Baker Hughes Flexflo 887 User manual

Flexo™
Model 887 Surge Reliever
Instruction Manual (Rev.C)
Baker Hughes Data Classication : Public

ii | Baker Hughes Copyright 2020 Baker Hughes Company. All rights reserved.
THESE INSTRUCTIONS PROVIDE THE CUSTOMER/OPERATOR WITH IMPORTANT PRO-
JECT-SPECIFIC REFERENCE INFORMATION IN ADDITION TO THE CUSTOMER/OPERATOR’S
NORMAL OPERATION AND MAINTENANCE PROCEDURES. SINCE OPERATION AND MAINTE-
NANCE PHILOSOPHIES VARY, BAKER HUGHES COMPANY (AND ITS SUBSIDIARIES AND AF-
FILIATES) DOES NOT ATTEMPT TO DICTATE SPECIFIC PROCEDURES, BUT TO PROVIDE BA-
SIC LIMITATIONS AND REQUIREMENTS CREATED BY THE TYPE OF EQUIPMENT PROVIDED.
THESE INSTRUCTIONS ASSUME THAT OPERATORS ALREADY HAVE A GENERAL UNDER-
STANDING OF THE REQUIREMENTS FOR SAFE OPERATION OF MECHANICAL AND ELEC-
TRICAL EQUIPMENT IN POTENTIALLY HAZARDOUS ENVIRONMENTS. THEREFORE, THESE
INSTRUCTIONS SHOULD BE INTERPRETED AND APPLIED IN CONJUNCTION WITH THE
SAFETY RULES AND REGULATIONS APPLICABLE AT THE SITE AND THE PARTICULAR RE-
QUIREMENTS FOR OPERATION OF OTHER EQUIPMENT AT THE SITE.
THESE INSTRUCTIONS DO NOT PURPORT TO COVER ALL DETAILS OR VARIATIONS IN
EQUIPMENT NOR TO PROVIDE FOR EVERY POSSIBLE CONTINGENCY TO BE MET IN CON-
NECTION WITH INSTALLATION, OPERATION OR MAINTENANCE. SHOULD FURTHER INFOR-
MATION BE DESIRED OR SHOULD PARTICULAR PROBLEMS ARISE WHICH ARE NOT COV-
ERED SUFFICIENTLY FOR THE CUSTOMER/OPERATOR’S PURPOSES THE MATTER SHOULD
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OPERATOR ARE STRICTLY LIMITED TO THOSE EXPRESSLY PROVIDED IN THE CONTRACT
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SIST IN THE INSTALLATION, TESTING, OPERATION, AND/OR MAINTENANCE OF THE EQUIP-
MENT DESCRIBED. THIS DOCUMENT SHALL NOT BE REPRODUCED IN WHOLE OR IN PART
WITHOUT THE WRITTEN APPROVAL OF BAKER HUGHES.

