Document X8wODkvvwv42gRp5d1b4Do5KR

^.TMEUiRD -aiE^OMPAffT..OF -CALIFORNIA ' -ENGINEERING' DEPARTMENT - SAN FRANCISCO SPECIFICATION NO. EG-I38I-F MAY 25, 1967 SECTION A PAGE 1 OF 8 SPECIFICATION NO. EG-I38I-F THERMAL INSULATION FOR HOT LINES AND VESSELS SECTION A TECHNICAL REQUIREMENTS 1.0 SCOPE This Specification covers the requirements for insulating vessels, tanks, heat exchangers and lines with hot surfaces. 2.0 PIPING 2.1 Piping shall be insulated in accordance with form EF-63O and Drawing GA-N-99783. The specified thickness of insulation does not include weather coating. 2.2 Emulsion type weather^coating shall not be applied when atmospheric precipitation or -condensation may wet the finished surface within 24 hours after application.- 2-3 Traced lines shall beijfnsulated with oversized rigid pipe covering, calcium silicate of a brand approved by COMPANY. Covering sections shall all be of the same I.D. with a maximum clearance of l/4-inchrbetween the tracer or pipe and insulation. Materials and insulating techniques used shall be as shown on Drawing GA-N-99783 extffipt as follows: At points where steam tracing is helically wound, the tracing shall be covered with 28 ga. galv. steel to support the insu lation. and an oversized insulation sleeve, tightly fitting over the pipe insulation, shall be used. The thickness of the sleeve shall be the same~as that of the pipe insulation. At each such helix, the pipe insulation shall be ended at a point 1-inch short of each* endJYof helix. The oversized sleeve shall be lapped 2 inches past therends of the pipe insulation. On all steam traced lines, a bare copper wire (l4 gage) shall be installed under the tie wire of the weather coat for the full length of the steam tracer to mark its route. 2.4 All metal jacket weather coating shall be secured with stainless steel straps. Chevron BB 015768 STANDARD OIL COMPANY OF CALIFORNIA ENGINEERING DEPARTMENT - SAN FRANCISCO SPECIFICATION NO. EG-I38I-F MAY 25, 1967 SECTION A PAGE 2 OF 8 2.5 All insulation and weathercoating used'on or within 25 feet of furnaces shall be fire-resistant. Galvanized steel or stainless steel weathercoating shall be used instead of aluminum. Asphalt or other flammable weathercoatings are not acceptable. 3.0 VESSELS, COLUMNS, AND HEAT EXCHANGERS 3.1 Block insulation shalllbe applied in accordance with form EF-630 and Drawing GA-N-99785v~ The specified thickness, of insulation does not include weather coating. 3-2 Vertical vessels 3-ft dpi larger in diameter, operating below 350E may be insulatedd^th glass or mineral wool fiber blankets. Details shall be as specified in Paragraph 4.0 below. 3.3 Acceptable weather coat"materials are: 3.31 Asbestos cement bheet 3/l6-inch thick, conforming to ASTM C-220, type F (Johns-Manville Asbestocite unless otherwise specified), applied as specified in Paragraph it-.3 below. Precurved sheets are required for diameters 10-ft and under. 3.32 Corrugated (O.Ol6^' min. thickness) or flat (0.019" min. thickness) aluminum sheet with vapor barrier (Childers or Premetco unless otherwise specified). Application shall be as specified dn Paragraph 4.3* 3-33 Asphalt emulsion_coatings (Chevron Asphalt Co's Laykold, or Johns-Manvllie" Insulkote unless otherwise specified). These may be used only on block or rigid insulation where temperature of insulation surface will not exceed 175F. They shall not be: applied when atmospheric precipitation or condensation,may wet the finished surface within 24 hours after application. 3.4 Nameplates and weep-hole nipples on reinforcing pads shall not be covered. ~ 3.5 Insulation for exchanger channels shall not include insulation of channel covers. Exchanger flanges shall not be insulated. 3.6 Each section of a double pipe exchanger shall be insulated as a single unit. Contimious insulation around a.multi-sectional unit is permissible only with specific written approval by COMPANY'. Chevron BB 015769 4.0 TANKS STANDARD OIL CwJPANY 07 CALL.