工廠設(shè)計(jì)噪音安全慣例(1)-資料下載頁
2025-05-07 18:57本頁面
【正文】 cladding or enclosures Fans, blowers 77 1m from casing and openings close cladding or enclosures on casing, silencers for openings Gearboxes 77 1m from casing close cladding or enclosures Steam Turbines 77 1m from casing close cladding or enclosures Fin fan coolers 79 1m below fan, 1m to side of fan ring increased diameter reduced speed fan Cooling Towers (falling water type) 75 79 at grade, 10 m from air inlet at 1m next to fans Fired Heaters, Steam boilers 77 1m from casing and openings close cladding on casing, silencers for openings Solids processing equipment, such as vibrating screens, cyclones, centrifuges, crushers, granulators, pelletizers 77 1m from equipment close cladding or enclosures. Equipment supports may need vibration isolators, and connections may need flexibles, in order to limit vibrationinduced noise in adjacent structure Electric motors see driven equipment 1m from equipment low noise motors may include reducednoise fans, noisereducing fan cowls, increased motor frame size Control valves 76 1m from pipewall at 1m downstream from valve low noise trim, outlet baffle Elevated flares 70 at boundary of sterile area, for normal continuous flaring rate reduced noise flare tip Major Equipment for Restricted Areas The following items can normally expected to have Restricted Areas in their immediate surroundings. SECCO Plant Design Noise Philosophy PH00TSCSE0004A00 Plant Design Noise Philosophy Page 14 of 19 26/06/02 Equipment type typical level (dBA) measurement location Comment Gas turbine prime mover (gas generator) 100 110 inside enclosure enclosure normally restricted access at all times Diesel drive for generator, firewater pump, etc 95105 adjacent to engine carcase For emergency equipment hearing protection to be carried at all times by personnel in the area and worn when engine is running. Minor equipment, and light density layout As a guide, minor equipment can be taken as having rated power of 30kW or less, and light density layout can be taken as where significant noise sources are spaced 10m or more apart, such as pumps for tank farms. In areas where the equipment is 39。minor39。 and the layout is of light density individual equipment noise limits can be set initially at 4dBA below the local area noise limit. Vents to atmosphere Noise from vents shall ply or be patible with the appropriate Normal or Intermittent noise limit. The noise generation may be from either or both of the pressure drop / restriction device (orifice plate or pressure relief valve) or jet noise at the point of discharge to atmosphere. The jet noise ponent may be reduced if necessary by reduction of the efflux velocity. Noise generated at the restriction may be reduced by inline silencers, but the remendations of API 521 shall be taken into account where the vent is part of a pressure relief system. Depending on its routing the pipe run between restriction and discharge may need to be considered for pipework noise. A4 PIPEWORK NOISE CONTINUOUS Noise from pipework frequently dominates a process area. In particular noise from the suction and discharge pipework for large pressors and pumps, and the lines teed into these, can frequently exceed 100dBA at 1m from the pipe if no treatment is applied. The Contractor shall include in his Work Area noise level estimates the effects of pipework noise. As an initial basis the noise reduction at tees should be based on the sound power entering the tee equalling (without power loss) the sum of the sound SECCO Plant Design Noise Philosophy PH00TSCSE0004A00 Plant Design Noise Philosophy Page 15 of 19 26/06/02 powers in the lines leaving the tee, and (for gas lines only) a loss at the rate of 3dB per 50 nominal diameters of pipe run. For large multistage centrifugal pumps and pressors, pipework noise is liable to contain tonal content at blade passing frequency. The application of the Work Area and Community Tonal / Narrow Band weighting requirements shall be addressed by the Contractor. Where large noise reductions are required to be achieved by pipework acoustic insulation the pipework affected shall include in its supports vibration isolation pads (typically neoprene based), to minimise transmission of high frequency noise into the pipework support structure. For further guidance reference should be made to EEMUA 142. Early in the initial design the Contractor should make an initial assessment of pipework insulation requirements before pipework layout design work starts, so that sufficient space is allowed for the application of acoustic insulation and any special pipe supports. A5 ENCLOSURES AND CLADDING Where acoustic enclosures a
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