Echometer Company
Model – M Manual
Phone: (940) 767-4334
5001 Ditto Lane
Page
26
Fax: (940) 723-7507
Wichita Falls, Texas 76302, U.S.A.
E-Mail:When reassembling the gas gun, always FIRST attach the Housing Cap to the housing with the 4 bolts then
INSTALL the MICROPHONE LAST. Do not over torque bolts.
The four cap bolts, Part No. GG-210, which hold the housing cap to the main gas gun housing should be properly
tightened and periodically replaced. The proper torque for the bolts is approximately 50 inch-pounds. The "O" ring
seal between the housing cap and the housing does not require excessive tightening of the bolts to properly seal. Do
not over tighten bolts. If the bolts are excessively tightened, the bolts would be pre-tensioned to a stress such that
when internal pressure is applied, the additional force on the housing cap generated by the internal pressure could
cause the bolts to fail.
Remote Fire Gas Gun Pressure Rating
The pressure rating of a NEW Remote Fire gas gun is 1500-psi. After the gun has been used, its pressure rating
should be derated by the operator depending on the condition of the gun. The Remote Fire Gas Gun may have
internal and external corrosion, deep external wrench marks, or worn threads. Corrosion causes pitting and
reduction in the strength of the remaining metal. Any corrosion should be examined visually and depending on its
severity the maximum working pressure of the gas gun should be reduced. Marks and notches caused by pipe
wrenches, any type of bending or denting of the metal will cause a reduction in strength. Derate the gas gun for any
noticeable physical damage to the gas gun.
The stainless steel 2-inch line pipe thread on the housing will become worn after unprotected use. For this reason a
knurled microphone protector has been added to the gun to protect the threads on the gas gun. This protector
should be replaced whenever excessive corrosion or wear has occurred.
The Remote Fired Gas Gun cannot be used in the implosion mode. In order to protect the internal parts, the gas
chamber should be charged to a pressure of at least 200-psi or a pressure greater than the well pressure (if known)
before installing the gas gun onto the casing valve. This will insure that debris will not be admitted into the
solenoid/dart valve mechanism. This will greatly reduce the need for maintenance.
Remote Fire Gas Gun Disassembly and Assembly Special Precautions
When disassembling DO NOT REMOVE the MICROPHONE unless results of the troubleshooting tests have
shown that it is not operational.
All internal parts can be accessed from the end where the volume chamber is attached.
Removing the volume chamber will expose the retaining nut that gives access to the gas valve. Remove with a
socket wrench. Use the threaded rod (provided with the repair kit) to pull the gas valve from the housing. Inspect
and replace if needed. Replace the "O" rings as needed.
All other connectors, ports, and the solenoid valve can be serviced without need to remove the volume chamber.