Читать книгу Pump Wisdom - Robert X. Perez - Страница 23

Pumps can be found mounted in many different ways; there are times and places to do it at least cost and times and places to do it with uncompromisingly high quality.

Plants that use stilt mounting (Figure 3.1) often fall short of achieving best‐possible equipment reliability. Best practices plants secure their pumps more solidly on more traditional foundations. Stilt‐mounted pump sets lack overall stiffness but have been used for small ANSI pumps where the sideways‐move capability of the entire installation was thought to equalize piping‐induced stresses. Among its few advantages is low initial cost.

However, there are serious shortcomings since stilt‐mounting will not allow pump vibration to be transmitted through the baseplate to the foundation and down through the subsoil. Proper foundation‐mounting permits transmission of vibration which can result in a significant increase in mean time between failures (MTBFs), longer life of mechanical seals and bearings, and favorably low total life‐cycle cost [1].