diff --git a/spring_online_calculator/src/main/java/labWork/premium_store/model/Client.java b/spring_online_calculator/src/main/java/labWork/premium_store/model/Client.java
index de82941..c2aeda0 100644
--- a/spring_online_calculator/src/main/java/labWork/premium_store/model/Client.java
+++ b/spring_online_calculator/src/main/java/labWork/premium_store/model/Client.java
@@ -10,11 +10,15 @@ public class Client {
     @Id
     @GeneratedValue(strategy = GenerationType.AUTO)
     private Long id;
+
     @Column(nullable = false, length = 255)
     private String nickName;
+
     @Column(nullable = false, length = 255)
     private String email;
+
     private Integer balance;
+
     @ManyToMany(mappedBy = "clients")
     private List<Tank> tanks;
 
diff --git a/spring_online_calculator/src/main/java/labWork/premium_store/model/Level.java b/spring_online_calculator/src/main/java/labWork/premium_store/model/Level.java
index 2b11cf2..1e8ba6f 100644
--- a/spring_online_calculator/src/main/java/labWork/premium_store/model/Level.java
+++ b/spring_online_calculator/src/main/java/labWork/premium_store/model/Level.java
@@ -8,6 +8,7 @@ public class Level {
     @Id
     @GeneratedValue(strategy = GenerationType.AUTO)
     private Long id;
+
     @Column(nullable = false)
     private int level;
 
diff --git a/spring_online_calculator/src/main/java/labWork/premium_store/model/Nation.java b/spring_online_calculator/src/main/java/labWork/premium_store/model/Nation.java
index 2b2b19d..3ba19eb 100644
--- a/spring_online_calculator/src/main/java/labWork/premium_store/model/Nation.java
+++ b/spring_online_calculator/src/main/java/labWork/premium_store/model/Nation.java
@@ -8,6 +8,7 @@ public class Nation {
     @Id
     @GeneratedValue(strategy = GenerationType.AUTO)
     private Long id;
+
     @Column(nullable = false)
     private String nation;
 
diff --git a/spring_online_calculator/src/main/java/labWork/premium_store/model/Tank.java b/spring_online_calculator/src/main/java/labWork/premium_store/model/Tank.java
index f223c6f..4dd0e4d 100644
--- a/spring_online_calculator/src/main/java/labWork/premium_store/model/Tank.java
+++ b/spring_online_calculator/src/main/java/labWork/premium_store/model/Tank.java
@@ -35,8 +35,10 @@ public class Tank {
     public Tank() {
     }
 
-    public Tank(String name, int cost) {
+    public Tank(String name, Nation nation, Level level, int cost) {
         this.name = name;
+        this.nation = nation;
+        this.level = level;
         this.cost = cost;
     }
 
diff --git a/spring_online_calculator/src/main/java/labWork/premium_store/service/ClientService.java b/spring_online_calculator/src/main/java/labWork/premium_store/service/ClientService.java
index 87a7994..5f688ae 100644
--- a/spring_online_calculator/src/main/java/labWork/premium_store/service/ClientService.java
+++ b/spring_online_calculator/src/main/java/labWork/premium_store/service/ClientService.java
@@ -46,17 +46,28 @@ public class ClientService {
     }
 
     @Transactional
-    public Client updateClient(Long id, String newNickName, String newEmail, Integer newBallance, List<Tank> newTanks) {
-        if (!StringUtils.hasText(newNickName) || !StringUtils.hasText(newEmail)) {
-            throw new IllegalArgumentException("NickName or newEmail is zero or empty");
+    public Client updateClient(Long id, String newNickName, String newEmail, Integer newBalance, List<Tank> newTanks) {
+        if (id <= 0) {
+            throw new IllegalArgumentException("Invalid id");
         }
 
         final Client currentClient = findClient(id);
 
-        currentClient.setNickName(newNickName);
-        currentClient.setNickName(newNickName);
-        currentClient.setBalance(newBallance);
-        currentClient.setTanks(newTanks);
+        if (StringUtils.hasText(newNickName)){
+            currentClient.setNickName(newNickName);
+        }
+
+        if(StringUtils.hasText(newEmail)){
+            currentClient.setEmail(newEmail);
+        }
+
+        if(newBalance != null){
+            currentClient.setBalance(newBalance);
+        }
+
+        if(newTanks != null){
+            currentClient.setTanks(newTanks);
+        }
 
         return em.merge(currentClient);
     }
@@ -69,6 +80,7 @@ public class ClientService {
         return currentClient;
     }
 
+    //прямой sql-запрос на удаление всех записей в таблице
     @Transactional
     public void deleteAllClients() {
         em.createQuery("Delete from Client").executeUpdate();
diff --git a/spring_online_calculator/src/main/java/labWork/premium_store/service/TankService.java b/spring_online_calculator/src/main/java/labWork/premium_store/service/TankService.java
new file mode 100644
index 0000000..02a959f
--- /dev/null
+++ b/spring_online_calculator/src/main/java/labWork/premium_store/service/TankService.java
@@ -0,0 +1,95 @@
+package labWork.premium_store.service;
+
+import labWork.premium_store.model.Client;
+import labWork.premium_store.model.Level;
+import labWork.premium_store.model.Nation;
+import labWork.premium_store.model.Tank;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.util.StringUtils;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityNotFoundException;
+import javax.persistence.PersistenceContext;
+import java.util.List;
+
+@Service
+public class TankService {
+    @PersistenceContext
+    private EntityManager em;
+
+    @Transactional
+    public Tank addTank(String newName, Nation newNation, Level newLevel, int newCost) {
+        if (!StringUtils.hasText(newName) || newNation == null || newLevel == null || newCost <= 0) {
+            throw new IllegalArgumentException("New Name, new Nation, new Level or newCost is zero or empty");
+        }
+
+        final Tank tank = new Tank(newName, newNation, newLevel, newCost);
+        em.persist(tank);
+
+        return tank;
+    }
+
+    @Transactional(readOnly = true)
+    public Tank findTank(Long id) {
+        final Tank Tank = em.find(Tank.class, id);
+
+        if (Tank == null) {
+            throw new EntityNotFoundException(String.format("Tank with id [%s] is not found", id));
+        }
+
+        return Tank;
+    }
+
+    @Transactional(readOnly = true)
+    public List<Tank> findAllTanks() {
+        return em.createQuery("select t from Tank t", Tank.class)
+                .getResultList();
+    }
+
+    @Transactional
+    public Tank updateTank(Long id, String newName, Nation newNation,
+                           Level newLevel, int newCost, List<Client> newClients) {
+        if (id <= 0) {
+            throw new IllegalArgumentException("Invalid id");
+        }
+
+        final Tank currentTank = findTank(id);
+
+        if (StringUtils.hasText(newName)){
+            currentTank.setName(newName);
+        }
+
+        if(newNation != null){
+            currentTank.setNation(newNation);
+        }
+
+        if(newLevel != null){
+            currentTank.setLevel(newLevel);
+        }
+
+        if(newCost > 0){
+            currentTank.setCost(newCost);
+        }
+
+        if(newClients != null){
+            currentTank.setClients(newClients);
+        }
+
+        return em.merge(currentTank);
+    }
+
+    @Transactional
+    public Tank deleteTank(Long id) {
+        final Tank currentTank = findTank(id);
+        em.remove(currentTank);
+
+        return currentTank;
+    }
+
+    //прямой sql-запрос на удаление всех записей в таблице
+    @Transactional
+    public void deleteAllTanks() {
+        em.createQuery("Delete from Tank").executeUpdate();
+    }
+}