Frequently Asked Questions

Wet and dry barrels are different styles of hydrants for different types of applications. The terms “wet” and “dry” indicate whether or not there’s water left in the barrel of the hydrant when it’s not in use—the part which is … Continued

UL listed fittings for C900 PVC pipe are available. They are ductile iron mechanical joint fittings meeting AWWA C153 and ductile iron flanged fittings meeting AWWA C110. C900 PVC fabricated fittings and C907 molded PVC fittings are not UL list. … Continued

C900 is an AWWA standard, and is separate from UL listings and FM approvals. UL and FM have each issued separate standards for Underground Fire Service PVC distribution pipe. UL standard 1285 lists AWWA C900 pipe in sizes 4 to … Continued

C900 is the AWWA standard for cast-iron-pipe-equivalent outside diameter polyvinyl chloride (PVC) pressure pipe and fabricated fittings for potable water transmission and distribution, covering nominal pipe sizes from 4 inches through 12 inches. The standard covers three classes of pressure … Continued

PN10, PN16, PN25 and PN40 specify both pressure class in bars of pressure, and metric flange dimensions (such as bolt circle diameter, hole size, bolt size etc) according to international flange standards such as ISO 7005-1 or DIN 2501 that … Continued

A monitor hydrant is a specially configured fire hydrant. In addition to standard hose and pumper outlets, it has a special elbow on which can be mounted a fire fighting monitor. Monitors are uses in such places as oil fields, … Continued

MJ stands for Mechanical Joint. It is a type of compression joint designed for underground connection for pipe, valves and fittings. Mechanical joints allow for some deflection of the joint. This accommodates some misalignment of the two elements connected by … Continued

The AWWA C509 design standard was developed based on the physical characteristics of cast iron while AWWA C515 was developed based on the more robust physical characteristics of ductile iron. AWWA C509 standard was developed in 1980 to formalize the … Continued

The difference is in the micro-structure of the iron. Cast iron pipe for water transmission has been around since the 17th century. Cast iron pipe has great strength but lacks malleability so it is subject to mechanical damage in transit … Continued