Sentry BPRV - User Manual

Original Instructions
sentry-equip.com
966 Blue Ribbon Circle North, Oconomowoc, WI 53066 U.S.A. | +1-262-567-7256 | support@sentry-equip.com
Installation, Operation &Maintenance Manual
Sentry BPRV Back Pressure Regulator
Pressure Conditioning
S-SW-IOM-00247-3 1-17
Do not install, maintain, or operate this equipment without reading,
understanding, and following the appropriate Sentry Equipment Corp
instructions. Otherwise, injury, damage, or both may result.
Copyright
© 2016 by Sentry Equipment Corp. All rights reserved. All product and company
names are property of their respective owners. This document contains
proprietary information. No part of this document may be photocopied or
reproduced without the prior written consent of Sentry Equipment Corp.
Limit of Liability
Sentry Equipment Corp, its employees, agents, and the authors and contributors
to this document speci cally disclaim all liabilities and warranties, express or
implied (including warranties of merchantability and  tness for a particular
purpose), for the accuracy, currency, completeness, and/or reliability of the
information contained herein and/or for the  tness for any particular use and/or
for the performance of any material and/or equipment selected in whole or part
with the user of/or in reliance upon information contained herein. Selection of
materials and/or equipment is at the sole risk of the user of this publication.
Note
The information contained in this document is subject to change without notice.
Safety Information
Please read the entire manual before attempting to unpack, set up, or operate this
product. Pay careful attention to all Warnings, Cautions, and Notes. Failure to do so
could result in serious personal injury and/or equipment damage.
Use of Hazard Information
If multiple hazards exist, the signal word corresponding to the greatest hazard
shall be used.
De nitions
DANGER indicates a hazardous situation
which, if not avoided, will result in death
or serious injury.
WARNING indicates a hazardous
situation which, if not avoided, could
result in death or serious injury.
CAUTION, used with the safety alert
symbol, indicates a hazardous situation
which, if not avoided, could result in
minor or moderate injury.
NOTICE is used to address practices not
related to personal injury.
 NOTE
Information that requires special emphasis.
 TIP
Alternate techniques or clarifying information.
SHALL:
This word is understood to be mandatory.
SHOULD:
This word is understood to be advisory.
General Safety Precautions
Product Selection, Installation, and Use
Improper selection, installation, or use can cause personal injury or property damage.
It is solely the responsibility of users, through their own analysis and testing, to select
products suitable for their speci c application requirements, ensure they are properly
maintained, and limit their use to their intended purpose.
Follow proper local, state, and federal regulations for proper installation and operational
requirements.
Always use caution and common sense when working with any chemical. Read
the product label and Material Safety Data Sheets (MSDS) carefully and follow the
instructions exactly.
Potential Equipment Hazards
Hot surfaces! This equipment may have very hot surfaces. If an operator contacts a hot
surface, injury may occur. Use protective clothing to prevent injury. If other equipment
comes in contact with a hot surface, damage to the equipment may occur. Ensure the
area around this equipment is kept clear to prevent this damage from occurring.
High pressures! This equipment may contain  uids at very high pressures. Prior to
installing, removing, or maintaining this equipment, ensure that the equipment is
isolated from all connecting piping, the equipment is depressurized, the contents have
been drained, and the equipment is cool.
Standard Warranty
Sentry Equipment Corp (“Seller”) warrants products manufactured by it and
supplied hereunder (“Products”) to be free from defects in workmanship and, to
the extent materials are selected by Seller, to be free from defects in materials, in
each case for a period as de ned in the table below:
Brand Product Line Warranty Period
Sentry®  Steam & Water Sampling Products and Systems
 Solid & Powder Sampling Products and Systems
 Gas Sampling Products and Systems
 Liquid & Slurry Sampling Products and Systems
 Pipeline Integrity Products
Eighteen months from
date of shipment or
twelve months from
startup (whichever
occurs  rst)
Waters
Equipment
Steam & Water Sampling Products and Systems Twelve months from
date of shipment
To view the full warranty, go to
www.sentry-equip.com/warranty.

Summary

Safety Information

Use of Hazard Information

Explains how signal words correspond to the greatest hazard when multiple hazards exist.

Definitions of Hazard Signals

Defines DANGER, WARNING, CAUTION, NOTICE, NOTE, TIP, SHALL, and SHOULD terms.

General Safety Precautions

Product Selection, Installation, and Use

Emphasizes user responsibility for proper selection, installation, maintenance, and use of products.

Potential Equipment Hazards

Hot Surfaces Hazard

Warns about very hot surfaces and the need for protective clothing to prevent injury.

High Pressures Hazard

Alerts to high fluid pressures and requirements for isolation and depressurization.

General Description

BPRV Functionality

Explains the Sentry BPRV's role in maintaining pressure, acting as a relief valve, and its connections.

