Red Seal Insulator flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

WHMIS SDS Section 8

Section 8 of a Safety Data Sheet lists exposure controls and personal protective equipment, including exposure limits, engineering controls, and the specific gloves, respirators, and eye protection required for the product.

Respirable silica limit

The 8-hour time-weighted average exposure limit for respirable crystalline silica is typically 0.025 mg/m3 in Canadian jurisdictions; wet methods and local exhaust ventilation are the primary controls during cutting and removal.

Fall protection trigger height

Most Canadian jurisdictions require fall protection at 3 m of working height, though some use 2.4 m; a full-body harness and shock-absorbing lanyard limit free fall to 1.8 m or less.

Confined space atmospheric limits

Acceptable entry atmosphere is oxygen between 19.5 and 23 percent, flammable gas below 10 percent of the lower explosive limit, and hydrogen sulphide and carbon monoxide below their occupational exposure limits.

Scaffold guardrail height

A scaffold guardrail system uses a top rail between 0.9 and 1.1 m above the platform, a mid-rail, and toe boards; the platform must be fully planked and within 300 mm of the work face.

Ladder 4:1 rule

A portable ladder is set so the base is 1 m out from the wall for every 4 m of working height, and the ladder extends at least 1 m above the landing surface for safe access.

Cylindrical heat loss formula

For one cylindrical insulation layer, heat loss per unit length is Q/L equals 2 pi k (T1 minus T2) divided by the natural log of outer radius over inner radius.

Vapour barrier placement

On cold service the vapour retarder is installed on the warm side, which is the outer surface of the insulation, and all joints, seams, and penetrations are sealed with compatible mastic.

Personnel protection threshold

Accessible surfaces above 60 C generally require personnel protection such as a guard or a lower surface temperature, while surfaces below 13 C with high humidity require condensation control design.

Material takeoff waste allowance

A material takeoff lists pipe length by diameter, fitting counts, and jacket quantities, and adds a 5 to 10 percent waste allowance to cover cutting, mitring, and damage.

Cryogenic insulation choice

Cellular glass is specified for below-ambient and cryogenic service because it is closed-cell and impermeable to moisture, while mineral wool suits high-temperature service above 450 C.

Pre-removal isolation

Before removing insulation, lock out and isolate the system, verify zero energy, and confirm the material is not asbestos by label, building register, or bulk sample.

Asbestos friable removal

Friable asbestos-containing insulation requires a controlled abatement procedure with containment, negative pressure, decontamination, and bagging in labelled 6-mil poly containers per jurisdiction.

Galvanic corrosion jacketing

Where copper or brass contacts aluminum jacketing, galvanic corrosion occurs in wet or outdoor service; a separation layer or stainless steel jacketing prevents the reaction.

Chloride stress corrosion cracking

Austenitic stainless steel under insulation between 60 and 175 C can suffer chloride stress corrosion cracking; low-chloride insulation and a protective coating on the steel are the controls.

Coating dew point rule

Coating is applied only when the surface temperature is at least 3 C above the dew point and above 10 C, so moisture does not condense and spoil adhesion.

Staggered insulation seams

Pipe insulation joints are tightly butted and staggered, and each layer's longitudinal seam is offset at least 90 degrees from the seam of the layer beneath it.

Band spacing on straight runs

Mineral wool and fibreglass on straight pipe are secured with 16-gauge wire or stainless bands at 225 to 300 mm centres, with one band within 50 mm of each end.

Elbow segment minimum

A 90-degree elbow is covered with a minimum of three mitred or segmented pieces on small bore, with more segments added as the pipe diameter increases.

Thermal expansion allowance

Steel expands about 12 mm per 10 m for a 100 C temperature change, so insulation is left with gaps at flanges and expansion joints to prevent buckling.

Vertical run support

Insulation on vertical pipe runs above 3 m needs support rings or spacers at intervals so the insulation does not slide down the pipe under its own weight.

Removable fitting covers

Valves, flanges, and strainers are insulated with removable boxes or blankets so the fitting can be serviced without destroying the surrounding insulation and jacket.

Jacket overlap direction

Aluminum jacketing overlaps away from the prevailing weather, with at least 50 mm overlap on horizontal runs and 75 mm on vertical runs to shed water.

Jacket band spacing

Jacket bands are spaced at 300 mm on straight runs and 150 mm near fittings, tensioned so the jacket cannot be lifted by hand.

Stainless jacketing use

Stainless steel jacketing is specified for coastal, chemical, and high-chloride environments because aluminum corrodes quickly in those conditions.

ASJ jacket limits

All-service jacket is a vapour-tight finish used indoors; it is not suitable above 65 C or for outdoor service where weather and UV degrade the surface.

Firestop system matching

A firestop system is listed by assembly and must match the pipe material, diameter, insulation type, and annular space tested; the installed assembly must match the label exactly.

Intumescent firestop

Intumescent firestop material expands when heated to close the annular gap left when plastic pipe burns away; non-intumescent sealant is used for metal pipe penetrations.

Vapour retarder permeance

Permeance is expressed in ng per pascal second square metre; a lower value means the retarder resists moisture vapour flow more effectively and better protects cold insulation.

CUI temperature range

Corrosion under insulation most often occurs on carbon steel in the 60 to 175 C range, especially where water collects at low points or under damaged jacketing.

Thermal imaging inspection

Infrared imaging of insulation under steady load shows missing sections and wet insulation as hot or cold spots; it is not reliable during startup or transient conditions.

Wet insulation replacement

Saturated mineral wool and fibreglass lose R-value and must be replaced rather than dried in place, because trapped moisture also drives corrosion under insulation.