Pressure Relief Valve Installation and Usage

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Introduction

Our new generation of watertight enclosures feature a locking cord that secures the end caps to the tube and prevents them from coming off accidentally. However, this extra security also means that if an excessive amount of pressure builds up inside a tube it can create an unsafe situation. The Pressure Relief Valve (PRV) was designed to automatically release any internal pressure that may build in a watertight enclosure safely if it reaches 12 ± 3 psi.

This guide will show you how to install the PRV on your watertight enclosure and use its related accessories.

Safety

To ensure safe operation, the PRV should be installed on all watertight enclosures that feature locking end caps.

Do not clean or rinse the PRV with pressurized water or air as this may push foriegn material under the plunger O-ring, compromising the seal.

Do not disassemble or tamper with the PRV valve mechanism.

Parts of the Pressure Relief Valve

You Will Need

The M10 size Bulkhead Wrench is used to install the PRV.

Installation

The PRV comes fully assembled, it only requires installation on your watertight enclosure.

1. Lubricate the provided bulkhead O-ring with a thin layer of silicone grease and install it in the groove on the underside of the bulkhead.

2. Using the provided M10 nut, secure the bulkhead to an appropriate hole in the watertight enclosure end cap. Tighten to finger tight, then use the Bulkhead Wrench to tighten an additional ~1/16 of a turn. If you can&#;t loosen the bulkhead with your fingers, it is tight enough. If using a torque wrench, tighten to 3.5 Nm.

If installing in a threaded end cap hole, the M10 bulkhead nut is not required.

The Bulkhead Wrench can be used to tighten either the bulkhead or the nut. If using it on the bulkhead, remove the PRV plug first.

Usage

The PRV will automatically release internal pressure that builds up inside a locking enclosure when it reaches 12 ± 3 psi, but for the majority of the time it will be used just like the regular vent.

1. Unscrew the PRV plug from the bulkhead to manually vent pressure when opening and closing the watertight enclosure.

2. Insert the plug into the bulkhead and tighten to seal the PRV.

Using the Vacuum Plug

The PRV uses the same bulkhead as the regular vent. This means that the same Vacuum Plug can be used to perform vacuum tests on the enclosure.

1. Unscrew the PRV plug from the bulkhead and set it aside.

2. Insert the Vacuum Plug into the bulkhead to perform a vacuum test.

Please refer to our Using the Vacuum Plug and Hand Pump guide for full instructions.

Using the Vacuum Plug and Hand Pump

Ensure the O-ring seals are good on our WTE with this quick test!

Using the Backfill Adapter

The PRV Backfill Adapter is an accessory for the PRV that allows you to backfill a watertight enclosure with an inert gas or seal it while maintaining a vacuum. This section will show you how to use it with the PRV.

To Use the Backfill Adapter You Will Need

1. Lubricate the O-ring included with the Backfill Adapter with a thin layer of silicone grease and install it onto the Backfill Adapter.

2. The PRV plunger has threads at the top to accept the threads on the Backfill adapter. Screw on the adapter clockwise into the PRV. The O-ring on the Backfill adapter will seat into the PRV plug.

3. As you screw on the Backfill Adapter the plunger is pulled up, creating a sealed path into the enclosure. Continue turning the Backfill Adapter into the PRV plug all the way until it stops and cannot be turned further.

4. Insert the Vacuum Plug into the Backfill Adapter. At this point the Vacuum Plug and the Backfill Adapter can be used with a backfilling system to backfill the enclosure with an inert gas such as nitrogen or to pull a vacuum inside the enclosure.

5. After backfilling or pulling vacuum is complete, unscrew the Backfill Adapter counter-clockwise to remove it. As the Backfill Adapter is unscrewed the plunger is released and reseals the PRV.

The Backfill Adapter should not be used to pressurize the watertight enclosures.

Maintenance

• The PRV valve mechanism does not require any maintenance. Each PRV is assembled and tested at our factory to ensure it releases at the correct pressure. We recommend that you do not disassemble or tamper with the valve mechanism to ensure proper functionality.
• Do not clean or rinse the PRV with pressurized water or air as this may push foriegn material under the plunger O-ring.
• If the PRV Plug feels difficult to turn, lubricate the O-rings with silicone grease as needed.

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Location of Pressure Relief Valve in ASME VIII-1 Vessel

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Location of Pressure Relief Valve in ASME VIII-1 Vessel

Location of Pressure Relief Valve in ASME VIII-1 Vessel

IdanPV

(Mechanical)

(OP)

3 May 21 09:23

Hello All,

I would like to know if there are any special requirements regarding the location of the pressure relief valve which is to be installed in a ASME VIII-1 vessel.
This is a rectangular vessel which designed to contain steam, due to design considerations, I would like to install the relief valve on one of the vessel walls (left side or right side) and not on the top of the vessel.
Is there any requirement in the Code which prevent me to do so?

Thank you all

RE: Location of Pressure Relief Valve in ASME VIII-1 Vessel

The Obturator

(Mechanical)

3 May 21 09:53

ASME VIII () UG-135 provides guidance on this including cautions on any vessel liquid level relative to the PRV. For a more comprehensive guide I suggest you also consult the relative content in API-Standard-520 Part II ().

What is important, is that the PRV is installed in a vertical position (spindle above disc). Non-mandatory Appendix M Section M-11 reinforces that in ASME VIII though exceptions are allowed.


*** Per ISO-, the generic term 'Safety Valve' is used regardless of application or design ***

*** 'Pressure-relief Valve' is the equivalent ASME/API term ***

RE: Location of Pressure Relief Valve in ASME VIII-1 Vessel

IdanPV

(Mechanical)

(OP)

3 May 21 14:18

Thank you for your comment

RE: Location of Pressure Relief Valve in ASME VIII-1 Vessel

don

(Chemical)

5 May 21 01:21

Installation location constraints exist, and they're based on the relief fluid phase. ASME VIII (and other codes/standards) say that a PSV which is designed to relieve vapor must be mounted on a nozzle in the vapor section of the vessel. The reason for that is obvious when you think about it. Say you have a PSV orifice that's sized to relieve one cubic meter of gas per second at the relieving pressure. And someone mistakenly mounts that PSV on a nozzle in the liquid section of the vessel. Now, because of this error, the PSV has to relieve a cubic meter of liquid per second. Obviously, that's not going to happen.

Regarding the orientation of the installed PSV, it has to be consistent with what the manufacturer has tested and approved. Obviously, the vertical upward orientation is approved by all manufacturers for all PSVs. If a horizontal orientation is needed for whatever reason, say for example because of limited physical space, then you'll need to choose a PSV that is approved (by the manufacturer) for horizontal installation. Leser has the greatest number of PSVs that permits horizontal installation - the majority of their PSVs can be installed horizontally, but check the catalog to verify that you haven't selected one that's not approved for that.

RE: Location of Pressure Relief Valve in ASME VIII-1 Vessel

KevinNZ

(Mechanical)

6 May 21 03:25

Don

Good points about discharge from the below the liquid level. I have had to explain this to a number of clients who were expecting burst disks to be installed at a steam pipeline a low point rather the high point near the source.

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