Installation

Installation Sequence and Connections

Details the sequence for installing the BPRV and specifies its connection types and materials.

Operation

Normal Operating Mode

Describes the expected exhaust flow, pressure control, and fail-safe relief function.

Maintenance

Disassembly and Reassembly Procedures

Provides step-by-step instructions for disassembling and reassembling the BPRV.

Spare Parts

BPRV Diaphragm Replacement Kit

Lists the part number for the BPRV Diaphragm Replacement Kit.

Customer Support

Support Services Overview

Details available customer support services including general information, installation, and technical support.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features
5. Required Materials for Maintenance
6. Disassembly & Reassembly Procedure
7. Spare Parts
8. Safety Precautions

The Sentry BPRV (Back Pressure Regulator/Relief Valve) is a pressure conditioning device designed to maintain a constant pressure at the analyzer inlet, independent of source pressure fluctuations or sample flow changes. It also functions as a relief valve in the event of an over-pressure condition.

Function Description:

When installed in a system, the Sentry BPRV holds a constant pressure of approximately 20 psig (1.4 barg) at the analyzer inlet. If the inlet pressure rises, the regulator opens to allow excess flow to pass through to a drain. This excess flow is typically used as a grab sample. The device's ability to control pressure between 20 psig (1.4 barg) and atmosphere allows for very precise pressure control, minimizes plugging, and ensures reliability. In normal operation, there should always be a flow from the exhaust port. This flow will increase with rising source pressures and decrease with falling source pressures, unless the Sentry VREL® valve is reset to maintain the total line flow at the set point. The BPRV also acts as a fail-safe relief valve, with a relieving capacity that exceeds that of most commonly used 1/4" relief valves. Since the BPRV is continuously in service, any malfunction is immediately evident, unlike a relief valve that can freeze without outward indication until it fails in an emergency.

Important Technical Specifications:

• Controlled Pressure: Approximately 20 psig (1.4 barg) at the analyzer inlet.
• Connections: 1/4" NPT Female.
• Wetted Materials: 316 SS and Viton®.
• Model Number: BPRVa-20.
• Part Number: 7-00868A.
• Serial Number: 16700868A1092 (example).

Usage Features:

• Precise Pressure Control: Designed to maintain a stable pressure at the analyzer inlet, crucial for accurate analysis.
• Reliability: Minimizes plugging and ensures consistent performance due to its precise control capabilities.
• Fail-Safe Relief: Acts as a relief valve to prevent over-pressure conditions, protecting downstream equipment and personnel.
• Continuous Operation: The BPRV is always in service, providing immediate indication of any malfunction.
• Independent Operation: Maintains constant pressure regardless of fluctuations in source pressure or sample flow.
• Grab Sample Capability: Excess flow directed to the drain can be utilized as a grab sample.

Maintenance Features:

Basic maintenance primarily involves cleaning and/or replacement of the diaphragm. The manual provides detailed instructions for disassembly and reassembly.

Required Materials for Maintenance:

• #2 Phillips screwdriver
• #8-32 x 3" screws (qty 3)
• Safety glasses
• Torque wrench

Disassembly & Reassembly Procedure:

1. Remove three of the six #8-32 x 1/2" screws holding the spring housing to the body, ensuring they are 120 degrees apart.
2. Replace these three 1/2"-long screws with three #8-32 x 3" screws, tightening them until their heads bottom out on the body flange.
3. Remove the remaining three 1/2"-long screws.
4. Alternately loosen the 3"-long screws until spring compression is relieved.
5. Clean or replace parts as needed.
6. For re-assembly, reverse the procedure, using the 3"-long screws as jack screws to reapply compression to the spring.
7. Check the tightness of all six screws with a torque wrench, alternating from one side to the other, until all are tightened to 16 in-lb (1.8 Nm).

Spare Parts:

• BPRV Diaphragm Replacement Kit: Part number 6-04084A.

Safety Precautions:

• Spring-Loaded Device: The BPRV is spring-loaded. Do not remove the six screws holding the housing to the valve body without first reading the complete instructions.
• Hot Surfaces: The equipment may have very hot surfaces. Operators should use protective clothing to prevent injury and ensure the area around the equipment is kept clear to prevent damage to other equipment.
• High Pressures: The equipment may contain fluids at very high pressures. Before installing, removing, or maintaining, ensure the equipment is isolated from all connecting piping, depressurized, drained, and cool.
• General Safety: Improper selection, installation, or use can cause personal injury or property damage. Users are responsible for selecting suitable products, proper maintenance, and limiting use to intended purpose. Follow local, state, and federal regulations. Always use caution and common sense when working with chemicals; read product labels and Material Safety Data Sheets (MSDS) carefully.

Sentry BPRV Specifications