ANALISIS TERJADINYA KAVITASI PADA KATUP BALL DAN GATE BERDASARKAN TINGKAT KEBISINGAN DAN SPEKTRUM GETARAN  

Oleh:

Tamjidillah, Mastiadi

Jenis: Article from Journal - ilmiah nasional
Dalam koleksi: Kalimantan Scientiae: Sain Dan Teknologi vol. 27 no. 74 (Oct. 2009), page 109-118.
Topik: Cavitation; Ball and Gate Valve; Pump; Vibration; Noise; Frequency

Ketersediaan

Perpustakaan PKPM Nomor Panggil: K35 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Cavitation is phenomena of phase transfer from liquid to vapor on moving fluid; this phase transfer can be cause by dropping local pressure or increasing local temperature. Local drop pressure is caused by increasing flow rate on sudden contraction. Cavitation usually happens on valve, elbow and turbo machinery such as pump and turbine. Cavitation indication is bubbles vapor present, noise and vibration on pipe. This experiment has been done to observe of cavitation on ball and gate valve with3/4 in diameters and transparent pipe at downstream side to observe cavitation process. This test will be varied of valve opening 20, 30, 40, 50, 60, 70 and inlet mass flow rate. The cavitation identification is based of vibration spectrum, noise level and visual. Vibration was measured by accelerometer and noise with microhone, both visualized by vibration analyzer. Cavitation was visualized by digital camera. Experiment result shows taht cavitation happen on 20 and 30valve opening, for 40 and 50 valve opening only in incipient cavitation and the other of valve opening 60 and 70 there were on cavitation. By increasing flow rate will also followed by the intensity of cavitation that can be shown by forming of white cover which spread near ball and gate valve discharge and the smallest cavitation number reached to 0.04259. Cavitation intensity are followed by increasing vibration and noise level, it's shown at frequency 10600Hz. The limitation of cavitation for vibration is 0.002 G and noise level is 0.0006 Pa.

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