Our tapered thermowells provide greater rigidity than straight shank styles. They are well-suited to applications of high fluid velocity.

Transcription

1 Thermo-ouple Products o. Included in our thermowell series are standardized wells of threaded, NI flanged, Van tone and Weld-in types. Threaded wells are made in readily welded or brazed materials for installations requiring seal welding or brazing. The pipe thread provides the mechanical strength, the weld merely seals. NI flanged wells consist of a bar-stock well which is permanently welded to a top quality flange. tandard construction uses primary J groove weld and a bevel groove secondary weld. Both welds are machined to produce a clean fillet. This double welded construction eliminates possibility of crevice corrosion since no open joints are exposed from either inside or outside the installation. ocket weld types of wells can be installed easily by merely welding into place to form a clean and tight connection. The insertion length rule of thumb of ten diameters is not always practical when installing thermowells. are should be exercised to make certain that the sensitive tip is totally immersed into the medium being measured. bove all, be sure that the dead length i.e. the length required to pass through walls, pipe fittings, etc. is taken into account when choosing the necessary insertion length. Our tapered thermowells provide greater rigidity than straight shank styles. They are well-suited to applications of high fluid velocity. The thermowells shown on the following pages are available in standard bore diameters of.6" for thermocouple elements to 4 gauge wire and.385" for thermocouple elements to 8 gauge wire. Both are suitable for use with metal sheathed elements of compatible diameters. 65

2 Thermo-ouple Products o Typical Thermowell with Flange Extension Nipple Terminal ead aterial - The Longevity Fa c t o r In general, the thermowell material chosen for the installation is governed mainly by the corrosion conditions to which the well is exposed. Recommended materials for various services are given in the corrosion table on pages 67 to 69. The high mirror polish given to all stainless and monel wells provides maximum corrosion resistance. ometimes the major consideration is strength rather than corrosionresistance. For example, a high pressure water service may require a stainless steel well, while from a corrosion standpoint, a brass well would be satisfactory. onnection - The Installation Fa c t o r In these pages you will find standardized wells of threaded, flanged (.N..I. and Van tone), and socket welded types with standard bore sizes. Threaded wells are all made in readily welded or brazed materials for installations requiring seal welding or brazing. The pipe thread provides the mechanical strength, the weld merely seals. Flanged wells other than Van tone type) consist of a bar-stock well which is permanently welded to a top quality flange. tandard construction uses a primary J groove weld and a bevel groove secondary weld. Both welds are machined to produce a clean fillet. this double welded construction eliminates possibility of crevice corrosion since no open joints exposed from either inside or outside the installation. ocket welding types of wells are simple to install - merely welded into place.these wells fit.n..i. standard socket weld coupling of flanges. The resulting installation is clean and tight. I n s e rtion Length - The c c u ra cy Fa c t o r The distance from the end of the well to the underside of the thread, or other connection means, (designated as U ) is the insertion length. For best accuracy, this length should be long enough to permit the entire temperature sensitive part of the well to project into the temperature medium being measured. properly installed thermowell will project into the liquid and amount equal to its sensitive length plus at least one inch. In air or gas, the bulb should be immersed into the sensitive length plus at least three inches. Thermocouples and thermistors have short sensitive lengths and therefore can use the smallest insertion lengths. Bi-metal thermometers, resistance thermometers, and liquid-in-glass thermometers have bulbs with sensitive portions between one and two inches long. Therefore, the minimum standard insertion length of -/" must be entirely immersed in liquid for proper accuracy. Filled system thermometer bulbs may have sensitive portions from one to several inches in length. etermine the sensitive length of bulb before choosing an insertion length. bove all - be sure that dead length i.e. - that required to pass thru wall, pipe fittings, etc. is taken into account when choosing the necessary well insertion length. B o re ize - The Interch a n ge ability Fa c t o r y everal types of temperature measuring instruments are used in most installations. The selection of a standard bore diameter provides extreme flexibility; the same well can accommodate thermocouple resistance thermometer, bi-metal thermometer, or test thermometer. The bore size of wells shown in this catalog cover the most commonly used temperature sensing elements as follows:.6 iameter Bore: Bi-metal Thermometers (/4" stem) Thermocouples - (# Gauge) Liquid-in-glass Test thermometers (Unarmored) Other elements having.5" maximum diameter..385 iameter Bore: Bi-metal Thermometers (3.8" tem) Thermocouples - (#4 Gauge) Liquid-in-glass Test thermometers (rmored) Other elements having.377" maximum diameter. Tap e red or traight hank - The Velocity Rating Fa c t o r Tapered shank wells provide greater rigidity for the same sensitivity. The higher strength to weight ratio gave these wells higher natural frequency than for equivalent length straight shank wells, thus permitting operation at higher fluid velocity. 66

