Quite often during our rural water supply operations seminars we encounter pumpers without a high-flow discharge. Most of these pumpers are "older" and of smaller capacity (1,250 gpm or less). One problem that arises when trying to pump LDH is the lack of a high-flow discharge while trying to flow more that 50% capacity of the fire pump. Some times these older pumpers carry 4 or 5-inch LDH...and sometimes, they carry an adaptor right on one of the 2-1/2-inch discharges. In most instances, the LDH coming off that single, 2-1/2-inch discharge probably works just fine...since most fire incidents require flows less than 50% pump capacity.
However, when trying to pump high flows without a high-flow discharge, the pump operator needs to get that LDH on the street and supply it using some type of siamese of manifold using at least two, 2-1/2-inch (3 are preferred) discharg
This 1,250 gpm pumper had no high-flow discharge, so the operator overcame the problem by combining two smaller supply lines into an LDH line.
Not the "perfect" valve...but it worked for this scenario.
It is important to remember that just because it connects, this does not mean it will flow high volumes.
