Expletive

When using the combination of there + be, there is called an “expletive”.

Comparative, or object, pronouns

Comparative, or object, pronouns are used in place of the object of the verb.

Possessive pronouns

Possessive pronouns show possession of something by someone. They are not followed by nouns, but stand alone. Possessive pronouns replace a noun that is understood by context.

Possessive adjectives

Possessive adjectives are pronouns which are used as adjectives and are located directly before another noun.

Reflective pronouns

Reflective pronouns indicate that the subject of a sentence is both giving and receiving the action of the verb.

Appositive

An appositive is a word, phrase, or clause in apposition – that is, it is a word placed next to another word so that the second explains the first.

Indefinite pronoun

An indefinite pronoun refers to something that is not definite, specific, or exact. Most indefinite pronouns are considered singular and require singular verbs, but some require plural verbs and some can be used with either singular or plural verbs depending on the noun.

Negative Commands

A negative command adds the word don’t before the simple verb.

Indirect Command

Indirect commands will normally use the verbs ask, tell, order, or say. They are followed by the infinitive of the verb (to + verb).

Negative Indirect Command

Add the word not before the infinitive verb to make an indirect command negative.

Subject pronouns

Are used in place of subject nouns.The pronoun we, you and us can be directly followed by a noun in order to make it clearer to whom is being referred.

Linking Verb

A verb that can be immediately followed by an adjective is called a linking verb

Examiner

A person who performs specific NDE on equipment but does not evaluate the results of those examinations, unless specifically trained and authorized to do so by the owner or user. The examiner may be required to hold certifications as necessary to satisfy the owner or user requirements.

Erosion

A reduction in material thickness due to mechanical attack from a fluid, expressed in inches or millimeters.

Economizer

A section of the boiler where incoming feedwater temperature is raised by recovery of the heat from flue gases leaving the boiler.

Duct

A conduit for air or flue gas flow.

Downcomer

Boiler tubes or pipes where the fluid flow is away from the steam drum

Damper

A device for introducing a variable resistance for regulating volumetric flow of gas or air.

Butterfly Damper

A single-blade damper pivoted about its center

Bridgewall

A division or gravity wall which separates two adjacent heater zones.

Breeching

The heater section where the flue gases are collected after the last convection coil for transmission
to the stack or the outlet duct work.

Backup layer (Boiler)

Any refractory layer behind the hot face layer