Heater Basics Issue 0214 (Prizes for Correct Answers)
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Today is Valentine’s Day, so first of all, I wish everyone a happy Valentine’s Day! Lovers eventually become a couple! 1. Standard GB151 specifies that when the heat exchange tube is of U-shaped type, its nominal length refers to ( ). A) Straight pipe section B) Welded section C) Entire pipe section 2. When carbon steel or low-alloy steel cold-drawn pipes are used as heat exchange tubes in GB151-1999, the precision grades for such heat exchange tubes are Grade I and Grade II; then ( ). A) Designate the heat exchanger as a Grade I or Grade II heat exchanger. B) There is no specific way to indicate it. C) Mark it as Grade I tube bank or Grade II tube bank. Correct answers: 1.A 2.C
1. According to the GB151 standard, when the heat exchange tube is a U-tube, its nominal length refers to (A). A) Straight pipe section B) Welded section C) Entire pipe section 2. When carbon steel or low-alloy steel cold-drawn tubes are used as heat exchange tubes in GB151-1999, the precision grades for such tubes are Grade I and Grade II; therefore, (C). A) Designate the heat exchanger as Grade I or Grade II heat exchanger. B) There is no specific way to indicate it. C) Mark it as Grade I tube bank or Grade II tube bank
1. Standard GB151 specifies that when the heat exchange tube is of U-shaped type, its nominal length refers to (A) the straight section). A) Straight section B) Welded section C) Entire tube section 2. In GB151-1999, when cold-drawn carbon steel or low-alloy steel tubes are used as heat exchange tubes, the precision levels for such tubes are Grade I and Grade II; therefore, (C) indicates a tube bank of Grade I or Grade II. A) Designate the heat exchanger as Grade I or Grade II heat exchanger. B) There is no specific method of indication. C) Mark it as Grade I tube bank or Grade II tube bank
1. According to the GB151 standard, when the heat exchange tube is a U-tube, its nominal length refers to (A). A) Straight pipe section B) Welded section C) Entire pipe section 2. When carbon steel or low-alloy steel cold-drawn tubes are used as heat exchange tubes in GB151-1999, the precision grades for such tubes are Grade I and Grade II; therefore, (C). A) Designate the heat exchanger as Grade I or Grade II heat exchanger. B) There is no specific method of indication. C) Mark it as Grade I tube bank or Grade II tube bank
1. According to the GB151 standard, when the heat exchange tube is a U-tube, its nominal length refers to (A). A) Straight pipe section B) Welded section C) Entire pipe section 2. When carbon steel or low-alloy steel cold-drawn tubes are used as heat exchange tubes in GB151-1999, the precision grades for such tubes are Grade I and Grade II; therefore, (C). A) Designate the heat exchanger as Grade I or Grade II heat exchanger. B) There is no specific method of indication. C) Mark it as Grade I tube bank or Grade II tube bank
1. According to the GB151 standard, when the heat exchange tube is a U-tube, its nominal length refers to (A). A) Straight pipe section B) Welded section C) Entire pipe section 2. When carbon steel or low-alloy steel cold-drawn tubes are used as heat exchange tubes in GB151-1999, the precision grades for such tubes are Grade I and Grade II; therefore, (C). A) Designate the heat exchanger as Grade I or Grade II heat exchanger. B) There is no specific way to indicate it. C) Mark it as Grade I tube bank or Grade II tube bank
1. According to the GB151 standard, when the heat exchange tube is a U-tube, its nominal length refers to (A). 2. In GB151-1999, when cold-drawn carbon steel and low-alloy steel tubes are used as heat exchange tubes, the precision grades for such tubes are Grade I and Grade II; then (C).
1. (A). 2. (C) .
1. According to the GB151 standard, when the heat exchange tube is a U-tube, its nominal length refers to (A). A) Straight pipe section B) Welded section C) Entire pipe section 2. When carbon steel or low-alloy steel cold-drawn tubes are used as heat exchange tubes in GB151-1999, the precision grades for such tubes are Grade I and Grade II; therefore, (C). A) Designate the heat exchanger as Grade I or Grade II heat exchanger. B) There is no specific method of indication. C) Mark it as Grade I tube bank or Grade II tube bank
1. According to the GB151 standard, when the heat exchange tube is a U-tube, its nominal length refers to (A). A) Straight pipe section B) Welded section C) Entire pipe section 2. When carbon steel or low-alloy steel cold-drawn tubes are used as heat exchange tubes in GB151-1999, the precision grades for such tubes are Grade I and Grade II; therefore, (C). A) Designate the heat exchanger as Grade I or Grade II heat exchanger. B) There is no specific way to indicate it. C) Mark it as Grade I tube bank or Grade II tube bank
My answer: 1. A 2. C
1.A Straight pipe section 2.CⅠ,Ⅱ Pipe bundles
1. According to the GB151 standard, when the heat exchange tube is a U-tube, its nominal length refers to (A). A) Straight pipe section B) Welded section C) Entire pipe section 2. When carbon steel or low-alloy steel cold-drawn pipes are used as heat exchange tubes in GB151-1999, the precision grades for such tubes are Grade I and Grade II; therefore, (C). A) Designate the heat exchanger as Grade I or Grade II heat exchanger. B) There is no specific method of indication. C) Mark it as Grade I tube bank or Grade II tube bank
1. Standard GB151 specifies that when the heat exchange tube is a U-tube, its nominal length refers to (A). A) Straight pipe section 2. When carbon steel or low-alloy steel cold-drawn tubes are used as heat exchange tubes in GB151-1999, the precision grades for such heat exchange tubes are Grade I and Grade II; therefore, (C). C) Marked as Grade I tube bank or Grade II tube bank
1. According to the GB151 standard, when the heat exchange tube is a U-tube, its nominal length refers to (A). A) Straight pipe section B) Welded section C) Entire pipe section 2. When carbon steel or low-alloy steel cold-drawn tubes are used as heat exchange tubes in GB151-1999, the precision grades for such tubes are Grade I and Grade II; therefore, (C). A) Designate the heat exchanger as Grade I or Grade II heat exchanger. B) There is no specific way to indicate it. C) Mark it as Grade I tube bank or Grade II tube bank