3 Thermo-ouple Products o. INTROUTION TO TEROWELL eat Treating Thermowell aterial election Guide pplication nnealing Up to 74 (3 F) Over 74 (3 F) arburizing ardening Up to 86 (5 F) 93 (5 to F) Over 93 ( F) Nitriding salt baths yanide Neutral igh peed Iron and teel Basic oxygen furnace Blast furnaces owncomer tove dome ot blast main tove trunk tove outlet flue Open hearth Flues and stack heckers Waste heat boiler Billet heating slab heating and butt welding Up to 93 ( F) Over 93 ( F) Bright annealing batch Top work temperature Bottom work temperature ontinuous furnace section forging oaking pits Up to 93 ( F) Over93 ( F) Nonferrous etals luminum elting eat treating or bronze Lead agnesium Tin Zinc Pickling tanks ement Exit flues aterial Black teel Inconel 6, a Type 446 Black teel Inconel 6, a Type 446 eramic b Type 446 Nickel (P) Type 446 eramic b Quartz Inconel 6, Type 446 ilicon carbide Inconel 6 Inconel 6 Black steel Inconel 6, Type 446 Inconel 6, ermets Inconel 6, Type 446 Inconel 6, Type 446 ilicon ceramic carbide b Not required (use bare Type J thermocouple) Type 446 Inconel 6, ceramic b Inconel 6 ilicon ceramic carbide b ast iron (white-washed) Black steel Not required (use dip-type thermocouple) Type 446, black steel Black steel, cast iron Extra heavy carbon steel Extra heavy carbon steel hemical Lead Kilns, heating zone Inconel 6 Inconel 6, Type 446 a Trademark of the International Nickel o. b ue to susceptibility to cracking, sudden thermal shocks should be avoided. c ue to susceptibility to cracking, sudden thermal shocks should be avoided. Thermowell aterial election Guide pplication eramic Kilns ryers Vitreous enameling* Glass Fore hearths and feeders Lehrs Tanks Roof and wall Flues and checkers Paper igesters Petroleum ewaxing Towers Tranfer lines Factioning column Bridgewall Power oal-air mixtures Flue gases Preheaters teel lines Water Lines Boiler tubes Gas Producers Producers gas Water gas arburetor uperheater Tar stills Incinerators Up to 93 ( F) Over 93 ( F) Food Baking ovens harretort, sugar Vegetables and fruit hemical cetic acid to 5% (7 F) 5% ( F) 99% to (7 to F) aterial eramic b and silicon carbide c ilicon carbide, black steel Inconel 6, Type 446 Platinum thimble Black steel eramic a Inconel 6, Type 446 Type 36, Type 446 Type 34, 3, 36, 3, 347 carbon steel Type 34, 3, 36, 3, 347 carbon steel Type 34, 3, 36, 3, 347 carbon steel Type 34, 3, 36, 3, 347 carbon steel Type 34, 3, 36, 3, 347 carbon steel 34 Black steel, Type 446 Black steel, Type 446 Type 347 or 36 Low carbon steels Types 34, 39 or 3 Type 446 Inconel 6, Type 446 Inconel 6, Type 446 Low carbon steels Inconel 6, Type 446 eramic (primary) silicon carbide (secondary) a Black steel Black steel Type 34, astelloy, d Type 36, astelloy, d Type 43, astelloy, d lcohol, ethyl, methyl to (7 to F) Type 34 mmonia ll concentration (7 F) Type 34, 36 mmonium cloride ll concentration (7 F) Type 36, d Trademark of the abot orp. e Trademark of the river-arris o. f Trademark of the river-arris o. 67

