Vibration Criteria for Compressor Skid, API 618

Vibration Criteria for Compressor Skid, API 618

 

 

 

API 618 5th에서는 왕복동 압축기의 Skid structure에 대한 진동 설계 기준을 아래와 같이 제시하고 있다. 진동 주파수에 따라 진동 변위 (um, 0-Peak) 진동 속도(mm/s, RMS) 단위로 평가한다.

 

7.5.4.14 If specified, a dynamic analysis of the skid, including a modal analysis and forced response analysis shall be performed. The modal analysis shall establish that mechanical natural frequencies of the baseplate are separated from the significant excitation frequencies by at least 20%. The following loads, accounting for magnitude, phase, and frequency shall be considered:   a. forces and moments due to reciprocating and rotating machinery; b. acoustic-pulsation shaking forces in vessels and piping; and, c. forces due to driver torque.   The forced response analysis shall demonstrate that the calculated vibration levels at any particular forcing frequency at any point on the baseplate shall not exceed the following:   a. for a vibration frequency less than or equal to 10 Hz or less, a maximum displacement of 100 μm 0 – peak (4 mil 0 – peak) (0.008 in peak-to-peak) b. for a vibration frequency greater than 10 Hz, a maximum velocity of 4.5 mm/s RMS (0.175 in./s RMS)   If specified, a written report of the analysis shall be provided. Note: This type of analysis is strongly recommended for equipment mounted offshore, platforms or equipment mounted on steel columns. For equipment mounted on solid concrete foundations, dynamic skid analysis may be omitted.

[Skid Vibration Criteria, API 618]

 

 

 

 

[Vibration Criteria for Skid, API 618]