-ORNIA ENGINEERING DEPARTMENT - SAN FRANCISCO SPECIFICATION NO. EG-1381-F MAY 25, 1967 SECTION A PAGE 3 OF 8 -- 4.1 Shell Insulation - Tajik shells shall he insulated with glass or mineral wool (Owens-Corning FF-613 semi-rigid hoard), maximum temperature limit 35QF. The material shall have a minimum density of 3 lhs/cubic ft. Refer to Drawing GB-N99995* 4.11 Blankets shallTbe placed with the long dimension vertical and with vertical joints staggered. Blankets shall be secured to thertank with l4-gage galvanized wire fastened to weldingstuds/ (See 4.22 and 4.32 below) to hold blanket in place until weather coating- is applied. The blanket insulation shall extend to within 12 inches of tank bottom. The space between bottom of insulation and tank bottom shall be filled:with 12-inch high foam glass block. Blocks shall be held bight to tank with 14-gage 300 series stainless steel:wire. 4.12 Insulation shall be fitted around nozzles, manways, and other appurtenances to allow room for bolt removal. These appurtenances shall not be insulated and weather coat shall be completely sealed with weather-prowf material to prevent leakage- into the insulation. Insulation around structural members supporting stairs, etc., shall be suitably weather-proofed, and flashed with aluminum (l6-gage minimum) or galvanized.jlteel. 4.2 Asbestos Cement Sheet:Weather Coating 4.21 Materials - Weather coating shall be 3/l6-inch thick asbestos cement sheets per ASTM C-220 type F. Threaded welding studs shall be solid type 304 austenitic stainless stecL_or composite with type 304 steel at exposed end and carbon steel at tank attachment end. Minimum diameter shall be 5/16 inch. Stainless steel stud nuts or aluminum caps shall be used. All external mltal on the surface of the finished asbestos cement weather ..coating, except flashing but including studs, stud nuts, battens and bands, shall be austenitic stainless steel. Flashing may be aluminum (l6 gage minimum) or lead. Chevron BB 015770 QiAiWmw v VWl'tff'.I.I J. W.C ENGINEERING DEPARTMENT - SAN FRANCISCO SPECIFICATION NO. EG-1381- F MAY 25, 1967 SECTION A PAGE k CF 8 h.22 Installation. -_JEhe 4-ft by 8-ft asbestos cement sheets shall be oriented with the long dimension horizontal. Threaded welding studs shall be^spaced between the sheets of the asbestos cement b*ard ohr2-ft vertical centers and 8-ft horizontal centers,, and inraddition there shall be one stud in the center of each asbestos cement board. Center studs shall be on 8-ft horizontal centers and ^5-inch vertical centers. Studs shall be secured with a stud welding gun and tested with a light hammer blow ta be sure the weld is sound. Asbestos cement, sheets shall be drilled to fit studs snugly and mastic compound shall be used'to seal the outer washer to prevent entrance of water at stud holes. The asbestos cgaent sheets shall be lapped 3 inches' on the horizontal joints, with the upper sheet on the outside. The upper sheet:shall be supported from the lower by stain less steel "S"ror "Z" clips, or by providing a supporting ledge in the .batten over the vertical joint. The sheets in each row shall be placed with vertical edges not more than 2 inches apart, centered on studs,' and the joint covered with r/l6-inch minimum thickness by 4--inch wide austenitic stainless steel battens secured with threaded stainless steel nuts to-the studs on 2-ft vertical centers. The sheets shall be further secured by austenitic stainless steel straps, 3/V-inch wideiBy 0.020 inches thick placed above the studs at each 3-inch horizontal, lap and the center of each sheet "on approximateL 2-ft vertical centers." Straps for tanks 18-ft and largr in diameter shall be secured to heavy stainless steeX.spring clips. See Erg. GE-Nooocs Det. "K". Shell insulation shall be flashed with lead (minimum 2-1/2--lbs) or aluminum (l6-gage minimum) to prevent moisture from entering the insulation at openings, structural connections, or at the eaves. 