do i just pop it out and change the unit? the two smoke detectors in my house are old, so they don't have the plug thing, so do i just go straight switching the wires in the pigtail, and don't have to worry about being electrocuted?thanks a bunch
No you don't have tetanus/lockjaw. You are probably vaccinated for it anyway.
There is no standard k factor for the flow from hydrants. The desigh of the hydrant affects the flow rate. The construction of the hydrant but is a key factor, particularly the entrance rom the barrel to the butt. There are three different constructions. one has a rounded entrance, another entrance is square, and the last extends into the barrel. Flow is determined from charts showing theoretical flow (by butt size) and pitot pressures determined during flow. These estimates are modified by coefficients determined by the type of butt construction. Now you are ready to read the link.