4 Thermo-ouple Products o INTROUTION TO TEROWELL Thermowell aterial election Guide pplication hemical (continued) mmonium nitrate ll concentration to (7 to F) mmonium sulphate, % to saturated ( F) Barium chloride, all concentrations, (7 F) Barium hydroxide, all concentrations, (7 F) Barium sulphite Brines Bromine Butadiene Butane Butylacetate Butyl alcohol alcium, hlorate, dilute alcium hydroxide % to % ( F) 5% ( F) arbolic acid, all, ( F) arbon dioxide, wet or dry hlorine gas ry, (7 F) oist, -7 to ( to F) hromic acid, % to % ( F) itric acid 5% (7 F) 5% ( F) oncentrated, ( F) opper nitrate opper sulphate resols yanogen gas ow therm f Ether Ethyl acetate Ethyl chloride, (7 F) Ethyl sulphate, (7 F) Ferric chloride, 5% (7 F) to boiling Ferric sulphate, 5% (7 F) Ferrous sulphate, dilute, (7 F) Formaldehyde Formic acid, 5% to 66 (7 to 5 F) Freon Type 36 Type 36 aterial, astelloy Low carbon steels Nichrome, c astelloy Tantalum opper,, astelloy Type 36, astelloy Type 36 7-T4 aluminum,, nickel Type 36, astelloy Type 36, astelloy (all concentrations), astelloy (all concentrations) Type 36, astelloy (all concentrations) Type 36, astelloy (all concentrations) Types 34, 36 Types 34, 36 Types 34 Low carbon steels,, low carbon steel Tantalum, astelloy Types 34, 36 Type 36 ryers Thermowell aterial election Guide pplication aterial hemical (continued) Gallic acid, 5% to 66 (7 to 5 F) Gasoline, (7 F), low carbon steel Glucose, (7 F) Glycerine, (7 F) Glycerol ydrobromic acid, 98% ( F) astelloy B ydrochloric acid, %, 5% (7 F) %, 5% ( F) 5% to ( F) astelloy astelloy B astelloy B ydrofluoric acid, 6% ( F) astelloy, ydrogen peroxide, to ( F) Types 36, 34 ydrogen sulphide, wet and dry Types 36 Iodine, (7 F) Tantalum Lactic acid 5% (7 F) 5% 66 (5 F) % F) agnesium chloride, 5% (7 F) 5% F) agnesium sulphate, hot and cold uriatic acid, (7 F) Naptha, (7 F) Natural gas, (7 F) Nickel chloride, (7 F) Nickel sulphate, hot and cold Nitric acid 5% (7 F) % (7 F) 5% ( F) 65% ( F) oncentrated, (7 F) oncentrated, ( F) Nitrobenzene, (7 F) Oleic acid, (7 F) Oleum, Oxalic acid 5% hot and cold % ( F) Oxygen (7 F) Liquid Elevated temperatures Palmitic acid Pentane Phenol Type 36 Tantalum Tantalum, 36, 36, 36 Type 36, 36 Tantalum Type 36 Type 36 teel Type 36 Type 34 Types 34, 36 a Trademark of the International Nickel o. b ue to susceptibility to cracking, sudden thermal shocks should be avoided. c ue to susceptibility to cracking, sudden thermal shocks should be avoided. d Trademark of the abot orp. e Trademark of the river-arris o. f Trademark of the river-arris o. 68