4.23 Where asbestos^ement sheet weather coating is to be painted, the sheets shall be sealed on back and edges (before instal lation on tank) with a vinyl sealer (Amercoat 1637 unless otherwise specified). Chevron BB 01577'! STANDARD OIL COMPANY OF CALIFORNIA ENGINEERING DEPARTMENT - SAN FRANCISCO SPECIFICATION NO. EG-1381F MAY 25, 1967 SECTION A PAGE 5 OF 8 4.3 Aluminum Weather Coating When aluminum weathe^rcoating is specified, the following procedures shall be used. ~^ 4.31 Materials - Materials shall be 1-1/4 inch or 2-1/2 inch deep corrugatedhaluminum sheet, O.Ol6 inch minimum thick ness. Temper shall be 3/4 hard with copper content not exceeding 0.40 All attaching fixtures shall be austenitic stainless steel except: (a) sheet metal screws may be aluminum; (b) stud caps may be aluminum; and (c) studs may be composite, i.e., austenitic top and carbon stee.l base. All aluminum sheets shall have a vapor barrier (Childers or Premetco) unless specified otherwise. 4.32 Installation -TAI1 sheets shall be lapped two corrugations on the verticalZand 4 inches on horizontal seams (see drawing G.B- N99S25). ' Each sheet shall be supported horizontally byjtwo "S" clips and shall be attached to tank by three 5/l6-inch diameter welding studs (Nelson Setlok type unless otherwise specified) on each vertical seam. Studs shall be located in the crown of corrugation nearest to edge jpf sheet. First stud shall be 6 inches from bottom of "sheet. The other two studs shall be equally spaced "between bottom studs and bottom studs in next sheet above! Maximum vertical spacing between studs shall be 48 inches (12-ft sheets). Studs shall be secured with a stud welding gun and tested with a light hammer blow to be sure the weld!is sound. If stud spacing exceeds 48 inches, additional equally spaced studs shall be used. In line with ancEspaced on center between studs shall be a 1/2- inch No.^IO sheet metal screw to assure tight contact hetweenllapped sheets. Aluminum sheets shall be impaled on the "studs using a rubber hammer. Sheets shall not be drilled. t Horizontal joints shall be fastened on 6-inch centers with gasketed, self-tapping, sheet metal screws (see drawing C-B-N9S995 for spacing and types of studs and screws). Aluminum sheeting shall be held against the insulation by 0.020 inch by 3/4-inch stainless steel straps on 4-ft maximum vertical centers"! Maximum length of strap without a break shall be 50 ft. iZExpansion springs as shown on drawing GB-N99995 shalirjje installed in each strap. Folded straps or Chevron bb 015772 STANDARD OIL uOMPAl'IY OF CALIFORNIA. ENGINEERING DEPARTMENT - SAN FRANCISCO SPECIFICATION NO. EG-1381-F MAY 25, 1967 SECTION A PAGE 6 OF 8 corrugated straps- or other tensioning devices having relaxation tendencies are not acceptable. Straps'shall be supported withJT-clips fastened to the l/2-inch No. 10 sheet metal screws shown on drawing GB-N99995 Weather coating shall terminate 2 inch from tank, bottom. Typical details for finishing top of weather coating are shown on drawing GB-N99995 4.4 Roof Insulation -- - Roof insulation shall ;_be 12-lb Fiberglas roof deck, J-M Thermobestos unless otherwise specified, and shall be secured by impaling the blocks on welding studs: spaced to provide four studs per block of insulation. Lengths o_ studs shall equal' but not exceed the thickness of the insulation. The: roof shall be finished either with l/4-inch thick asbestos cement':gheets meeting ASTM C-220, Class F} or with a mopped down l/2-inch thick fiberboard. Joints shall be butted and topped with a built-up/four layers of 15-lb asphalt saturated asbestos roofing feltTZi 5.0 MISCELLANEOUS EQUIPMENT ~: 5.1 Pumps, turbines, and .other miscellaneous equipment shall be insulated only when specified by^CCMPANY. Access shall be provided to pump and turbine glands and other points requiring periodic maintenance. 5.2 Plastic insulation, Johns-Manville No. 450 unless otherwise specified, shall be u3M on any surface which is not suited to block insulation, but:=dhe use of plastic insulation shall be kept to a minimum. Insulation shall be applied on clean surfaces to recommended thicknesses. If a second layer is required plastic insulation shall be allowed to set and 1-inch by 20-gage galvanized hexagonal lifesh applied over the entire plastic insulation surface with butted joints laced together with No. 18 gage galvanized iron wire and secured to the insulation with 1-1/2-inch copper vine staples, placed to hold mesh snugly against the insulation. The insulation, when dry, shall be covered with weather coating per drawing GA-N99785 Chevron BB 015773 STANDARD OIL COMPANY OF CALIFORNIA ENGINEERING DEPARTMENT - SAN FRANCISCO SPECIFICATION NO. EG-I38I-F MAY 25, 1967 SECTION A PAGE 7 OF 8 6.0 POLYURETHANE INSULATION 6.1 Preformed block or femed-in-place polyurethane foam Insulation may be used to insulate piping and equipment operating up to a maximum metal temperature of l80F when specifically approved by COMPANY in writing.. _ Polyurethane insulation shall not be used within 25 feet of any fired heater. ^ 6.11 Materials: AlT polyurethane insulation shall have a fireretardant addifive, and shall be classified non-burning ay ASTM D-lb92-59l; Test for Flammability of Plastics, Foams and Sneeting (Tentative). Insulation shall have a maximum thermal conductivity of 0.15 Btu/hr-sq.ft./F per inch at 0F. The insulation shall have a minimum density of 2 0 and a maximum Tlensity of 2.5 lb/ft^. ^ 6.2 Preformed Block Application - Preformed block insulation shall be installed in accordance with paragraphs 2.0, 3-0, and k.O of this Specification. Polyurethane shall not be used on traced lines where the tracer metal, temperature is over l80F. 6.3 Foamed-in-Place Application - Polyurethane resins shall contain suitable admixtures^hnd shall be applied in such a manner that the insulation is of the required thickness and of unicellular con struction. The insulation shall consist of many small cells approximately equalfin size. The polyurethane liquid shall have a 30-^0 second delay before foaming takes place to allow time for the liquid to run into confined areas and hard-to-get-at locations such as around vacoffin rings on vessels and large piping. 6.31 Application may be by gunning, by frothing, or by pouring in place, in accordance with paragraphs 2.0, 3-0> and L.O above. 6.32 All polyurethane pre-foam liquid shall be placed into forms made of 0.0l6clinch flat or corrugated aluminum sheets (weather coating) spaced from the vessel by polyurethane blocks. Sheets shalithe sized to reduce the number of joint overlaps as much as possible. "S" clips shall be used to keep the aluminum sheedts in place. The sheets shall be lapped L inches on both horizontal and vertical seams. The sheets shall be fastened on With stainless steel straps. All edges of the sheets shallToe sealed by pop rivets or sheet metal screws at 12 inch maximum spacing. Chevron BB 015774 STANDARD OIL COMPANY OF CALIFORNIA ENGINEERING DEPARTMENT - SAN FRANCISCO SPECIFICATION NO. EG-I38I-F MAY 25, 1967 SECTION A PAGE 8 OF 8 6.321 Aluminas sheeting shall ."be held against the insulation by 0.020 inch by 3/4-inch stainless steel straps on 4-ft maximum vertical centers. Expansion springs as shown on drawing GA-N99995 shall be installed in each strap. Folded straps, corrugated straps, or other tensioning devices having relaxation tendencies are not acceptable. Straps shall be supported with j-clips fastened to the l/2-inch No. 10 'sheet metal screws shown on drawing GA-N99995 6.33 Gunning, frothing, or pouring in place shall be done so that there are essentially no voids in the insulation and in areas around stiffening rings. Any voids shall be repaired by refoaming or by installation of fitted preformed blocks glued to trimmed fosm. 6.3b Individual pauFs or lifts shall be limited to 18 inches vertical riseito avoid compression of the foam. 6.4 Weather Coating - Banded aluminum shall be used as a weather coating for preformed blocked? foamed-in-place insulation. No vapor barrier is required under the weather coating. 6.5 Inspection - Foam density shall be checked by taking one-inch diameter core samples through the metal jacket and visually comparing the core with a polyurethane standard of known thermal conductivity. The core shall be inspected for cell size and homogeneity. The core shall be refoaffied and a weather-tight patch placed over the metal jacket. Sample cores shall be taken at points indicated by COMPANY. 7-0 FORMS AND DRAWINGS The following forms and^drawings are a part of this Specification: EF-630 Summarypof Fireproofing and Insulation for Equipment and! Piping GA-N-99783 GA-N-997S5 GA-N-99995 GB-N-99993 Standard. Insulation for Hot Piping Standard. Insulation for Hot Vessels Standard Insulation and Weather Proofing Details Standard Insulation Item Numbers Chevron BB 015775