Flange Protection System

Flange Protection System Flange Protection System

Preveld Oil & Gas Sdn. Bhd. offers a unique Flange Protection System unlike any conventional methods:

Polyethylene nut cap is designed to protect the exposed bolt and nut portion of the flange connection from the elements that cause corrosion. These caps are designed to fit tight against the nut by "snap-on" ability, therefore protecting from costly repairs or replacements from having to cut stud bolts off. Depending on the operating parameters, we are able to offer a wide range of biodegradable corrosion-inhibitor products to the bolt & nut prior to cover by nut cap, to provide maximum corrosion protection capability even in the most adverse environment!

Flange protector is designed to protect studs and gaskets on raised face and ring type joint flanges from atmospheric corrosion encountered in chemical plants, refineries, gas plants, offshore platforms, onshore oil fields, ships, paper mills and underground pipelines. Our flange protectors made of stainless steel 316L or non-metallic (plastic) to cover the flange section wholly, protecting it from corrosion. Different types of flange injection filler are available depending on each specific application & operating condition, in order to offer maximum protection to the flange.

The products come in various sizes, and they are easy to install, without the need of specialist. Unlike any conventional methods, our unique flange protection system can be temporarily removed then re-installed shall an inspection is required, and it is very durable.

Flange Joint Protection System

The Flange Joint Protection System is used in the protection of flange faces (Raised face or Ring joint type), stud bolts, and gaskets from the elements of corrosion. The Flange Protector covers are available in 316 stainless steel as well as Non-Metallic (plastic). Both materials come with the closed cell rubber liner for sealing protection.

The Flange Protector covers are currently manufactured in sizes for 1/2" to 144" diameter in ANSI, API and AWWA flanged connections. The flange covers systems coupled with the STOPAQ® or E2000/ E2400 flange fillers have been used in the protection of flanged connections for many years with much success in harsh conditions.

Disadvantages Of Conventional Flange Protection Method

Shrink Sleeves

Disadvantages Of Conventional Flange Protection Method - Shrink Sleeves

Shrink sleeve flange shields consist of multiple components (i.e. shrink sleeve, skirting, mastic filler material, masking tape), require numerous tools for installation (i.e. propane tank, torch, hose, regulator, knife, rags, approved solvent, temperature measuring devise, hammer, screwdriver, pliers), along with safety equipment (i.e. fire watch), an extra time and personnel to properly install. Due party to its many installation steps, it is an awkward an complicated method of flange protection. Once installed, flange cannot be inspected for corrosion without removal of the shrink sleeves and the necessity to repeat the entire installation process. In addition, shrink sleeves are very expensive and must be burned or cut off for removal.


Disadvantages Of Conventional Flange Protection Method - Tapes

Shrink sleeve flange tape products must be wrapped completely around the circumference of the flange, though not all flanges can be accessed in this manner. Tape covered flanges are not easily filled and usually result in voids in the flange cavity where condensation formed. Tape products, besides trapping moisture, are non-fillable and not inspectable, making it necessary to cut away and dispose of this non-reusable means of protection.

Wax Fillers

Disadvantages Of Conventional Flange Protection Method - Wax Fillers

Wax and epoxy fillers are both messy and difficult to apply. These fillers require many tools and are extremely time-consuming. Wax must be melted and poured into a form until it hardens. Epoxy must be injected under high pressure, or troweled on the flanges, leaving potential voids. Both wax and epoxy fillers have a tendency to shrink and separate from the flange surface over time, allowing moisture to migrate between the filler and the flange causing hidden corrosion growth. Once installed, wax and epoxy fillers are non-inspectable for corrosion, and messy and difficult to remove and dispose safely.