Flexo 887 Series Surge Reliever Manual | 1
Copyright 2020 Baker Hughes Company. All rights reserved.
Scope
This manual provides instructions for installing, operating,
maitianing and determining the Jacket Pressure Set Point
(JPSP) for all sizes of Flexflo surge relievers.
Product Description
The Flexflo Surge Reliever consists of a slotted metal Core over
which a flexible rubber tube is installed. Tubes each have a
maximum allowable differential pressure rating, based on ASME
Class ratings, and they are molded in a number of different rubber
compounds to meet different applications. The Core has two sets
of openings or slots arranged around the outer circumference of
the Core. The inlet slots are separated from the outlet slots by a
metal barrier. The volume enclosed by the Body sleeve and the
outside surface of the Liner is a pressure chamber known as the
Jacket space. A ported metal Liner is located around the Tube
and prevents over expansion of the Tube. The volume between
the tube and the Liner is known as the Annular volume. The
Jacket and the Annular volume are connected by the ports in the
Liner, and together make up the Total Volume, which is charged
with compressed, dry gas (not with liquid).
Principles of Operation
(Refer to Figure 1 to identify parts).
When the inlet pipeline pressure (upstream of the Surge
Reliever) plus the added pressure required to over come
the Tube material’s natural resistance to expand (the Tube’s
Minimum Differential pressure or DF Minimum) exceeds the
Jacket Pressure Set Point of the Flexflo Surge Reliever, the
Flexflo will start to open and start to relieve the line pressure
upstream of the Flexflo Surge Reliever.
Table Of Contents
Product Description ..................................................................................................................1
Surge Reliever Markings...........................................................................................................1
Principles of Operation .............................................................................................................1
Installation ..................................................................................................................................2
Set Jacket Pressure Set Point ..................................................................................................4
Tube Differential Pressure ........................................................................................................5
Field Assembly and Disassembly ............................................................................................6
Product Support ........................................................................................................................10
Field Disassembly and Reassembly Tables ............................................................................11
Flow
Liner
Tube
Annular
Volume
Jacket Volume
Short Length
is Down-
stream End
Body Sleeve
Jacket at Loading Port
Surge Reliever Markings
Figure 1 - Partial Cutaway of Flexflo Surge Reliever
When the pressure at the inlet of the exceeds the Jacket
Pressure Set Point pressure by the Tube’s DF Minimum
pressure, the valve will start to open. Fluid at the inlet will be
directed up through the upstream slots in the Core, between
the inner surface of the Tube and around the outside surface
of the Core’s Barrier, down into the downstream slots into the
downstream surge line. Minor surges may be absorbed by just
the action of the Tube expanding slightly relieving line pressure
without releasing fluid from the upstream pipeline. Reaction time
for the Surge Reliever is very rapid, in the range of milliseconds.
The additional volume of compressible gas in the Jacket space
allows rapid expansion of the Tube.
Note: Temperature variations will cause the Jacket pressure
to vary. See temperature changes Page 2.

2 | Baker Hughes Copyright 2020 Baker Hughes Company. All rights reserved.
Installation
1) The Flexflo Surge Reliever may be installed in either a
vertical or horizontal line. Flow must be in the direction of
the flow arrows.
2) The pressure source for charging the Jacket and Annular
volume must be dry nitrogen, natural gas, or compressed air
at a pressure higher than the desired pressure in the Jacket
Space (the Jacket Pressure Set Point).
DO NOT USE OXYGEN or liquids to pressurize the
Flexo’s Jacket Space.
3) All connections for the Jacket supply gas must have no
leaks.
4) The range of the Jacket Pressure gauge should be
approximately twice the desired Set Point Pressure.
5) Allow sufficient space for accessing and servicing the Flexflo
Surge Reliever with lifting equipment.
Methods to adjust and hold pressure in the jacket
A. Bottle assembly (See Figure 2). The bottle assembly
provides a convenient method to hold pressure in the jacket
See adjusting pressure with a bottle assembly on page 3.
Figure 2
B. See figure 3. With a pressure source at a higher pressure a
pressure regulator can regulate pressure to the jacket. See
instruction W-887-15LH-B00-1 if this method is chosen.
Figure 3
Temperature changes
Temperature changes in the jacket will change the pressure
when the surge reliever will open. This is important to consider
because the surge reliever could open at a higher pressure than
desired. A few things should be considered for the day to night
and week to week changes in temperature around the surge
reliever.
Ways to deal with temperature changes:
1. Chosen Jacket pressure could be low enough that even with
temperature and pressure changes the surge reliever will
open when needed.
2. A method could be provided by the customer to keep the
temperature around the surge relieve constant.
3. Bottle assembly can be buried in the ground.
4. Shade the surge reliever and bottle assembly.
5. Method B with a hard adjustable regulator could be used.
The pressure regulator can remove excess pressure or add
pressure as needed to the jacket however it also will change
pressure over time so adjustments will be needed. See
instruction W-887-15LH-B00-1 if this method is chosen.
Adjusting pressure with a bottle assembly Installation:
1. Bottles assemblies are coated to allow them to be buried in
the ground with only the top of the bottle(s) exposed. The
purpose of embedding the bottles in the ground is to support
the bottles and to stabilize the temperature of the bottles. If
the Bottles are not buried, the Bottle Assembly should be
secured properly and protected from damage to the bottle(s)
or the pressurized lines.
2. The 1/2” MNPT end, the end with the O-ring, of the Jacket
Connector Assembly, see Figure 4, will be threaded into the
1/2” FNPT Jacket Port of the surge reliever.
a. Clean and inspect the mating surfaces, the O-ring,
and O-ring sealing surfaces for any damage, debris,
or packing material that may interfere with proper
installation or with a pressure tight seal.
b. Thread the 1/2” MNPT end of the Jacket Connector
Assembly into the Jacket Port until it just bottoms out.
Do not tighten. Position the three 5/32 hex head valves
(labeled Supply, Vent, and Cylinder) so they can easily
be adjusted, but will not collect water; and position the
pressure gauge (if equipped) so that it can be easily
read and will not collect water. Tighten the 1-1/4” Lock
Nut with a 1 1/4” wrench against the body of the surge
reliever while holding the body of the Jacket Connector
Assembly. Maintain the proper position of the gauge
and valves.
3. A separate pressure supply source will be required to charge
the Jacket chamber/recharge the Bottle Assembly. When
not in use, insert a 1/4” MNPT pipe plug into the Charging
Supply Connection. The Pipe plug is recommended but not
required.
4. Install the tubing from the Cylinder Connection to the open
tube fitting of the Bottle Assembly. Secure the tubing so that
it is protected from damage and vibration.
5. Visually inspect the system for any open ports, loose
connections, or damaged tubing. Plug or tighten any open
ports or loose connections. Replace any damaged tubing.
6. Loosen the supply and cylinder lock nuts and back out the
threaded nut collars approximately 1 turn.

