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Job Specification
For
Silencer
DOCUMENT No.
A307-16-46-SP-6519
Rev. A
Page 3 of 5
- ASME Section VIII Div.1.
- ASME Section IX.
- OSHA
- ASME Sec. V
- ASME Sec. II
- ASME B 16.5
- ASME B16.20
- IBR
4.0 TECHNICAL REQUIREMENTS
4.1 The equipment shall be designed, manufactured, tested and supplied in accordance
with the mechanical data sheets, P&IDs, process data sheets, this job specification,
EIL standard specifications, applicable codes, standards and all other attachments of
the material requisition.
4.2 The silencer shall be designed to meet the noise level as specified in the data sheet at
1-meter (perpendicular) distance from silencer discharge.
4.3 The material of construction of various parts shall be as mentioned in the Mechanical
data sheet.
4.4 All internal acoustic insulation shall be constructed with mineral wool / fiber glass in
glass cloth and shall be strengthened with stainless steel wire mesh. The insulation
shall be protected with stainless steel perforated sheet of minimum 1.5mm thickness,
in the path of fluid stream to reduce the noise to the desired noise level. When the
insulation length is more, it shall be supported with circular rings, against sudden
collapsing of the insulation due to its own weight. All internal insulation tubes, if any,
shall be properly supported.
During detailing, Vendor to check the suitability of acoustic Insulation material
for the design temperature specified in data sheets. Incase this material is not
suitable, Vendor to provide the suitable material (without cost and time implication)
and backup documents for material selection to be submitted for EIL review. However
guarantee of the material selection lies with Vendor.
4.5 The silencer venting to atmosphere shall be provided with detachable rain hood and a
bird screen at the outlet.
4.6 The Silencer shall have a drain connection with a 3/4" Gate valve along with a flange
and Blind Flange.
4.7 Unless otherwise specified, silencer shall be designed for vertical mounting with
minimum 2 Nos. support brackets.
Supporting brackets & RF Pad on the silencers to be designed for the piping
loads on the inlet nozzle specified in this specification.
4.8 All butt welds on the silencer shall be full penetration type.
4.9 Diffusers shall be seamless construction or with full radiography of butt welds.
Silencers body as a minimum shall be spot radiographed.
4.10 Unless otherwise mentioned, silencers shall be designed for location outside the
building in the open area.
Format No. EIL 1641-1924 Rev. 1
Page 184 of 291
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