5 Thermo-ouple Products o. INTROUTION TO TEROWELL Thermowell aterial election Guide pplication hemical (continued) Phosphoric acid %, 5% (7 F) % (7 F) % ( F) 3% to (7 to F) 85% to (7 to F) Picric acid, (7 F) Potassium bromide, (7 F) Potassium carbonate, % (7 F) Type 36 astelloy astelloy B astelloy B Type 36 aterial, Type 36 Potassium chlorate, (7 F) Potassium hydroxide 5% (7 F) 5% ( F) 6% ( F) Type 36 Potassium nitrate 5% (7 F) 5% ( F) Potassium permanganate, 5% (7 F) Potassium sulphate, 5% (7 F), Type 36 Potassium sulphide, 5% (7 F), Type 36 Propane, low carbon steel Pyrogallic acid Quinine bisulphate, dry Quinine sulphate, dry eawater alicylic acid odium bicarbonate ll concentrations, (7 F) 5% 66 (5 F) odium carbonate, 5% to 66 (7 to 5 F) odium chloride, 5% to 66 (7 to 5 F) aturated to (7 to F) odium fluoride, 5% (7 F) odium hydroxide odium hypochlorite, 5% still odium nitrate, fused odium peroxide odium sulphate, (7 F) odium sulphide, (7 F) odium sulphite, 3% 66 (5 F) odium dioxide oist gas, (7 F) Gas, 3 (575 F) ulphur ry olten Wet Type 36 Types 34 or astelloy Nickel Types 34 Types 34, 36 Types 34, 36 Types 36 Types 36, Types 34, 36, astelloy Types 36, astelloy Type 36 Types 34, 36 Type 36 Type 36 Types 34, 36 Type 36 Thermowell aterial election Guide pplication hemical (continued) ulphuric acid 5% to (7 to F) % to (7 to F) 5% to (7 to F) 9% (7 F) 9% ( F) Tannic acid, (7 F) Tartaric acid, (7 F) 66 (5 F) Toluene Tu r p e n t i n e Whiskey and wine Xylene Zinc chloride Zinc sulphate 5% (7 F) aturated, (7 F) 5% ( F) aterial astelloy B, Type 36 astelloy B astelloy B astelloy B astelloy, astelloy B Type 36 7-T4 aluminum, low carbon steel Types 34, 36 Types 34, nickel opper Types 34, 36 Types 34, 36 Types 34, 36 a Trademark of the International Nickel o. b ue to susceptibility to cracking, sudden thermal shocks should be avoided. c ue to susceptibility to cracking, sudden thermal shocks should be avoided. d Trademark of the abot orp. e Trademark of the river-arris o. f Trademark of the river-arris o. Thermo-ouple Products o. Reference harts and Tables on pages are courtesy of the merican ociety for Testing and aterials. Taken from publication TP 47OB, anual on the Use of Thermocouples in Temperature easurement. 69

6 Thermo-ouple Products o TNR TEROWELL eries 6 tandard Bore ize:.6" Reduced Tip for Faster eat Response Plug and hain Process onnection P /" " " iameter Q 5/8" " 7/8" arbon teel (8) Inconel 6 P ROE ONNETION P / /" NPT " NPT " NPT If lagging extension is required see 6 eries /" 4-/" 7-/" -/" 3-/" 6-/" -/"!etric Ord e rs We l c o m e mm 7

7 Thermo-ouple Products o. TNR LG TEROWELL eries 6 tandard Bore ize:.6 Reduced Tip for Faster eat Response Plug and hain Process onnection P /" " " iameter Q 5/8" " 7/8" / arbon teel (8) Inconel 6 P ROE ONNETION P / /" NPT " NPT " NPT.5 -/" T = "!etric Ord e rs We l c o m e mm /" T = 3" 7-/" -/" 3-/" 6-/" -/" 7

8 Thermo-ouple Products o EVY UTY WELL eries 6 tandard Bore ize:.6" Tapered esign to Provide Greater Rigidity Plug and hain Process onnection P /" " " iameter Q 5/8" 7/8" -/6" arbon teel (8) Inconel 6 P ROE ONNETION P / /" NPT " NPT " NPT If lagging extension is required see 65 eries /" 4-/" 7-/" -/" 3-/" 6-/" -/"!etric Ord e rs We l c o m e mm 7

