Curing And Dryout Of Refractories

Boiler Refractory Dryout

Boiler Refractory Dryout Courtesy of Rentech Boiler Systems Refractory Dry Out Procedure The refractory material was not normally thermally cured at the factory It is not uncommon for moisture to be absorbed by the refractory during final stages of in shop fabrication transit to the job site and before the upstream combustion products are first passed through the unit

BODY OF KNOWLEDGE FOR API 936 REFRACTORY

3 Knowledge of dryout requirements 4 Sealing requirements for example water mist covering membrane curing 5 Application and time limits for applying membrane curing compounds 6 Environmental conditions required for curing 7 Heatingequipment methods and procedures e g gas fired burner stress relievingheating elements 8

Drying Refractory in Steam Generating BoilersInsulation

Dry out must not be confused with curing which is the process of keeping the refractory material wet or the surrounding atmosphere humid for 24 hours prior to applying heat for drying This curing process is required on all cement bonded refractory to create the most favorable conditions to complete the chemical reactions of the cement and water

Points to Remember When Using Castablessparref

the temperature at that level until all steam dissipates Heat will remove the free water as steam at around 212oF while the water of hydration will be driven off between 400oF and 1600oF Hold temperatures at 400oF to 450oF and again at 1000oF to 1100oF for as many hours as inches thick of the cast piece AVOID DIRECT FLAME IMPINGEMENT ON REFRACTORY

BODY OF KNOWLEDGE FOR API 936 REFRACTORY

3 Knowledge of dryout requirements 4 Sealing requirements for example water mist covering membrane curing 5 Application and time limits for applying membrane curing compounds 6 Environmental conditions required for curing 7 Heatingequipment methods and procedures e g gas fired burner stress relievingheating elements 8

HARBISON WALKER Handbook of Refractory Practice 2005

American Refractories Company NARCO and Harbison Walker at the time naming the resulting organi zation RHI Refractories America Today the U S and export operations have been reorganized and operate independently under the name ANH Refractories Because of the strong reputations that Harbison Walker and NARCO established over their

ANH Refractories Company Mixing Using Instructions

ANH Refractories Company Mixing Using Instructions A P Green Harbison Walker NARCO and Global Gix Canada are part of the ANH Refractories family of companies Page 2 of 2 KAST O LITE 30 LI PLUS HEAT UP SCHEDULE Never enclose a castable in a vapor tight encasement as a dangerous steam explosion may result

The Boiler Dry Out Process Refractory Materials TFL Global

The refractory manufacturer will know the correct refractory placement and curing temperatures for the dry out process 2 Comprehend the Thermal Profiles Various temperatures can have extreme effects on refractory systems While water boils at 212°F chemically combined water boils at different temperatures depending on the composition

Cement Plant Refractories

Monolithic Refractories in the Cement Clinker Cooler and Preheater Monolithic refractories Castable Refractories especially castables and basic gunning mixes are widely used in preheater towers and coolers in North America Advantages of monolithic refractories include ease of application especially for complex geometries ready availability improved time for installation and good

Important Considerations for Refractory Dryouts Startups

Refractory dryout is the controlled process of applying heat to a refractory lining to remove water from the lining system without causing damage to the refractory materials Whenever linings are heated up from ambient temperatures whether it be the initial heatup after a new lining installation or a subsequent heatup of an existing lining after an outage heatup procedures ramp rates and hold

API 936 PRACTICE TEST Flashcards Quizlet

What are the curing times and requirements for Heat Setting and Plastic Refractories Heat Setting plastic refractories shall be allowed to air dry at an ambient temperature of 70F85F 20C 30C for a minimum of 24hrs and oven dried in a form suitable for drying temperatures

Boiler Refractory Dryout

The refractory material was not normally thermally cured at the factory It is not uncommon for moisture to be absorbed by the refractory during final stages of in shop fabrication transit to the job site and before the upstream

Curing and Dryout of RefractoriesHarbisonWalker

POINTS TO REMEMBER WHEN USING CASTABLES

the temperature at that level until all steam dissipates Heat will remove the free water as steam at around 212oF while the water of hydration will be driven off between 400oF and 1600oF Hold temperatures at 400oF to 450oF and again at 1000oF to 1100oF for as many hours as inches thick of the cast piece AVOID DIRECT FLAME IMPINGEMENT ON REFRACTORY

Drying methods for monolithic refractories

completion of curing because mixing water is added for installation Following the removal of the formwork heating up for drying is necessary Heating up for drying to the operational temperature of the installed monolithic refractory lining shall be carefully carried out because rapid heating causes cracks In some cases the problem of explosive

Explosive Spalling of Low Cement Castable Refractories

dryout without further explosive spalling taking place At that point the temperature ramp rate was down to 3°F hr Refractory manufacturers typically provide the end user of their products with a time temperature curve for dryout of their products Such dryout curves are generally developed under controlled laboratory conditions and tend

Explosive Spalling of Low Cement Castable Refractories

Explosive Spalling of Low Cement Castable RefractoriesA Dryout Service Company s Experiences Observations and Recommendations Irwin C Irish Cobane Environmental conditions that result in too low or too high curing temperatures immediately after installation

