INSULTECH

Case Study 5.4
Engine Exhaust Piping, Expansion Joints & Silencer

Design Specificiaton: HT1100A-MSGM - 2.5" Thickness

Engine Exhaust Application
This case study was performed on a series of reciprocating engine exhausts located in a gas compressor station. Using a sound pressure level meter, and ambient dBA reading of 83 dBA was taken between two engine exhaust pipes located outside the compressor building near the silencers.

Sound Readings
Readings were taken 3 feet away from the piping, expansion joints and silencer of randomly chosen engines, before and after INSULTECH Blanket Insulation had been installed. Using a 2 1/2" thick blanket design with 1 lb loaded Vinyl, performance varied as shown in the table below.

Blanketed dBA Readings Reduce Overall Noise
Although an octave band filter was not available for determining actual frequency concentrations, dBA readings were taken providing a good indication of overall source levels. The general sound level was a low frequency which makes sound reduction more difficult however, the resulting performance is still noteworthy.

Custom Fit to Assembly Drawing
INSULTECH Blanket Insulation was custom fit to existing field conditions. The blankets were fitted onto piping, flanged expansion joints, elbows, engine manifold transitions and engine silencers. Installation was made easy with stainless steel wiretwist fasteners provided on all blanket pieces. All pieces were tagged with an aluminum identification tag which corresponded to an installation assembly drawing. This drawing has been filed and can be used for future reference in the event, blankets must be removed.

Source readings were as follows:

Location Description

Ambient Reading - 20 Linear Feet from Machine

Ambient Level Outside Compressor Building

Exhaust Piping - Outside

Exhaust Expansion Joint - Outside

Exhaust Silencer - Outside