9.4
Discharge Connections and Inspection Requirements
The discharge flange connections and related discharge piping and pressure relief valve should be inspected
after each well service job.
1)
Detach both discharge flanges by removing the nuts on each flange. The nuts on a 600 bhp triplex
and 1300 bhp quintuplex are removed using a 1-5/8" wrench; the nuts on a 1000 bhp quintuplex are
removed using a 1-7/16” wrench.
2)
Remove the discharge flange seals from each outlet.
3)
If there is surface rust on the sealing surfaces of the discharge flange or fluid cylinder they must be
cleaned and lightly hand polished with 220-240 grit Emory cloth.
4)
Inspect the discharge flange bores for erosion or corrosion. Contact MSI for wall thickness
recommendations and only replace these with original equipment made by MSI. Failure to use the
properly designed and manufactured discharge flanges can result in injury, death, equipment
damage, and loss of well control.
5)
Inspect the discharge flange studs and nuts for signs of thread damage or stud elongation. Replace if
any defects are found. Only replace these with original equipment supplied by MSI. Failure to use
the proper grade of studs and nuts can result in injury, death, equipment damage, and loss of well
control.
Only use rated "B7" studs per ASTM A193 or "L7" studs per ASTM A320. Use
heavy hex grade 2H nuts per ASTM A194.
6)
Put a light coating of oil or grease on new discharge flange seals and install them into the fluid end.
Next carefully reinstall the discharge flanges taking care to not damage the new seals. Install and
torque the nuts to the value shown in
Section 14
.
7)
Clean and inspect the discharge pressure relief valve per the manufacturer’s recommendations and
replace or repair as needed.
8)
Inspect all discharge manifolds per the manufacturer’s recommendations and replace as needed.
NOTE: If sand, cement, or other solids were used in the last well service job, all manifold lines need to
be cleared, cleaned, and inspected. See MSI Minimum Wall Chart (Dixie Engineering Specification 9-
2014) for inspecting MSI flow control components. Also, clean out the fluid end and inspect all internal
components and replace as needed.
Revision K 03/12/2019
MSI - A Division of Dixie Iron Works, Ltd. All rights reserved.
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