HARBISON WALKER Handbook of Refractory Practice 2005

tive tools Modern refractories are customized high temperature ceramics designed to withstand the destructive and extreme service conditions needed to manufacture metals glass cement chemicals petroleum and other essentials of contemporary life The History of Harbison Walker The refractories company known as Harbison Walker opened on

Monolithic Refractories Installation and Dryout

This technical report covers the installation and dryout of monolithic refractory lining materials for hydrocarbon processing industry HPI applications It discusses the best practice procedures and techniques used in the installation of refractory concrete as well as those for air and heat setting plastics and ramming mixes In addition it discusses the need for curing and dryout and

Refractory Dry Out Gulf Coast Combustion

The key to a long refractory life is a dryout using GCC s High Velocity Gas Combustion Systems With Gulf Coast Combustion s refractory dry out knowledge and expertise you and your clients will get a long lasting life on your refractory

Understanding Refractory Failure A New Perspective

Curing allows the chemical action to take place inside the refractory and helps ensure that the refractory can reach its maximum strength when properly dried It is recommended that the surface of the refractory be kept moist curing compound wet canvas bags or spraying water or the surrounding atmosphere humid for a period of at least

Alkaline Hydrolysis Resistant and Durable Refractory

Dryout procedures only delay the Alkaline Hydrolysis Reaction they do not eliminate the potential reactions nestled in the matrix of the insulating castables However experience proves that too often the risk and costs of alkaline hydrolysis and related downtime is significant to Owners even with dryout

Refractory lining systemsScienceDirect

Hex mesh is an arrangement of strands of metal to form hexagonal cells in a monolithic anchoring system Hex mesh is typically used with thin 3/4 to 1 in 19–25 mm erosion resistant lining such as cyclones hot wall risers sugar scoops and other hot wall lining systems with severe erosion The hex mesh anchoring system in conjunction with extreme erosion resistant castable

Dryout of Refractory Lining Heat Treatment Hotwork

Rapid heating and local hot spots creating stresses which cause severe cracking or worth damages In most industries it has become widely accepted the only truly effective means of drying out and heating up refractory is to deploy high velocity burners With over 250 high velocity burner units worldwide Hotwork International is the best

API TR 980 Monolithic Refractories Installation and Dryout

In addition it discusses the need for curing and dryout and procedures to achieve successful results This instruction is consistent with API Standard 936 which is the HPI industry standard for the installation quality control of monolithic refractories

Boiler refractory dry out procedure

Boiler Refractory dry out is to ensure proper drying curing of refractory applied on furnace and other components The refractory usually undergoes considerable chemical changes during initial heating Controlled heating through these reactions ensures maximum strength

Refractory Liningan overview ScienceDirect Topics

In Smithells Metals Reference Book Eighth Edition 2004 27 8 Design of refractory linings A refractory lining usually comprises a safety or backup layer behind the working lining in contact with the furnace contents The whole body is encased in a metal shell The temperature gradients in the system and the properties of all materials must be considered

Sparfire Dryout HeatupSPAR Inc is now a part of Calderys

REFRACTORIES FAX 256 P O BOX 909 JACKSONVILLE AL 36265 HEATING SCHEDULE FOR DENSE SPARFIRE PRODUCTS After installation allow to cure at ambient temperature for a minimum of 4 hours or until castable sets up Ambient temperature should be 50°F to 90°F If possible allow the

Monolithic Refractories Installation and Dryout

This technical report covers the installation and dryout of monolithic refractory lining materials for hydrocarbon processing industry HPI applications It discusses the best practice procedures and techniques used in the installation of refractory concrete as well as those for air and heat setting plastics and ramming mixes

Secondary Reformer Refractory Dry Out Operation

refractories as water is the common solvent for mixing refractory material This article covers problems faced during drying out operation is described present information to better explain when there is a need for a refractory dryout and the critical aspects The changes in temperature can have catastrophic effects on refractory systems

REFRACTORY DRYOUT April 23 2002

3 FORMSForms and particularly wooden forms must be removed before dryout The thought process is to leave forms installed to hold the refractory in place until an elevated temperature is reached Most forms are tightly spaced and tend to cover or insulate the hotface during the initial critical stage of the dryout at low temperatures

PDF Understanding Refractory API 936 Reading I Rev 1

heat curing Process of heating used to develop bonding in refractories such as phosphate bonded refractories With these refractories heat curing is concurrent with dryout but not necessarily interchangeable with use of the term as dryout refers only to the

FURNACES AND REFRACTORIESModern Eq

Lightweight refractories of low thermal conductivity find wider applications in low temperature heat treatment furnaces for example in batch type furnaces where the low heat capacity of the refractory structure minimizes the heat stored during the intermittent heating and cooling cycles Insulating refractories have very low thermal conductivity

Magnesia refractory dryout–managing

lation and preheating dryout specifically stages are high risk stages4 During the installation and preheating stages the brick undergoes several changes20 Curing is the formation of hydraulic bonds Curing follows the placement of the material and is limited to wet installations of magnesia refractory bricks

Technical Report 980 Monolithic Refractories

In addition it discusses the need for curing and dryout and procedures to achieve successful results This instruction is consistent with API Standard 936 which is the HPI industry standard for