger animals. There are a few theories as to why that is, but the one I believe is most popular is: small animals tend to live shorter lives anyway (because of threats from predators), so there are fewer opportunities to evolve to be long-lived.
The American National Standards Institute (ANSI) Class 150 is a system of dimensional standards for weld neck, threaded, slip-on, lap joint, socket weld and blind flanges. Dimensions for facing, bolts and studs are also included in ANSI Class 150. ANSI Class 150 establishes measures for pipe sizes.
Shop for Hole saws. An Essex flange is used to add extra connections to a hot water cylinder (for example: a power shower connection). Note: a piece of wire is always supplied with an Essex flange, and it is essential you have it for the installation process.tep 11 - Insert Essex flange. Insert the Essex flange into your newly-cut hole (lug end first). Once the Essex flange is inside the cylinder, do not let go of the wire.