Flexo 887 Series Surge Reliever Manual | 3
Copyright 2020 Baker Hughes Company. All rights reserved.
Pressurize/Charge the 888 Bottles:
1. Using an external pressure source to charge/recharge the
Bottle system.
a. Remove plug if needed from Charging supply
connection. Connect an external pressure source with
either very dry air or Nitrogen Gas to the Charging
Supply connection.
b. Open the valve to the external pressure source.
c. Slowly open the Cylinder Valve and the Supply Valve to
pressurize the Bottles and the Jacket Space.
d. Allow the Pilot Bottle system and the Jacket to charge
up to the desired set point pressure, if no leaks in the
system are detected. Close only the Supply Valve
once the desired Jacket pressure and the Bottles are
pressurized to the desired set point.
e. Snug the two threaded Collars and tighten the two Lock
Nuts to 8 ft-lbs (10.8 Nm).
Cylinder
Connector
Charging Supply
Connector
Figure 4 - Jacket Assembly
Flexflo Surge Reliever Adjustment Procedure:
Gauges must be rated for higher than the maximum pressures
required at both the Inlet and the Jacket Loading ports of the
Flexflo Surge Reliever.
1. Increase the pressure in the Jacket Loading port to a
pressure slightly (approximately 50 psig or 3.45 barg) above
the desired Relief Set Point pressure (the Line pressure
where the Flexflo Surge Reliever will start to open and relieve
the upstream pipeline pressure). If necessary increase the
Line pressure at the same time as the Jacket pressure.
Do not exceed the maximum rated differential pres-
sure of the Tube at any time. Refer to the nameplate
for the maximum differential pressure rating for the
Flexlo tube.
2. Gradually apply and maintain the desired Line pressure to
the inlet of the Flexflo Surge Reliever.
3. From the Tube Differential Pressure Table obtain:
a. the full open differential pressure DF Maximum for the
size and tube material in use at the applications coldest
temperature.
b. The differential pressure where the Flexflo Surge
Reliever tube begins to flow DF Minimum for the size
and tube material in use at the applications coldest
temperature.
Note: The Tube Differential Pressure Table informationshows
average values and variations of+/- 5% can be expected.