Roll groove is suitable for steel pipes with standard and light thickness. It has advantage of without removing any pipe material.
Cut groove can keep the integrity of the lining and coating without raised part. It is suitable for steel pipes with big thickness…
To raise efficiency, many factories take the method of cast groove for small size grooved pipe fittings and couplings, normally below 8″ (DN200).
Each closed-head fire sprinkler is held closed by either a heat-sensitive glass bulb or a two-part metal link held together with a fusible alloy.
In fire protection system, the K-factor formula is used to calculate the volumetric flow rate from the fire sprinkler (sprinkler head), water mist nozzle…
Till today, in threaded connection world it is governed by 2 kinds — British Standard Pipe Thread (BSP) and National pipe tapered (NPT).