9 Thermo-ouple Products o. EVY UTY WELL eries 65 tandard Bore ize:.6" Tapered esign to Provide Greater Rigidity Plug and hain Process onnection P /" " " iameter Q 5/8" 7/8" -/6" arbon teel (8) Inconel 6 P ROE ONNETION P / /" NPT " NPT " NPT.5 -/" T = " /" T = 3" 7-/" -/" 3-/" 6-/" -/"!etric Ord e rs We l c o m e mm 73

10 Thermo-ouple Products o EVY UTY WELL eries 63 tandard Bore ize:.385" Tapered esign to Provide Greater Rigidity Plug and hain Process onnection P " " iameter Q 7/8" -/6" arbon teel (8) Inconel 6 P ROE ONNETION P " NPT " NPT If lagging extension is required see 635 eries /" 4-/" 7-/" -/" 3-/" 6-/" -/"!etric Ord e rs We l c o m e mm 74

11 Thermo-ouple Products o. EVY UTY WELL eries 635 tandard Bore ize:.385" upplied with a tandard Lag Length Plug and hain Process onnection P " " iameter Q 7/8" -/6" arbon teel (8) Inconel 6 P ROE ONNETION P / /" NPT " NPT " NPT.5 -/" T = " /" T = 3" 7-/" -/" 3-/" 6-/" -/"!etric Ord e rs We l c o m e mm 75

12 Thermo-ouple Products o TET WELL eries 64 tandard Bore ize:.385" Plug and hain tandard arbon teel (8) Inconel 6 / P ROE ONNETION P /" NPT " NPT " NPT LIITE PE WELL eries 65 tandard Bore ize:.6 Plug and hain " 4" 6" 8" " "!etric Ord e rs We l c o m e mm arbon teel (8) Inconel 6 P ROE ONNETION P " NPT " NPT For special requirements contact factory. /" NPT - Not available.65 Only available in -5/8" ( U ) 76

13 Thermo-ouple Products o. OKET - WEL WELL eries 66 tandard Bore ize:.6" or.385" Used in eal Welded pplications for aximum Vessel Integrity Plug and hain Pipe ize P B Q ".6" ".385" 49/64" ".6" 7/8".385" 7/8" arbon teel (8) Inconel 6 BORE IETER B ".385" PIPE IZE " Pipe (.5 Nom. O..) Pipe (.35 Nom. O..) /" 4-/" 7-/" -/" 3-/" 6-/" -/"!etric Ord e rs We l c o m e mm 77

14 Thermo-ouple Products o FLNGE TEROWELL eries 67 tandard Bore ize:.6" or.385" Flange is Fully Welded to Thermowell Plug and hain Bore B.6".385" iameter Q " 7/8" FF arbon teel (8) Inconel 6 BORE IETER B ".385" " 4" 7" " 3" 6" " FF RF RTF FRF F I N G Flat Face Raised Face Ring Type Joint mooth Face, Raised Face R T I N G 5 lb. 3 lb. 6 lb. 9 lb..5 3 FLNGE IZE ".5" " 3"!etric Ord e rs We l c o m e mm 78

15 Thermo-ouple Products o. VN TONE TEROWELL eries 68 tandard Bore ize:.6" or.385" an be upplied with a Lap Joint Flange Plug and hain iameter Q " 7/8" Bore B.6".385" arbon teel (8) Inconel 6.5 P I P E I Z E P i a. R i a. " -/".35".9" " -7/8" FLNGE IZE N RT I N G None BORE IETER B.6".385" ", 5 lb. Lap Joint - arbon teel ", 3 lb. Lap Joint - arbon teel 3 - /", 5 lb. Lap Joint - arbon teel " 4" 7" " 3" 6" " 4 - /", 3 lb. Lap Joint - arbon teel 79